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webgl: Add support for getParameter(GL_FRAMEBUFFER_BINDING).

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To do this, we need to keep a map of GL names (encapsulated as
WebGLFramebufferId) to WebGLFramebuffer objects so that we can return
the right type.

Fixes #12852
This commit is contained in:
Eric Anholt 2016-08-12 23:50:57 -07:00
parent a21bbb78c4
commit 6651db8b56
5 changed files with 44 additions and 136 deletions
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24
components/script/dom/webglrenderingcontext.rs
View file

@ -82,6 +82,7 @@ pub struct WebGLRenderingContext {
#[ignore_heap_size_of = "Defined in webrender_traits"]
last_error: Cell<Option<WebGLError>>,
texture_unpacking_settings: Cell<TextureUnpacking>,
bound_framebuffer: MutNullableHeap<JS<WebGLFramebuffer>>,
bound_texture_2d: MutNullableHeap<JS<WebGLTexture>>,
bound_texture_cube_map: MutNullableHeap<JS<WebGLTexture>>,
bound_buffer_array: MutNullableHeap<JS<WebGLBuffer>>,
@ -111,6 +112,7 @@ impl WebGLRenderingContext {
canvas: JS::from_ref(canvas),
last_error: Cell::new(None),
texture_unpacking_settings: Cell::new(CONVERT_COLORSPACE),
bound_framebuffer: MutNullableHeap::new(None),
bound_texture_2d: MutNullableHeap::new(None),
bound_texture_cube_map: MutNullableHeap::new(None),
bound_buffer_array: MutNullableHeap::new(None),
@ -511,6 +513,22 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
#[allow(unsafe_code)]
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.3
fn GetParameter(&self, cx: *mut JSContext, parameter: u32) -> JSVal {
// Handle the GL_FRAMEBUFFER_BINDING without going all the way
// to the GL, since we would just need to map back from GL's
// returned ID to the WebGLFramebuffer we're tracking.
match parameter {
constants::FRAMEBUFFER_BINDING => {
rooted!(in(cx) let mut rval = NullValue());
if let Some(bound_fb) = self.bound_framebuffer.get() {
unsafe {
bound_fb.to_jsval(cx, rval.handle_mut());
}
}
return rval.get()
}
_ => {}
}
let (sender, receiver) = ipc::channel().unwrap();
self.ipc_renderer
.send(CanvasMsg::WebGL(WebGLCommand::GetParameter(parameter, sender)))
@ -671,6 +689,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
return self.webgl_error(InvalidOperation);
}
self.bound_framebuffer.set(framebuffer);
if let Some(framebuffer) = framebuffer {
framebuffer.bind(target)
} else {
@ -1083,6 +1102,11 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.6
fn DeleteFramebuffer(&self, framebuffer: Option<&WebGLFramebuffer>) {
if let Some(framebuffer) = framebuffer {
if let Some(bound_fb) = self.bound_framebuffer.get() {
if bound_fb.id() == framebuffer.id() {
self.bound_framebuffer.set(None);
}
}
framebuffer.delete()
}
}