1 files changed, 14 insertions, 0 deletions
diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c
index 749a5ebe65a..5b1549d96de 100644
--- a/src/mesa/vbo/vbo_exec_api.c
+++ b/src/mesa/vbo/vbo_exec_api.c
@@ -458,6 +458,20 @@ vbo_exec_begin_vertices(struct gl_context *ctx)
 
 
 /**
+ * If index=0, does glVertexAttrib*() alias glVertex() to emit a vertex?
+ * It depends on a few things, including whether we're inside or outside
+ * of glBegin/glEnd.
+ */
+static inline bool
+is_vertex_position(const struct gl_context *ctx, GLuint index)
+{
+   return (index == 0 &&
+           _mesa_attr_zero_aliases_vertex(ctx) &&
+           _mesa_inside_begin_end(ctx));
+}
+
+
+/**
  * This macro is used to implement all the glVertex, glColor, glTexCoord,
  * glVertexAttrib, etc functions.
  * \param A  VBO_ATTRIB_x attribute index