[intel] Add a driconf option to cache freed buffer objects for reuse.

This is defaulted off as it has potentially large memory costs for a modest
performance gain.  Ideally we will improve DRM performance to the point where
this optimization is not worth the memory cost in any case, or find some
middle ground in caching only limited numbers of certain buffers.  For now,
this provides a modest 4% improvement in openarena on GM965 and 10% in openarena
on GM945.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index 6c97955b145..809cb6ea578 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -476,6 +476,11 @@ extern void intelInitStateFuncs(struct dd_function_table *functions);
 #define BLENDFACT_INV_CONST_ALPHA	0x0f
 #define BLENDFACT_MASK          	0x0f
 
+enum {
+   DRI_CONF_BO_REUSE_DISABLED,
+   DRI_CONF_BO_REUSE_ALL
+};
+
 extern int intel_translate_shadow_compare_func(GLenum func);
 extern int intel_translate_compare_func(GLenum func);
 extern int intel_translate_stencil_op(GLenum op);