stage: add stage_[sg]et_alpha()

Convenient for whole-stage fades...

1 files changed, 3 insertions, 1 deletions

diff --git a/src/stage.h b/src/stage.h
index ff43847..6d73753 100644
--- a/src/stage.h
+++ b/src/stage.h
@@ -33,7 +33,9 @@ stage_t * stage_new(SDL_Renderer *renderer, float aspect_ratio);
 void stage_clear(stage_t *stage);
 stage_t * stage_free(stage_t *stage);
 void stage_fit(const stage_t *stage, int width, int height, int *res_width, int *res_height);
-void stage_render(stage_t *stage);
+void stage_set_alpha(stage_t *stage, float alpha);
+void stage_get_alpha(stage_t *stage, float *res_alpha);
+void stage_render(const stage_t *stage);
 stage_node_t * stage_node_new(stage_t *stage, int layer, const char *name, void *object, stage_render_func_t render_func, stage_free_func_t free_func);
 
 void stage_get_output_size(stage_t *stage, int *res_width, int *res_height);