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authorSamuel Pitoiset <samuel.pitoiset@gmail.com>2017-12-20 20:56:57 +0100
committerSamuel Pitoiset <samuel.pitoiset@gmail.com>2018-01-04 18:43:25 +0100
commit2670ebb5840c2108c55607520f1cf9eb5868e27a (patch)
tree0c079212591d0ebb5fc554a8fbfcd33ed024f139
parenta4d2782664a215fd90d9c92a3eded3e893501420 (diff)
radv/gfx9: reduce the number of input VGPRs for the GS stage
This can still be improved, but let's start with this. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
-rw-r--r--src/amd/vulkan/radv_shader.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index ab8ba42511e..31879805ae0 100644
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -411,8 +411,21 @@ radv_fill_shader_variant(struct radv_device *device,
if (device->physical_device->rad_info.chip_class >= GFX9 &&
stage == MESA_SHADER_GEOMETRY) {
+ struct ac_shader_info *info = &variant->info.info;
+ unsigned gs_vgpr_comp_cnt;
+
+ /* If offsets 4, 5 are used, GS_VGPR_COMP_CNT is ignored and
+ * VGPR[0:4] are always loaded.
+ */
+ if (info->uses_invocation_id)
+ gs_vgpr_comp_cnt = 3; /* VGPR3 contains InvocationID. */
+ else if (info->uses_prim_id)
+ gs_vgpr_comp_cnt = 2; /* VGPR2 contains PrimitiveID. */
+ else
+ gs_vgpr_comp_cnt = 1; /* TODO: use input_prim */
+
/* TODO: Figure out how many we actually need. */
- variant->rsrc1 |= S_00B228_GS_VGPR_COMP_CNT(3);
+ variant->rsrc1 |= S_00B228_GS_VGPR_COMP_CNT(gs_vgpr_comp_cnt);
variant->rsrc2 |= S_00B22C_ES_VGPR_COMP_CNT(3) |
S_00B22C_OC_LDS_EN(1);
} else if (device->physical_device->rad_info.chip_class >= GFX9 &&