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i965: Set the maximum VPIndex

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At various stages the hardware clamps the gl_ViewportIndex to these
values.  Setting them to zero effectively makes gl_ViewportIndex be
ignored.  This is acutally useful in blorp (so that we don't have to
modify all of the viewport / scissor state).

v2: Use INTEL_MASK to create GEN6_CLIP_MAX_VP_INDEX_MASK.  Suggested by
Ken.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Ian Romanick 2014-01-10 13:43:24 -08:00
parent 9ef16befd0
commit 37f65b0751
3 changed files with 5 additions and 1 deletions
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1
src/mesa/drivers/dri/i965/brw_defines.h
View file

@ -1544,6 +1544,7 @@ enum brw_message_target {
# define GEN6_CLIP_MIN_POINT_WIDTH_SHIFT 17
# define GEN6_CLIP_MAX_POINT_WIDTH_SHIFT 6
# define GEN6_CLIP_FORCE_ZERO_RTAINDEX (1 << 5)
# define GEN6_CLIP_MAX_VP_INDEX_MASK INTEL_MASK(3, 0)
#define _3DSTATE_SF 0x7813 /* GEN6+ */
/* DW1 (for gen6) */

2
src/mesa/drivers/dri/i965/brw_gs_state.c
View file

@ -83,6 +83,8 @@ brw_upload_gs_unit(struct brw_context *brw)
if (unlikely(INTEL_DEBUG & DEBUG_STATS))
gs->thread4.stats_enable = 1;
gs->gs6.max_vp_index = brw->ctx.Const.MaxViewports - 1;
brw->state.dirty.cache |= CACHE_NEW_FF_GS_UNIT;
}

3
src/mesa/drivers/dri/i965/gen6_clip_state.c
View file

@ -121,7 +121,8 @@ upload_clip_state(struct brw_context *brw)
dw2);
OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
(fb->MaxNumLayers > 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX));
(fb->MaxNumLayers > 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX) |
((ctx->Const.MaxViewports - 1) & GEN6_CLIP_MAX_VP_INDEX_MASK));
ADVANCE_BATCH();
}