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shairai / angleproject

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D3D11 system memory storage wrongly deleted #965

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?

1. Create a buffer with GL_DYNAMIC_DRAW.
2. Update the data with glBufferSubData.
3. Bind the buffer has a UBO and check the buffer’s content with a draw call.
4. Go to 2.

After a few iteration, ANGLE will use old data and ignore the new data.

What’s happening is that ANGLE tries to delete the system memory buffer used 
for upload (in markBufferUsage()). Unfortunately the system memory buffer is 
likely to be the only buffer containing the most recent data resulting in data 
loss.

Original issue reported on code.google.com by Gregory....@imgtec.com on 2 Apr 2015 at 3:54