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Bug 1178999 - Do initial backbuffer clear lazily. - r=kamidphish

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This commit is contained in:
Jeff Gilbert 2015-07-01 14:28:32 -07:00
parent 0af40bbc75
commit a70ee72603
1 changed files with 8 additions and 7 deletions
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15
dom/canvas/WebGLContext.cpp
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@ -821,8 +821,9 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
uint32_t width = signedWidth;
uint32_t height = signedHeight;
// Early success return cases
GetCanvas()->InvalidateCanvas();
// We always want to get a recomposite after resize. (though not necessaryily a
// Present!)
Invalidate();
// Zero-sized surfaces can cause problems.
if (width == 0)
@ -845,6 +846,8 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
MakeContextCurrent();
// If we've already drawn, we should commit the current buffer.
// If we do not do this, we're likely to get a bunch of rendered frames that never
// make it to the screen if we're being continuously resized.
PresentScreenBuffer();
if (IsContextLost()) {
@ -971,11 +974,9 @@ WebGLContext::SetDimensions(int32_t signedWidth, int32_t signedHeight)
AssertCachedBindings();
AssertCachedState();
// Clear immediately, because we need to present the cleared initial
// buffer.
// Mark for lazy clearing and presentation, so if nothing is drawn immediately, we get
// the proper blank frame being Presented.
mBackbufferNeedsClear = true;
ClearBackbufferIfNeeded();
mShouldPresent = true;
MOZ_ASSERT(gl->Caps().color);
@ -1472,7 +1473,7 @@ WebGLContext::PresentScreenBuffer()
if (!mShouldPresent) {
return false;
}
MOZ_ASSERT(!mBackbufferNeedsClear);
ClearBackbufferIfNeeded();
gl->MakeCurrent();