From bc97dab8860077834d3e0939cf97726366d7d4f5 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Wed, 3 Oct 2012 02:50:40 +0200
Subject: [PATCH] vo_opengl: don't try to map an empty buffer

The change detection signalled a full re-upload on initialization, but
no texture reallocation. Binding the uninitialized buffer caused an
OpenGL error.

Fixes error messages on start with "opengl-hq".
---
 libvo/vo_opengl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libvo/vo_opengl.c b/libvo/vo_opengl.c
index 5c3735eebc..a9bd5f67e8 100644
--- a/libvo/vo_opengl.c
+++ b/libvo/vo_opengl.c
@@ -1534,7 +1534,7 @@ static void gen_eosd(struct gl_priv *p, mp_eosd_images_t *imgs)
                                      * sizeof(struct vertex)
                                      * VERTICES_PER_QUAD);
 
-    if (need_upload && p->use_pbo) {
+    if (need_upload && p->use_pbo && p->eosd->targets_count) {
         gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, p->eosd_buffer);
         char *data = gl->MapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
         if (!data) {