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, 4 insertions, 6 deletions

diff --git a/src/mesa/drivers/dri/mga/mgastate.c b/src/mesa/drivers/dri/mga/mgastate.c
index 7c830ec097..1e51057534 100644
--- a/src/mesa/drivers/dri/mga/mgastate.c
+++ b/src/mesa/drivers/dri/mga/mgastate.c
@@ -374,13 +374,11 @@ static void mgaDDColorMask(GLcontext *ctx,
 {
    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
    mgaScreenPrivate *mgaScreen = mmesa->mgaScreen;
-
-
    GLuint mask = mgaPackColor(mgaScreen->cpp,
-			      ctx->Color.ColorMask[RCOMP],
-			      ctx->Color.ColorMask[GCOMP],
-			      ctx->Color.ColorMask[BCOMP],
-			      ctx->Color.ColorMask[ACOMP]);
+			      ctx->Color.ColorMask[0][RCOMP],
+			      ctx->Color.ColorMask[0][GCOMP],
+			      ctx->Color.ColorMask[0][BCOMP],
+			      ctx->Color.ColorMask[0][ACOMP]);
 
    if (mgaScreen->cpp == 2)
       mask = mask | (mask << 16);