vo_opengl: avoid broken shader if hwdec fails to provide textures

If gl_hwdec_driver.map_image fails, all textures will be set to 0. This
in turn makes pass_prepare_src_tex() skip generation of the texture
uniforms, which leads to a shader compilation error, as e.g. texture0 is
not defined but expected to exist and accessed.

Set the textures to an invalid non-0 ID instead. OpenGL can deal with
it.

1 files changed, 4 insertions, 1 deletions

diff --git a/video/out/gl_video.c b/video/out/gl_video.c
index bb621df76e..19013c5272 100644
--- a/video/out/gl_video.c
+++ b/video/out/gl_video.c
@@ -667,7 +667,10 @@ static void pass_set_image_textures(struct gl_video *p, struct video_image *vimg
                                / vimg->planes[1].tex_h;
 
     if (p->hwdec_active) {
-        p->hwdec->driver->map_image(p->hwdec, vimg->mpi, imgtex);
+        if (p->hwdec->driver->map_image(p->hwdec, vimg->mpi, imgtex) < 0) {
+            for (int n = 0; n < p->plane_count; n++)
+                imgtex[n] = -1;
+        }
     } else {
         for (int n = 0; n < p->plane_count; n++)
             imgtex[n] = vimg->planes[n].gl_texture;