X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=gamma_compression_effect.h;h=9094f1964acfd9e10e7fb9844b07965b5564c1be;hp=70163419388281da8b6cb54d3bd2c117dd250cd6;hb=9527105a4958fa20f8d87d719a26b00cb000c0e8;hpb=2ced784c6599cb0b21427481ee17f4c8f6afdada

diff --git a/gamma_compression_effect.h b/gamma_compression_effect.h
index 7016341..9094f19 100644
--- a/gamma_compression_effect.h
+++ b/gamma_compression_effect.h
@@ -1,21 +1,45 @@
-#ifndef _GAMMA_COMPRESSION_EFFECT_H 
-#define _GAMMA_COMPRESSION_EFFECT_H 1
+#ifndef _MOVIT_GAMMA_COMPRESSION_EFFECT_H 
+#define _MOVIT_GAMMA_COMPRESSION_EFFECT_H 1
+
+// An effect to convert linear light to the given gamma curve,
+// typically inserted by the framework automatically at the end
+// 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 COMPRESSION_CURVE_SIZE 4096
+namespace movit {
 
 class GammaCompressionEffect : public Effect {
-public:
+private:
+	// Should not be instantiated by end users.
 	GammaCompressionEffect();
-	std::string output_fragment_shader();
+	friend class EffectChain;
 
-	virtual bool needs_srgb_primaries() { return false; }
+public:
+	std::string effect_type_id() const override { return "GammaCompressionEffect"; }
+	std::string output_fragment_shader() override;
+	void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;
+
+	bool needs_srgb_primaries() const override { return false; }
+	bool strong_one_to_one_sampling() const override { return true; }
+
+	// Actually needs postmultiplied input as well as outputting it.
+	// EffectChain will take care of that.
+	AlphaHandling alpha_handling() const override { return OUTPUT_POSTMULTIPLIED_ALPHA; }
 
 private:
 	GammaCurve destination_curve;
-	float compression_curve[COMPRESSION_CURVE_SIZE];
+	float uniform_linear_scale, uniform_c[5], uniform_beta;
 };
 
-#endif // !defined(_GAMMA_COMPRESSION_EFFECT_H)
+}  // namespace movit
+
+#endif // !defined(_MOVIT_GAMMA_COMPRESSION_EFFECT_H)