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, 4 deletions

diff --git a/src/mesa/drivers/windows/gdi/wmesa.c b/src/mesa/drivers/windows/gdi/wmesa.c
index 8929b22af1..76c825a090 100644
--- a/src/mesa/drivers/windows/gdi/wmesa.c
+++ b/src/mesa/drivers/windows/gdi/wmesa.c
@@ -301,10 +301,10 @@ static void clear(GLcontext *ctx, GLbitfield mask)
 
     /* Let swrast do all the work if the masks are not set to
      * clear all channels. */
-    if (ctx->Color.ColorMask[0] != 0xff ||
-	ctx->Color.ColorMask[1] != 0xff ||
-	ctx->Color.ColorMask[2] != 0xff ||
-	ctx->Color.ColorMask[3] != 0xff) {
+    if (!ctx->Color.ColorMask[0][0] ||
+	!ctx->Color.ColorMask[0][1] ||
+	!ctx->Color.ColorMask[0][2] ||
+	!ctx->Color.ColorMask[0][3]) {
 	_swrast_Clear(ctx, mask);
 	return;
     }