#define _MOVIT_LUMA_MIX_EFFECT_H 1
// Fade between two images based on a third monochrome one; lighter pixels
-// will be faded before darker pixels. This allows a wide range of different
-// video wipes implemented using a single effect.
+// will be faded before darker pixels (unless the inverse flag is set,
+// in which case darker pixels will be faded before lighter pixels).
+// This allows a wide range of different video wipes implemented using
+// a single effect.
//
// Note that despite the name, the third input's _red_ channel is what's used
// for transitions; there is no luma calculation done. If you need that,
class LumaMixEffect : public Effect {
public:
LumaMixEffect();
- virtual std::string effect_type_id() const { return "LumaMixEffect"; }
- std::string output_fragment_shader();
- virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+ std::string effect_type_id() const override { return "LumaMixEffect"; }
+ std::string output_fragment_shader() override;
+ void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;
- virtual bool needs_srgb_primaries() const { return false; }
- virtual unsigned num_inputs() const { return 3; }
- virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+ bool needs_srgb_primaries() const override { return false; }
+ unsigned num_inputs() const override { return 3; }
+ bool strong_one_to_one_sampling() const override { return true; }
+ AlphaHandling alpha_handling() const override { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
private:
float transition_width, progress;
+ int inverse; // 0 or 1.
+ bool uniform_inverse;
+ float uniform_progress_mul_w_plus_one;
};
} // namespace movit