Replace gl_framebuffer's _ColorDrawBufferMask with _ColorDrawBufferIndexes

Each array element is now a BUFFER_x token rather than a BUFFER_BIT_x bitmask.
The number of active color buffers is specified by _NumColorDrawBuffers.
This builds on the previous DrawBuffer changes and will help with drivers
implementing GL_ARB_draw_buffers.

1 files changed, 9 insertions, 7 deletions

diff --git a/src/mesa/drivers/dri/mga/mgastate.c b/src/mesa/drivers/dri/mga/mgastate.c
index 88f2175cc3e..1d413d34734 100644
--- a/src/mesa/drivers/dri/mga/mgastate.c
+++ b/src/mesa/drivers/dri/mga/mgastate.c
@@ -799,20 +799,22 @@ static void mgaDDDrawBuffer(GLcontext *ctx, GLenum mode )
 
    FLUSH_BATCH( mmesa );
 
-   /*
-    * _DrawDestMask is easier to cope with than <mode>.
-    */
-   switch ( ctx->DrawBuffer->_ColorDrawBufferMask[0] ) {
-   case BUFFER_BIT_FRONT_LEFT:
+   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
+      /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
+      FALLBACK( ctx, MGA_FALLBACK_DRAW_BUFFER, GL_TRUE );
+      return;
+   }
+
+   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
+   case BUFFER_FRONT_LEFT:
       mmesa->setup.dstorg = mmesa->mgaScreen->frontOffset;
       mmesa->draw_buffer = MGA_FRONT;
       break;
-   case BUFFER_BIT_BACK_LEFT:
+   case BUFFER_BACK_LEFT:
       mmesa->setup.dstorg = mmesa->mgaScreen->backOffset;
       mmesa->draw_buffer = MGA_BACK;
       break;
    default:
-      /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
       FALLBACK( ctx, MGA_FALLBACK_DRAW_BUFFER, GL_TRUE );
       return;
    }