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i965: Implement guardband clipping on Ivybridge.

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Improves performance in Citybench:
- 320x240: 9.19589% +/- 0.557621%
- 1280x480: 3.90797% +/- 0.774429%

No apparent difference in OpenArena.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2012-05-04 17:06:39 -07:00
parent 85cd30406f
commit 610910a66d
2 changed files with 15 additions and 5 deletions
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1
src/mesa/drivers/dri/i965/gen7_clip_state.c
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@ -101,6 +101,7 @@ upload_clip_state(struct brw_context *brw)
GEN6_CLIP_MODE_NORMAL |
nonperspective_barycentric_enable_flag |
GEN6_CLIP_XY_TEST |
GEN6_CLIP_GB_TEST |
userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT |
depth_clamp |
provoking);

19
src/mesa/drivers/dri/i965/gen7_viewport_state.c
View file

@ -43,11 +43,20 @@ gen7_upload_sf_clip_viewport(struct brw_context *brw)
/* Also assign to clip.vp_offset in case something uses it. */
brw->clip.vp_offset = brw->sf.vp_offset;
/* Disable guardband clipping (see gen6_viewport_state.c for rationale). */
vp->guardband.xmin = -1.0;
vp->guardband.xmax = 1.0;
vp->guardband.ymin = -1.0;
vp->guardband.ymax = 1.0;
/* According to the "Vertex X,Y Clamping and Quantization" section of the
* Strips and Fans documentation, Ivybridge and later don't have a maximum
* post-clamp delta. However, the guardband extent must fit in [-32K, 32K)
* which gives us a maximum size of 64K. Use 65000 rather than 65536 to be
* somewhat cautious---make the guardband slightly smaller than the maximum.
*/
const float maximum_guardband_extent = 65000;
float gbx = maximum_guardband_extent / (float) ctx->Viewport.Width;
float gby = maximum_guardband_extent / (float) ctx->Viewport.Height;
vp->guardband.xmin = -gbx;
vp->guardband.xmax = gbx;
vp->guardband.ymin = -gby;
vp->guardband.ymax = gby;
/* _NEW_BUFFERS */
if (render_to_fbo) {