How about this?
I'm using it locally for nv40 immediate mode vertex emission.
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -236,6 +236,8 @@ enum pipe_transfer_usage {
#define PIPE_BUFFER_USAGE_VERTEX (1 << 5)
#define PIPE_BUFFER_USAGE_INDEX (1 << 6)
#define PIPE_BUFFER_USAGE_CONSTANT (1 << 7)
+#define PIPE_BUFFER_USAGE_DYNAMIC (1 << 8)
+#define PIPE_BUFFER_USAGE_STREAM (1 << 9)
/*
* CPU access flags.
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -182,6 +182,16 @@ st_bufferobj_data(GLcontext *ctx,
buffer_usage = 0;
}
+ if (!(usage & 1)) // not READ
+ buffer_usage |= PIPE_BUFFER_USAGE_CPU_WRITE;
+ if (usage & 3) // READ or COPY
+ buffer_usage |= PIPE_BUFFER_USAGE_CPU_READ;
+
+ if(usage >= GL_DYNAMIC_DRAW)
+ buffer_usage |= PIPE_BUFFER_USAGE_DYNAMIC;
+ else if(usage < GL_STATIC_DRAW)
+ buffer_usage |= PIPE_BUFFER_USAGE_STREAM;
+
pipe_buffer_reference( &st_obj->buffer, NULL );
if (size != 0) {
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