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, 17 insertions, 5 deletions

diff --git a/src/mesa/drivers/common/driverfuncs.c b/src/mesa/drivers/common/driverfuncs.c
index 9b271f85e92..5c5e17820d6 100644
--- a/src/mesa/drivers/common/driverfuncs.c
+++ b/src/mesa/drivers/common/driverfuncs.c
@@ -264,11 +264,23 @@ _mesa_init_driver_state(GLcontext *ctx)
                                  ctx->Color.BlendDstRGB,
                                  ctx->Color.BlendSrcA, ctx->Color.BlendDstA);
 
-   ctx->Driver.ColorMask(ctx,
-                         ctx->Color.ColorMask[RCOMP],
-                         ctx->Color.ColorMask[GCOMP],
-                         ctx->Color.ColorMask[BCOMP],
-                         ctx->Color.ColorMask[ACOMP]);
+   if (ctx->Driver.ColorMaskIndexed) {
+      GLuint i;
+      for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
+         ctx->Driver.ColorMaskIndexed(ctx, i,
+                                      ctx->Color.ColorMask[0][RCOMP],
+                                      ctx->Color.ColorMask[0][GCOMP],
+                                      ctx->Color.ColorMask[0][BCOMP],
+                                      ctx->Color.ColorMask[0][ACOMP]);
+      }
+   }
+   else {
+      ctx->Driver.ColorMask(ctx,
+                            ctx->Color.ColorMask[0][RCOMP],
+                            ctx->Color.ColorMask[0][GCOMP],
+                            ctx->Color.ColorMask[0][BCOMP],
+                            ctx->Color.ColorMask[0][ACOMP]);
+   }
 
    ctx->Driver.CullFace(ctx, ctx->Polygon.CullFaceMode);
    ctx->Driver.DepthFunc(ctx, ctx->Depth.Func);