[mutter] cogl/clip-stack: Set color and depth mask when drawing rectangle clips

[Carlos Garnacho <carlosg src gnome org>]

commit 46e38ff61a7357d87f17c063eae51d84c4b322a7
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Wed Feb 26 17:44:18 2020 +0100

    cogl/clip-stack: Set color and depth mask when drawing rectangle clips
    
    Just like with the other functions drawing to the stencil buffer, we
    should make sure the depth and color masks are set to FALSE during
    drawing.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1096

 cogl/cogl/driver/gl/cogl-clip-stack-gl.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/cogl/cogl/driver/gl/cogl-clip-stack-gl.c b/cogl/cogl/driver/gl/cogl-clip-stack-gl.c
index 4946f8690..24a714f6c 100644
--- a/cogl/cogl/driver/gl/cogl-clip-stack-gl.c
+++ b/cogl/cogl/driver/gl/cogl-clip-stack-gl.c
@@ -73,6 +73,9 @@ add_stencil_clip_rectangle (CoglFramebuffer *framebuffer,
   ctx->current_projection_entry = projection_stack->last_entry;
   ctx->current_modelview_entry = modelview_entry;
 
+  GE( ctx, glColorMask (FALSE, FALSE, FALSE, FALSE) );
+  GE( ctx, glDepthMask (FALSE) );
+
   if (merge)
     {
       /* Add one to every pixel of the stencil buffer in the
@@ -116,6 +119,8 @@ add_stencil_clip_rectangle (CoglFramebuffer *framebuffer,
   ctx->current_modelview_entry = old_modelview_entry;
 
   /* Restore the stencil mode */
+  GE( ctx, glDepthMask (TRUE) );
+  GE( ctx, glColorMask (TRUE, TRUE, TRUE, TRUE) );
   GE( ctx, glStencilFunc (GL_EQUAL, 0x1, 0x1) );
   GE( ctx, glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
 }