I've done a bit of job to get this done. Right now readback is still used, but we have a `LayerId` -> `CanvasRenderer` map on the paint task, that we can use to get rid of that.
I'd want review, to see if this is a good approach (I know it's not the initial `CanvasId` -> renderer approach, but it's pretty similar, since a canvas involves a `PaintLayer`).
I had to do a bit of refactoring to avoid cyclic dependencies between canvas and gfx. I'd want you to review them too.
It's mergeable and doesn't break any tests :P
Some of my main concerns:
* Does the canvas render really need to be behind an `Arc<Mutex<T>>`?
* I can't clone a `NativeSurface` right now (that's why the `SendNativeSurface()` msg is unimplemented in the WebGL task). It should be easy to add that to rust-layers, supposing the caller is responsible to mark it as non-leaking, any reason to not do it?
cc @jdm @pcwalton
Source-Repo: https://github.com/servo/servo
Source-Revision: ad53e95080144485e74cd9b9d48ce75e20de4e36
--HG--
rename : servo/components/gfx/color.rs => servo/components/gfx_traits/color.rs
GitHub doesn't allow me to reopen#5769, so I created this.
Sorry about the merge fail, my bad :/
cc/ @jdm @dmarcos
---
This PR uses customized GL context creation code, right now only working under Linux, so I expect the clearcolor test to fail on other platforms.
It addresses some other problems:
* Propagates context creation error to the top, returning null if not found.
* Uses GLContextAttributes, which will allow us to write WebGLContextAttributes easily.
* Doesn't allow a 2d context and a WebGL context coexist.
* Panics when resizing the context to larger dimensions (to be fixed soon, but better than blindly allowing it).
Removes some unused dependencies
Source-Repo: https://github.com/servo/servo
Source-Revision: 9f2ad9376eaf598898387ea2c26f48c3ceb0330d
@jdm @ecoal95 I'm working on making VR happen in the Browser and I want to bring to Servo the [webVR APIs](https://github.com/MozVR/webvr-spec/blob/master/webvr.idl) we already have in Gecko. Before anything happens we need a working implementation of WebGL (and also the [fullscreen API](https://fullscreen.spec.whatwg.org/)). My implementation is very basic and probably naive (I just recently started to contribute to Servo). My patch is just a starting point:
- It only implements ```clearColor``` and ```clear``` methods of the [WebGL spec](https://www.khronos.org/registry/webgl/specs/latest/).
- It uses the readback strategy that ```canvasRenderingContext2D``` is using (The webgl task paints stuff independently on it's own buffer and the compositor task request the pixels back to the webgl task when it needs them) I'm sure there are much better ways to handle this. Latency and FPS are critical in VR so we have to figure out the fastest way to push pixels to the screen. I've read something about layerizing the canvas but I'm still not sure what that even means :)
- There's an included test you can try ```./mach run tests/ref/webgl-context/clearcolor.html```
@ecoal95 I know you'll be working on this for the next three months. With a foundation in place we will be able to make quick progress in parallel. This is exciting!
Source-Repo: https://github.com/servo/servo
Source-Revision: e4b620ea54c94e03095e4108bce94ec750416bba
