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, 22 insertions, 0 deletions

diff --git a/src/gallium/drivers/r300/r300_render_stencilref.c b/src/gallium/drivers/r300/r300_render_stencilref.c
index 9a6b4e12ff..6d801cf159 100644
--- a/src/gallium/drivers/r300/r300_render_stencilref.c
+++ b/src/gallium/drivers/r300/r300_render_stencilref.c
@@ -42,6 +42,9 @@ struct r300_stencilref_context {
         unsigned indexSize, int indexBias, unsigned minIndex, unsigned maxIndex,
         unsigned mode, unsigned start, unsigned count);
 
+    void (*draw_vbo)(struct pipe_context *pipe,
+                     const struct pipe_draw_info *info);
+
     uint32_t rs_cull_mode;
     uint32_t zb_stencilrefmask;
     ubyte ref_value_front;
@@ -144,6 +147,23 @@ static void r300_stencilref_draw_range_elements(
     }
 }
 
+static void r300_stencilref_draw_vbo(struct pipe_context *pipe,
+                                     const struct pipe_draw_info *info)
+{
+    struct r300_context *r300 = r300_context(pipe);
+    struct r300_stencilref_context *sr = r300->stencilref_fallback;
+
+    if (!r300_stencilref_needed(r300)) {
+        sr->draw_vbo(pipe, info);
+    } else {
+        r300_stencilref_begin(r300);
+        sr->draw_vbo(pipe, info);
+        r300_stencilref_switch_side(r300);
+        sr->draw_vbo(pipe, info);
+        r300_stencilref_end(r300);
+    }
+}
+
 void r300_plug_in_stencil_ref_fallback(struct r300_context *r300)
 {
     r300->stencilref_fallback = CALLOC_STRUCT(r300_stencilref_context);
@@ -151,8 +171,10 @@ void r300_plug_in_stencil_ref_fallback(struct r300_context *r300)
     /* Save original draw functions. */
     r300->stencilref_fallback->draw_arrays = r300->context.draw_arrays;
     r300->stencilref_fallback->draw_range_elements = r300->context.draw_range_elements;
+    r300->stencilref_fallback->draw_vbo = r300->context.draw_vbo;
 
     /* Override the draw functions. */
     r300->context.draw_arrays = r300_stencilref_draw_arrays;
     r300->context.draw_range_elements = r300_stencilref_draw_range_elements;
+    r300->context.draw_vbo = r300_stencilref_draw_vbo;
 }