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@amd.com>
Cc: mesa-stable@lists.freedesktop.org

diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c
index e0cb979f2313dcfa8b01540857e0ebbcb2fe2ef0..d53602c8b5a24cb6c4e7755e0bf5d18ea32bf319 100644 (file)
--- 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;
       }
    }