Add outputs_written bitfield to pipe_shader_state, use it to determine if fragment shader writes Z.

1 files changed, 35 insertions, 14 deletions

diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 807cd8cb052..86aaaad6bb3 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -160,6 +160,8 @@ st_translate_vertex_program(struct st_context *st,
             defaultOutputMapping[attr] = slot;
          }
 
+         vs.outputs_written |= (1 << slot);
+
          /*
          printf("Output %u -> slot %u\n", attr, slot);
          */
@@ -346,21 +348,40 @@ st_translate_fragment_program(struct st_context *st,
    /*
     * Semantics for outputs
     */
-   for (attr = 0; attr < FRAG_RESULT_MAX; attr++) {
-      if (stfp->Base.Base.OutputsWritten & (1 << attr)) {
-         switch (attr) {
-         case FRAG_RESULT_DEPR:
-            fs.output_semantic_name[fs.num_outputs] = TGSI_SEMANTIC_POSITION;
-            outputMapping[attr] = fs.num_outputs;
-            break;
-         case FRAG_RESULT_COLR:
-            fs.output_semantic_name[fs.num_outputs] = TGSI_SEMANTIC_COLOR;
-            outputMapping[attr] = fs.num_outputs;
-            break;
-         default:
-            assert(0);
+   {
+      uint numColors = 0;
+      GLbitfield outputsWritten = stfp->Base.Base.OutputsWritten;
+
+      /* output[0] is always Z, but may not really be written */
+      fs.output_semantic_name[fs.num_outputs] = TGSI_SEMANTIC_POSITION;
+      fs.output_semantic_index[fs.num_outputs] = 0;
+      outputMapping[FRAG_RESULT_DEPR] = fs.num_outputs;
+      fs.num_outputs++;
+
+      if (outputsWritten & (1 << FRAG_RESULT_DEPR)) {
+         fs.outputs_written |= 0x1;
+         outputsWritten &= ~(1 << FRAG_RESULT_DEPR);
+      }
+
+      /* color outputs begin at output [1] */
+      for (attr = 0; attr < FRAG_RESULT_MAX; attr++) {
+         if (outputsWritten & (1 << attr)) {
+            switch (attr) {
+            case FRAG_RESULT_DEPR:
+               assert(0);
+               break;
+            case FRAG_RESULT_COLR:
+               fs.output_semantic_name[fs.num_outputs] = TGSI_SEMANTIC_COLOR;
+               fs.output_semantic_index[fs.num_outputs] = numColors;
+               outputMapping[attr] = fs.num_outputs;
+               fs.outputs_written |= (0x2 << numColors);
+               numColors++;
+               break;
+            default:
+               assert(0);
+            }
+            fs.num_outputs++;
          }
-         fs.num_outputs++;
       }
    }