mesa/st: add support for EXT_texture_swizzle.

This passes on r300g, the only bit I'm not really sure about is the handling
of the sampler_view in st_atom_texture.c, I unreference it there if the swizzle
value changes and I also have to create a new set of functions to create a new
one since the u_sampler.c ones don't handle swizzle so much.

adds r300g + softpipe enables, I think other drivers could pass easily enough.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 4093eedde9..2c2e10dead 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -248,6 +248,10 @@ void st_init_extensions(struct st_context *st)
       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
    }
 
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
+      ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
+   }
+
    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
       ctx->Extensions.ARB_vertex_shader = GL_TRUE;