swr: [rasterizer core] fix primID provoking vertex for GS

Reviewed-by: Bruce Cherniak <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gallium/drivers/swr/rasterizer/core/frontend.cpp b/src/gallium/drivers/swr/rasterizer/core/frontend.cpp
index c150c51199f..18728e5f557 100644
--- a/src/gallium/drivers/swr/rasterizer/core/frontend.cpp
+++ b/src/gallium/drivers/swr/rasterizer/core/frontend.cpp
@@ -815,7 +815,7 @@ static void GeometryShaderStage(
                                 {
                                     simdvector primIdAttrib[3];
                                     gsPa.Assemble(VERTEX_PRIMID_SLOT, primIdAttrib);
-                                    vPrimId = _simd_castps_si(primIdAttrib[0].x);
+                                    vPrimId = _simd_castps_si(primIdAttrib[state.frontendState.topologyProvokingVertex].x);
                                 }
                                 else
                                 {
@@ -1682,4 +1682,4 @@ PFN_FE_WORK_FUNC GetProcessDrawFunc(
     bool HasRasterization)
 {
     return TemplateArgUnroller<FEDrawChooser>::GetFunc(IsIndexed, IsCutIndexEnabled, HasTessellation, HasGeometryShader, HasStreamOut, HasRasterization);
-}
\ No newline at end of file
+}