draw: add support for passing images to vs/gs shaders.

This just adds support for passing through images to the
tgsi execution stage.

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index 16a261c14c..2ba9b09966 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -731,6 +731,24 @@ draw_texture_sampler(struct draw_context *draw,
    }
 }
 
+/**
+ * Provide TGSI image objects for vertex/geometry shaders that use
+ * texture fetches.  This state only needs to be set once per context.
+ * This might only be used by software drivers for the time being.
+ */
+void
+draw_image(struct draw_context *draw,
+           uint shader,
+           struct tgsi_image *image)
+{
+   if (shader == PIPE_SHADER_VERTEX) {
+      draw->vs.tgsi.image = image;
+   } else {
+      debug_assert(shader == PIPE_SHADER_GEOMETRY);
+      draw->gs.tgsi.image = image;
+   }
+}
+