i965: Handle unwritten PSIZ/VIEWPORT/LAYER outputs in vec4 shaders.

This can occur if the shader is capturing some of the values from the
VUE header for transform feedback, but the shader hasn't written all of
them.

Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>

diff --git a/src/intel/compiler/brw_vec4_visitor.cpp b/src/intel/compiler/brw_vec4_visitor.cpp
index 22ee4dd..88e80aa 100644 (file)
--- a/src/intel/compiler/brw_vec4_visitor.cpp
+++ b/src/intel/compiler/brw_vec4_visitor.cpp
@@ -1245,7 +1245,7 @@ vec4_visitor::emit_psiz_and_flags(dst_reg reg)
       emit(MOV(retype(reg, BRW_REGISTER_TYPE_UD), brw_imm_ud(0u)));
    } else {
       emit(MOV(retype(reg, BRW_REGISTER_TYPE_D), brw_imm_d(0)));
-      if (prog_data->vue_map.slots_valid & VARYING_BIT_PSIZ) {
+      if (output_reg[VARYING_SLOT_PSIZ][0].file != BAD_FILE) {
          dst_reg reg_w = reg;
          reg_w.writemask = WRITEMASK_W;
          src_reg reg_as_src = src_reg(output_reg[VARYING_SLOT_PSIZ][0]);
@@ -1253,14 +1253,14 @@ vec4_visitor::emit_psiz_and_flags(dst_reg reg)
          reg_as_src.swizzle = brw_swizzle_for_size(1);
          emit(MOV(reg_w, reg_as_src));
       }
-      if (prog_data->vue_map.slots_valid & VARYING_BIT_LAYER) {
+      if (output_reg[VARYING_SLOT_LAYER][0].file != BAD_FILE) {
          dst_reg reg_y = reg;
          reg_y.writemask = WRITEMASK_Y;
          reg_y.type = BRW_REGISTER_TYPE_D;
          output_reg[VARYING_SLOT_LAYER][0].type = reg_y.type;
          emit(MOV(reg_y, src_reg(output_reg[VARYING_SLOT_LAYER][0])));
       }
-      if (prog_data->vue_map.slots_valid & VARYING_BIT_VIEWPORT) {
+      if (output_reg[VARYING_SLOT_VIEWPORT][0].file != BAD_FILE) {
          dst_reg reg_z = reg;
          reg_z.writemask = WRITEMASK_Z;
          reg_z.type = BRW_REGISTER_TYPE_D;