swrast: fix span color array pointer assignment for 32-bit/channel rendering

See fd.o bug 29487.

NOTE: This is a candidate for the 7.8 branch.

Signed-off-by: Brian Paul <brianp@vmware.com>

diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 3b3929a..8931cde 100644 (file)
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -970,6 +970,10 @@ shade_texture_span(GLcontext *ctx, SWspan *span)
       if (span->primitive == GL_BITMAP && span->array->ChanType != GL_FLOAT) {
          convert_color_type(span, GL_FLOAT, 0);
       }
+      else {
+         span->array->rgba = (void *) span->array->attribs[FRAG_ATTRIB_COL0];
+      }
+
       if (span->primitive != GL_POINT ||
          (span->interpMask & SPAN_RGBA) ||
          ctx->Point.PointSprite) {
@@ -1221,9 +1225,22 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
             GLchan rgbaSave[MAX_WIDTH][4];
             const GLuint fragOutput = multiFragOutputs ? buf : 0;
 
+            /* set span->array->rgba to colors for render buffer's datatype */
             if (rb->DataType != span->array->ChanType || fragOutput > 0) {
                convert_color_type(span, rb->DataType, fragOutput);
             }
+            else {
+               if (rb->DataType == GL_UNSIGNED_BYTE) {
+                  span->array->rgba = span->array->rgba8;
+               }
+               else if (rb->DataType == GL_UNSIGNED_SHORT) {
+                  span->array->rgba = (void *) span->array->rgba16;
+               }
+               else {
+                  span->array->rgba = (void *)
+                     span->array->attribs[FRAG_ATTRIB_COL0];
+               }
+            }
 
             if (!multiFragOutputs && numBuffers > 1) {
                /* save colors for second, third renderbuffer writes */