forked from mirrors/gecko-dev
2511 lines
76 KiB
C++
2511 lines
76 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebGLContext.h"
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#include <algorithm>
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#include <bitset>
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#include <queue>
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#include <regex>
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#include "AccessCheck.h"
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#include "CompositableHost.h"
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#include "gfxConfig.h"
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#include "gfxContext.h"
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#include "gfxCrashReporterUtils.h"
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#include "gfxEnv.h"
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#include "gfxPattern.h"
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#include "MozFramebuffer.h"
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#include "GLBlitHelper.h"
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#include "GLContext.h"
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#include "GLContextProvider.h"
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#include "GLReadTexImageHelper.h"
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#include "GLScreenBuffer.h"
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#include "ImageContainer.h"
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#include "ImageEncoder.h"
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#include "Layers.h"
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#include "LayerUserData.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/Event.h"
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#include "mozilla/dom/HTMLVideoElement.h"
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#include "mozilla/dom/ImageData.h"
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#include "mozilla/dom/WebGLContextEvent.h"
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#include "mozilla/EnumeratedArrayCycleCollection.h"
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#include "mozilla/EnumeratedRange.h"
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#include "mozilla/gfx/gfxVars.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/ProcessPriorityManager.h"
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#include "mozilla/ResultVariant.h"
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#include "mozilla/ScopeExit.h"
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#include "mozilla/Services.h"
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#include "mozilla/StaticPrefs_webgl.h"
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#include "mozilla/SVGObserverUtils.h"
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#include "mozilla/Telemetry.h"
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#include "nsContentUtils.h"
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#include "nsDisplayList.h"
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#include "nsError.h"
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#include "nsIClassInfoImpl.h"
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#include "nsIWidget.h"
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#include "nsServiceManagerUtils.h"
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#include "SharedSurfaceGL.h"
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#include "prenv.h"
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#include "ScopedGLHelpers.h"
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#include "VRManagerChild.h"
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#include "mozilla/gfx/Swizzle.h"
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#include "mozilla/layers/BufferTexture.h"
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#include "mozilla/layers/RemoteTextureMap.h"
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#include "mozilla/layers/CompositorBridgeChild.h"
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#include "mozilla/layers/ImageBridgeChild.h"
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#include "mozilla/layers/TextureClientSharedSurface.h"
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#include "mozilla/layers/WebRenderUserData.h"
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#include "mozilla/layers/WebRenderCanvasRenderer.h"
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// Local
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#include "CanvasUtils.h"
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#include "ClientWebGLContext.h"
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#include "HostWebGLContext.h"
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#include "WebGLBuffer.h"
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#include "WebGLChild.h"
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#include "WebGLContextLossHandler.h"
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#include "WebGLContextUtils.h"
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#include "WebGLExtensions.h"
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#include "WebGLFormats.h"
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#include "WebGLFramebuffer.h"
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#include "WebGLMemoryTracker.h"
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#include "WebGLObjectModel.h"
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#include "WebGLParent.h"
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#include "WebGLProgram.h"
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#include "WebGLQuery.h"
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#include "WebGLSampler.h"
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#include "WebGLShader.h"
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#include "WebGLShaderValidator.h"
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#include "WebGLSync.h"
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#include "WebGLTransformFeedback.h"
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#include "WebGLValidateStrings.h"
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#include "WebGLVertexArray.h"
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#ifdef MOZ_WIDGET_COCOA
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# include "nsCocoaFeatures.h"
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#endif
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#ifdef XP_WIN
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# include "WGLLibrary.h"
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#endif
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// Generated
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#include "mozilla/dom/WebGLRenderingContextBinding.h"
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namespace mozilla {
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WebGLContextOptions::WebGLContextOptions() {
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// Set default alpha state based on preference.
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alpha = !StaticPrefs::webgl_default_no_alpha();
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antialias = StaticPrefs::webgl_default_antialias();
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}
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StaticMutex WebGLContext::sLruMutex;
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std::list<WebGLContext*> WebGLContext::sLru;
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WebGLContext::LruPosition::LruPosition() {
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StaticMutexAutoLock lock(sLruMutex);
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mItr = sLru.end();
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} // NOLINT
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WebGLContext::LruPosition::LruPosition(WebGLContext& context) {
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StaticMutexAutoLock lock(sLruMutex);
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mItr = sLru.insert(sLru.end(), &context);
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}
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void WebGLContext::LruPosition::AssignLocked(WebGLContext& aContext) {
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ResetLocked();
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mItr = sLru.insert(sLru.end(), &aContext);
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}
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void WebGLContext::LruPosition::ResetLocked() {
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const auto end = sLru.end();
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if (mItr != end) {
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sLru.erase(mItr);
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mItr = end;
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}
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}
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void WebGLContext::LruPosition::Reset() {
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StaticMutexAutoLock lock(sLruMutex);
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ResetLocked();
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}
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bool WebGLContext::LruPosition::IsInsertedLocked() const {
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return mItr != sLru.end();
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}
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WebGLContext::WebGLContext(HostWebGLContext& host,
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const webgl::InitContextDesc& desc)
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: gl(mGL_OnlyClearInDestroyResourcesAndContext), // const reference
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mHost(&host),
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mResistFingerprinting(desc.resistFingerprinting),
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mOptions(desc.options),
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mPrincipalKey(desc.principalKey),
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mPendingContextLoss(false),
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mMaxPerfWarnings(StaticPrefs::webgl_perf_max_warnings()),
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mMaxAcceptableFBStatusInvals(
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StaticPrefs::webgl_perf_max_acceptable_fb_status_invals()),
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mContextLossHandler(this),
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mMaxWarnings(StaticPrefs::webgl_max_warnings_per_context()),
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mAllowFBInvalidation(StaticPrefs::webgl_allow_fb_invalidation()),
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mMsaaSamples((uint8_t)StaticPrefs::webgl_msaa_samples()),
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mRequestedSize(desc.size) {
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host.mContext = this;
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const FuncScope funcScope(*this, "<Create>");
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}
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WebGLContext::~WebGLContext() { DestroyResourcesAndContext(); }
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void WebGLContext::DestroyResourcesAndContext() {
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if (mRemoteTextureOwner) {
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// Clean up any remote textures registered for framebuffer swap chains.
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mRemoteTextureOwner->UnregisterAllTextureOwners();
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mRemoteTextureOwner = nullptr;
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}
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if (!gl) return;
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mDefaultFB = nullptr;
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mResolvedDefaultFB = nullptr;
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mBound2DTextures.Clear();
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mBoundCubeMapTextures.Clear();
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mBound3DTextures.Clear();
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mBound2DArrayTextures.Clear();
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mBoundSamplers.Clear();
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mBoundArrayBuffer = nullptr;
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mBoundCopyReadBuffer = nullptr;
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mBoundCopyWriteBuffer = nullptr;
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mBoundPixelPackBuffer = nullptr;
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mBoundPixelUnpackBuffer = nullptr;
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mBoundTransformFeedbackBuffer = nullptr;
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mBoundUniformBuffer = nullptr;
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mCurrentProgram = nullptr;
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mActiveProgramLinkInfo = nullptr;
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mBoundDrawFramebuffer = nullptr;
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mBoundReadFramebuffer = nullptr;
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mBoundVertexArray = nullptr;
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mDefaultVertexArray = nullptr;
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mBoundTransformFeedback = nullptr;
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mDefaultTransformFeedback = nullptr;
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mQuerySlot_SamplesPassed = nullptr;
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mQuerySlot_TFPrimsWritten = nullptr;
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mQuerySlot_TimeElapsed = nullptr;
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mIndexedUniformBufferBindings.clear();
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//////
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if (mEmptyTFO) {
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gl->fDeleteTransformFeedbacks(1, &mEmptyTFO);
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mEmptyTFO = 0;
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}
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//////
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if (mFakeVertexAttrib0BufferObject) {
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gl->fDeleteBuffers(1, &mFakeVertexAttrib0BufferObject);
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mFakeVertexAttrib0BufferObject = 0;
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}
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// disable all extensions except "WEBGL_lose_context". see bug #927969
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// spec: http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
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for (size_t i = 0; i < size_t(WebGLExtensionID::Max); ++i) {
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WebGLExtensionID extension = WebGLExtensionID(i);
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if (extension == WebGLExtensionID::WEBGL_lose_context) continue;
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mExtensions[extension] = nullptr;
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}
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// We just got rid of everything, so the context had better
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// have been going away.
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if (gl::GLContext::ShouldSpew()) {
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printf_stderr("--- WebGL context destroyed: %p\n", gl.get());
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}
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MOZ_ASSERT(gl);
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gl->MarkDestroyed();
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mGL_OnlyClearInDestroyResourcesAndContext = nullptr;
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MOZ_ASSERT(!gl);
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}
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void ClientWebGLContext::MarkCanvasDirty() {
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if (!mCanvasElement && !mOffscreenCanvas) return;
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mFrameCaptureState = FrameCaptureState::DIRTY;
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if (mIsCanvasDirty) return;
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mIsCanvasDirty = true;
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if (mCanvasElement) {
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SVGObserverUtils::InvalidateDirectRenderingObservers(mCanvasElement);
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mCanvasElement->InvalidateCanvasContent(nullptr);
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} else if (mOffscreenCanvas) {
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mOffscreenCanvas->QueueCommitToCompositor();
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}
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}
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void WebGLContext::OnMemoryPressure() {
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bool shouldLoseContext = mLoseContextOnMemoryPressure;
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if (!mCanLoseContextInForeground &&
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ProcessPriorityManager::CurrentProcessIsForeground()) {
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shouldLoseContext = false;
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}
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if (shouldLoseContext) LoseContext();
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}
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// --
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bool WebGLContext::CreateAndInitGL(
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bool forceEnabled, std::vector<FailureReason>* const out_failReasons) {
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const FuncScope funcScope(*this, "<Create>");
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// WebGL2 is separately blocked:
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if (IsWebGL2() && !forceEnabled) {
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FailureReason reason;
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if (!gfx::gfxVars::AllowWebgl2()) {
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reason.info =
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"AllowWebgl2:false restricts context creation on this system.";
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out_failReasons->push_back(reason);
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GenerateWarning("%s", reason.info.BeginReading());
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return false;
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}
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}
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gl::CreateContextFlags flags = (gl::CreateContextFlags::NO_VALIDATION |
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gl::CreateContextFlags::PREFER_ROBUSTNESS);
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bool tryNativeGL = true;
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bool tryANGLE = false;
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if (forceEnabled) {
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flags |= gl::CreateContextFlags::FORCE_ENABLE_HARDWARE;
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}
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if (StaticPrefs::webgl_cgl_multithreaded()) {
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flags |= gl::CreateContextFlags::PREFER_MULTITHREADED;
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}
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if (IsWebGL2()) {
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flags |= gl::CreateContextFlags::PREFER_ES3;
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} else {
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// Request and prefer ES2 context for WebGL1.
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flags |= gl::CreateContextFlags::PREFER_EXACT_VERSION;
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if (!StaticPrefs::webgl_1_allow_core_profiles()) {
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flags |= gl::CreateContextFlags::REQUIRE_COMPAT_PROFILE;
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}
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}
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{
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auto powerPref = mOptions.powerPreference;
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// If "Use hardware acceleration when available" option is disabled:
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if (!gfx::gfxConfig::IsEnabled(gfx::Feature::HW_COMPOSITING)) {
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powerPref = dom::WebGLPowerPreference::Low_power;
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}
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const auto overrideVal = StaticPrefs::webgl_power_preference_override();
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if (overrideVal > 0) {
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powerPref = dom::WebGLPowerPreference::High_performance;
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} else if (overrideVal < 0) {
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powerPref = dom::WebGLPowerPreference::Low_power;
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}
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if (powerPref == dom::WebGLPowerPreference::High_performance) {
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flags |= gl::CreateContextFlags::HIGH_POWER;
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}
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}
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if (!gfx::gfxVars::WebglAllowCoreProfile()) {
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flags |= gl::CreateContextFlags::REQUIRE_COMPAT_PROFILE;
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}
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// --
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const bool useEGL = PR_GetEnv("MOZ_WEBGL_FORCE_EGL");
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#ifdef XP_WIN
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tryNativeGL = false;
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tryANGLE = true;
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if (StaticPrefs::webgl_disable_wgl()) {
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tryNativeGL = false;
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}
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if (StaticPrefs::webgl_disable_angle() ||
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PR_GetEnv("MOZ_WEBGL_FORCE_OPENGL") || useEGL) {
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tryNativeGL = true;
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tryANGLE = false;
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}
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#endif
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if (tryNativeGL && !forceEnabled) {
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FailureReason reason;
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if (!gfx::gfxVars::WebglAllowWindowsNativeGl()) {
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reason.info =
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"WebglAllowWindowsNativeGl:false restricts context creation on this "
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"system.";
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out_failReasons->push_back(reason);
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GenerateWarning("%s", reason.info.BeginReading());
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tryNativeGL = false;
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}
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}
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// --
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using fnCreateT = decltype(gl::GLContextProviderEGL::CreateHeadless);
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const auto fnCreate = [&](fnCreateT* const pfnCreate,
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const char* const info) {
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nsCString failureId;
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const RefPtr<gl::GLContext> gl = pfnCreate({flags}, &failureId);
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if (!gl) {
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out_failReasons->push_back(WebGLContext::FailureReason(failureId, info));
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}
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return gl;
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};
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const auto newGL = [&]() -> RefPtr<gl::GLContext> {
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if (tryNativeGL) {
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if (useEGL)
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return fnCreate(&gl::GLContextProviderEGL::CreateHeadless, "useEGL");
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const auto ret =
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fnCreate(&gl::GLContextProvider::CreateHeadless, "tryNativeGL");
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if (ret) return ret;
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}
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if (tryANGLE) {
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return fnCreate(&gl::GLContextProviderEGL::CreateHeadless, "tryANGLE");
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}
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return nullptr;
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}();
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if (!newGL) {
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out_failReasons->push_back(
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FailureReason("FEATURE_FAILURE_WEBGL_EXHAUSTED_DRIVERS",
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"Exhausted GL driver options."));
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return false;
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}
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// --
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FailureReason reason;
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mGL_OnlyClearInDestroyResourcesAndContext = newGL;
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MOZ_RELEASE_ASSERT(gl);
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if (!InitAndValidateGL(&reason)) {
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DestroyResourcesAndContext();
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MOZ_RELEASE_ASSERT(!gl);
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// The fail reason here should be specific enough for now.
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out_failReasons->push_back(reason);
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return false;
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}
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const auto val = StaticPrefs::webgl_debug_incomplete_tex_color();
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if (val) {
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mIncompleteTexOverride.reset(new gl::Texture(*gl));
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const gl::ScopedBindTexture autoBind(gl, mIncompleteTexOverride->name);
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const auto heapVal = std::make_unique<uint32_t>(val);
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gl->fTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA, 1, 1, 0,
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LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE, heapVal.get());
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}
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return true;
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}
|
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|
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// Fallback for resizes:
|
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|
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bool WebGLContext::EnsureDefaultFB() {
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if (mDefaultFB) {
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MOZ_ASSERT(*uvec2::FromSize(mDefaultFB->mSize) == mRequestedSize);
|
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return true;
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}
|
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const bool depthStencil = mOptions.depth || mOptions.stencil;
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auto attemptSize = gfx::IntSize{mRequestedSize.x, mRequestedSize.y};
|
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|
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while (attemptSize.width || attemptSize.height) {
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attemptSize.width = std::max(attemptSize.width, 1);
|
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attemptSize.height = std::max(attemptSize.height, 1);
|
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|
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[&]() {
|
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if (mOptions.antialias) {
|
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MOZ_ASSERT(!mDefaultFB);
|
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mDefaultFB = gl::MozFramebuffer::Create(gl, attemptSize, mMsaaSamples,
|
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depthStencil);
|
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if (mDefaultFB) return;
|
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if (mOptionsFrozen) return;
|
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}
|
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|
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MOZ_ASSERT(!mDefaultFB);
|
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mDefaultFB = gl::MozFramebuffer::Create(gl, attemptSize, 0, depthStencil);
|
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}();
|
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|
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if (mDefaultFB) break;
|
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|
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attemptSize.width /= 2;
|
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attemptSize.height /= 2;
|
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}
|
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|
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if (!mDefaultFB) {
|
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GenerateWarning("Backbuffer resize failed. Losing context.");
|
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LoseContext();
|
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return false;
|
||
}
|
||
|
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mDefaultFB_IsInvalid = true;
|
||
|
||
const auto actualSize = *uvec2::FromSize(mDefaultFB->mSize);
|
||
if (actualSize != mRequestedSize) {
|
||
GenerateWarning(
|
||
"Requested size %ux%u was too large, but resize"
|
||
" to %ux%u succeeded.",
|
||
mRequestedSize.x, mRequestedSize.y, actualSize.x, actualSize.y);
|
||
}
|
||
mRequestedSize = actualSize;
|
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return true;
|
||
}
|
||
|
||
void WebGLContext::Resize(uvec2 requestedSize) {
|
||
// Zero-sized surfaces can cause problems.
|
||
if (!requestedSize.x) {
|
||
requestedSize.x = 1;
|
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}
|
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if (!requestedSize.y) {
|
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requestedSize.y = 1;
|
||
}
|
||
|
||
// Kill our current default fb(s), for later lazy allocation.
|
||
mRequestedSize = requestedSize;
|
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mDefaultFB = nullptr;
|
||
mResetLayer = true; // New size means new Layer.
|
||
}
|
||
|
||
UniquePtr<webgl::FormatUsageAuthority> WebGLContext::CreateFormatUsage(
|
||
gl::GLContext* gl) const {
|
||
return webgl::FormatUsageAuthority::CreateForWebGL1(gl);
|
||
}
|
||
|
||
/*static*/
|
||
RefPtr<WebGLContext> WebGLContext::Create(HostWebGLContext& host,
|
||
const webgl::InitContextDesc& desc,
|
||
webgl::InitContextResult* const out) {
|
||
AUTO_PROFILER_LABEL("WebGLContext::Create", GRAPHICS);
|
||
nsCString failureId = "FEATURE_FAILURE_WEBGL_UNKOWN"_ns;
|
||
const bool forceEnabled = StaticPrefs::webgl_force_enabled();
|
||
ScopedGfxFeatureReporter reporter("WebGL", forceEnabled);
|
||
|
||
auto res = [&]() -> Result<RefPtr<WebGLContext>, std::string> {
|
||
bool disabled = StaticPrefs::webgl_disabled();
|
||
|
||
// TODO: When we have software webgl support we should use that instead.
|
||
disabled |= gfxPlatform::InSafeMode();
|
||
|
||
if (disabled) {
|
||
if (gfxPlatform::InSafeMode()) {
|
||
failureId = "FEATURE_FAILURE_WEBGL_SAFEMODE"_ns;
|
||
} else {
|
||
failureId = "FEATURE_FAILURE_WEBGL_DISABLED"_ns;
|
||
}
|
||
return Err("WebGL is currently disabled.");
|
||
}
|
||
|
||
// Alright, now let's start trying.
|
||
|
||
RefPtr<WebGLContext> webgl;
|
||
if (desc.isWebgl2) {
|
||
webgl = new WebGL2Context(host, desc);
|
||
} else {
|
||
webgl = new WebGLContext(host, desc);
|
||
}
|
||
|
||
MOZ_ASSERT(!webgl->gl);
|
||
std::vector<FailureReason> failReasons;
|
||
if (!webgl->CreateAndInitGL(forceEnabled, &failReasons)) {
|
||
nsCString text("WebGL creation failed: ");
|
||
for (const auto& cur : failReasons) {
|
||
// Don't try to accumulate using an empty key if |cur.key| is empty.
|
||
if (cur.key.IsEmpty()) {
|
||
Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID,
|
||
"FEATURE_FAILURE_REASON_UNKNOWN"_ns);
|
||
} else {
|
||
Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID, cur.key);
|
||
}
|
||
|
||
const auto str = nsPrintfCString("\n* %s (%s)", cur.info.BeginReading(),
|
||
cur.key.BeginReading());
|
||
text.Append(str);
|
||
}
|
||
failureId = "FEATURE_FAILURE_REASON"_ns;
|
||
return Err(text.BeginReading());
|
||
}
|
||
MOZ_ASSERT(webgl->gl);
|
||
|
||
if (desc.options.failIfMajorPerformanceCaveat) {
|
||
if (webgl->gl->IsWARP()) {
|
||
failureId = "FEATURE_FAILURE_WEBGL_PERF_WARP"_ns;
|
||
return Err(
|
||
"failIfMajorPerformanceCaveat: Driver is not"
|
||
" hardware-accelerated.");
|
||
}
|
||
|
||
#ifdef XP_WIN
|
||
if (webgl->gl->GetContextType() == gl::GLContextType::WGL &&
|
||
!gl::sWGLLib.HasDXInterop2()) {
|
||
failureId = "FEATURE_FAILURE_WEBGL_DXGL_INTEROP2"_ns;
|
||
return Err("failIfMajorPerformanceCaveat: WGL without DXGLInterop2.");
|
||
}
|
||
#endif
|
||
}
|
||
|
||
const FuncScope funcScope(*webgl, "getContext/restoreContext");
|
||
|
||
MOZ_ASSERT(!webgl->mDefaultFB);
|
||
if (!webgl->EnsureDefaultFB()) {
|
||
MOZ_ASSERT(!webgl->mDefaultFB);
|
||
MOZ_ASSERT(webgl->IsContextLost());
|
||
failureId = "FEATURE_FAILURE_WEBGL_BACKBUFFER"_ns;
|
||
return Err("Initializing WebGL backbuffer failed.");
|
||
}
|
||
|
||
return webgl;
|
||
}();
|
||
if (res.isOk()) {
|
||
failureId = "SUCCESS"_ns;
|
||
}
|
||
Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_FAILURE_ID, failureId);
|
||
|
||
if (!res.isOk()) {
|
||
out->error = res.unwrapErr();
|
||
return nullptr;
|
||
}
|
||
const auto webgl = res.unwrap();
|
||
|
||
// Update our internal stuff:
|
||
webgl->FinishInit();
|
||
|
||
reporter.SetSuccessful();
|
||
if (gl::GLContext::ShouldSpew()) {
|
||
printf_stderr("--- WebGL context created: %p\n", webgl.get());
|
||
}
|
||
|
||
// -
|
||
|
||
const auto UploadableSdTypes = [&]() {
|
||
webgl::EnumMask<layers::SurfaceDescriptor::Type> types;
|
||
types[layers::SurfaceDescriptor::TSurfaceDescriptorBuffer] = true;
|
||
if (webgl->gl->IsANGLE()) {
|
||
types[layers::SurfaceDescriptor::TSurfaceDescriptorD3D10] = true;
|
||
types[layers::SurfaceDescriptor::TSurfaceDescriptorDXGIYCbCr] = true;
|
||
}
|
||
if (kIsMacOS) {
|
||
types[layers::SurfaceDescriptor::TSurfaceDescriptorMacIOSurface] = true;
|
||
}
|
||
if (kIsAndroid) {
|
||
types[layers::SurfaceDescriptor::TSurfaceTextureDescriptor] = true;
|
||
}
|
||
return types;
|
||
};
|
||
|
||
// -
|
||
|
||
out->options = webgl->mOptions;
|
||
out->limits = *webgl->mLimits;
|
||
out->uploadableSdTypes = UploadableSdTypes();
|
||
|
||
return webgl;
|
||
}
|
||
|
||
void WebGLContext::FinishInit() {
|
||
mOptions.antialias &= bool(mDefaultFB->mSamples);
|
||
|
||
if (!mOptions.alpha) {
|
||
// We always have alpha.
|
||
mNeedsFakeNoAlpha = true;
|
||
}
|
||
|
||
if (mOptions.depth || mOptions.stencil) {
|
||
// We always have depth+stencil if we have either.
|
||
if (!mOptions.depth) {
|
||
mNeedsFakeNoDepth = true;
|
||
}
|
||
if (!mOptions.stencil) {
|
||
mNeedsFakeNoStencil = true;
|
||
}
|
||
}
|
||
|
||
mNeedsFakeNoStencil_UserFBs = false;
|
||
#ifdef MOZ_WIDGET_COCOA
|
||
if (!nsCocoaFeatures::IsAtLeastVersion(10, 12) &&
|
||
gl->Vendor() == gl::GLVendor::Intel) {
|
||
mNeedsFakeNoStencil_UserFBs = true;
|
||
}
|
||
#endif
|
||
|
||
mResetLayer = true;
|
||
mOptionsFrozen = true;
|
||
|
||
//////
|
||
// Initial setup.
|
||
|
||
gl->mImplicitMakeCurrent = true;
|
||
gl->mElideDuplicateBindFramebuffers = true;
|
||
|
||
const auto& size = mDefaultFB->mSize;
|
||
|
||
mViewportX = mViewportY = 0;
|
||
mViewportWidth = size.width;
|
||
mViewportHeight = size.height;
|
||
gl->fViewport(mViewportX, mViewportY, mViewportWidth, mViewportHeight);
|
||
|
||
mScissorRect = {0, 0, size.width, size.height};
|
||
mScissorRect.Apply(*gl);
|
||
|
||
//////
|
||
// Check everything
|
||
|
||
AssertCachedBindings();
|
||
AssertCachedGlobalState();
|
||
|
||
mShouldPresent = true;
|
||
|
||
//////
|
||
|
||
gl->ResetSyncCallCount("WebGLContext Initialization");
|
||
LoseLruContextIfLimitExceeded();
|
||
}
|
||
|
||
void WebGLContext::SetCompositableHost(
|
||
RefPtr<layers::CompositableHost>& aCompositableHost) {
|
||
mCompositableHost = aCompositableHost;
|
||
}
|
||
|
||
void WebGLContext::BumpLruLocked() {
|
||
if (!mIsContextLost && !mPendingContextLoss) {
|
||
mLruPosition.AssignLocked(*this);
|
||
} else {
|
||
MOZ_ASSERT(!mLruPosition.IsInsertedLocked());
|
||
}
|
||
}
|
||
|
||
void WebGLContext::BumpLru() {
|
||
StaticMutexAutoLock lock(sLruMutex);
|
||
BumpLruLocked();
|
||
}
|
||
|
||
void WebGLContext::LoseLruContextIfLimitExceeded() {
|
||
StaticMutexAutoLock lock(sLruMutex);
|
||
|
||
const auto maxContexts = std::max(1u, StaticPrefs::webgl_max_contexts());
|
||
const auto maxContextsPerPrincipal =
|
||
std::max(1u, StaticPrefs::webgl_max_contexts_per_principal());
|
||
|
||
// it's important to update the index on a new context before losing old
|
||
// contexts, otherwise new unused contexts would all have index 0 and we
|
||
// couldn't distinguish older ones when choosing which one to lose first.
|
||
BumpLruLocked();
|
||
|
||
{
|
||
size_t forPrincipal = 0;
|
||
for (const auto& context : sLru) {
|
||
if (context->mPrincipalKey == mPrincipalKey) {
|
||
forPrincipal += 1;
|
||
}
|
||
}
|
||
|
||
while (forPrincipal > maxContextsPerPrincipal) {
|
||
const auto text = nsPrintfCString(
|
||
"Exceeded %u live WebGL contexts for this principal, losing the "
|
||
"least recently used one.",
|
||
maxContextsPerPrincipal);
|
||
mHost->JsWarning(ToString(text));
|
||
|
||
for (const auto& context : sLru) {
|
||
if (context->mPrincipalKey == mPrincipalKey) {
|
||
MOZ_ASSERT(context != this);
|
||
context->LoseContextLruLocked(webgl::ContextLossReason::None);
|
||
forPrincipal -= 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
auto total = sLru.size();
|
||
while (total > maxContexts) {
|
||
const auto text = nsPrintfCString(
|
||
"Exceeded %u live WebGL contexts, losing the least "
|
||
"recently used one.",
|
||
maxContexts);
|
||
mHost->JsWarning(ToString(text));
|
||
|
||
const auto& context = sLru.front();
|
||
MOZ_ASSERT(context != this);
|
||
context->LoseContextLruLocked(webgl::ContextLossReason::None);
|
||
total -= 1;
|
||
}
|
||
}
|
||
|
||
// -
|
||
|
||
namespace webgl {
|
||
|
||
ScopedPrepForResourceClear::ScopedPrepForResourceClear(
|
||
const WebGLContext& webgl_)
|
||
: webgl(webgl_) {
|
||
const auto& gl = webgl.gl;
|
||
|
||
if (webgl.mScissorTestEnabled) {
|
||
gl->fDisable(LOCAL_GL_SCISSOR_TEST);
|
||
}
|
||
if (webgl.mRasterizerDiscardEnabled) {
|
||
gl->fDisable(LOCAL_GL_RASTERIZER_DISCARD);
|
||
}
|
||
|
||
// "The clear operation always uses the front stencil write mask
|
||
// when clearing the stencil buffer."
|
||
webgl.DoColorMask(Some(0), 0b1111);
|
||
gl->fDepthMask(true);
|
||
gl->fStencilMaskSeparate(LOCAL_GL_FRONT, 0xffffffff);
|
||
|
||
gl->fClearColor(0.0f, 0.0f, 0.0f, 0.0f);
|
||
gl->fClearDepth(1.0f); // Depth formats are always cleared to 1.0f, not 0.0f.
|
||
gl->fClearStencil(0);
|
||
}
|
||
|
||
ScopedPrepForResourceClear::~ScopedPrepForResourceClear() {
|
||
const auto& gl = webgl.gl;
|
||
|
||
if (webgl.mScissorTestEnabled) {
|
||
gl->fEnable(LOCAL_GL_SCISSOR_TEST);
|
||
}
|
||
if (webgl.mRasterizerDiscardEnabled) {
|
||
gl->fEnable(LOCAL_GL_RASTERIZER_DISCARD);
|
||
}
|
||
|
||
webgl.DoColorMask(Some(0), webgl.mColorWriteMask0);
|
||
gl->fDepthMask(webgl.mDepthWriteMask);
|
||
gl->fStencilMaskSeparate(LOCAL_GL_FRONT, webgl.mStencilWriteMaskFront);
|
||
|
||
gl->fClearColor(webgl.mColorClearValue[0], webgl.mColorClearValue[1],
|
||
webgl.mColorClearValue[2], webgl.mColorClearValue[3]);
|
||
gl->fClearDepth(webgl.mDepthClearValue);
|
||
gl->fClearStencil(webgl.mStencilClearValue);
|
||
}
|
||
|
||
} // namespace webgl
|
||
|
||
// -
|
||
|
||
void WebGLContext::OnEndOfFrame() {
|
||
if (StaticPrefs::webgl_perf_spew_frame_allocs()) {
|
||
GeneratePerfWarning("[webgl.perf.spew-frame-allocs] %" PRIu64
|
||
" data allocations this frame.",
|
||
mDataAllocGLCallCount);
|
||
}
|
||
mDataAllocGLCallCount = 0;
|
||
gl->ResetSyncCallCount("WebGLContext PresentScreenBuffer");
|
||
|
||
mDrawCallsSinceLastFlush = 0;
|
||
|
||
BumpLru();
|
||
}
|
||
|
||
void WebGLContext::BlitBackbufferToCurDriverFB(
|
||
WebGLFramebuffer* const srcAsWebglFb,
|
||
const gl::MozFramebuffer* const srcAsMozFb, bool srcIsBGRA) const {
|
||
// BlitFramebuffer ignores ColorMask().
|
||
|
||
if (mScissorTestEnabled) {
|
||
gl->fDisable(LOCAL_GL_SCISSOR_TEST);
|
||
}
|
||
|
||
[&]() {
|
||
// If a MozFramebuffer is supplied, ensure that a WebGLFramebuffer is not
|
||
// used since it might not have completeness info, while the MozFramebuffer
|
||
// can still supply the needed information.
|
||
MOZ_ASSERT(!(srcAsMozFb && srcAsWebglFb));
|
||
const auto* mozFb = srcAsMozFb ? srcAsMozFb : mDefaultFB.get();
|
||
GLuint fbo = 0;
|
||
gfx::IntSize size;
|
||
if (srcAsWebglFb) {
|
||
fbo = srcAsWebglFb->mGLName;
|
||
const auto* info = srcAsWebglFb->GetCompletenessInfo();
|
||
MOZ_ASSERT(info);
|
||
size = gfx::IntSize(info->width, info->height);
|
||
} else {
|
||
fbo = mozFb->mFB;
|
||
size = mozFb->mSize;
|
||
}
|
||
|
||
// If no format conversion is necessary, then attempt to directly blit
|
||
// between framebuffers. Otherwise, if we need to convert to RGBA from
|
||
// the source format, then we will need to use the texture blit path
|
||
// below.
|
||
if (!srcIsBGRA) {
|
||
if (gl->IsSupported(gl::GLFeature::framebuffer_blit)) {
|
||
gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, fbo);
|
||
gl->fBlitFramebuffer(0, 0, size.width, size.height, 0, 0, size.width,
|
||
size.height, LOCAL_GL_COLOR_BUFFER_BIT,
|
||
LOCAL_GL_NEAREST);
|
||
return;
|
||
}
|
||
if (mDefaultFB->mSamples &&
|
||
gl->IsExtensionSupported(
|
||
gl::GLContext::APPLE_framebuffer_multisample)) {
|
||
gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, fbo);
|
||
gl->fResolveMultisampleFramebufferAPPLE();
|
||
return;
|
||
}
|
||
}
|
||
|
||
GLuint colorTex = 0;
|
||
if (srcAsWebglFb) {
|
||
const auto& attach = srcAsWebglFb->ColorAttachment0();
|
||
MOZ_ASSERT(attach.Texture());
|
||
colorTex = attach.Texture()->mGLName;
|
||
} else {
|
||
colorTex = mozFb->ColorTex();
|
||
}
|
||
|
||
// DrawBlit handles ColorMask itself.
|
||
gl->BlitHelper()->DrawBlitTextureToFramebuffer(
|
||
colorTex, size, size, LOCAL_GL_TEXTURE_2D, srcIsBGRA);
|
||
}();
|
||
|
||
if (mScissorTestEnabled) {
|
||
gl->fEnable(LOCAL_GL_SCISSOR_TEST);
|
||
}
|
||
}
|
||
|
||
// -
|
||
|
||
template <typename T, typename... Args>
|
||
constexpr auto MakeArray(Args... args) -> std::array<T, sizeof...(Args)> {
|
||
return {{static_cast<T>(args)...}};
|
||
}
|
||
|
||
inline gfx::ColorSpace2 ToColorSpace2(const WebGLContextOptions& options) {
|
||
if (options.ignoreColorSpace) {
|
||
return gfx::ColorSpace2::UNKNOWN;
|
||
}
|
||
return gfx::ToColorSpace2(options.colorSpace);
|
||
}
|
||
|
||
// -
|
||
|
||
// For an overview of how WebGL compositing works, see:
|
||
// https://wiki.mozilla.org/Platform/GFX/WebGL/Compositing
|
||
bool WebGLContext::PresentInto(gl::SwapChain& swapChain) {
|
||
OnEndOfFrame();
|
||
|
||
if (!ValidateAndInitFB(nullptr)) return false;
|
||
|
||
{
|
||
const auto colorSpace = ToColorSpace2(mOptions);
|
||
auto presenter = swapChain.Acquire(mDefaultFB->mSize, colorSpace);
|
||
if (!presenter) {
|
||
GenerateWarning("Swap chain surface creation failed.");
|
||
LoseContext();
|
||
return false;
|
||
}
|
||
|
||
const auto destFb = presenter->Fb();
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, destFb);
|
||
|
||
BlitBackbufferToCurDriverFB();
|
||
|
||
if (!mOptions.preserveDrawingBuffer) {
|
||
if (gl->IsSupported(gl::GLFeature::invalidate_framebuffer)) {
|
||
gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, mDefaultFB->mFB);
|
||
constexpr auto attachments = MakeArray<GLenum>(
|
||
LOCAL_GL_COLOR_ATTACHMENT0, LOCAL_GL_DEPTH_STENCIL_ATTACHMENT);
|
||
gl->fInvalidateFramebuffer(LOCAL_GL_READ_FRAMEBUFFER,
|
||
attachments.size(), attachments.data());
|
||
}
|
||
mDefaultFB_IsInvalid = true;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
if (!mOptions.alpha) {
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, destFb);
|
||
gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, 4);
|
||
if (IsWebGL2()) {
|
||
gl->fPixelStorei(LOCAL_GL_PACK_ROW_LENGTH, 0);
|
||
gl->fPixelStorei(LOCAL_GL_PACK_SKIP_PIXELS, 0);
|
||
gl->fPixelStorei(LOCAL_GL_PACK_SKIP_ROWS, 0);
|
||
}
|
||
uint32_t pixel = 0xffbadbad;
|
||
gl->fReadPixels(0, 0, 1, 1, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE,
|
||
&pixel);
|
||
MOZ_ASSERT((pixel & 0xff000000) == 0xff000000);
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
bool WebGLContext::PresentIntoXR(gl::SwapChain& swapChain,
|
||
const gl::MozFramebuffer& fb) {
|
||
OnEndOfFrame();
|
||
|
||
const auto colorSpace = ToColorSpace2(mOptions);
|
||
auto presenter = swapChain.Acquire(fb.mSize, colorSpace);
|
||
if (!presenter) {
|
||
GenerateWarning("Swap chain surface creation failed.");
|
||
LoseContext();
|
||
return false;
|
||
}
|
||
|
||
const auto destFb = presenter->Fb();
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, destFb);
|
||
|
||
BlitBackbufferToCurDriverFB(nullptr, &fb);
|
||
|
||
// https://immersive-web.github.io/webxr/#opaque-framebuffer
|
||
// Opaque framebuffers will always be cleared regardless of the
|
||
// associated WebGL context’s preserveDrawingBuffer value.
|
||
if (gl->IsSupported(gl::GLFeature::invalidate_framebuffer)) {
|
||
gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, fb.mFB);
|
||
constexpr auto attachments = MakeArray<GLenum>(
|
||
LOCAL_GL_COLOR_ATTACHMENT0, LOCAL_GL_DEPTH_STENCIL_ATTACHMENT);
|
||
gl->fInvalidateFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, attachments.size(),
|
||
attachments.data());
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
// Initialize a swap chain's surface factory given the desired surface type.
|
||
void InitSwapChain(gl::GLContext& gl, gl::SwapChain& swapChain,
|
||
const layers::TextureType consumerType) {
|
||
if (!swapChain.mFactory) {
|
||
auto typedFactory = gl::SurfaceFactory::Create(&gl, consumerType);
|
||
if (typedFactory) {
|
||
swapChain.mFactory = std::move(typedFactory);
|
||
}
|
||
}
|
||
if (!swapChain.mFactory) {
|
||
NS_WARNING("Failed to make an ideal SurfaceFactory.");
|
||
swapChain.mFactory = MakeUnique<gl::SurfaceFactory_Basic>(gl);
|
||
}
|
||
MOZ_ASSERT(swapChain.mFactory);
|
||
}
|
||
|
||
void WebGLContext::Present(WebGLFramebuffer* const xrFb,
|
||
const layers::TextureType consumerType,
|
||
const bool webvr,
|
||
const webgl::SwapChainOptions& options) {
|
||
const FuncScope funcScope(*this, "<Present>");
|
||
if (IsContextLost()) return;
|
||
|
||
auto swapChain = GetSwapChain(xrFb, webvr);
|
||
const gl::MozFramebuffer* maybeFB = nullptr;
|
||
if (xrFb) {
|
||
maybeFB = xrFb->mOpaque.get();
|
||
} else {
|
||
mResolvedDefaultFB = nullptr;
|
||
}
|
||
|
||
InitSwapChain(*gl, *swapChain, consumerType);
|
||
|
||
bool valid =
|
||
maybeFB ? PresentIntoXR(*swapChain, *maybeFB) : PresentInto(*swapChain);
|
||
if (!valid) {
|
||
return;
|
||
}
|
||
|
||
bool useAsync = options.remoteTextureOwnerId.IsValid() &&
|
||
options.remoteTextureId.IsValid();
|
||
if (useAsync) {
|
||
PushRemoteTexture(nullptr, *swapChain, swapChain->FrontBuffer(), options);
|
||
}
|
||
}
|
||
|
||
void WebGLContext::CopyToSwapChain(WebGLFramebuffer* const srcFb,
|
||
const layers::TextureType consumerType,
|
||
const webgl::SwapChainOptions& options) {
|
||
const FuncScope funcScope(*this, "<CopyToSwapChain>");
|
||
if (IsContextLost()) return;
|
||
|
||
OnEndOfFrame();
|
||
|
||
if (!srcFb) return;
|
||
const auto* info = srcFb->GetCompletenessInfo();
|
||
if (!info) {
|
||
return;
|
||
}
|
||
gfx::IntSize size(info->width, info->height);
|
||
|
||
InitSwapChain(*gl, srcFb->mSwapChain, consumerType);
|
||
|
||
bool useAsync = options.remoteTextureOwnerId.IsValid() &&
|
||
options.remoteTextureId.IsValid();
|
||
// If we're using async present and if there is no way to serialize surfaces,
|
||
// then a readback is required to do the copy. In this case, there's no reason
|
||
// to copy into a separate shared surface for the front buffer. Just directly
|
||
// read back the WebGL framebuffer into and push it as a remote texture.
|
||
if (useAsync && srcFb->mSwapChain.mFactory->GetConsumerType() ==
|
||
layers::TextureType::Unknown) {
|
||
PushRemoteTexture(srcFb, srcFb->mSwapChain, nullptr, options);
|
||
return;
|
||
}
|
||
|
||
{
|
||
// ColorSpace will need to be part of SwapChainOptions for DTWebgl.
|
||
const auto colorSpace = ToColorSpace2(mOptions);
|
||
auto presenter = srcFb->mSwapChain.Acquire(size, colorSpace);
|
||
if (!presenter) {
|
||
GenerateWarning("Swap chain surface creation failed.");
|
||
LoseContext();
|
||
return;
|
||
}
|
||
|
||
const ScopedFBRebinder saveFB(this);
|
||
|
||
const auto destFb = presenter->Fb();
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, destFb);
|
||
|
||
BlitBackbufferToCurDriverFB(srcFb, nullptr, options.bgra);
|
||
}
|
||
|
||
if (useAsync) {
|
||
PushRemoteTexture(srcFb, srcFb->mSwapChain, srcFb->mSwapChain.FrontBuffer(),
|
||
options);
|
||
}
|
||
}
|
||
|
||
bool WebGLContext::PushRemoteTexture(WebGLFramebuffer* fb,
|
||
gl::SwapChain& swapChain,
|
||
std::shared_ptr<gl::SharedSurface> surf,
|
||
const webgl::SwapChainOptions& options) {
|
||
const auto onFailure = [&]() -> bool {
|
||
GenerateWarning("Remote texture creation failed.");
|
||
LoseContext();
|
||
return false;
|
||
};
|
||
|
||
if (!mRemoteTextureOwner) {
|
||
// Ensure we have a remote texture owner client for WebGLParent.
|
||
const auto* outOfProcess = mHost ? mHost->mOwnerData.outOfProcess : nullptr;
|
||
if (!outOfProcess) {
|
||
return onFailure();
|
||
}
|
||
mRemoteTextureOwner =
|
||
MakeRefPtr<layers::RemoteTextureOwnerClient>(outOfProcess->OtherPid());
|
||
}
|
||
|
||
layers::RemoteTextureOwnerId ownerId = options.remoteTextureOwnerId;
|
||
layers::RemoteTextureId textureId = options.remoteTextureId;
|
||
|
||
if (!mRemoteTextureOwner->IsRegistered(ownerId)) {
|
||
// Register a texture owner to represent the swap chain.
|
||
RefPtr<layers::RemoteTextureOwnerClient> textureOwner = mRemoteTextureOwner;
|
||
auto destroyedCallback = [textureOwner, ownerId]() {
|
||
textureOwner->UnregisterTextureOwner(ownerId);
|
||
};
|
||
|
||
swapChain.SetDestroyedCallback(destroyedCallback);
|
||
mRemoteTextureOwner->RegisterTextureOwner(ownerId);
|
||
}
|
||
|
||
MOZ_ASSERT(fb || surf);
|
||
gfx::IntSize size;
|
||
if (surf) {
|
||
size = surf->mDesc.size;
|
||
} else {
|
||
const auto* info = fb->GetCompletenessInfo();
|
||
MOZ_ASSERT(info);
|
||
size = gfx::IntSize(info->width, info->height);
|
||
}
|
||
|
||
const auto surfaceFormat = mOptions.alpha ? gfx::SurfaceFormat::B8G8R8A8
|
||
: gfx::SurfaceFormat::B8G8R8X8;
|
||
Maybe<layers::SurfaceDescriptor> desc;
|
||
if (surf) {
|
||
desc = surf->ToSurfaceDescriptor();
|
||
}
|
||
if (!desc) {
|
||
// If we can't serialize to a surface descriptor, then we need to create
|
||
// a buffer to read back into that will become the remote texture.
|
||
auto data = mRemoteTextureOwner->CreateOrRecycleBufferTextureData(
|
||
ownerId, size, surfaceFormat);
|
||
if (!data) {
|
||
gfxCriticalNoteOnce << "Failed to allocate BufferTextureData";
|
||
return onFailure();
|
||
}
|
||
|
||
layers::MappedTextureData mappedData;
|
||
if (!data->BorrowMappedData(mappedData)) {
|
||
return onFailure();
|
||
}
|
||
|
||
Range<uint8_t> range = {mappedData.data,
|
||
data->AsBufferTextureData()->GetBufferSize()};
|
||
|
||
// If we have a surface representing the front buffer, then try to snapshot
|
||
// that. Otherwise, when there is no surface, we read back directly from the
|
||
// WebGL framebuffer.
|
||
auto valid =
|
||
surf ? FrontBufferSnapshotInto(surf, Some(range),
|
||
Some(mappedData.stride))
|
||
: SnapshotInto(fb->mGLName, size, range, Some(mappedData.stride));
|
||
if (!valid) {
|
||
return onFailure();
|
||
}
|
||
|
||
if (!options.bgra) {
|
||
// If the buffer is already BGRA, we don't need to swizzle. However, if it
|
||
// is RGBA, then a swizzle to BGRA is required.
|
||
bool rv = gfx::SwizzleData(mappedData.data, mappedData.stride,
|
||
gfx::SurfaceFormat::R8G8B8A8, mappedData.data,
|
||
mappedData.stride,
|
||
gfx::SurfaceFormat::B8G8R8A8, mappedData.size);
|
||
MOZ_RELEASE_ASSERT(rv, "SwizzleData failed!");
|
||
}
|
||
|
||
mRemoteTextureOwner->PushTexture(textureId, ownerId, std::move(data),
|
||
/* aSharedSurface */ nullptr);
|
||
return true;
|
||
}
|
||
|
||
// SharedSurfaces of SurfaceDescriptorD3D10 and SurfaceDescriptorMacIOSurface
|
||
// need to be kept alive. They will be recycled by
|
||
// RemoteTextureOwnerClient::GetRecycledSharedSurface() when their usages are
|
||
// ended.
|
||
std::shared_ptr<gl::SharedSurface> keepAlive;
|
||
switch (desc->type()) {
|
||
case layers::SurfaceDescriptor::TSurfaceDescriptorD3D10:
|
||
case layers::SurfaceDescriptor::TSurfaceDescriptorMacIOSurface:
|
||
keepAlive = surf;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
auto data =
|
||
MakeUnique<layers::SharedSurfaceTextureData>(*desc, surfaceFormat, size);
|
||
mRemoteTextureOwner->PushTexture(textureId, ownerId, std::move(data),
|
||
keepAlive);
|
||
auto recycledSurface = mRemoteTextureOwner->GetRecycledSharedSurface(ownerId);
|
||
if (recycledSurface) {
|
||
swapChain.StoreRecycledSurface(recycledSurface);
|
||
}
|
||
return true;
|
||
}
|
||
|
||
void WebGLContext::EndOfFrame() {
|
||
const FuncScope funcScope(*this, "<EndOfFrame>");
|
||
if (IsContextLost()) return;
|
||
|
||
OnEndOfFrame();
|
||
}
|
||
|
||
gl::SwapChain* WebGLContext::GetSwapChain(WebGLFramebuffer* const xrFb,
|
||
const bool webvr) {
|
||
auto swapChain = webvr ? &mWebVRSwapChain : &mSwapChain;
|
||
if (xrFb) {
|
||
swapChain = &xrFb->mSwapChain;
|
||
}
|
||
return swapChain;
|
||
}
|
||
|
||
Maybe<layers::SurfaceDescriptor> WebGLContext::GetFrontBuffer(
|
||
WebGLFramebuffer* const xrFb, const bool webvr) {
|
||
auto* swapChain = GetSwapChain(xrFb, webvr);
|
||
if (!swapChain) return {};
|
||
const auto& front = swapChain->FrontBuffer();
|
||
if (!front) return {};
|
||
|
||
return front->ToSurfaceDescriptor();
|
||
}
|
||
|
||
Maybe<uvec2> WebGLContext::FrontBufferSnapshotInto(
|
||
const Maybe<Range<uint8_t>> maybeDest, const Maybe<size_t> destStride) {
|
||
const auto& front = mSwapChain.FrontBuffer();
|
||
if (!front) return {};
|
||
return FrontBufferSnapshotInto(front, maybeDest, destStride);
|
||
}
|
||
|
||
Maybe<uvec2> WebGLContext::FrontBufferSnapshotInto(
|
||
const std::shared_ptr<gl::SharedSurface>& front,
|
||
const Maybe<Range<uint8_t>> maybeDest, const Maybe<size_t> destStride) {
|
||
const auto& size = front->mDesc.size;
|
||
if (!maybeDest) return Some(*uvec2::FromSize(size));
|
||
|
||
// -
|
||
|
||
front->WaitForBufferOwnership();
|
||
front->LockProd();
|
||
front->ProducerReadAcquire();
|
||
auto reset = MakeScopeExit([&] {
|
||
front->ProducerReadRelease();
|
||
front->UnlockProd();
|
||
});
|
||
|
||
// -
|
||
|
||
return SnapshotInto(front->mFb ? front->mFb->mFB : 0, size, *maybeDest,
|
||
destStride);
|
||
}
|
||
|
||
Maybe<uvec2> WebGLContext::SnapshotInto(GLuint srcFb, const gfx::IntSize& size,
|
||
const Range<uint8_t>& dest,
|
||
const Maybe<size_t> destStride) {
|
||
const auto minStride = CheckedInt<size_t>(size.width) * 4;
|
||
if (!minStride.isValid()) {
|
||
gfxCriticalError() << "SnapshotInto: invalid stride, width:" << size.width;
|
||
return {};
|
||
}
|
||
size_t stride = destStride.valueOr(minStride.value());
|
||
if (stride < minStride.value() || (stride % 4) != 0) {
|
||
gfxCriticalError() << "SnapshotInto: invalid stride, width:" << size.width
|
||
<< ", stride:" << stride;
|
||
return {};
|
||
}
|
||
|
||
gl->fPixelStorei(LOCAL_GL_PACK_ALIGNMENT, 1);
|
||
if (IsWebGL2()) {
|
||
gl->fPixelStorei(LOCAL_GL_PACK_ROW_LENGTH,
|
||
stride > minStride.value() ? stride / 4 : 0);
|
||
gl->fPixelStorei(LOCAL_GL_PACK_SKIP_PIXELS, 0);
|
||
gl->fPixelStorei(LOCAL_GL_PACK_SKIP_ROWS, 0);
|
||
}
|
||
|
||
// -
|
||
|
||
const auto readFbWas = mBoundReadFramebuffer;
|
||
const auto pboWas = mBoundPixelPackBuffer;
|
||
|
||
GLenum fbTarget = LOCAL_GL_READ_FRAMEBUFFER;
|
||
if (!IsWebGL2()) {
|
||
fbTarget = LOCAL_GL_FRAMEBUFFER;
|
||
}
|
||
auto reset2 = MakeScopeExit([&] {
|
||
DoBindFB(readFbWas, fbTarget);
|
||
if (pboWas) {
|
||
BindBuffer(LOCAL_GL_PIXEL_PACK_BUFFER, pboWas);
|
||
}
|
||
});
|
||
|
||
gl->fBindFramebuffer(fbTarget, srcFb);
|
||
if (pboWas) {
|
||
BindBuffer(LOCAL_GL_PIXEL_PACK_BUFFER, nullptr);
|
||
}
|
||
|
||
// -
|
||
|
||
const auto srcByteCount = CheckedInt<size_t>(stride) * size.height;
|
||
if (!srcByteCount.isValid()) {
|
||
gfxCriticalError() << "SnapshotInto: invalid srcByteCount, width:"
|
||
<< size.width << ", height:" << size.height;
|
||
return {};
|
||
}
|
||
const auto dstByteCount = dest.length();
|
||
if (srcByteCount.value() > dstByteCount) {
|
||
gfxCriticalError() << "SnapshotInto: srcByteCount:" << srcByteCount.value()
|
||
<< " > dstByteCount:" << dstByteCount;
|
||
return {};
|
||
}
|
||
uint8_t* dstPtr = dest.begin().get();
|
||
gl->fReadPixels(0, 0, size.width, size.height, LOCAL_GL_RGBA,
|
||
LOCAL_GL_UNSIGNED_BYTE, dstPtr);
|
||
|
||
if (!IsWebGL2() && stride > minStride.value() && size.height > 1) {
|
||
// WebGL 1 doesn't support PACK_ROW_LENGTH. Instead, we read the data tight
|
||
// into the front of the buffer, and use memmove (since the source and dest
|
||
// may overlap) starting from the back to move it to the correct stride
|
||
// offsets. We don't move the first row as it is already in the right place.
|
||
uint8_t* destRow = dstPtr + stride * (size.height - 1);
|
||
const uint8_t* srcRow = dstPtr + minStride.value() * (size.height - 1);
|
||
while (destRow > dstPtr) {
|
||
memmove(destRow, srcRow, minStride.value());
|
||
destRow -= stride;
|
||
srcRow -= minStride.value();
|
||
}
|
||
}
|
||
|
||
return Some(*uvec2::FromSize(size));
|
||
}
|
||
|
||
void WebGLContext::ClearVRSwapChain() { mWebVRSwapChain.ClearPool(); }
|
||
|
||
// ------------------------
|
||
|
||
RefPtr<gfx::DataSourceSurface> GetTempSurface(const gfx::IntSize& aSize,
|
||
gfx::SurfaceFormat& aFormat) {
|
||
uint32_t stride =
|
||
gfx::GetAlignedStride<8>(aSize.width, BytesPerPixel(aFormat));
|
||
return gfx::Factory::CreateDataSourceSurfaceWithStride(aSize, aFormat,
|
||
stride);
|
||
}
|
||
|
||
void WebGLContext::DummyReadFramebufferOperation() {
|
||
if (!mBoundReadFramebuffer) return; // Infallible.
|
||
|
||
const auto status = mBoundReadFramebuffer->CheckFramebufferStatus();
|
||
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
|
||
ErrorInvalidFramebufferOperation("Framebuffer must be complete.");
|
||
}
|
||
}
|
||
|
||
bool WebGLContext::Has64BitTimestamps() const {
|
||
// 'sync' provides glGetInteger64v either by supporting ARB_sync, GL3+, or
|
||
// GLES3+.
|
||
return gl->IsSupported(gl::GLFeature::sync);
|
||
}
|
||
|
||
static bool CheckContextLost(gl::GLContext* gl, bool* const out_isGuilty) {
|
||
MOZ_ASSERT(gl);
|
||
|
||
const auto resetStatus = gl->fGetGraphicsResetStatus();
|
||
if (resetStatus == LOCAL_GL_NO_ERROR) {
|
||
*out_isGuilty = false;
|
||
return false;
|
||
}
|
||
|
||
// Assume guilty unless we find otherwise!
|
||
bool isGuilty = true;
|
||
switch (resetStatus) {
|
||
case LOCAL_GL_INNOCENT_CONTEXT_RESET_ARB:
|
||
case LOCAL_GL_PURGED_CONTEXT_RESET_NV:
|
||
// Either nothing wrong, or not our fault.
|
||
isGuilty = false;
|
||
break;
|
||
case LOCAL_GL_GUILTY_CONTEXT_RESET_ARB:
|
||
NS_WARNING(
|
||
"WebGL content on the page definitely caused the graphics"
|
||
" card to reset.");
|
||
break;
|
||
case LOCAL_GL_UNKNOWN_CONTEXT_RESET_ARB:
|
||
NS_WARNING(
|
||
"WebGL content on the page might have caused the graphics"
|
||
" card to reset");
|
||
// If we can't tell, assume not-guilty.
|
||
// Todo: Implement max number of "unknown" resets per document or time.
|
||
isGuilty = false;
|
||
break;
|
||
default:
|
||
gfxCriticalError() << "Unexpected glGetGraphicsResetStatus: "
|
||
<< gfx::hexa(resetStatus);
|
||
break;
|
||
}
|
||
|
||
if (isGuilty) {
|
||
NS_WARNING(
|
||
"WebGL context on this page is considered guilty, and will"
|
||
" not be restored.");
|
||
}
|
||
|
||
*out_isGuilty = isGuilty;
|
||
return true;
|
||
}
|
||
|
||
void WebGLContext::RunContextLossTimer() { mContextLossHandler.RunTimer(); }
|
||
|
||
// We use this timer for many things. Here are the things that it is activated
|
||
// for:
|
||
// 1) If a script is using the MOZ_WEBGL_lose_context extension.
|
||
// 2) If we are using EGL and _NOT ANGLE_, we query periodically to see if the
|
||
// CONTEXT_LOST_WEBGL error has been triggered.
|
||
// 3) If we are using ANGLE, or anything that supports ARB_robustness, query the
|
||
// GPU periodically to see if the reset status bit has been set.
|
||
// In all of these situations, we use this timer to send the script context lost
|
||
// and restored events asynchronously. For example, if it triggers a context
|
||
// loss, the webglcontextlost event will be sent to it the next time the
|
||
// robustness timer fires.
|
||
// Note that this timer mechanism is not used unless one of these 3 criteria are
|
||
// met.
|
||
// At a bare minimum, from context lost to context restores, it would take 3
|
||
// full timer iterations: detection, webglcontextlost, webglcontextrestored.
|
||
void WebGLContext::CheckForContextLoss() {
|
||
bool isGuilty = true;
|
||
const auto isContextLost = CheckContextLost(gl, &isGuilty);
|
||
if (!isContextLost) return;
|
||
|
||
mWebGLError = LOCAL_GL_CONTEXT_LOST;
|
||
|
||
auto reason = webgl::ContextLossReason::None;
|
||
if (isGuilty) {
|
||
reason = webgl::ContextLossReason::Guilty;
|
||
}
|
||
LoseContext(reason);
|
||
}
|
||
|
||
void WebGLContext::HandlePendingContextLoss() {
|
||
mIsContextLost = true;
|
||
mHost->OnContextLoss(mPendingContextLossReason);
|
||
}
|
||
|
||
void WebGLContext::LoseContextLruLocked(const webgl::ContextLossReason reason) {
|
||
printf_stderr("WebGL(%p)::LoseContext(%u)\n", this,
|
||
static_cast<uint32_t>(reason));
|
||
mLruPosition.ResetLocked();
|
||
mPendingContextLossReason = reason;
|
||
mPendingContextLoss = true;
|
||
}
|
||
|
||
void WebGLContext::LoseContext(const webgl::ContextLossReason reason) {
|
||
StaticMutexAutoLock lock(sLruMutex);
|
||
LoseContextLruLocked(reason);
|
||
HandlePendingContextLoss();
|
||
}
|
||
|
||
void WebGLContext::DidRefresh() {
|
||
if (gl) {
|
||
gl->FlushIfHeavyGLCallsSinceLastFlush();
|
||
}
|
||
}
|
||
|
||
////////////////////////////////////////////////////////////////////////////////
|
||
|
||
uvec2 WebGLContext::DrawingBufferSize() {
|
||
const FuncScope funcScope(*this, "width/height");
|
||
if (IsContextLost()) return {};
|
||
|
||
if (!EnsureDefaultFB()) return {};
|
||
|
||
return *uvec2::FromSize(mDefaultFB->mSize);
|
||
}
|
||
|
||
bool WebGLContext::ValidateAndInitFB(const WebGLFramebuffer* const fb,
|
||
const GLenum incompleteFbError) {
|
||
if (fb) return fb->ValidateAndInitAttachments(incompleteFbError);
|
||
|
||
if (!EnsureDefaultFB()) return false;
|
||
|
||
if (mDefaultFB_IsInvalid) {
|
||
// Clear it!
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mDefaultFB->mFB);
|
||
const webgl::ScopedPrepForResourceClear scopedPrep(*this);
|
||
if (!mOptions.alpha) {
|
||
gl->fClearColor(0, 0, 0, 1);
|
||
}
|
||
const GLbitfield bits = LOCAL_GL_COLOR_BUFFER_BIT |
|
||
LOCAL_GL_DEPTH_BUFFER_BIT |
|
||
LOCAL_GL_STENCIL_BUFFER_BIT;
|
||
gl->fClear(bits);
|
||
|
||
mDefaultFB_IsInvalid = false;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
void WebGLContext::DoBindFB(const WebGLFramebuffer* const fb,
|
||
const GLenum target) const {
|
||
const GLenum driverFB = fb ? fb->mGLName : mDefaultFB->mFB;
|
||
gl->fBindFramebuffer(target, driverFB);
|
||
}
|
||
|
||
bool WebGLContext::BindCurFBForDraw() {
|
||
const auto& fb = mBoundDrawFramebuffer;
|
||
if (!ValidateAndInitFB(fb)) return false;
|
||
|
||
DoBindFB(fb);
|
||
return true;
|
||
}
|
||
|
||
bool WebGLContext::BindCurFBForColorRead(
|
||
const webgl::FormatUsageInfo** const out_format, uint32_t* const out_width,
|
||
uint32_t* const out_height, const GLenum incompleteFbError) {
|
||
const auto& fb = mBoundReadFramebuffer;
|
||
|
||
if (fb) {
|
||
if (!ValidateAndInitFB(fb, incompleteFbError)) return false;
|
||
if (!fb->ValidateForColorRead(out_format, out_width, out_height))
|
||
return false;
|
||
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fb->mGLName);
|
||
return true;
|
||
}
|
||
|
||
if (!BindDefaultFBForRead()) return false;
|
||
|
||
if (mDefaultFB_ReadBuffer == LOCAL_GL_NONE) {
|
||
ErrorInvalidOperation(
|
||
"Can't read from backbuffer when readBuffer mode is NONE.");
|
||
return false;
|
||
}
|
||
|
||
auto effFormat = mOptions.alpha ? webgl::EffectiveFormat::RGBA8
|
||
: webgl::EffectiveFormat::RGB8;
|
||
|
||
*out_format = mFormatUsage->GetUsage(effFormat);
|
||
MOZ_ASSERT(*out_format);
|
||
|
||
*out_width = mDefaultFB->mSize.width;
|
||
*out_height = mDefaultFB->mSize.height;
|
||
return true;
|
||
}
|
||
|
||
bool WebGLContext::BindDefaultFBForRead() {
|
||
if (!ValidateAndInitFB(nullptr)) return false;
|
||
|
||
if (!mDefaultFB->mSamples) {
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mDefaultFB->mFB);
|
||
return true;
|
||
}
|
||
|
||
if (!mResolvedDefaultFB) {
|
||
mResolvedDefaultFB =
|
||
gl::MozFramebuffer::Create(gl, mDefaultFB->mSize, 0, false);
|
||
if (!mResolvedDefaultFB) {
|
||
gfxCriticalNote << FuncName() << ": Failed to create mResolvedDefaultFB.";
|
||
return false;
|
||
}
|
||
}
|
||
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mResolvedDefaultFB->mFB);
|
||
BlitBackbufferToCurDriverFB();
|
||
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mResolvedDefaultFB->mFB);
|
||
return true;
|
||
}
|
||
|
||
void WebGLContext::DoColorMask(Maybe<GLuint> i, const uint8_t bitmask) const {
|
||
if (!IsExtensionEnabled(WebGLExtensionID::OES_draw_buffers_indexed)) {
|
||
i = Nothing();
|
||
}
|
||
const auto bs = std::bitset<4>(bitmask);
|
||
if (i) {
|
||
gl->fColorMaski(*i, bs[0], bs[1], bs[2], bs[3]);
|
||
} else {
|
||
gl->fColorMask(bs[0], bs[1], bs[2], bs[3]);
|
||
}
|
||
}
|
||
|
||
////////////////////////////////////////////////////////////////////////////////
|
||
|
||
ScopedDrawCallWrapper::ScopedDrawCallWrapper(WebGLContext& webgl)
|
||
: mWebGL(webgl) {
|
||
uint8_t driverColorMask0 = mWebGL.mColorWriteMask0;
|
||
bool driverDepthTest = mWebGL.mDepthTestEnabled;
|
||
bool driverStencilTest = mWebGL.mStencilTestEnabled;
|
||
const auto& fb = mWebGL.mBoundDrawFramebuffer;
|
||
if (!fb) {
|
||
if (mWebGL.mDefaultFB_DrawBuffer0 == LOCAL_GL_NONE) {
|
||
driverColorMask0 = 0; // Is this well-optimized enough for depth-first
|
||
// rendering?
|
||
} else {
|
||
driverColorMask0 &= ~(uint8_t(mWebGL.mNeedsFakeNoAlpha) << 3);
|
||
}
|
||
driverDepthTest &= !mWebGL.mNeedsFakeNoDepth;
|
||
driverStencilTest &= !mWebGL.mNeedsFakeNoStencil;
|
||
} else {
|
||
if (mWebGL.mNeedsFakeNoStencil_UserFBs &&
|
||
fb->DepthAttachment().HasAttachment() &&
|
||
!fb->StencilAttachment().HasAttachment()) {
|
||
driverStencilTest = false;
|
||
}
|
||
}
|
||
|
||
const auto& gl = mWebGL.gl;
|
||
mWebGL.DoColorMask(Some(0), driverColorMask0);
|
||
if (mWebGL.mDriverDepthTest != driverDepthTest) {
|
||
// "When disabled, the depth comparison and subsequent possible updates to
|
||
// the
|
||
// depth buffer value are bypassed and the fragment is passed to the next
|
||
// operation." [GLES 3.0.5, p177]
|
||
mWebGL.mDriverDepthTest = driverDepthTest;
|
||
gl->SetEnabled(LOCAL_GL_DEPTH_TEST, mWebGL.mDriverDepthTest);
|
||
}
|
||
if (mWebGL.mDriverStencilTest != driverStencilTest) {
|
||
// "When disabled, the stencil test and associated modifications are not
|
||
// made, and
|
||
// the fragment is always passed." [GLES 3.0.5, p175]
|
||
mWebGL.mDriverStencilTest = driverStencilTest;
|
||
gl->SetEnabled(LOCAL_GL_STENCIL_TEST, mWebGL.mDriverStencilTest);
|
||
}
|
||
}
|
||
|
||
ScopedDrawCallWrapper::~ScopedDrawCallWrapper() {
|
||
if (mWebGL.mBoundDrawFramebuffer) return;
|
||
|
||
mWebGL.mResolvedDefaultFB = nullptr;
|
||
mWebGL.mShouldPresent = true;
|
||
}
|
||
|
||
// -
|
||
|
||
void WebGLContext::ScissorRect::Apply(gl::GLContext& gl) const {
|
||
gl.fScissor(x, y, w, h);
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
|
||
IndexedBufferBinding::IndexedBufferBinding() : mRangeStart(0), mRangeSize(0) {}
|
||
|
||
uint64_t IndexedBufferBinding::ByteCount() const {
|
||
if (!mBufferBinding) return 0;
|
||
|
||
uint64_t bufferSize = mBufferBinding->ByteLength();
|
||
if (!mRangeSize) // BindBufferBase
|
||
return bufferSize;
|
||
|
||
if (mRangeStart >= bufferSize) return 0;
|
||
bufferSize -= mRangeStart;
|
||
|
||
return std::min(bufferSize, mRangeSize);
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
|
||
ScopedFBRebinder::~ScopedFBRebinder() {
|
||
const auto fnName = [&](WebGLFramebuffer* fb) {
|
||
return fb ? fb->mGLName : 0;
|
||
};
|
||
|
||
const auto& gl = mWebGL->gl;
|
||
if (mWebGL->IsWebGL2()) {
|
||
gl->fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER,
|
||
fnName(mWebGL->mBoundDrawFramebuffer));
|
||
gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER,
|
||
fnName(mWebGL->mBoundReadFramebuffer));
|
||
} else {
|
||
MOZ_ASSERT(mWebGL->mBoundDrawFramebuffer == mWebGL->mBoundReadFramebuffer);
|
||
gl->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER,
|
||
fnName(mWebGL->mBoundDrawFramebuffer));
|
||
}
|
||
}
|
||
|
||
////////////////////
|
||
|
||
void DoBindBuffer(gl::GLContext& gl, const GLenum target,
|
||
const WebGLBuffer* const buffer) {
|
||
gl.fBindBuffer(target, buffer ? buffer->mGLName : 0);
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
|
||
bool Intersect(const int32_t srcSize, const int32_t read0,
|
||
const int32_t readSize, int32_t* const out_intRead0,
|
||
int32_t* const out_intWrite0, int32_t* const out_intSize) {
|
||
MOZ_ASSERT(srcSize >= 0);
|
||
MOZ_ASSERT(readSize >= 0);
|
||
const auto read1 = int64_t(read0) + readSize;
|
||
|
||
int32_t intRead0 = read0; // Clearly doesn't need validation.
|
||
int64_t intWrite0 = 0;
|
||
int64_t intSize = readSize;
|
||
|
||
if (read1 <= 0 || read0 >= srcSize) {
|
||
// Disjoint ranges.
|
||
intSize = 0;
|
||
} else {
|
||
if (read0 < 0) {
|
||
const auto diff = int64_t(0) - read0;
|
||
MOZ_ASSERT(diff >= 0);
|
||
intRead0 = 0;
|
||
intWrite0 = diff;
|
||
intSize -= diff;
|
||
}
|
||
if (read1 > srcSize) {
|
||
const auto diff = int64_t(read1) - srcSize;
|
||
MOZ_ASSERT(diff >= 0);
|
||
intSize -= diff;
|
||
}
|
||
|
||
if (!CheckedInt<int32_t>(intWrite0).isValid() ||
|
||
!CheckedInt<int32_t>(intSize).isValid()) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
*out_intRead0 = intRead0;
|
||
*out_intWrite0 = intWrite0;
|
||
*out_intSize = intSize;
|
||
return true;
|
||
}
|
||
|
||
// --
|
||
|
||
uint64_t AvailGroups(const uint64_t totalAvailItems,
|
||
const uint64_t firstItemOffset, const uint32_t groupSize,
|
||
const uint32_t groupStride) {
|
||
MOZ_ASSERT(groupSize && groupStride);
|
||
MOZ_ASSERT(groupSize <= groupStride);
|
||
|
||
if (totalAvailItems <= firstItemOffset) return 0;
|
||
const size_t availItems = totalAvailItems - firstItemOffset;
|
||
|
||
size_t availGroups = availItems / groupStride;
|
||
const size_t tailItems = availItems % groupStride;
|
||
if (tailItems >= groupSize) {
|
||
availGroups += 1;
|
||
}
|
||
return availGroups;
|
||
}
|
||
|
||
////////////////////////////////////////////////////////////////////////////////
|
||
|
||
const char* WebGLContext::FuncName() const {
|
||
const char* ret;
|
||
if (MOZ_LIKELY(mFuncScope)) {
|
||
ret = mFuncScope->mFuncName;
|
||
} else {
|
||
NS_WARNING("FuncScope not on stack!");
|
||
ret = "<unknown function>";
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
// -
|
||
|
||
WebGLContext::FuncScope::FuncScope(const WebGLContext& webgl,
|
||
const char* const funcName)
|
||
: mWebGL(webgl), mFuncName(bool(mWebGL.mFuncScope) ? nullptr : funcName) {
|
||
if (!mFuncName) return;
|
||
mWebGL.mFuncScope = this;
|
||
}
|
||
|
||
WebGLContext::FuncScope::~FuncScope() {
|
||
if (mBindFailureGuard) {
|
||
gfxCriticalError() << "mBindFailureGuard failure: Early exit from "
|
||
<< mWebGL.FuncName();
|
||
}
|
||
|
||
if (!mFuncName) return;
|
||
mWebGL.mFuncScope = nullptr;
|
||
}
|
||
|
||
// --
|
||
|
||
bool ClientWebGLContext::IsXRCompatible() const { return mXRCompatible; }
|
||
|
||
already_AddRefed<dom::Promise> ClientWebGLContext::MakeXRCompatible(
|
||
ErrorResult& aRv) {
|
||
const FuncScope funcScope(*this, "MakeXRCompatible");
|
||
nsCOMPtr<nsIGlobalObject> global = GetParentObject();
|
||
if (!global) {
|
||
aRv.ThrowInvalidAccessError(
|
||
"Using a WebGL context that is not attached to either a canvas or an "
|
||
"OffscreenCanvas");
|
||
return nullptr;
|
||
}
|
||
RefPtr<dom::Promise> promise = dom::Promise::Create(global, aRv);
|
||
NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
|
||
|
||
if (IsContextLost()) {
|
||
promise->MaybeRejectWithInvalidStateError(
|
||
"Can not make context XR compatible when context is already lost.");
|
||
return promise.forget();
|
||
}
|
||
|
||
// TODO: Bug 1580258 - WebGLContext.MakeXRCompatible needs to switch to
|
||
// the device connected to the XR hardware
|
||
// This should update `options` and lose+restore the context.
|
||
mXRCompatible = true;
|
||
promise->MaybeResolveWithUndefined();
|
||
return promise.forget();
|
||
}
|
||
|
||
// --
|
||
|
||
webgl::AvailabilityRunnable& ClientWebGLContext::EnsureAvailabilityRunnable()
|
||
const {
|
||
if (!mAvailabilityRunnable) {
|
||
mAvailabilityRunnable = new webgl::AvailabilityRunnable(this);
|
||
auto forgettable = mAvailabilityRunnable;
|
||
NS_DispatchToCurrentThread(forgettable.forget());
|
||
}
|
||
return *mAvailabilityRunnable;
|
||
}
|
||
|
||
webgl::AvailabilityRunnable::AvailabilityRunnable(
|
||
const ClientWebGLContext* const webgl)
|
||
: DiscardableRunnable("webgl::AvailabilityRunnable"), mWebGL(webgl) {}
|
||
|
||
webgl::AvailabilityRunnable::~AvailabilityRunnable() {
|
||
MOZ_ASSERT(mQueries.empty());
|
||
MOZ_ASSERT(mSyncs.empty());
|
||
}
|
||
|
||
nsresult webgl::AvailabilityRunnable::Run() {
|
||
for (const auto& cur : mQueries) {
|
||
if (!cur) continue;
|
||
cur->mCanBeAvailable = true;
|
||
}
|
||
mQueries.clear();
|
||
|
||
for (const auto& cur : mSyncs) {
|
||
if (!cur) continue;
|
||
cur->mCanBeAvailable = true;
|
||
}
|
||
mSyncs.clear();
|
||
|
||
if (mWebGL) {
|
||
mWebGL->mAvailabilityRunnable = nullptr;
|
||
}
|
||
return NS_OK;
|
||
}
|
||
|
||
// -
|
||
|
||
void WebGLContext::GenerateErrorImpl(const GLenum errOrWarning,
|
||
const std::string& text) const {
|
||
auto err = errOrWarning;
|
||
bool isPerfWarning = false;
|
||
if (err == webgl::kErrorPerfWarning) {
|
||
err = 0;
|
||
isPerfWarning = true;
|
||
}
|
||
|
||
if (err && mFuncScope && mFuncScope->mBindFailureGuard) {
|
||
gfxCriticalError() << "mBindFailureGuard failure: Generating error "
|
||
<< EnumString(err) << ": " << text;
|
||
}
|
||
|
||
/* ES2 section 2.5 "GL Errors" states that implementations can have
|
||
* multiple 'flags', as errors might be caught in different parts of
|
||
* a distributed implementation.
|
||
* We're signing up as a distributed implementation here, with
|
||
* separate flags for WebGL and the underlying GLContext.
|
||
*/
|
||
if (!mWebGLError) mWebGLError = err;
|
||
|
||
if (!mHost) return; // Impossible?
|
||
|
||
// -
|
||
|
||
const auto ShouldWarn = [&]() {
|
||
if (isPerfWarning) {
|
||
return ShouldGeneratePerfWarnings();
|
||
}
|
||
return ShouldGenerateWarnings();
|
||
};
|
||
if (!ShouldWarn()) return;
|
||
|
||
// -
|
||
|
||
auto* pNumWarnings = &mWarningCount;
|
||
const char* warningsType = "warnings";
|
||
if (isPerfWarning) {
|
||
pNumWarnings = &mNumPerfWarnings;
|
||
warningsType = "perf warnings";
|
||
}
|
||
|
||
if (isPerfWarning) {
|
||
const auto perfText = std::string("WebGL perf warning: ") + text;
|
||
mHost->JsWarning(perfText);
|
||
} else {
|
||
mHost->JsWarning(text);
|
||
}
|
||
*pNumWarnings += 1;
|
||
|
||
if (!ShouldWarn()) {
|
||
const auto& msg = nsPrintfCString(
|
||
"After reporting %i, no further %s will be reported for this WebGL "
|
||
"context.",
|
||
int(*pNumWarnings), warningsType);
|
||
mHost->JsWarning(ToString(msg));
|
||
}
|
||
}
|
||
|
||
// -
|
||
|
||
Maybe<std::string> WebGLContext::GetString(const GLenum pname) const {
|
||
const WebGLContext::FuncScope funcScope(*this, "getParameter");
|
||
if (IsContextLost()) return {};
|
||
|
||
const auto FromRaw = [](const char* const raw) -> Maybe<std::string> {
|
||
if (!raw) return {};
|
||
return Some(std::string(raw));
|
||
};
|
||
|
||
switch (pname) {
|
||
case LOCAL_GL_EXTENSIONS: {
|
||
if (!gl->IsCoreProfile()) {
|
||
const auto rawExt = (const char*)gl->fGetString(LOCAL_GL_EXTENSIONS);
|
||
return FromRaw(rawExt);
|
||
}
|
||
std::string ret;
|
||
const auto& numExts = gl->GetIntAs<GLuint>(LOCAL_GL_NUM_EXTENSIONS);
|
||
for (GLuint i = 0; i < numExts; i++) {
|
||
const auto rawExt =
|
||
(const char*)gl->fGetStringi(LOCAL_GL_EXTENSIONS, i);
|
||
if (!rawExt) continue;
|
||
|
||
if (i > 0) {
|
||
ret += " ";
|
||
}
|
||
ret += rawExt;
|
||
}
|
||
return Some(std::move(ret));
|
||
}
|
||
|
||
case LOCAL_GL_RENDERER:
|
||
case LOCAL_GL_VENDOR:
|
||
case LOCAL_GL_VERSION: {
|
||
const auto raw = (const char*)gl->fGetString(pname);
|
||
return FromRaw(raw);
|
||
}
|
||
|
||
case dom::MOZ_debug_Binding::WSI_INFO: {
|
||
nsCString info;
|
||
gl->GetWSIInfo(&info);
|
||
return Some(std::string(info.BeginReading()));
|
||
}
|
||
|
||
default:
|
||
ErrorInvalidEnumArg("pname", pname);
|
||
return {};
|
||
}
|
||
}
|
||
|
||
// ---------------------------------
|
||
|
||
Maybe<webgl::IndexedName> webgl::ParseIndexed(const std::string& str) {
|
||
static const std::regex kRegex("(.*)\\[([0-9]+)\\]");
|
||
|
||
std::smatch match;
|
||
if (!std::regex_match(str, match, kRegex)) return {};
|
||
|
||
const auto index = std::stoull(match[2]);
|
||
return Some(webgl::IndexedName{match[1], index});
|
||
}
|
||
|
||
// ExplodeName("foo.bar[3].x") -> ["foo", ".", "bar", "[", "3", "]", ".", "x"]
|
||
static std::vector<std::string> ExplodeName(const std::string& str) {
|
||
std::vector<std::string> ret;
|
||
|
||
static const std::regex kSep("[.[\\]]");
|
||
|
||
auto itr = std::regex_token_iterator<decltype(str.begin())>(
|
||
str.begin(), str.end(), kSep, {-1, 0});
|
||
const auto end = decltype(itr)();
|
||
|
||
for (; itr != end; ++itr) {
|
||
const auto& part = itr->str();
|
||
if (part.size()) {
|
||
ret.push_back(part);
|
||
}
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
//-
|
||
|
||
//#define DUMP_MakeLinkResult
|
||
|
||
webgl::LinkActiveInfo GetLinkActiveInfo(
|
||
gl::GLContext& gl, const GLuint prog, const bool webgl2,
|
||
const std::unordered_map<std::string, std::string>& nameUnmap) {
|
||
webgl::LinkActiveInfo ret;
|
||
[&]() {
|
||
const auto fnGetProgramui = [&](const GLenum pname) {
|
||
GLint ret = 0;
|
||
gl.fGetProgramiv(prog, pname, &ret);
|
||
return static_cast<uint32_t>(ret);
|
||
};
|
||
|
||
std::vector<char> stringBuffer(1);
|
||
const auto fnEnsureCapacity = [&](const GLenum pname) {
|
||
const auto maxWithNull = fnGetProgramui(pname);
|
||
if (maxWithNull > stringBuffer.size()) {
|
||
stringBuffer.resize(maxWithNull);
|
||
}
|
||
};
|
||
|
||
fnEnsureCapacity(LOCAL_GL_ACTIVE_ATTRIBUTE_MAX_LENGTH);
|
||
fnEnsureCapacity(LOCAL_GL_ACTIVE_UNIFORM_MAX_LENGTH);
|
||
if (webgl2) {
|
||
fnEnsureCapacity(LOCAL_GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH);
|
||
fnEnsureCapacity(LOCAL_GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH);
|
||
}
|
||
|
||
// -
|
||
|
||
const auto fnUnmapName = [&](const std::string& mappedName) {
|
||
const auto parts = ExplodeName(mappedName);
|
||
|
||
std::ostringstream ret;
|
||
for (const auto& part : parts) {
|
||
const auto maybe = MaybeFind(nameUnmap, part);
|
||
if (maybe) {
|
||
ret << *maybe;
|
||
} else {
|
||
ret << part;
|
||
}
|
||
}
|
||
return ret.str();
|
||
};
|
||
|
||
// -
|
||
|
||
{
|
||
const auto count = fnGetProgramui(LOCAL_GL_ACTIVE_ATTRIBUTES);
|
||
ret.activeAttribs.reserve(count);
|
||
for (const auto i : IntegerRange(count)) {
|
||
GLsizei lengthWithoutNull = 0;
|
||
GLint elemCount = 0; // `size`
|
||
GLenum elemType = 0; // `type`
|
||
gl.fGetActiveAttrib(prog, i, stringBuffer.size(), &lengthWithoutNull,
|
||
&elemCount, &elemType, stringBuffer.data());
|
||
if (!elemType) {
|
||
const auto error = gl.fGetError();
|
||
if (error != LOCAL_GL_CONTEXT_LOST) {
|
||
gfxCriticalError() << "Failed to do glGetActiveAttrib: " << error;
|
||
}
|
||
return;
|
||
}
|
||
const auto mappedName =
|
||
std::string(stringBuffer.data(), lengthWithoutNull);
|
||
const auto userName = fnUnmapName(mappedName);
|
||
|
||
auto loc = gl.fGetAttribLocation(prog, mappedName.c_str());
|
||
if (mappedName.find("gl_") == 0) {
|
||
// Bug 1328559: Appears problematic on ANGLE and OSX, but not Linux or
|
||
// Win+GL.
|
||
loc = -1;
|
||
}
|
||
|
||
#ifdef DUMP_MakeLinkResult
|
||
printf_stderr("[attrib %u/%u] @%i %s->%s\n", i, count, loc,
|
||
userName.c_str(), mappedName.c_str());
|
||
#endif
|
||
webgl::ActiveAttribInfo info;
|
||
info.elemType = elemType;
|
||
info.elemCount = elemCount;
|
||
info.name = userName;
|
||
info.location = loc;
|
||
info.baseType = webgl::ToAttribBaseType(info.elemType);
|
||
ret.activeAttribs.push_back(std::move(info));
|
||
}
|
||
}
|
||
|
||
// -
|
||
|
||
{
|
||
const auto count = fnGetProgramui(LOCAL_GL_ACTIVE_UNIFORMS);
|
||
ret.activeUniforms.reserve(count);
|
||
|
||
std::vector<GLint> blockIndexList(count, -1);
|
||
std::vector<GLint> blockOffsetList(count, -1);
|
||
std::vector<GLint> blockArrayStrideList(count, -1);
|
||
std::vector<GLint> blockMatrixStrideList(count, -1);
|
||
std::vector<GLint> blockIsRowMajorList(count, 0);
|
||
|
||
if (webgl2 && count) {
|
||
std::vector<GLuint> activeIndices;
|
||
activeIndices.reserve(count);
|
||
for (const auto i : IntegerRange(count)) {
|
||
activeIndices.push_back(i);
|
||
}
|
||
|
||
gl.fGetActiveUniformsiv(
|
||
prog, activeIndices.size(), activeIndices.data(),
|
||
LOCAL_GL_UNIFORM_BLOCK_INDEX, blockIndexList.data());
|
||
|
||
gl.fGetActiveUniformsiv(prog, activeIndices.size(),
|
||
activeIndices.data(), LOCAL_GL_UNIFORM_OFFSET,
|
||
blockOffsetList.data());
|
||
|
||
gl.fGetActiveUniformsiv(
|
||
prog, activeIndices.size(), activeIndices.data(),
|
||
LOCAL_GL_UNIFORM_ARRAY_STRIDE, blockArrayStrideList.data());
|
||
|
||
gl.fGetActiveUniformsiv(
|
||
prog, activeIndices.size(), activeIndices.data(),
|
||
LOCAL_GL_UNIFORM_MATRIX_STRIDE, blockMatrixStrideList.data());
|
||
|
||
gl.fGetActiveUniformsiv(
|
||
prog, activeIndices.size(), activeIndices.data(),
|
||
LOCAL_GL_UNIFORM_IS_ROW_MAJOR, blockIsRowMajorList.data());
|
||
}
|
||
|
||
for (const auto i : IntegerRange(count)) {
|
||
GLsizei lengthWithoutNull = 0;
|
||
GLint elemCount = 0; // `size`
|
||
GLenum elemType = 0; // `type`
|
||
gl.fGetActiveUniform(prog, i, stringBuffer.size(), &lengthWithoutNull,
|
||
&elemCount, &elemType, stringBuffer.data());
|
||
if (!elemType) {
|
||
const auto error = gl.fGetError();
|
||
if (error != LOCAL_GL_CONTEXT_LOST) {
|
||
gfxCriticalError() << "Failed to do glGetActiveUniform: " << error;
|
||
}
|
||
return;
|
||
}
|
||
auto mappedName = std::string(stringBuffer.data(), lengthWithoutNull);
|
||
|
||
// Get true name
|
||
|
||
auto baseMappedName = mappedName;
|
||
|
||
const bool isArray = [&]() {
|
||
const auto maybe = webgl::ParseIndexed(mappedName);
|
||
if (maybe) {
|
||
MOZ_ASSERT(maybe->index == 0);
|
||
baseMappedName = std::move(maybe->name);
|
||
return true;
|
||
}
|
||
return false;
|
||
}();
|
||
|
||
const auto userName = fnUnmapName(mappedName);
|
||
|
||
// -
|
||
|
||
webgl::ActiveUniformInfo info;
|
||
info.elemType = elemType;
|
||
info.elemCount = static_cast<uint32_t>(elemCount);
|
||
info.name = userName;
|
||
info.block_index = blockIndexList[i];
|
||
info.block_offset = blockOffsetList[i];
|
||
info.block_arrayStride = blockArrayStrideList[i];
|
||
info.block_matrixStride = blockMatrixStrideList[i];
|
||
info.block_isRowMajor = bool(blockIsRowMajorList[i]);
|
||
|
||
#ifdef DUMP_MakeLinkResult
|
||
printf_stderr("[uniform %u/%u] %s->%s\n", i + 1, count,
|
||
userName.c_str(), mappedName.c_str());
|
||
#endif
|
||
|
||
// Get uniform locations
|
||
{
|
||
auto locName = baseMappedName;
|
||
const auto baseLength = locName.size();
|
||
for (const auto i : IntegerRange(info.elemCount)) {
|
||
if (isArray) {
|
||
locName.erase(
|
||
baseLength); // Erase previous [N], but retain capacity.
|
||
locName += '[';
|
||
locName += std::to_string(i);
|
||
locName += ']';
|
||
}
|
||
const auto loc = gl.fGetUniformLocation(prog, locName.c_str());
|
||
if (loc != -1) {
|
||
info.locByIndex[i] = static_cast<uint32_t>(loc);
|
||
#ifdef DUMP_MakeLinkResult
|
||
printf_stderr(" [%u] @%i\n", i, loc);
|
||
#endif
|
||
}
|
||
}
|
||
} // anon
|
||
|
||
ret.activeUniforms.push_back(std::move(info));
|
||
} // for i
|
||
} // anon
|
||
|
||
if (webgl2) {
|
||
// -------------------------------------
|
||
// active uniform blocks
|
||
{
|
||
const auto count = fnGetProgramui(LOCAL_GL_ACTIVE_UNIFORM_BLOCKS);
|
||
ret.activeUniformBlocks.reserve(count);
|
||
|
||
for (const auto i : IntegerRange(count)) {
|
||
GLsizei lengthWithoutNull = 0;
|
||
gl.fGetActiveUniformBlockName(prog, i, stringBuffer.size(),
|
||
&lengthWithoutNull,
|
||
stringBuffer.data());
|
||
const auto mappedName =
|
||
std::string(stringBuffer.data(), lengthWithoutNull);
|
||
const auto userName = fnUnmapName(mappedName);
|
||
|
||
// -
|
||
|
||
auto info = webgl::ActiveUniformBlockInfo{userName};
|
||
GLint val = 0;
|
||
|
||
gl.fGetActiveUniformBlockiv(prog, i, LOCAL_GL_UNIFORM_BLOCK_DATA_SIZE,
|
||
&val);
|
||
info.dataSize = static_cast<uint32_t>(val);
|
||
|
||
gl.fGetActiveUniformBlockiv(
|
||
prog, i, LOCAL_GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS, &val);
|
||
info.activeUniformIndices.resize(val);
|
||
gl.fGetActiveUniformBlockiv(
|
||
prog, i, LOCAL_GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES,
|
||
reinterpret_cast<GLint*>(info.activeUniformIndices.data()));
|
||
|
||
gl.fGetActiveUniformBlockiv(
|
||
prog, i, LOCAL_GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER,
|
||
&val);
|
||
info.referencedByVertexShader = bool(val);
|
||
|
||
gl.fGetActiveUniformBlockiv(
|
||
prog, i, LOCAL_GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER,
|
||
&val);
|
||
info.referencedByFragmentShader = bool(val);
|
||
|
||
ret.activeUniformBlocks.push_back(std::move(info));
|
||
} // for i
|
||
} // anon
|
||
|
||
// -------------------------------------
|
||
// active tf varyings
|
||
{
|
||
const auto count = fnGetProgramui(LOCAL_GL_TRANSFORM_FEEDBACK_VARYINGS);
|
||
ret.activeTfVaryings.reserve(count);
|
||
|
||
for (const auto i : IntegerRange(count)) {
|
||
GLsizei lengthWithoutNull = 0;
|
||
GLsizei elemCount = 0; // `size`
|
||
GLenum elemType = 0; // `type`
|
||
gl.fGetTransformFeedbackVarying(prog, i, stringBuffer.size(),
|
||
&lengthWithoutNull, &elemCount,
|
||
&elemType, stringBuffer.data());
|
||
const auto mappedName =
|
||
std::string(stringBuffer.data(), lengthWithoutNull);
|
||
const auto userName = fnUnmapName(mappedName);
|
||
|
||
ret.activeTfVaryings.push_back(
|
||
{elemType, static_cast<uint32_t>(elemCount), userName});
|
||
}
|
||
}
|
||
} // if webgl2
|
||
}();
|
||
return ret;
|
||
}
|
||
|
||
nsCString ToCString(const std::string& s) {
|
||
return nsCString(s.data(), s.size());
|
||
}
|
||
|
||
webgl::CompileResult WebGLContext::GetCompileResult(
|
||
const WebGLShader& shader) const {
|
||
webgl::CompileResult ret;
|
||
[&]() {
|
||
ret.pending = false;
|
||
const auto& info = shader.CompileResults();
|
||
if (!info) return;
|
||
if (!info->mValid) {
|
||
ret.log = info->mInfoLog.c_str();
|
||
return;
|
||
}
|
||
// TODO: These could be large and should be made fallible.
|
||
ret.translatedSource = ToCString(info->mObjectCode);
|
||
ret.log = ToCString(shader.CompileLog());
|
||
if (!shader.IsCompiled()) return;
|
||
ret.success = true;
|
||
}();
|
||
return ret;
|
||
}
|
||
|
||
webgl::LinkResult WebGLContext::GetLinkResult(const WebGLProgram& prog) const {
|
||
webgl::LinkResult ret;
|
||
[&]() {
|
||
ret.pending = false; // Link status polling not yet implemented.
|
||
ret.log = ToCString(prog.LinkLog());
|
||
const auto& info = prog.LinkInfo();
|
||
if (!info) return;
|
||
ret.success = true;
|
||
ret.active = info->active;
|
||
ret.tfBufferMode = info->transformFeedbackBufferMode;
|
||
}();
|
||
return ret;
|
||
}
|
||
|
||
// -
|
||
|
||
GLint WebGLContext::GetFragDataLocation(const WebGLProgram& prog,
|
||
const std::string& userName) const {
|
||
const auto err = CheckGLSLVariableName(IsWebGL2(), userName);
|
||
if (err) {
|
||
GenerateError(err->type, "%s", err->info.c_str());
|
||
return -1;
|
||
}
|
||
|
||
const auto& info = prog.LinkInfo();
|
||
if (!info) return -1;
|
||
const auto& nameMap = info->nameMap;
|
||
|
||
const auto parts = ExplodeName(userName);
|
||
|
||
std::ostringstream ret;
|
||
for (const auto& part : parts) {
|
||
const auto maybe = MaybeFind(nameMap, part);
|
||
if (maybe) {
|
||
ret << *maybe;
|
||
} else {
|
||
ret << part;
|
||
}
|
||
}
|
||
const auto mappedName = ret.str();
|
||
|
||
if (gl->WorkAroundDriverBugs() && gl->IsMesa()) {
|
||
// Mesa incorrectly generates INVALID_OPERATION for gl_ prefixes here.
|
||
if (mappedName.find("gl_") == 0) {
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
return gl->fGetFragDataLocation(prog.mGLName, mappedName.c_str());
|
||
}
|
||
|
||
// -
|
||
|
||
WebGLContextBoundObject::WebGLContextBoundObject(WebGLContext* webgl)
|
||
: mContext(webgl) {}
|
||
|
||
// -
|
||
|
||
Result<webgl::ExplicitPixelPackingState, std::string>
|
||
webgl::ExplicitPixelPackingState::ForUseWith(
|
||
const webgl::PixelPackingState& stateOrZero, const GLenum target,
|
||
const uvec3& subrectSize, const webgl::PackingInfo& pi,
|
||
const Maybe<size_t> bytesPerRowStrideOverride) {
|
||
auto state = stateOrZero;
|
||
|
||
if (!IsTexTarget3D(target)) {
|
||
state.skipImages = 0;
|
||
state.imageHeight = 0;
|
||
}
|
||
if (!state.rowLength) {
|
||
state.rowLength = subrectSize.x;
|
||
}
|
||
if (!state.imageHeight) {
|
||
state.imageHeight = subrectSize.y;
|
||
}
|
||
|
||
// -
|
||
|
||
const auto mpii = PackingInfoInfo::For(pi);
|
||
if (!mpii) {
|
||
const auto text =
|
||
nsPrintfCString("Invalid pi: { 0x%x, 0x%x}", pi.format, pi.type);
|
||
return Err(mozilla::ToString(text));
|
||
}
|
||
const auto pii = *mpii;
|
||
const auto bytesPerPixel = pii.BytesPerPixel();
|
||
|
||
const auto ElemsPerRowStride = [&]() {
|
||
// GLES 3.0.6 p116:
|
||
// p: `Elem*` pointer to the first element of the first row
|
||
// N: row number, starting at 0
|
||
// l: groups (pixels) per row
|
||
// n: elements per group (pixel) in [1,2,3,4]
|
||
// s: bytes per element in [1,2,4,8]
|
||
// a: UNPACK_ALIGNMENT in [1,2,4,8]
|
||
// Pointer to first element of Nth row: p + N*k
|
||
// k(s>=a): n*l
|
||
// k(s<a): a/s * ceil(s*n*l/a)
|
||
const auto n__elemsPerPixel = pii.elementsPerPixel;
|
||
const auto l__pixelsPerRow = state.rowLength;
|
||
const auto a__alignment = state.alignmentInTypeElems;
|
||
const auto s__bytesPerElem = pii.bytesPerElement;
|
||
|
||
const auto nl = CheckedInt<size_t>(n__elemsPerPixel) * l__pixelsPerRow;
|
||
auto k__elemsPerRowStride = nl;
|
||
if (s__bytesPerElem < a__alignment) {
|
||
// k = a/s * ceil(s*n*l/a)
|
||
k__elemsPerRowStride =
|
||
a__alignment / s__bytesPerElem *
|
||
((nl * s__bytesPerElem + a__alignment - 1) / a__alignment);
|
||
}
|
||
return k__elemsPerRowStride;
|
||
};
|
||
|
||
// -
|
||
|
||
if (bytesPerRowStrideOverride) { // E.g. HTMLImageElement
|
||
const size_t bytesPerRowStrideRequired = *bytesPerRowStrideOverride;
|
||
// We have to reverse-engineer an ALIGNMENT and ROW_LENGTH for this.
|
||
|
||
// GL does this in elems not bytes, so we should too.
|
||
MOZ_RELEASE_ASSERT(bytesPerRowStrideRequired % pii.bytesPerElement == 0);
|
||
const auto elemsPerRowStrideRequired =
|
||
bytesPerRowStrideRequired / pii.bytesPerElement;
|
||
|
||
state.rowLength = bytesPerRowStrideRequired / bytesPerPixel;
|
||
state.alignmentInTypeElems = 8;
|
||
while (true) {
|
||
const auto elemPerRowStride = ElemsPerRowStride();
|
||
if (elemPerRowStride.isValid() &&
|
||
elemPerRowStride.value() == elemsPerRowStrideRequired) {
|
||
break;
|
||
}
|
||
state.alignmentInTypeElems /= 2;
|
||
if (!state.alignmentInTypeElems) {
|
||
const auto text = nsPrintfCString(
|
||
"No valid alignment found: pi: { 0x%x, 0x%x},"
|
||
" bytesPerRowStrideRequired: %zu",
|
||
pi.format, pi.type, bytesPerRowStrideRequired);
|
||
return Err(mozilla::ToString(text));
|
||
}
|
||
}
|
||
}
|
||
|
||
// -
|
||
|
||
const auto usedPixelsPerRow =
|
||
CheckedInt<size_t>(state.skipPixels) + subrectSize.x;
|
||
if (!usedPixelsPerRow.isValid() ||
|
||
usedPixelsPerRow.value() > state.rowLength) {
|
||
return Err("UNPACK_SKIP_PIXELS + width > UNPACK_ROW_LENGTH.");
|
||
}
|
||
|
||
if (subrectSize.y > state.imageHeight) {
|
||
return Err("height > UNPACK_IMAGE_HEIGHT.");
|
||
}
|
||
// The spec doesn't bound SKIP_ROWS + height <= IMAGE_HEIGHT, unfortunately.
|
||
|
||
// -
|
||
|
||
auto metrics = Metrics{};
|
||
|
||
metrics.usedSize = subrectSize;
|
||
metrics.bytesPerPixel = BytesPerPixel(pi);
|
||
|
||
// -
|
||
|
||
const auto elemsPerRowStride = ElemsPerRowStride();
|
||
const auto bytesPerRowStride = pii.bytesPerElement * elemsPerRowStride;
|
||
if (!bytesPerRowStride.isValid()) {
|
||
return Err("ROW_LENGTH or width too large for packing.");
|
||
}
|
||
metrics.bytesPerRowStride = bytesPerRowStride.value();
|
||
|
||
// -
|
||
|
||
const auto firstImageTotalRows =
|
||
CheckedInt<size_t>(state.skipRows) + metrics.usedSize.y;
|
||
const auto totalImages =
|
||
CheckedInt<size_t>(state.skipImages) + metrics.usedSize.z;
|
||
auto totalRows = CheckedInt<size_t>(0);
|
||
if (metrics.usedSize.y && metrics.usedSize.z) {
|
||
totalRows = firstImageTotalRows + state.imageHeight * (totalImages - 1);
|
||
}
|
||
if (!totalRows.isValid()) {
|
||
return Err(
|
||
"SKIP_ROWS, height, IMAGE_HEIGHT, SKIP_IMAGES, or depth too large for "
|
||
"packing.");
|
||
}
|
||
metrics.totalRows = totalRows.value();
|
||
|
||
// -
|
||
|
||
const auto totalBytesStrided = totalRows * metrics.bytesPerRowStride;
|
||
if (!totalBytesStrided.isValid()) {
|
||
return Err("Total byte count too large for packing.");
|
||
}
|
||
metrics.totalBytesStrided = totalBytesStrided.value();
|
||
|
||
metrics.totalBytesUsed = metrics.totalBytesStrided;
|
||
if (metrics.usedSize.x && metrics.usedSize.y && metrics.usedSize.z) {
|
||
const auto usedBytesPerRow =
|
||
usedPixelsPerRow.value() * metrics.bytesPerPixel;
|
||
metrics.totalBytesUsed -= metrics.bytesPerRowStride;
|
||
metrics.totalBytesUsed += usedBytesPerRow;
|
||
}
|
||
|
||
// -
|
||
|
||
return {{state, metrics}};
|
||
}
|
||
|
||
} // namespace mozilla
|