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Optimize time spent in GPU driver for GPU cache updates. #1390

Merged
merged 1 commit into from Jun 20, 2017
Merged

Optimize time spent in GPU driver for GPU cache updates. #1390

merged 1 commit into from Jun 20, 2017
+182 −60

Commits on Jun 16, 2017

  1. Optimize time spent in GPU driver for GPU cache updates. 

    We keep a shadow copy of the GPU cache data in the render thread.
After all updates (patches) have been applied for this frame, scan
the rows of the texture for rows that have been modified.

Upload each dirty row to the GPU via a PBO to ensure that there
are no CPU-side stalls.

In the future, there's several more optimizations that can be made:
 * Batch consecutive row updates into a single PBO / upload call.
 * Perhaps track start/end of each row, to avoid a full row update for small changes.
    @gw3583
    gw3583 committed Jun 16, 2017
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