mesa: implement per-buffer color masking

This is part of the GL_EXT_draw_buffers2 extension and part of GL 3.0.

The ctx->Color.ColorMask field is now a 2-D array.  Until drivers are
modified to support per-buffer color masking, they can just look at
the 0th color mask.

The new _mesa_ColorMaskIndexed() function will be called by
glColorMaskIndexedEXT() or glColorMaski().

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 6dadf5c079..496b0d2ba8 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -625,6 +625,8 @@ struct dd_function_table {
    /** Enable and disable writing of frame buffer color components */
    void (*ColorMask)(GLcontext *ctx, GLboolean rmask, GLboolean gmask,
                      GLboolean bmask, GLboolean amask );
+   void (*ColorMaskIndexed)(GLcontext *ctx, GLuint buf, GLboolean rmask,
+                            GLboolean gmask, GLboolean bmask, GLboolean amask);
    /** Cause a material color to track the current color */
    void (*ColorMaterial)(GLcontext *ctx, GLenum face, GLenum mode);
    /** Specify whether front- or back-facing facets can be culled */