draw: preserve specular alpha when flatshading -- may be FOGC

1 files changed, 28 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pipe_flatshade.c b/src/gallium/auxiliary/draw/draw_pipe_flatshade.c
index 21a9c3b77f..4741b22d02 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_flatshade.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_flatshade.c
@@ -40,9 +40,19 @@ struct flat_stage
    struct draw_stage stage;
 
    uint num_color_attribs;
-   uint color_attribs[4];  /* front/back primary/secondary colors */
+   uint color_attribs[2];  /* front/back primary colors */
+
+   uint num_spec_attribs;
+   uint spec_attribs[2];  /* front/back secondary colors */
 };
 
+#define COPY_3FV( DST, SRC )         \
+do {                                \
+   (DST)[0] = (SRC)[0];             \
+   (DST)[1] = (SRC)[1];             \
+   (DST)[2] = (SRC)[2];             \
+} while (0)
+
 
 static INLINE struct flat_stage *
 flat_stage(struct draw_stage *stage)
@@ -58,10 +68,16 @@ static INLINE void copy_colors( struct draw_stage *stage,
 {
    const struct flat_stage *flat = flat_stage(stage);
    uint i;
+
    for (i = 0; i < flat->num_color_attribs; i++) {
       const uint attr = flat->color_attribs[i];
       COPY_4FV(dst->data[attr], src->data[attr]);
    }
+
+   for (i = 0; i < flat->num_spec_attribs; i++) {
+      const uint attr = flat->spec_attribs[i];
+      COPY_3FV(dst->data[attr], src->data[attr]);
+   }
 }
 
 
@@ -78,6 +94,12 @@ static INLINE void copy_colors2( struct draw_stage *stage,
       COPY_4FV(dst0->data[attr], src->data[attr]);
       COPY_4FV(dst1->data[attr], src->data[attr]);
    }
+
+   for (i = 0; i < flat->num_spec_attribs; i++) {
+      const uint attr = flat->spec_attribs[i];
+      COPY_3FV(dst0->data[attr], src->data[attr]);
+      COPY_3FV(dst1->data[attr], src->data[attr]);
+   }
 }
 
 
@@ -164,10 +186,14 @@ static void flatshade_init_state( struct draw_stage *stage )
 
    /* Find which vertex shader outputs are colors, make a list */
    flat->num_color_attribs = 0;
+   flat->num_spec_attribs = 0;
    for (i = 0; i < vs->info.num_outputs; i++) {
       if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_COLOR ||
           vs->info.output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
-         flat->color_attribs[flat->num_color_attribs++] = i;
+         if (vs->info.output_semantic_index[i] == 0)
+            flat->color_attribs[flat->num_color_attribs++] = i;
+         else
+            flat->spec_attribs[flat->num_spec_attribs++] = i;
       }
    }