[Mesa-dev] [PATCH 2/2] r600/llvm: Fix isampleBuffer on preEG

[Vincent Lejeune]

On R600/R700 hw the data are stored from the channel 2 of the second dword.
---
 src/gallium/drivers/r600/r600_llvm.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r600/r600_llvm.c b/src/gallium/drivers/r600/r600_llvm.c
index d7fa5f8..5afe3cb 100644
--- a/src/gallium/drivers/r600/r600_llvm.c
+++ b/src/gallium/drivers/r600/r600_llvm.c
@@ -415,9 +415,22 @@ static void llvm_emit_tex(
 		case TGSI_OPCODE_TXQ: {
 			struct radeon_llvm_context * ctx = radeon_llvm_context(bld_base);
 			ctx->uses_tex_buffers = true;
-			LLVMValueRef offset = lp_build_const_int32(bld_base->base.gallivm, 0);
+			bool isEgPlus = (ctx->chip_class >= EVERGREEN);
+			LLVMValueRef offset = lp_build_const_int32(bld_base->base.gallivm,
+				isEgPlus ? 0 : 1);
 			LLVMValueRef cvecval = llvm_load_const_buffer(bld_base, offset,
 				LLVM_R600_BUFFER_INFO_CONST_BUFFER);
+			if (!isEgPlus) {
+				LLVMValueRef maskval[4] = {
+					lp_build_const_int32(gallivm, 1),
+					lp_build_const_int32(gallivm, 2),
+					lp_build_const_int32(gallivm, 3),
+					lp_build_const_int32(gallivm, 0),
+				};
+				LLVMValueRef mask = LLVMConstVector(maskval, 4);
+				cvecval = LLVMBuildShuffleVector(gallivm->builder, cvecval, cvecval,
+					mask, "");
+			}
 			emit_data->output[0] = cvecval;
 			return;
 		}
-- 
1.8.3.1