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, 18 insertions, 0 deletions

diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index 3e221f2e02d..bccd7d78591 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -1505,6 +1505,23 @@ static void r300_set_vertex_buffers(struct pipe_context* pipe,
     r300->vertex_buffer_count = count;
 }
 
+static void r300_set_index_buffer(struct pipe_context* pipe,
+                                  const struct pipe_index_buffer *ib)
+{
+    struct r300_context* r300 = r300_context(pipe);
+
+    if (ib) {
+        pipe_resource_reference(&r300->index_buffer.buffer, ib->buffer);
+        memcpy(&r300->index_buffer, ib, sizeof(r300->index_buffer));
+    }
+    else {
+        pipe_resource_reference(&r300->index_buffer.buffer, NULL);
+        memset(&r300->index_buffer, 0, sizeof(r300->index_buffer));
+    }
+
+    /* TODO make this more like a state */
+}
+
 /* Initialize the PSC tables. */
 static void r300_vertex_psc(struct r300_vertex_element_state *velems)
 {
@@ -1852,6 +1869,7 @@ void r300_init_state_functions(struct r300_context* r300)
     r300->context.set_viewport_state = r300_set_viewport_state;
 
     r300->context.set_vertex_buffers = r300_set_vertex_buffers;
+    r300->context.set_index_buffer = r300_set_index_buffer;
 
     r300->context.create_vertex_elements_state = r300_create_vertex_elements_state;
     r300->context.bind_vertex_elements_state = r300_bind_vertex_elements_state;