radeonsi: Handle TGSI_SEMANTIC_FACE.
Fixes two piglit tests using gl_FrontFacing.
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c b/src/gallium/drivers/radeonsi/radeonsi_shader.c
index aec5c2e..53e889c 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_shader.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c
@@ -266,6 +266,33 @@
return;
}
+ if (decl->Semantic.Name == TGSI_SEMANTIC_FACE) {
+ LLVMValueRef face, is_face_positive;
+
+ face = build_intrinsic(gallivm->builder,
+ "llvm.SI.fs.read.face",
+ input_type,
+ NULL, 0, LLVMReadNoneAttribute);
+ is_face_positive = LLVMBuildFCmp(gallivm->builder,
+ LLVMRealUGT, face,
+ lp_build_const_float(gallivm, 0.0f),
+ "");
+
+ si_shader_ctx->radeon_bld.inputs[radeon_llvm_reg_index_soa(input_index, 0)] =
+ LLVMBuildSelect(gallivm->builder,
+ is_face_positive,
+ lp_build_const_float(gallivm, 1.0f),
+ lp_build_const_float(gallivm, 0.0f),
+ "");
+ si_shader_ctx->radeon_bld.inputs[radeon_llvm_reg_index_soa(input_index, 1)] =
+ si_shader_ctx->radeon_bld.inputs[radeon_llvm_reg_index_soa(input_index, 2)] =
+ lp_build_const_float(gallivm, 0.0f);
+ si_shader_ctx->radeon_bld.inputs[radeon_llvm_reg_index_soa(input_index, 3)] =
+ lp_build_const_float(gallivm, 1.0f);
+
+ return;
+ }
+
shader->input[input_index].param_offset = shader->ninterp++;
attr_number = lp_build_const_int32(gallivm,
shader->input[input_index].param_offset);