[Mesa-dev] [PATCH] gallium: add PIPE_BIND_BLENDABLE flag

[Christoph Bumiller]

This is required for d3d1x's CheckFormatSupport query.

It also seems generally useful for state trackers, which could
choose alternative rendering paths or formats if blending would
come at a significant performance loss.
---
 src/gallium/docs/source/screen.rst   |    3 +++
 src/gallium/include/pipe/p_defines.h |    9 +++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 924858e..4a61835 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -160,6 +160,9 @@ resources might be created and handled quite differently.
 * ``PIPE_BIND_DEPTH_STENCIL``: A depth (Z) buffer and/or stencil buffer. Any
   depth/stencil surface/resource attached to pipe_framebuffer_state::zsbuf must
   have this flag set.
+* ``PIPE_BIND_BLENDABLE``: Used in conjunction with PIPE_BIND_RENDER_TARGET to query
+  whether a device supports blending for a given format.
+  If surface creation succeeds with this flag set, the driver must emulate blending.
 * ``PIPE_BIND_DISPLAY_TARGET``: A surface that can be presented to screen. Arguments to
   pipe_screen::flush_front_buffer must have this flag set.
 * ``PIPE_BIND_SAMPLER_VIEW``: A texture that may be sampled from in a fragment
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index acae4b1..447df35 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -295,10 +295,11 @@ enum pipe_transfer_usage {
  */
 #define PIPE_BIND_DEPTH_STENCIL        (1 << 0) /* create_surface */
 #define PIPE_BIND_RENDER_TARGET        (1 << 1) /* create_surface */
-#define PIPE_BIND_SAMPLER_VIEW         (1 << 2) /* create_sampler_view */
-#define PIPE_BIND_VERTEX_BUFFER        (1 << 3) /* set_vertex_buffers */
-#define PIPE_BIND_INDEX_BUFFER         (1 << 4) /* draw_elements */
-#define PIPE_BIND_CONSTANT_BUFFER      (1 << 5) /* set_constant_buffer */
+#define PIPE_BIND_BLENDABLE            (1 << 2) /* create_surface */
+#define PIPE_BIND_SAMPLER_VIEW         (1 << 3) /* create_sampler_view */
+#define PIPE_BIND_VERTEX_BUFFER        (1 << 4) /* set_vertex_buffers */
+#define PIPE_BIND_INDEX_BUFFER         (1 << 5) /* draw_elements */
+#define PIPE_BIND_CONSTANT_BUFFER      (1 << 6) /* set_constant_buffer */
 #define PIPE_BIND_DISPLAY_TARGET       (1 << 8) /* flush_front_buffer */
 #define PIPE_BIND_TRANSFER_WRITE       (1 << 9) /* get_transfer */
 #define PIPE_BIND_TRANSFER_READ        (1 << 10) /* get_transfer */
-- 
1.7.3.4