gallivm/tgsi: fix stream id regression

This broke TGSI GS shaders with llvmpipe, it wasn't looking at the
right immediates and it should be cast to an integer type.

Fixes: 163d5fde0669 (gallium/swr: Enable GL_ARB_gpu_shader5: multiple streams)

Reviewed-by: Krzysztof Raszkowski <krzysztof.raszkowski@intel.com>
Acked-by: Jan Zielinski <jan.zielinski@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3949>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3949>

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index 8dad608..d884c2d 100644 (file)
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
@@ -3944,11 +3944,14 @@ emit_vertex(
    LLVMBuilderRef builder = bld->bld_base.base.gallivm->builder;
 
    if (bld->gs_iface->emit_vertex) {
-      uint32_t imms_idx = emit_data->inst->Src[0].Register.SwizzleX;
-      LLVMValueRef stream_id = bld->immediates[0][imms_idx];
+      uint32_t stream_reg_idx = emit_data->inst->Src[0].Register.Index;
+      uint32_t stream_reg_swiz = emit_data->inst->Src[0].Register.SwizzleX;
+      LLVMValueRef stream_id = bld->immediates[stream_reg_idx][stream_reg_swiz];
       LLVMValueRef mask = mask_vec(bld_base);
       LLVMValueRef total_emitted_vertices_vec =
          LLVMBuildLoad(builder, bld->total_emitted_vertices_vec_ptr, "");
+
+      stream_id = LLVMBuildBitCast(builder, stream_id, bld_base->uint_bld.vec_type, "");
       mask = clamp_mask_to_max_output_vertices(bld, mask,
                                                total_emitted_vertices_vec);
       gather_outputs(bld);