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webgl: Support preserveDrawingBuffer.

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This commit is contained in:
Josh Matthews 2020-07-28 13:08:32 -04:00
parent 08328c22d6
commit a5e488bc2c
6 changed files with 29 additions and 21 deletions
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34
components/canvas/webgl_thread.rs
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@ -827,22 +827,30 @@ impl WebGLThread {
debug!("Swapping {:?}", context_id);
swap_chain
.swap_buffers(&mut self.device, &mut data.ctx)
.swap_buffers(
&mut self.device,
&mut data.ctx,
if data.attributes.preserve_drawing_buffer {
surfman_chains::PreserveBuffer::Yes(&*data.gl)
} else {
surfman_chains::PreserveBuffer::No
},
)
.unwrap();
debug_assert_eq!(data.gl.get_error(), gl::NO_ERROR);
// TODO: if preserveDrawingBuffer is true, then blit the front buffer to the back buffer
// https://github.com/servo/servo/issues/24604
debug!("Clearing {:?}", context_id);
let alpha = data
.state
.requested_flags
.contains(ContextAttributeFlags::ALPHA);
let clear_color = [0.0, 0.0, 0.0, !alpha as i32 as f32];
swap_chain
.clear_surface(&mut self.device, &mut data.ctx, &*data.gl, clear_color)
.unwrap();
debug_assert_eq!(data.gl.get_error(), gl::NO_ERROR);
if !data.attributes.preserve_drawing_buffer {
debug!("Clearing {:?}", context_id);
let alpha = data
.state
.requested_flags
.contains(ContextAttributeFlags::ALPHA);
let clear_color = [0.0, 0.0, 0.0, !alpha as i32 as f32];
swap_chain
.clear_surface(&mut self.device, &mut data.ctx, &*data.gl, clear_color)
.unwrap();
debug_assert_eq!(data.gl.get_error(), gl::NO_ERROR);
}
// Rebind framebuffers as appropriate.
debug!("Rebinding {:?}", context_id);