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

Like the image code, but for shader buffers this time.

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

1 files changed, 17 insertions, 1 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index 2ba9b09966..75551fbe2d 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -749,7 +749,23 @@ draw_image(struct draw_context *draw,
    }
 }
 
-
+/**
+ * Provide TGSI buffer objects for vertex/geometry shaders that use
+ * load/store/atomic ops.  This state only needs to be set once per context.
+ * This might only be used by software drivers for the time being.
+ */
+void
+draw_buffer(struct draw_context *draw,
+            uint shader,
+            struct tgsi_buffer *buffer)
+{
+   if (shader == PIPE_SHADER_VERTEX) {
+      draw->vs.tgsi.buffer = buffer;
+   } else {
+      debug_assert(shader == PIPE_SHADER_GEOMETRY);
+      draw->gs.tgsi.buffer = buffer;
+   }
+}
 
 
 void draw_set_render( struct draw_context *draw,