1 files changed, 4 insertions, 1 deletions
diff --git a/vbo.c b/vbo.c
index dd1e429..bde84ba 100644
--- a/vbo.c
+++ b/vbo.c
@@ -90,7 +90,7 @@ static int gltGenVBOInterleaved(GLuint *bufferobjects, float *vert_arr,
         return -1;
     }
 
-    /* build interleaved data structure, may not be cache friendly */
+    /* build interleaved data structure, seems cache friendly */
     int i;
     for (i = 0; i < slices_n; i++)
     {
@@ -125,6 +125,9 @@ static int gltGenVBOInterleaved(GLuint *bufferobjects, float *vert_arr,
 
 static int gltDrawVBOInterleaved(GLuint *bufferobjects, size_t indices_n, GLenum mode)
 {
+    if (!bufferobjects || !indices_n)
+        return -1;
+
     glEnableClientState(GL_VERTEX_ARRAY);
     glEnableClientState(GL_NORMAL_ARRAY);
     glEnableClientState(GL_TEXTURE_COORD_ARRAY);