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authorEric Anholt <eric@anholt.net>2011-04-20 17:55:54 -0700
committerEric Anholt <eric@anholt.net>2011-04-23 13:21:58 -0700
commite4da46e007de5c83202976a12efb0e894494a354 (patch)
treeccd3003887c40edf44efa26330d345795d1fa498
parentd7f4c4e1b187552ede397f00fb56a6f0bb724ce1 (diff)
mesa: Add some comments about FRAG_RESULT_COLOR vs FRAG_RESULT_DATAn.
This came from reading what swrast does, and 965 now behaves the same and gallium appears to as well.
-rw-r--r--src/mesa/main/mtypes.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 160ae9d2622..e90941d3570 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -376,7 +376,15 @@ typedef enum
{
FRAG_RESULT_DEPTH = 0,
FRAG_RESULT_STENCIL = 1,
+ /* If a single color should be written to all render targets, this
+ * register is written. No FRAG_RESULT_DATAn will be written.
+ */
FRAG_RESULT_COLOR = 2,
+
+ /* FRAG_RESULT_DATAn are the per-render-target (GLSL gl_FragData[n]
+ * or ARB_fragment_program fragment.color[n]) color results. If
+ * any are written, FRAG_RESULT_COLOR will not be written.
+ */
FRAG_RESULT_DATA0 = 3,
FRAG_RESULT_MAX = (FRAG_RESULT_DATA0 + MAX_DRAW_BUFFERS)
} gl_frag_result;