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().

3 files changed, 13 insertions, 13 deletions

diff --git a/src/mesa/state_tracker/st_atom_blend.c b/src/mesa/state_tracker/st_atom_blend.c
index 35c09c3e08..43e62c29f3 100644
--- a/src/mesa/state_tracker/st_atom_blend.c
+++ b/src/mesa/state_tracker/st_atom_blend.c
@@ -200,13 +200,13 @@ update_blend( struct st_context *st )
    }
 
    /* Colormask - maybe reverse these bits? */
-   if (st->ctx->Color.ColorMask[0])
+   if (st->ctx->Color.ColorMask[0][0])
       blend->colormask |= PIPE_MASK_R;
-   if (st->ctx->Color.ColorMask[1])
+   if (st->ctx->Color.ColorMask[0][1])
       blend->colormask |= PIPE_MASK_G;
-   if (st->ctx->Color.ColorMask[2])
+   if (st->ctx->Color.ColorMask[0][2])
       blend->colormask |= PIPE_MASK_B;
-   if (st->ctx->Color.ColorMask[3])
+   if (st->ctx->Color.ColorMask[0][3])
       blend->colormask |= PIPE_MASK_A;
 
    if (st->ctx->Color.DitherFlag)
diff --git a/src/mesa/state_tracker/st_cb_accum.c b/src/mesa/state_tracker/st_cb_accum.c
index a6b9765452..da7b97d325 100644
--- a/src/mesa/state_tracker/st_cb_accum.c
+++ b/src/mesa/state_tracker/st_cb_accum.c
@@ -229,7 +229,7 @@ accum_return(GLcontext *ctx, GLfloat value,
 {
    struct pipe_context *pipe = ctx->st->pipe;
    struct pipe_screen *screen = pipe->screen;
-   const GLubyte *colormask = ctx->Color.ColorMask;
+   const GLubyte *colormask = ctx->Color.ColorMask[0];
    enum pipe_transfer_usage usage;
    struct pipe_transfer *color_trans;
    size_t stride = acc_strb->stride;
diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index 72b30e7c04..192d765f45 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -232,13 +232,13 @@ clear_with_quad(GLcontext *ctx,
       blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
       blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
       if (color) {
-         if (ctx->Color.ColorMask[0])
+         if (ctx->Color.ColorMask[0][0])
             blend.colormask |= PIPE_MASK_R;
-         if (ctx->Color.ColorMask[1])
+         if (ctx->Color.ColorMask[0][1])
             blend.colormask |= PIPE_MASK_G;
-         if (ctx->Color.ColorMask[2])
+         if (ctx->Color.ColorMask[0][2])
             blend.colormask |= PIPE_MASK_B;
-         if (ctx->Color.ColorMask[3])
+         if (ctx->Color.ColorMask[0][3])
             blend.colormask |= PIPE_MASK_A;
          if (st->ctx->Color.DitherFlag)
             blend.dither = 1;
@@ -300,10 +300,10 @@ check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
         ctx->Scissor.Height < rb->Height))
       return TRUE;
 
-   if (!ctx->Color.ColorMask[0] ||
-       !ctx->Color.ColorMask[1] ||
-       !ctx->Color.ColorMask[2] ||
-       !ctx->Color.ColorMask[3])
+   if (!ctx->Color.ColorMask[0][0] ||
+       !ctx->Color.ColorMask[0][1] ||
+       !ctx->Color.ColorMask[0][2] ||
+       !ctx->Color.ColorMask[0][3])
       return TRUE;
 
    return FALSE;