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webgl: Protect against GL error on glBindRenderbuffer(deleted rbo).

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On a GLES or compatibility underlying GL context, we were fine because
an underlying renderbuffer object would just get re-created, and
nothing too bad happened because we aren't tracking the currently
bound renderbuffer at the DOM level.  However, on a desktop GL core
context, binding non-genned or deleted names is an error.

Fixes a crash in object-deletion-behavior.html.
This commit is contained in:
Eric Anholt 2016-08-15 01:02:36 -07:00
parent 545ae86dff
commit 6ec2c41df8
1 changed files with 13 additions and 7 deletions
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20
components/script/dom/webglrenderingcontext.rs
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@ -705,13 +705,19 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
return self.webgl_error(InvalidEnum);
}
if let Some(renderbuffer) = renderbuffer {
renderbuffer.bind(target)
} else {
// Unbind the currently bound renderbuffer
self.ipc_renderer
.send(CanvasMsg::WebGL(WebGLCommand::BindRenderbuffer(target, None)))
.unwrap()
match renderbuffer {
// Implementations differ on what to do in the deleted
// case: Chromium currently unbinds, and Gecko silently
// returns. The conformance tests don't cover this case.
Some(renderbuffer) if !renderbuffer.is_deleted() => {
renderbuffer.bind(target)
}
_ => {
// Unbind the currently bound renderbuffer
self.ipc_renderer
.send(CanvasMsg::WebGL(WebGLCommand::BindRenderbuffer(target, None)))
.unwrap()
}
}
}