st/mesa: attempt to fix TFP by using sampler views (v1)

Okay I think this is good enough for now, I can't see any other reason
for mesa to want to use a sampler view so lets just leave it at all the A->X conversions for now.

I've been running gnome-shell under r300g with this for day or so and it seems fine.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_format.c b/src/mesa/state_tracker/st_format.c
index f7b10ea243..c9fa7a62e1 100644
--- a/src/mesa/state_tracker/st_format.c
+++ b/src/mesa/state_tracker/st_format.c
@@ -767,3 +767,36 @@ st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
       return GL_FALSE;
    }
 }
+
+GLboolean
+st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
+{
+   if (format1 == format2)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
+       format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
+       format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
+       format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
+       format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
+       format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
+       format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
+      return GL_TRUE;
+
+   return GL_FALSE;
+}