+ // Whether this effect wants to output to a different size than
+ // its input(s). If you set this to true, the output will be
+ // bounced to a texture (similarly to if the next effect set
+ // needs_texture_bounce()).
+ virtual bool changes_output_size() const { return false; }
+
+ // If changes_output_size() is true, you must implement this to tell
+ // the framework what output size you want.
+ //
+ // Note that it is explicitly allowed to change width and height
+ // from frame to frame; EffectChain will reallocate textures as needed.
+ virtual void get_output_size(unsigned *width, unsigned *height) const {
+ assert(false);
+ }
+
+ // How many inputs this effect will take (a fixed number).
+ // If you have only one input, it will be called INPUT() in GLSL;
+ // if you have several, they will be INPUT1(), INPUT2(), and so on.
+ virtual unsigned num_inputs() const { return 1; }
+