intel: extend current vertex buffers

If the next vertex arrays are a (discontiguous) continuation of the
current arrays, such that the new vertices are simply offset from the
start of the current vertex buffer definitions we can reuse those
defintions and avoid the overhead of relocations and invalidations.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 12 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 03cce5154c..957acd26a2 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -489,16 +489,26 @@ struct brw_context
    struct {
       struct brw_vertex_element inputs[VERT_ATTRIB_MAX];
       struct brw_vertex_buffer buffers[VERT_ATTRIB_MAX];
+      struct {
+	      uint32_t handle;
+	      uint32_t offset;
+	      uint32_t stride;
+      } current_buffers[VERT_ATTRIB_MAX];
 
       struct brw_vertex_element *enabled[VERT_ATTRIB_MAX];
       GLuint nr_enabled;
-      GLuint nr_buffers;
+      GLuint nr_buffers, nr_current_buffers;
 
       /* Summary of size and varying of active arrays, so we can check
        * for changes to this state:
        */
       struct brw_vertex_info info;
       unsigned int min_index, max_index;
+
+      /* Offset from start of vertex buffer so we can avoid redefining
+       * the same VB packed over and over again.
+       */
+      unsigned int start_vertex_bias;
    } vb;
 
    struct {
@@ -512,6 +522,7 @@ struct brw_context
       /* Updates to these fields are signaled by BRW_NEW_INDEX_BUFFER. */
       drm_intel_bo *bo;
       unsigned int offset;
+
       /* Offset to index buffer index to use in CMD_3D_PRIM so that we can
        * avoid re-uploading the IB packet over and over if we're actually
        * referencing the same index buffer.
@@ -832,4 +843,3 @@ float convert_param(enum param_conversion conversion, float param)
 GLboolean brw_do_cubemap_normalize(struct exec_list *instructions);
 
 #endif
-