gallium: implement set_sample_mask() in all drivers

prevents segfault when state trackers try to set default mask.
Other option would be to make this required only for drivers
supporting multisampling, but this seems more clean.
Only dummy implementations (for normal drivers) provided (no driver
supports multisampling yet neither).

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/drivers/failover/fo_context.h b/src/gallium/drivers/failover/fo_context.h
index 88ae5ad60d5..9d3e0d0dba0 100644
--- a/src/gallium/drivers/failover/fo_context.h
+++ b/src/gallium/drivers/failover/fo_context.h
@@ -55,6 +55,7 @@
 #define FO_NEW_CLEAR_COLOR     0x20000
 #define FO_NEW_VERTEX_BUFFER   0x40000
 #define FO_NEW_VERTEX_ELEMENT  0x80000
+#define FO_NEW_SAMPLE_MASK     0x100000
 
 
 
@@ -90,6 +91,7 @@ struct failover_context {
    struct pipe_blend_color blend_color;
    struct pipe_stencil_ref stencil_ref;
    struct pipe_clip_state clip;
+   unsigned sample_mask;
    struct pipe_framebuffer_state framebuffer;
    struct pipe_poly_stipple poly_stipple;
    struct pipe_scissor_state scissor;