forked from mirrors/gecko-dev
7b81925deb
Source-Repo: https://github.com/servo/servo Source-Revision: c1ed4bb2d5ed6a4f9967215620d2105cda5ef76a --HG-- extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear extra : subtree_revision : 4f69ae87c412562cfab10b101d17dceab6c387ee
97 lines
2.9 KiB
Rust
97 lines
2.9 KiB
Rust
/* 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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use dom::bindings::reflector::DomObject;
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use dom::bindings::root::{DomRoot, MutNullableDom};
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use dom::bindings::trace::JSTraceable;
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use dom::webglrenderingcontext::WebGLRenderingContext;
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use js::jsapi::JSObject;
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use malloc_size_of::MallocSizeOf;
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use std::any::Any;
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use std::ptr::NonNull;
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use super::{WebGLExtension, WebGLExtensions, WebGLExtensionSpec};
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/// Trait used internally by WebGLExtensions to store and
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/// handle the different WebGL extensions in a common list.
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pub trait WebGLExtensionWrapper: JSTraceable + MallocSizeOf {
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fn instance_or_init(&self,
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ctx: &WebGLRenderingContext,
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ext: &WebGLExtensions)
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-> NonNull<JSObject>;
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fn spec(&self) -> WebGLExtensionSpec;
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fn is_supported(&self, &WebGLExtensions) -> bool;
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fn is_enabled(&self) -> bool;
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fn enable(&self, ext: &WebGLExtensions);
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fn name(&self) -> &'static str;
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fn as_any(&self) -> &Any;
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}
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#[must_root]
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#[derive(JSTraceable, MallocSizeOf)]
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pub struct TypedWebGLExtensionWrapper<T: WebGLExtension> {
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extension: MutNullableDom<T::Extension>
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}
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/// Typed WebGL Extension implementation.
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/// Exposes the exact MutNullableDom<DOMObject> type defined by the extension.
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impl<T: WebGLExtension> TypedWebGLExtensionWrapper<T> {
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pub fn new() -> TypedWebGLExtensionWrapper<T> {
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TypedWebGLExtensionWrapper {
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extension: MutNullableDom::new(None)
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}
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}
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}
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impl<T> WebGLExtensionWrapper for TypedWebGLExtensionWrapper<T>
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where T: WebGLExtension + JSTraceable + MallocSizeOf + 'static {
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#[allow(unsafe_code)]
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fn instance_or_init(&self,
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ctx: &WebGLRenderingContext,
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ext: &WebGLExtensions)
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-> NonNull<JSObject> {
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let mut enabled = true;
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let extension = self.extension.or_init(|| {
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enabled = false;
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T::new(ctx)
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});
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if !enabled {
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self.enable(ext);
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}
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unsafe {
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NonNull::new_unchecked(extension.reflector().get_jsobject().get())
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}
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}
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fn spec(&self) -> WebGLExtensionSpec {
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T::spec()
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}
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fn is_supported(&self, ext: &WebGLExtensions) -> bool {
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self.is_enabled() || T::is_supported(ext)
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}
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fn is_enabled(&self) -> bool {
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self.extension.get().is_some()
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}
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fn enable(&self, ext: &WebGLExtensions) {
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T::enable(ext);
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}
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fn name(&self) -> &'static str {
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T::name()
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}
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fn as_any<'a>(&'a self) -> &'a Any {
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self
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}
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}
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impl<T> TypedWebGLExtensionWrapper<T>
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where T: WebGLExtension + JSTraceable + MallocSizeOf + 'static
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{
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pub fn dom_object(&self) -> Option<DomRoot<T::Extension>> {
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self.extension.get()
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}
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}
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