Mesa (master): st/mesa: Use PIPE_USAGE_STAGING for GL_STATIC/DYNAMIC/ STREAM_READ buffers

[Michel Dänzer]

Module: Mesa
Branch: master
Commit: 7e55c3b352b6616fa2780f683dd6c8e1a3f61815
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7e55c3b352b6616fa2780f683dd6c8e1a3f61815

Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Sep 25 15:29:56 2014 +0900

st/mesa: Use PIPE_USAGE_STAGING for GL_STATIC/DYNAMIC/STREAM_READ buffers

Such buffers can only be useful by reading from them with the CPU, so we
need to make sure CPU reads are fast.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84178
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Cc: mesa-stable at lists.freedesktop.org

---

 src/mesa/state_tracker/st_cb_bufferobjects.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c
index e0cb979..d53602c 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -246,21 +246,23 @@ st_bufferobj_data(struct gl_context *ctx,
       /* BufferData */
       switch (usage) {
       case GL_STATIC_DRAW:
-      case GL_STATIC_READ:
       case GL_STATIC_COPY:
       default:
 	 pipe_usage = PIPE_USAGE_DEFAULT;
          break;
       case GL_DYNAMIC_DRAW:
-      case GL_DYNAMIC_READ:
       case GL_DYNAMIC_COPY:
          pipe_usage = PIPE_USAGE_DYNAMIC;
          break;
       case GL_STREAM_DRAW:
-      case GL_STREAM_READ:
       case GL_STREAM_COPY:
          pipe_usage = PIPE_USAGE_STREAM;
          break;
+      case GL_STATIC_READ:
+      case GL_DYNAMIC_READ:
+      case GL_STREAM_READ:
+         pipe_usage = PIPE_USAGE_STAGING;
+         break;
       }
    }