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.

4 files changed, 50 insertions, 0 deletions

diff --git a/src/gallium/drivers/nv50/nv50_context.c b/src/gallium/drivers/nv50/nv50_context.c
index 915a925402..3fc39c1137 100644
--- a/src/gallium/drivers/nv50/nv50_context.c
+++ b/src/gallium/drivers/nv50/nv50_context.c
@@ -86,6 +86,7 @@ nv50_create(struct pipe_screen *pscreen, void *priv)
 	nv50->pipe.draw_arrays_instanced = nv50_draw_arrays_instanced;
 	nv50->pipe.draw_elements = nv50_draw_elements;
 	nv50->pipe.draw_elements_instanced = nv50_draw_elements_instanced;
+	nv50->pipe.draw_vbo = nv50_draw_vbo;
 	nv50->pipe.clear = nv50_clear;
 
 	nv50->pipe.flush = nv50_flush;
diff --git a/src/gallium/drivers/nv50/nv50_context.h b/src/gallium/drivers/nv50/nv50_context.h
index 12c4a93a9b..a7c2b5d487 100644
--- a/src/gallium/drivers/nv50/nv50_context.h
+++ b/src/gallium/drivers/nv50/nv50_context.h
@@ -148,6 +148,7 @@ struct nv50_context {
 	struct pipe_resource *constbuf[PIPE_SHADER_TYPES];
 	struct pipe_vertex_buffer vtxbuf[PIPE_MAX_ATTRIBS];
 	unsigned vtxbuf_nr;
+	struct pipe_index_buffer idxbuf;
 	struct nv50_vtxelt_stateobj *vtxelt;
 	struct nv50_sampler_stateobj *sampler[3][PIPE_MAX_SAMPLERS];
 	unsigned sampler_nr[3];
@@ -197,6 +198,8 @@ extern void nv50_draw_elements_instanced(struct pipe_context *pipe,
 					 unsigned count,
 					 unsigned startInstance,
 					 unsigned instanceCount);
+extern void nv50_draw_vbo(struct pipe_context *pipe,
+                          const struct pipe_draw_info *info);
 extern void nv50_vtxelt_construct(struct nv50_vtxelt_stateobj *cso);
 extern struct nouveau_stateobj *nv50_vbo_validate(struct nv50_context *nv50);
 
diff --git a/src/gallium/drivers/nv50/nv50_state.c b/src/gallium/drivers/nv50/nv50_state.c
index 42c5a58318..ec0c0ff283 100644
--- a/src/gallium/drivers/nv50/nv50_state.c
+++ b/src/gallium/drivers/nv50/nv50_state.c
@@ -742,6 +742,20 @@ nv50_set_vertex_buffers(struct pipe_context *pipe, unsigned count,
 	nv50->dirty |= NV50_NEW_ARRAYS;
 }
 
+static void
+nv50_set_index_buffer(struct pipe_context *pipe,
+		      const struct pipe_index_buffer *ib)
+{
+	struct nv50_context *nv50 = nv50_context(pipe);
+
+	if (ib)
+		memcpy(&nv50->idxbuf, ib, sizeof(nv50->idxbuf));
+	else
+		memset(&nv50->idxbuf, 0, sizeof(nv50->idxbuf));
+
+	/* TODO make this more like a state */
+}
+
 static void *
 nv50_vtxelts_state_create(struct pipe_context *pipe,
 			  unsigned num_elements,
@@ -827,5 +841,6 @@ nv50_init_state_functions(struct nv50_context *nv50)
 	nv50->pipe.bind_vertex_elements_state = nv50_vtxelts_state_bind;
 
 	nv50->pipe.set_vertex_buffers = nv50_set_vertex_buffers;
+	nv50->pipe.set_index_buffer = nv50_set_index_buffer;
 }
 
diff --git a/src/gallium/drivers/nv50/nv50_vbo.c b/src/gallium/drivers/nv50/nv50_vbo.c
index 864cb09352..11ffc182c2 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,