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.

2 files changed, 11 insertions, 6 deletions

diff --git a/src/mesa/drivers/dri/unichrome/via_context.c b/src/mesa/drivers/dri/unichrome/via_context.c
index 1551be5e75..a06b65224d 100644
--- a/src/mesa/drivers/dri/unichrome/via_context.c
+++ b/src/mesa/drivers/dri/unichrome/via_context.c
@@ -736,8 +736,8 @@ void viaXMesaWindowMoved(struct via_context *vmesa)
    draw_buffer =  (struct via_renderbuffer *) drawable->driverPrivate;
    read_buffer =  (struct via_renderbuffer *) readable->driverPrivate;
    
-   switch (vmesa->glCtx->DrawBuffer->_ColorDrawBufferMask[0]) {
-   case BUFFER_BIT_BACK_LEFT: 
+   switch (vmesa->glCtx->DrawBuffer->_ColorDrawBufferIndexes[0]) {
+   case BUFFER_BACK_LEFT: 
       if (drawable->numBackClipRects == 0) {
 	 vmesa->numClipRects = drawable->numClipRects;
 	 vmesa->pClipRects = drawable->pClipRects;
@@ -747,7 +747,7 @@ void viaXMesaWindowMoved(struct via_context *vmesa)
 	 vmesa->pClipRects = drawable->pBackClipRects;
       }
       break;
-   case BUFFER_BIT_FRONT_LEFT:
+   case BUFFER_FRONT_LEFT:
       vmesa->numClipRects = drawable->numClipRects;
       vmesa->pClipRects = drawable->pClipRects;
       break;
diff --git a/src/mesa/drivers/dri/unichrome/via_state.c b/src/mesa/drivers/dri/unichrome/via_state.c
index bccdbe9326..d2c528923f 100644
--- a/src/mesa/drivers/dri/unichrome/via_state.c
+++ b/src/mesa/drivers/dri/unichrome/via_state.c
@@ -656,13 +656,18 @@ static void viaDrawBuffer(GLcontext *ctx, GLenum mode)
    if (!ctx->DrawBuffer)
       return;
 
-   switch ( ctx->DrawBuffer->_ColorDrawBufferMask[0] ) {
-   case BUFFER_BIT_FRONT_LEFT:
+   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
+      FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_TRUE);
+      return;
+   }
+
+   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
+   case BUFFER_FRONT_LEFT:
       VIA_FLUSH_DMA(vmesa);
       vmesa->drawBuffer = &vmesa->front;
       FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_FALSE);
       break;
-   case BUFFER_BIT_BACK_LEFT:
+   case BUFFER_BACK_LEFT:
       VIA_FLUSH_DMA(vmesa);
       vmesa->drawBuffer = &vmesa->back;
       FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_FALSE);