intel: Buffered upload

Rather than performing lots of little writes to update the common bo
upon each update, write those into a static buffer and flush that when
full (or at the end of the batch). Doing so gives a dramatic performance
improvement over and above using mmaped access.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index a1ed462e54..0ea273837d 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -190,6 +190,9 @@ struct intel_context
    struct {
       drm_intel_bo *bo;
       GLuint offset;
+      uint16_t buffer_len;
+      uint16_t buffer_offset;
+      char buffer[4096];
    } upload;
 
    GLuint stats_wm;