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().

2 files changed, 16 insertions, 18 deletions

diff --git a/src/mesa/drivers/dri/mga/mgapixel.c b/src/mesa/drivers/dri/mga/mgapixel.c
index 977dfa0b76..05b30ba61e 100644
--- a/src/mesa/drivers/dri/mga/mgapixel.c
+++ b/src/mesa/drivers/dri/mga/mgapixel.c
@@ -134,10 +134,10 @@ check_color_per_fragment_ops( const GLcontext *ctx )
 		    ctx->Fog.Enabled ||
 		    ctx->Scissor.Enabled ||
 		    ctx->Stencil._Enabled ||
-		    !ctx->Color.ColorMask[0] ||
-		    !ctx->Color.ColorMask[1] ||
-		    !ctx->Color.ColorMask[2] ||
-		    !ctx->Color.ColorMask[3] ||
+		    !ctx->Color.ColorMask[0][0] ||
+		    !ctx->Color.ColorMask[0][1] ||
+		    !ctx->Color.ColorMask[0][2] ||
+		    !ctx->Color.ColorMask[0][3] ||
 		    ctx->Color.ColorLogicOpEnabled ||
 		    ctx->Texture._EnabledUnits
            ) &&
@@ -150,10 +150,10 @@ static GLboolean
 check_depth_per_fragment_ops( const GLcontext *ctx )
 {
    return ( ctx->Current.RasterPosValid &&
-	    ctx->Color.ColorMask[RCOMP] == 0 &&
-	    ctx->Color.ColorMask[BCOMP] == 0 &&
-	    ctx->Color.ColorMask[GCOMP] == 0 &&
-	    ctx->Color.ColorMask[ACOMP] == 0 &&
+	    ctx->Color.ColorMask[0][RCOMP] == 0 &&
+	    ctx->Color.ColorMask[0][BCOMP] == 0 &&
+	    ctx->Color.ColorMask[0][GCOMP] == 0 &&
+	    ctx->Color.ColorMask[0][ACOMP] == 0 &&
 	    ctx->Pixel.ZoomX == 1.0F &&
 	    ( ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F ) );
 }
@@ -525,10 +525,10 @@ mgaTryDrawPixels( GLcontext *ctx,
 	      mmesa->mgaScreen->backOffset);
 
       planemask = mgaPackColor(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 (cpp == 2)
 	 planemask |= planemask << 16;
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);