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, 40 insertions, 21 deletions

diff --git a/src/gallium/drivers/failover/fo_context.c b/src/gallium/drivers/failover/fo_context.c
index 9c9c1bdc45..1048d58313 100644
--- a/src/gallium/drivers/failover/fo_context.c
+++ b/src/gallium/drivers/failover/fo_context.c
@@ -28,6 +28,7 @@
 
 #include "pipe/p_defines.h"
 #include "util/u_memory.h"
+#include "util/u_draw_quad.h"
 #include "pipe/p_context.h"
 
 #include "fo_context.h"
@@ -50,13 +51,8 @@ void failover_fail_over( struct failover_context *failover )
 }
 
 
-static void failover_draw_elements( struct pipe_context *pipe,
-                                    struct pipe_resource *indexResource,
-                                    unsigned indexSize,
-                                    int indexBias,
-                                    unsigned prim, 
-                                    unsigned start, 
-                                    unsigned count)
+static void failover_draw_vbo( struct pipe_context *pipe,
+                               const struct pipe_draw_info *info)
 {
    struct failover_context *failover = failover_context( pipe );
 
@@ -70,13 +66,7 @@ static void failover_draw_elements( struct pipe_context *pipe,
    /* Try hardware:
     */
    if (failover->mode == FO_HW) {
-      failover->hw->draw_elements( failover->hw, 
-                                   indexResource, 
-                                   indexSize, 
-                                   indexBias,
-                                   prim, 
-                                   start, 
-                                   count );
+      failover->hw->draw_vbo( failover->hw, info );
    }
 
    /* Possibly try software:
@@ -88,13 +78,7 @@ static void failover_draw_elements( struct pipe_context *pipe,
 	 failover_state_emit( failover );
       }
 
-      failover->sw->draw_elements( failover->sw, 
-				   indexResource, 
-				   indexSize, 
-				   indexBias,
-				   prim, 
-				   start, 
-				   count );
+      failover->sw->draw_vbo( failover->sw, info );
 
       /* Be ready to switch back to hardware rendering without an
        * intervening flush.  Unlikely to be much performance impact to
@@ -105,6 +89,40 @@ static void failover_draw_elements( struct pipe_context *pipe,
 }
 
 
+static void failover_draw_elements( struct pipe_context *pipe,
+                                    struct pipe_resource *indexResource,
+                                    unsigned indexSize,
+                                    int indexBias,
+                                    unsigned prim, 
+                                    unsigned start, 
+                                    unsigned count)
+{
+   struct failover_context *failover = failover_context( pipe );
+   struct pipe_draw_info info;
+   struct pipe_index_buffer saved_ib, ib;
+
+   util_draw_init_info(&info);
+   info.mode = prim;
+   info.start = start;
+   info.count = count;
+
+   if (indexResource) {
+      info.indexed = TRUE;
+      saved_ib = failover->index_buffer;
+
+      ib.buffer = indexResource;
+      ib.offset = 0;
+      ib.index_size = indexSize;
+      pipe->set_index_buffer(pipe, &ib);
+   }
+
+   failover_draw_vbo(pipe, &info);
+
+   if (indexResource)
+      pipe->set_index_buffer(pipe, &saved_ib);
+}
+
+
 static void failover_draw_arrays( struct pipe_context *pipe,
 				     unsigned prim, unsigned start, unsigned count)
 {
@@ -145,6 +163,7 @@ struct pipe_context *failover_create( struct pipe_context *hw,
 
    failover->pipe.draw_arrays = failover_draw_arrays;
    failover->pipe.draw_elements = failover_draw_elements;
+   failover->pipe.draw_vbo = failover_draw_vbo;
    failover->pipe.clear = hw->clear;
    failover->pipe.clear_render_target = hw->clear_render_target;
    failover->pipe.clear_depth_stencil = hw->clear_depth_stencil;