-#ifndef _GAMMA_EXPANSION_EFFECT_H
-#define _GAMMA_EXPANSION_EFFECT_H 1
+#ifndef _MOVIT_GAMMA_EXPANSION_EFFECT_H
+#define _MOVIT_GAMMA_EXPANSION_EFFECT_H 1
// An effect to convert the given gamma curve into linear light,
// typically inserted by the framework automatically at the beginning
// of the processing chain.
//
-// Currently supports sRGB and Rec. 601/709.
+// Currently supports sRGB, Rec. 601/709 and Rec. 2020 (10- and 12-bit).
+// Note that Movit's internal formats generally do not have enough accuracy
+// for 12-bit input or output.
+
+#include <epoxy/gl.h>
+#include <string>
#include "effect.h"
-#include "effect_chain.h"
+#include "image_format.h"
-#define EXPANSION_CURVE_SIZE 256
+namespace movit {
class GammaExpansionEffect : public Effect {
private:
friend class EffectChain;
public:
- virtual std::string effect_type_id() const { return "GammaExpansionEffect"; }
- std::string output_fragment_shader();
+ std::string effect_type_id() const override { return "GammaExpansionEffect"; }
+ 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_linear_light() const { return false; }
- virtual bool needs_srgb_primaries() const { return false; }
+ bool needs_linear_light() const override { return false; }
+ bool needs_srgb_primaries() const override { return false; }
+ bool strong_one_to_one_sampling() const override { return true; }
// Actually processes its input in a nonlinear fashion,
// but does not touch alpha, and we are a special case anyway.
- virtual AlphaHandling alpha_handling() const { return DONT_CARE_ALPHA_TYPE; }
+ AlphaHandling alpha_handling() const override { return DONT_CARE_ALPHA_TYPE; }
private:
GammaCurve source_curve;
- float expansion_curve[EXPANSION_CURVE_SIZE];
+ float uniform_linear_scale, uniform_c[5], uniform_beta;
};
-#endif // !defined(_GAMMA_EXPANSION_EFFECT_H)
+} // namespace movit
+
+#endif // !defined(_MOVIT_GAMMA_EXPANSION_EFFECT_H)