intel/vec4: Stomp the return type of RESINFO to UINT32

We already do this in the FS back-end; we just weren't doing it in vec4
so RESINFO messages weren't returning the right data.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5243>

src/intel/compiler/brw_vec4_generator.cpp

@@ -270,6 +270,17 @@ generate_tex(struct brw_codegen *p,
       break;
    }
 
+   /* Stomp the resinfo output type to UINT32.  On gens 4-5, the output type
+    * is set as part of the message descriptor.  On gen4, the PRM seems to
+    * allow UINT32 and FLOAT32 (i965 PRM, Vol. 4 Section 4.8.1.1), but on
+    * later gens UINT32 is required.  Once you hit Sandy Bridge, the bit is
+    * gone from the message descriptor entirely and you just get UINT32 all
+    * the time regasrdless.  Since we can really only do non-UINT32 on gen4,
+    * just stomp it to UINT32 all the time.
+    */
+   if (inst->opcode == SHADER_OPCODE_TXS)
+      return_format = BRW_SAMPLER_RETURN_FORMAT_UINT32;
+
    uint32_t base_binding_table_index = (inst->opcode == SHADER_OPCODE_TG4 ||
          inst->opcode == SHADER_OPCODE_TG4_OFFSET)
          ? prog_data->base.binding_table.gather_texture_start