allocate larger minimum dstelt buffer

increase the minimum dstelt buffer size to avoid triggering an assertion later
because the split is triggered before the buffer is full. This fixes cases
where the vbo_split_copy path is hit because of maximum index limit, where the
dstelt buffer size needed could be very small (doom3 hit that assertion with a
vertex count of just 3)

diff --git a/src/mesa/vbo/vbo_split_copy.c b/src/mesa/vbo/vbo_split_copy.c
index df69e4ca28fb1d1db654fb274222c3b8b5007273..d9c58537821cfb24d9cf392a68ebd58a49f7235d 100644 (file)
--- a/src/mesa/vbo/vbo_split_copy.c
+++ b/src/mesa/vbo/vbo_split_copy.c
@@ -466,7 +466,7 @@ static void replay_init( struct copy_context *copy )
    /* Allocate an output element list:
     */
    copy->dstelt_size = MIN2(65536,
-                           copy->ib->count * 2);
+                           copy->ib->count * 2 + 3);
    copy->dstelt_size = MIN2(copy->dstelt_size,
                            copy->limits->max_indices);
    copy->dstelt = _mesa_malloc(sizeof(GLuint) * copy->dstelt_size);