Implement draw_arrays_instanced() in softpipe.

Modify the translate module to respect instance divisors and accept
instance id as a parameter to calculate input vertex offset.

3 files changed, 60 insertions, 0 deletions

diff --git a/src/gallium/drivers/softpipe/sp_context.c b/src/gallium/drivers/softpipe/sp_context.c
index 2a33587b5a..406414ae3d 100644
--- a/src/gallium/drivers/softpipe/sp_context.c
+++ b/src/gallium/drivers/softpipe/sp_context.c
@@ -238,6 +238,7 @@ softpipe_create( struct pipe_screen *screen )
    softpipe->pipe.draw_arrays = softpipe_draw_arrays;
    softpipe->pipe.draw_elements = softpipe_draw_elements;
    softpipe->pipe.draw_range_elements = softpipe_draw_range_elements;
+   softpipe->pipe.draw_arrays_instanced = softpipe_draw_arrays_instanced;
 
    softpipe->pipe.clear = softpipe_clear;
    softpipe->pipe.flush = softpipe_flush;
diff --git a/src/gallium/drivers/softpipe/sp_draw_arrays.c b/src/gallium/drivers/softpipe/sp_draw_arrays.c
index 518ef8806e..6a593fb06a 100644
--- a/src/gallium/drivers/softpipe/sp_draw_arrays.c
+++ b/src/gallium/drivers/softpipe/sp_draw_arrays.c
@@ -184,3 +184,54 @@ softpipe_draw_elements(struct pipe_context *pipe,
                                         0, 0xffffffff,
                                         mode, start, count );
 }
+
+boolean
+softpipe_draw_arrays_instanced(struct pipe_context *pipe,
+                               unsigned mode,
+                               unsigned start,
+                               unsigned count,
+                               unsigned startInstance,
+                               unsigned instanceCount)
+{
+   struct softpipe_context *sp = softpipe_context(pipe);
+   struct draw_context *draw = sp->draw;
+   unsigned i;
+
+   sp->reduced_api_prim = u_reduced_prim(mode);
+
+   if (sp->dirty) {
+      softpipe_update_derived(sp);
+   }
+
+   softpipe_map_transfers(sp);
+   softpipe_map_constant_buffers(sp);
+
+   /* Map vertex buffers */
+   for (i = 0; i < sp->num_vertex_buffers; i++) {
+      void *buf;
+
+      buf = pipe_buffer_map(pipe->screen,
+                            sp->vertex_buffer[i].buffer,
+                            PIPE_BUFFER_USAGE_CPU_READ);
+      draw_set_mapped_vertex_buffer(draw, i, buf);
+   }
+
+   draw_set_mapped_element_buffer_range(draw, 0, start,
+                                        start + count - 1, NULL);
+
+   /* draw! */
+   draw_arrays_instanced(draw, mode, start, count, startInstance, instanceCount);
+
+   /* unmap vertex/index buffers - will cause draw module to flush */
+   for (i = 0; i < sp->num_vertex_buffers; i++) {
+      draw_set_mapped_vertex_buffer(draw, i, NULL);
+      pipe_buffer_unmap(pipe->screen, sp->vertex_buffer[i].buffer);
+   }
+
+   /* Note: leave drawing surfaces mapped */
+   softpipe_unmap_constant_buffers(sp);
+
+   sp->dirty_render_cache = TRUE;
+
+   return TRUE;
+}
diff --git a/src/gallium/drivers/softpipe/sp_state.h b/src/gallium/drivers/softpipe/sp_state.h
index 26d5c3fbb2..13935fd799 100644
--- a/src/gallium/drivers/softpipe/sp_state.h
+++ b/src/gallium/drivers/softpipe/sp_state.h
@@ -189,6 +189,14 @@ softpipe_draw_range_elements(struct pipe_context *pipe,
                              unsigned max_index,
                              unsigned mode, unsigned start, unsigned count);
 
+boolean
+softpipe_draw_arrays_instanced(struct pipe_context *pipe,
+                               unsigned mode,
+                               unsigned start,
+                               unsigned count,
+                               unsigned startInstance,
+                               unsigned instanceCount);
+
 void
 softpipe_map_transfers(struct softpipe_context *sp);