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.

3 files changed, 19 insertions, 16 deletions

diff --git a/src/mesa/drivers/dri/sis/sis6326_state.c b/src/mesa/drivers/dri/sis/sis6326_state.c
index 08402fb3e2..e47e663c35 100644
--- a/src/mesa/drivers/dri/sis/sis6326_state.c
+++ b/src/mesa/drivers/dri/sis/sis6326_state.c
@@ -497,25 +497,27 @@ void sis6326DDDrawBuffer( GLcontext *ctx, GLenum mode )
    __GLSiSHardware *current = &smesa->current;
 
    if(getenv("SIS_DRAW_FRONT"))
-      ctx->DrawBuffer->_ColorDrawBufferMask[0] = GL_FRONT_LEFT;
+      ctx->DrawBuffer->_ColorDrawBufferIndexes[0] = BUFFER_FRONT_LEFT;
+
+   if (ctx->DrawBuffer->_NumColorDrawBuffers > 1) {
+      FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_TRUE );
+      return;
+   }
 
-   /*
-    * _DrawDestMask is easier to cope with than <mode>.
-    */
    current->hwDstSet &= ~MASK_DstBufferPitch;
-   switch ( ctx->DrawBuffer->_ColorDrawBufferMask[0] ) {
-   case BUFFER_BIT_FRONT_LEFT:
+
+   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
+   case BUFFER_FRONT_LEFT:
       current->hwOffsetDest = smesa->front.offset;
       current->hwDstSet |= smesa->front.pitch;
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
       break;
-   case BUFFER_BIT_BACK_LEFT:
+   case BUFFER_BACK_LEFT:
       current->hwOffsetDest = smesa->back.offset;
       current->hwDstSet |= smesa->back.pitch;
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
       break;
    default:
-      /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_TRUE );
       return;
    }
diff --git a/src/mesa/drivers/dri/sis/sis_state.c b/src/mesa/drivers/dri/sis/sis_state.c
index 33a2f089b8..b7454d4a07 100644
--- a/src/mesa/drivers/dri/sis/sis_state.c
+++ b/src/mesa/drivers/dri/sis/sis_state.c
@@ -547,23 +547,24 @@ void sisDDDrawBuffer( GLcontext *ctx, GLenum mode )
    __GLSiSHardware *prev = &smesa->prev;
    __GLSiSHardware *current = &smesa->current;
 
-   /*
-    * _DrawDestMask is easier to cope with than <mode>.
-    */
+   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
+      FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_TRUE );
+      return;
+   }
+
    current->hwDstSet &= ~MASK_DstBufferPitch;
-   switch ( ctx->DrawBuffer->_ColorDrawBufferMask[0] ) {
-   case BUFFER_BIT_FRONT_LEFT:
+   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
+   case BUFFER_FRONT_LEFT:
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
       current->hwOffsetDest = smesa->front.offset >> 1;
       current->hwDstSet |= smesa->front.pitch >> 2;
       break;
-   case BUFFER_BIT_BACK_LEFT:
+   case BUFFER_BACK_LEFT:
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
       current->hwOffsetDest = smesa->back.offset >> 1;
       current->hwDstSet |= smesa->back.pitch >> 2;
       break;
    default:
-      /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
       FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_TRUE );
       return;
    }
diff --git a/src/mesa/drivers/dri/sis/sis_tris.c b/src/mesa/drivers/dri/sis/sis_tris.c
index a0e39dcd3c..adbbb8ae13 100644
--- a/src/mesa/drivers/dri/sis/sis_tris.c
+++ b/src/mesa/drivers/dri/sis/sis_tris.c
@@ -848,7 +848,7 @@ static void sisRenderStart( GLcontext *ctx )
 
    RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );
 
-   if (ctx->DrawBuffer->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT && 
+   if (ctx->DrawBuffer->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT && 
       smesa->driDrawable->numClipRects != 0)
    {
       multipass_cliprect(ctx, 0);