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, 4 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
index 8d75c63cef..84ac7889b2 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.c
+++ b/src/mesa/drivers/dri/intel/intel_fbo.c
@@ -71,7 +71,10 @@ intel_renderbuffer(struct gl_renderbuffer *rb)
 struct intel_renderbuffer *
 intel_get_renderbuffer(struct gl_framebuffer *fb, GLuint attIndex)
 {
-   return intel_renderbuffer(fb->Attachment[attIndex].Renderbuffer);
+   if (attIndex >= 0)
+      return intel_renderbuffer(fb->Attachment[attIndex].Renderbuffer);
+   else
+      return NULL;
 }