X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=gamma_expansion_effect.h;h=9565a3b0e4d5d0654bb1d6f197067e4a6d88af3e;hp=f3e20c59ed95eba6030750cb04bf1846b37898fe;hb=eff011224abc5dc81f801f3ea44572287a55bcac;hpb=3915264bd8fde4d550e47c10a67a2741625b9033

diff --git a/gamma_expansion_effect.h b/gamma_expansion_effect.h
index f3e20c5..9565a3b 100644
--- a/gamma_expansion_effect.h
+++ b/gamma_expansion_effect.h
@@ -1,22 +1,46 @@
-#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, 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 {
-public:
+private:
+	// Should not be instantiated by end users.
 	GammaExpansionEffect();
-	std::string output_fragment_shader();
+	friend class EffectChain;
 
-	virtual bool needs_linear_light() const { return false; }
-	virtual bool needs_srgb_primaries() const { return false; }
+public:
+	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;
+
+	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.
+	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)