From: Ian Romanick <ian.d.roman...@intel.com>
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.roman...@intel.com>
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_defines.h | 1 +
src/mesa/drivers/dri/i965/brw_gs_state.c | 2 ++
src/mesa/drivers/dri/i965/gen6_clip_state.c | 3 ++-
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h
b/src/mesa/drivers/dri/i965/brw_defines.h
index fe5a147..656179e 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -1537,6 +1537,7 @@ 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) */
diff --git a/src/mesa/drivers/dri/i965/brw_gs_state.c
b/src/mesa/drivers/dri/i965/brw_gs_state.c
index 9532614..d0c92fa 100644
--- a/src/mesa/drivers/dri/i965/brw_gs_state.c
+++ b/src/mesa/drivers/dri/i965/brw_gs_state.c
@@ -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;
}
diff --git a/src/mesa/drivers/dri/i965/gen6_clip_state.c
b/src/mesa/drivers/dri/i965/gen6_clip_state.c
index e4dc278..3499e37 100644
--- a/src/mesa/drivers/dri/i965/gen6_clip_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_clip_state.c
@@ -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();
}
--
1.8.1.4
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