In gen6 we need to compute the primitive count in the generated GS program.
The current implementation only counts full primitives, that is, if the
output primitive type is a triangle strip, it won't count individual
triangles in the strip, only complete strips.
If we want to count basic primitives instead we have two options: rework
the assembly code we generate for strip primitives or simply use
CL_INVOCATION_COUNT to resolve the query and let the hardware do that work
for us. This patch implements the latter approach.
Fixes the following piglit test:
bin/arb_pipeline_statistics_query-geom -auto
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89210
Tested-by: Mark Janes mark.a.ja...@intel.com
---
src/mesa/drivers/dri/i965/gen6_queryobj.c | 5 +
1 file changed, 5 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/gen6_queryobj.c
b/src/mesa/drivers/dri/i965/gen6_queryobj.c
index 09b66ca..6431ed5 100644
--- a/src/mesa/drivers/dri/i965/gen6_queryobj.c
+++ b/src/mesa/drivers/dri/i965/gen6_queryobj.c
@@ -147,6 +147,11 @@ emit_pipeline_stat(struct brw_context *brw, drm_intel_bo
*bo,
};
STATIC_ASSERT(ARRAY_SIZE(target_to_register) == MAX_PIPELINE_STATISTICS);
uint32_t reg = target_to_register[pipeline_target_to_index(target)];
+ /* Gen6 GS code counts full primitives, that is, it won't count individual
+* triangles in a triangle strip. Use CL_INVOCATION_COUNT for that.
+*/
+ if (brw-gen == 6 target == GL_GEOMETRY_SHADER_PRIMITIVES_EMITTED_ARB)
+ reg = CL_INVOCATION_COUNT;
assert(reg != 0);
/* Emit a flush to make sure various parts of the pipeline are complete and
--
1.9.1
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