[Mesa-dev] [PATCH 0/4] BDW viewport extents + misc

[Ben Widawsky]

The patch commit messages and comments within the diffs explain the intricacies
of viewport extents and clipping. So rather, here is the data for these
patches. All of the following is for a Broadwell system (which introduced
viewport extents).

EGYPT PERF
==========
No change

WARSOW PERF
===========
No change

piglit
======
viewport extents only:
spec/ARB_viewport_array/render-scissor/Render multi-viewport scissor test: fail pass
spec/glsl-1.30/execution/built-in-functions/vs-max-ivec4-int: fail pass
spec/ARB_viewport_array/render-scissor/Render multi-scissor rectangles: fail pass
spec/glsl-1.50/execution/geometry/max-input-components: fail pass

viewport extents + gb clipping:
spec/ARB_viewport_array/render-scissor/Render multi-viewport scissor test: fail pass
spec/glsl-1.30/execution/built-in-functions/vs-max-ivec4-int: fail pass
spec/ARB_viewport_array/render-scissor/Render multi-scissor rectangles: fail pass

all:
spec/ARB_viewport_array/render-scissor/Render multi-viewport scissor test: fail pass
spec/glsl-1.30/execution/built-in-functions/vs-max-ivec4-int: fail pass
spec/ARB_viewport_array/render-scissor/Render multi-scissor rectangles: fail pass

As you can observe, there are no wins found here other than conformance. Given
our understanding of the hardware, we expect these patches to produce a
performance improvements for certain applications (specifically those which
define viewports smaller than the drawing rectangle, but some other caveats
apply on top of that).

Ben Widawsky (4):
  i965/guardband: Improve comments for guardband clipping
  i965: Viewport extents on GEN8
  i965/guardband: Enable for all viewport dimensions (GEN8+)
  i965/clip: Removing scissor atom

 src/mesa/drivers/dri/i965/gen6_clip_state.c     | 29 +++++++++-----
 src/mesa/drivers/dri/i965/gen8_viewport_state.c | 52 ++++++++++++++++++-------
 2 files changed, 57 insertions(+), 24 deletions(-)

-- 
2.0.3