diff options
| author | Kenneth Graunke <[email protected]> | 2015-05-10 23:33:30 -0700 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2015-06-01 12:45:40 -0700 |
| commit | 9945573d65f4f66d127df7cbb62648889d09a7ed (patch) | |
| tree | 7e6db6a184129fc163d9f57f3784f22de57d99ee | |
| parent | f97166e550f17f69f8de7e51775e745a5218d3e7 (diff) | |
i965: Drop "Vector Mask Enable" bit from 3DSTATE_GS on Gen8+.
The documentation makes it pretty clear that we shouldn't use this:
"Under normal conditions SW shall specify DMask, as the GS stage
will provide a Dispatch Mask appropriate to SIMD4x2 or SIMD8 thread
execution (as a function of dispatch mode). E.g., for SIMD4x2
execution, the GS stage will generate a Dispatch Mask that is equal
to what the EU would use as the Vector Mask. For SIMD8 execution
there is no known usage model for use of Vector Mask (as there is
for PS shaders)."
I also managed to find descriptions of DMask and VMask, in the "State
Register" (sr0.2/3) field descriptions:
"Dispatch Mask (DMask). This 32-bit field specifies which channels
are active at Dispatch time."
"Vector Mask (VMask). This 32-bit field contains, for each 4-bit
group, the OR of the corresponding 4-bit group in the dispatch
mask."
SIMD4x2 shaders process one or two vec4 values, with each 4-bit group
corresponding to xyzw channel enables (either all on, or all off).
Thus, DMask = VMask in SIMD4x2 mode. But in SIMD8 mode, 4-bit groups
are meaningless, so it just messes up your values.
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ben Widawsky <[email protected]>
| -rw-r--r-- | src/mesa/drivers/dri/i965/gen8_gs_state.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i965/gen8_gs_state.c b/src/mesa/drivers/dri/i965/gen8_gs_state.c index 6a0e215eca3..0763e910561 100644 --- a/src/mesa/drivers/dri/i965/gen8_gs_state.c +++ b/src/mesa/drivers/dri/i965/gen8_gs_state.c @@ -48,8 +48,7 @@ gen8_upload_gs_state(struct brw_context *brw) OUT_BATCH(_3DSTATE_GS << 16 | (10 - 2)); OUT_BATCH(stage_state->prog_offset); OUT_BATCH(0); - OUT_BATCH(GEN6_GS_VECTOR_MASK_ENABLE | - brw->geometry_program->VerticesIn | + OUT_BATCH(brw->geometry_program->VerticesIn | ((ALIGN(stage_state->sampler_count, 4)/4) << GEN6_GS_SAMPLER_COUNT_SHIFT) | ((prog_data->base.binding_table.size_bytes / 4) << |