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anv: Stop doing too much per-sample shading

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We were setting anv_pipeline::sample_shading_enable based on
sampleShadingEnable without looking at minSampleShading.  We would then
pass this value into nir_lower_wpos_center which would add sample_pos to
frag_coord.  Then the back-end compiler picks up on the existence of
sample_pos and forces persample dispatch.  This leads to doing
per-sample dispatch whenever sampleShadingEnable = VK_TRUE regardless of
the value of minSampleShading.  This is almost certainly costing us
perf somewhere.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14022>
This commit is contained in:
Jason Ekstrand 2021-12-02 14:42:16 -06:00 • committed by Marge Bot
parent 5197809302
commit 1f559930b6
1 changed files with 19 additions and 21 deletions
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40
src/intel/vulkan/anv_pipeline.c
View file

@ -497,6 +497,13 @@ pipeline_has_coarse_pixel(const struct anv_graphics_pipeline *pipeline,
return true;
}
static bool
is_sample_shading(const VkPipelineMultisampleStateCreateInfo *ms_info)
{
return ms_info->sampleShadingEnable &&
(ms_info->minSampleShading * ms_info->rasterizationSamples) > 1;
}
static void
populate_wm_prog_key(const struct anv_graphics_pipeline *pipeline,
VkPipelineShaderStageCreateFlags flags,
@ -542,14 +549,8 @@ populate_wm_prog_key(const struct anv_graphics_pipeline *pipeline,
key->alpha_test_replicate_alpha = false;
if (ms_info) {
/* We should probably pull this out of the shader, but it's fairly
* harmless to compute it and then let dead-code take care of it.
*/
if (ms_info->rasterizationSamples > 1) {
key->persample_interp = ms_info->sampleShadingEnable &&
(ms_info->minSampleShading * ms_info->rasterizationSamples) > 1;
key->multisample_fbo = true;
}
key->persample_interp = is_sample_shading(ms_info);
key->multisample_fbo = ms_info->rasterizationSamples > 1;
}
key->coarse_pixel =
@ -2414,10 +2415,16 @@ anv_graphics_pipeline_init(struct anv_graphics_pipeline *pipeline,
PIPELINE_RASTERIZATION_DEPTH_CLIP_STATE_CREATE_INFO_EXT);
pipeline->depth_clip_enable = clip_info ? clip_info->depthClipEnable : !pipeline->depth_clamp_enable;
pipeline->sample_shading_enable =
!pCreateInfo->pRasterizationState->rasterizerDiscardEnable &&
pCreateInfo->pMultisampleState &&
pCreateInfo->pMultisampleState->sampleShadingEnable;
/* If rasterization is not enabled, ms_info must be ignored. */
const bool raster_enabled =
!pCreateInfo->pRasterizationState->rasterizerDiscardEnable ||
(pipeline->dynamic_states &
ANV_CMD_DIRTY_DYNAMIC_RASTERIZER_DISCARD_ENABLE);
const VkPipelineMultisampleStateCreateInfo *ms_info =
raster_enabled ? pCreateInfo->pMultisampleState : NULL;
pipeline->sample_shading_enable = ms_info && is_sample_shading(ms_info);
result = anv_pipeline_compile_graphics(pipeline, cache, pCreateInfo);
if (result != VK_SUCCESS) {
@ -2499,15 +2506,6 @@ anv_graphics_pipeline_init(struct anv_graphics_pipeline *pipeline,
pipeline->topology = vk_to_intel_primitive_type[ia_info->topology];
}
/* If rasterization is not enabled, ms_info must be ignored. */
const bool raster_enabled =
!pCreateInfo->pRasterizationState->rasterizerDiscardEnable ||
(pipeline->dynamic_states &
ANV_CMD_DIRTY_DYNAMIC_RASTERIZER_DISCARD_ENABLE);
const VkPipelineMultisampleStateCreateInfo *ms_info =
raster_enabled ? pCreateInfo->pMultisampleState : NULL;
const VkPipelineRasterizationLineStateCreateInfoEXT *line_info =
vk_find_struct_const(pCreateInfo->pRasterizationState->pNext,
PIPELINE_RASTERIZATION_LINE_STATE_CREATE_INFO_EXT);