gallium: Implement draw_vbo and set_index_buffer for all drivers.

Some drivers define a generic function that is called by all drawing
functions.  To implement draw_vbo for such drivers, either draw_vbo
calls the generic function or the prototype of the generic function is
changed to match draw_vbo.

Other drivers have no such generic function.  draw_vbo is implemented by
calling either draw_arrays and draw_elements.

For most drivers, set_index_buffer does not mark the state dirty for
tracking.  Instead, the index buffer state is emitted whenever draw_vbo
is called, just like the case with draw_elements.  It surely can be
improved.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_pipe_vertex.c b/src/gallium/drivers/svga/svga_pipe_vertex.c
index 23808ad08e0..86c79459f3e 100644
--- a/src/gallium/drivers/svga/svga_pipe_vertex.c
+++ b/src/gallium/drivers/svga/svga_pipe_vertex.c
@@ -66,6 +66,24 @@ static void svga_set_vertex_buffers(struct pipe_context *pipe,
 }
 
 
+static void svga_set_index_buffer(struct pipe_context *pipe,
+                                  const struct pipe_index_buffer *ib)
+{
+   struct svga_context *svga = svga_context(pipe);
+
+   if (ib) {
+      pipe_resource_reference(&svga->curr.ib.buffer, ib->buffer);
+      memcpy(&svga->curr.ib, ib, sizeof(svga->curr.ib));
+   }
+   else {
+      pipe_resource_reference(&svga->curr.ib.buffer, NULL);
+      memset(&svga->curr.ib, 0, sizeof(svga->curr.ib));
+   }
+
+   /* TODO make this more like a state */
+}
+
+
 static void *
 svga_create_vertex_elements_state(struct pipe_context *pipe,
                                   unsigned count,
@@ -109,6 +127,7 @@ void svga_cleanup_vertex_state( struct svga_context *svga )
 void svga_init_vertex_functions( struct svga_context *svga )
 {
    svga->pipe.set_vertex_buffers = svga_set_vertex_buffers;
+   svga->pipe.set_index_buffer = svga_set_index_buffer;
    svga->pipe.create_vertex_elements_state = svga_create_vertex_elements_state;
    svga->pipe.bind_vertex_elements_state = svga_bind_vertex_elements_state;
    svga->pipe.delete_vertex_elements_state = svga_delete_vertex_elements_state;