From 5568a7d30120d830c93494a7b3382bfa8b4d2800 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 17 Aug 2007 15:26:33 +0100
Subject: [PATCH] added vbo_use_buffer_objects() to specify that immediate mode
 data should be put into bufferobjects

---
 src/mesa/vbo/vbo.h           |  3 +++
 src/mesa/vbo/vbo_exec_api.c  | 35 +++++++++++++++++++++++++++++++++++
 src/mesa/vbo/vbo_exec_draw.c | 17 ++++++++++++++---
 3 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/src/mesa/vbo/vbo.h b/src/mesa/vbo/vbo.h
index 04c59c0..4c51b44 100644
--- a/src/mesa/vbo/vbo.h
+++ b/src/mesa/vbo/vbo.h
@@ -114,4 +114,7 @@ void vbo_rebase_prims( GLcontext *ctx,
 		       vbo_draw_func draw );
 
 
+void vbo_use_buffer_objects(GLcontext *ctx);
+
+
 #endif
diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c
index 7f56b3b..24e2eba 100644
--- a/src/mesa/vbo/vbo_exec_api.c
+++ b/src/mesa/vbo/vbo_exec_api.c
@@ -631,6 +631,41 @@ static void vbo_exec_vtxfmt_init( struct vbo_exec_context *exec )
 }
 
 
+/**
+ * Tell the VBO module to use a real OpenGL vertex buffer object to
+ * store accumulated immediate-mode vertex data.
+ * This replaces the malloced buffer which was created in
+ * vb_exec_vtx_init() below.
+ */
+void vbo_use_buffer_objects(GLcontext *ctx)
+{
+   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
+   /* Any buffer name but 0 can be used here since this bufferobj won't
+    * go into the bufferobj hashtable.
+    */
+   GLuint bufName = 0xaabbccdd;
+   GLenum target = GL_ARRAY_BUFFER_ARB;
+   GLenum access = GL_READ_WRITE_ARB;
+   GLenum usage = GL_STREAM_DRAW_ARB;
+   GLsizei size = VBO_VERT_BUFFER_SIZE * sizeof(GLfloat);
+
+   /* Make sure this func is only used once */
+   assert(exec->vtx.bufferobj == ctx->Array.NullBufferObj);
+   if (exec->vtx.buffer_map) {
+      _mesa_align_free(exec->vtx.buffer_map);
+   }
+
+   /* Allocate a real buffer object now */
+   exec->vtx.bufferobj = ctx->Driver.NewBufferObject(ctx, bufName, target);
+   ctx->Driver.BufferData(ctx, target, size, NULL, usage, exec->vtx.bufferobj);
+
+   /* and map it */
+   exec->vtx.buffer_map
+      = ctx->Driver.MapBuffer(ctx, target, access, exec->vtx.bufferobj);
+}
+
+
+
 void vbo_exec_vtx_init( struct vbo_exec_context *exec )
 {
    GLcontext *ctx = exec->ctx;
diff --git a/src/mesa/vbo/vbo_exec_draw.c b/src/mesa/vbo/vbo_exec_draw.c
index 0ef26cd..68aba1d 100644
--- a/src/mesa/vbo/vbo_exec_draw.c
+++ b/src/mesa/vbo/vbo_exec_draw.c
@@ -175,16 +175,27 @@ static void vbo_exec_bind_arrays( GLcontext *ctx )
     * arrays of floats.
     */
    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
-      GLuint src = map[attr];
+      const GLuint src = map[attr];
 
       if (exec->vtx.attrsz[src]) {
-	 arrays[attr].Ptr = (void *)data;
+         if (exec->vtx.bufferobj->Name) {
+            /* a real buffer obj: Ptr is an offset, not a pointer*/
+            int offset;
+            assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
+            offset = (GLbyte *) data - (GLbyte *) exec->vtx.bufferobj->Pointer;
+            assert(offset >= 0);
+            arrays[attr].Ptr = (void *) offset;
+         }
+         else {
+            /* Ptr into ordinary app memory */
+            arrays[attr].Ptr = (void *) data;
+         }
 	 arrays[attr].Size = exec->vtx.attrsz[src];
 	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 	 arrays[attr].Type = GL_FLOAT;
 	 arrays[attr].Enabled = 1;
-	 arrays[attr].BufferObj = exec->vtx.bufferobj; /* NullBufferObj */
+	 arrays[attr].BufferObj = exec->vtx.bufferobj;
 	 arrays[attr]._MaxElement = count; /* ??? */
 
 	 data += exec->vtx.attrsz[attr] * sizeof(GLfloat);
-- 
2.7.4