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>

3 files changed, 36 insertions, 25 deletions

diff --git a/src/mesa/vbo/vbo.h b/src/mesa/vbo/vbo.h
index c1406b250a..79f7665535 100644
--- a/src/mesa/vbo/vbo.h
+++ b/src/mesa/vbo/vbo.h
@@ -40,7 +40,8 @@ struct _mesa_prim {
    GLuint begin:1;
    GLuint end:1;
    GLuint weak:1;
-   GLuint pad:20;
+   GLuint no_current_update:1;
+   GLuint pad:19;
 
    GLuint start;
    GLuint count;
diff --git a/src/mesa/vbo/vbo_save.h b/src/mesa/vbo/vbo_save.h
index f5a407ced1..23cbea2afc 100644
--- a/src/mesa/vbo/vbo_save.h
+++ b/src/mesa/vbo/vbo_save.h
@@ -96,7 +96,9 @@ struct vbo_save_vertex_list {
  */
 #define VBO_SAVE_BUFFER_SIZE (8*1024) /* dwords */
 #define VBO_SAVE_PRIM_SIZE   128
-#define VBO_SAVE_PRIM_WEAK 0x40
+#define VBO_SAVE_PRIM_MODE_MASK         0x3f
+#define VBO_SAVE_PRIM_WEAK              0x40
+#define VBO_SAVE_PRIM_NO_CURRENT_UPDATE 0x80
 
 #define VBO_SAVE_FALLBACK    0x10000000
 
diff --git a/src/mesa/vbo/vbo_save_api.c b/src/mesa/vbo/vbo_save_api.c
index 817d478e2a..bf5ceda78f 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: