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, 31 insertions, 0 deletions

diff --git a/src/gallium/drivers/nv50/nv50_vbo.c b/src/gallium/drivers/nv50/nv50_vbo.c
index 864cb09352a..11ffc182c2d 100644
--- a/src/gallium/drivers/nv50/nv50_vbo.c
+++ b/src/gallium/drivers/nv50/nv50_vbo.c
@@ -473,6 +473,37 @@ nv50_draw_elements(struct pipe_context *pipe,
 				     mode, start, count, 0, 1);
 }
 
+void
+nv50_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
+{
+	struct nv50_context *nv50 = nv50_context(pipe);
+
+	if (info->indexed && nv50->idxbuf.buffer) {
+		unsigned offset;
+
+		assert(nv50->idxbuf.offset % nv50->idxbuf.index_size == 0);
+		offset = nv50->idxbuf.offset / nv50->idxbuf.index_size;
+
+		nv50_draw_elements_instanced(pipe,
+					     nv50->idxbuf.buffer,
+					     nv50->idxbuf.index_size,
+					     info->index_bias,
+					     info->mode,
+					     info->start + offset,
+					     info->count,
+					     info->start_instance,
+					     info->instance_count);
+	}
+	else {
+		nv50_draw_arrays_instanced(pipe,
+					   info->mode,
+					   info->start,
+					   info->count,
+					   info->start_instance,
+					   info->instance_count);
+	}
+}
+
 static INLINE boolean
 nv50_vbo_static_attrib(struct nv50_context *nv50, unsigned attrib,
 		       struct nouveau_stateobj **pso,