vbo: Avoid the copy to current in dlists if not required.

The current state is allowed to be undefined past DrawElements et al.
Consequently omit that copying at least in the display list code.
This pays us some percents performance.

Signed-off-by: Brian Paul <brianp@vmware.com>

1 files changed, 31 insertions, 23 deletions

diff --git a/src/mesa/vbo/vbo_save_api.c b/src/mesa/vbo/vbo_save_api.c
index 817d478e2ac..bf5ceda78f8 100644
--- a/src/mesa/vbo/vbo_save_api.c
+++ b/src/mesa/vbo/vbo_save_api.c
@@ -294,26 +294,30 @@ static void _save_compile_vertex_list( struct gl_context *ctx )
    node->vertex_store->refcount++;
    node->prim_store->refcount++;
 
-
-   node->current_size = node->vertex_size - node->attrsz[0];
-   node->current_data = NULL;
-
-   if (node->current_size) {
-      /* If the malloc fails, we just pull the data out of the VBO
-       * later instead.
-       */
-      node->current_data = MALLOC( node->current_size * sizeof(GLfloat) );
-      if (node->current_data) {
-         const char *buffer = (const char *)save->vertex_store->buffer;
-         unsigned attr_offset = node->attrsz[0] * sizeof(GLfloat);
-         unsigned vertex_offset = 0;
-
-         if (node->count)
-            vertex_offset = (node->count-1) * node->vertex_size * sizeof(GLfloat);
-
-         memcpy( node->current_data,
-                 buffer + node->buffer_offset + vertex_offset + attr_offset,
-                 node->current_size * sizeof(GLfloat) );
+   if (node->prim[0].no_current_update) {
+      node->current_size = 0;
+      node->current_data = NULL;
+   } else {
+      node->current_size = node->vertex_size - node->attrsz[0];
+      node->current_data = NULL;
+     
+      if (node->current_size) {
+         /* If the malloc fails, we just pull the data out of the VBO
+          * later instead.
+          */
+         node->current_data = MALLOC( node->current_size * sizeof(GLfloat) );
+         if (node->current_data) {
+            const char *buffer = (const char *)save->vertex_store->buffer;
+            unsigned attr_offset = node->attrsz[0] * sizeof(GLfloat);
+            unsigned vertex_offset = 0;
+            
+            if (node->count)
+               vertex_offset = (node->count-1) * node->vertex_size * sizeof(GLfloat);
+         
+            memcpy( node->current_data,
+                    buffer + node->buffer_offset + vertex_offset + attr_offset,
+                    node->current_size * sizeof(GLfloat) );
+         }
       }
    }
 
@@ -397,6 +401,7 @@ static void _save_wrap_buffers( struct gl_context *ctx )
    GLint i = save->prim_count - 1;
    GLenum mode;
    GLboolean weak;
+   GLboolean no_current_update;
 
    assert(i < (GLint) save->prim_max);
    assert(i >= 0);
@@ -407,6 +412,7 @@ static void _save_wrap_buffers( struct gl_context *ctx )
 			  save->prim[i].start);
    mode = save->prim[i].mode;
    weak = save->prim[i].weak;
+   no_current_update = save->prim[i].no_current_update;
    
    /* store the copied vertices, and allocate a new list.
     */
@@ -416,6 +422,7 @@ static void _save_wrap_buffers( struct gl_context *ctx )
     */
    save->prim[0].mode = mode;
    save->prim[0].weak = weak;
+   save->prim[0].no_current_update = no_current_update;
    save->prim[0].begin = 0;
    save->prim[0].end = 0;
    save->prim[0].pad = 0;
@@ -770,10 +777,11 @@ GLboolean vbo_save_NotifyBegin( struct gl_context *ctx, GLenum mode )
    GLuint i = save->prim_count++;
 
    assert(i < save->prim_max);
-   save->prim[i].mode = mode & ~VBO_SAVE_PRIM_WEAK;
+   save->prim[i].mode = mode & VBO_SAVE_PRIM_MODE_MASK;
    save->prim[i].begin = 1;
    save->prim[i].end = 0;
    save->prim[i].weak = (mode & VBO_SAVE_PRIM_WEAK) ? 1 : 0;
+   save->prim[i].no_current_update = (mode & VBO_SAVE_PRIM_NO_CURRENT_UPDATE) ? 1 : 0;
    save->prim[i].pad = 0;
    save->prim[i].start = save->vert_count;
    save->prim[i].count = 0;   
@@ -934,7 +942,7 @@ static void GLAPIENTRY _save_OBE_DrawArrays(GLenum mode, GLint start, GLsizei co
 
    _ae_map_vbos( ctx );
 
-   vbo_save_NotifyBegin( ctx, mode | VBO_SAVE_PRIM_WEAK );
+   vbo_save_NotifyBegin( ctx, mode | VBO_SAVE_PRIM_WEAK | VBO_SAVE_PRIM_NO_CURRENT_UPDATE);
 
    for (i = 0; i < count; i++)
        CALL_ArrayElement(GET_DISPATCH(), (start + i));
@@ -960,7 +968,7 @@ static void GLAPIENTRY _save_OBE_DrawElements(GLenum mode, GLsizei count, GLenum
    if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj))
       indices = ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Pointer, indices);
 
-   vbo_save_NotifyBegin( ctx, mode | VBO_SAVE_PRIM_WEAK );
+   vbo_save_NotifyBegin( ctx, mode | VBO_SAVE_PRIM_WEAK | VBO_SAVE_PRIM_NO_CURRENT_UPDATE );
 
    switch (type) {
    case GL_UNSIGNED_BYTE: