radeon/llvm: add support for non-scalar system values

The sample position is one of them.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

diff --git a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
index 60ade78..f8be0df 100644 (file)
--- a/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
+++ b/src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c
@@ -218,7 +218,13 @@ static LLVMValueRef fetch_system_value(
        unsigned swizzle)
 {
        struct radeon_llvm_context * ctx = radeon_llvm_context(bld_base);
+       struct gallivm_state *gallivm = bld_base->base.gallivm;
+
        LLVMValueRef cval = ctx->system_values[reg->Register.Index];
+       if (LLVMGetTypeKind(LLVMTypeOf(cval)) == LLVMVectorTypeKind) {
+               cval = LLVMBuildExtractElement(gallivm->builder, cval,
+                                              lp_build_const_int32(gallivm, swizzle), "");
+       }
        return bitcast(bld_base, type, cval);
 }