vo_gpu: handle texture initialization errors gracefully

Tested by making the ra_tex_resize function always fail (apart from the
initial FBO check). This required a few changes:

1. reset shaders on failed dispatch
2. reset cleanup binds on failed dispatch
3. fall back to initializing the struct image to 1x1 on failure
4. handle output_fbo_valid gracefully

1 files changed, 3 insertions, 0 deletions

diff --git a/video/out/gpu/shader_cache.h b/video/out/gpu/shader_cache.h
index 82a078079b..377293391c 100644
--- a/video/out/gpu/shader_cache.h
+++ b/video/out/gpu/shader_cache.h
@@ -53,4 +53,7 @@ struct mp_pass_perf gl_sc_dispatch_draw(struct gl_shader_cache *sc,
                                         void *ptr, size_t num);
 struct mp_pass_perf gl_sc_dispatch_compute(struct gl_shader_cache *sc,
                                            int w, int h, int d);
+// The application can call this on errors, to reset the current shader. This
+// is normally done implicitly by gl_sc_dispatch_*
+void gl_sc_reset(struct gl_shader_cache *sc);
 void gl_sc_set_cache_dir(struct gl_shader_cache *sc, const char *dir);