X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=gamma_compression_effect.h;h=46ac80e7d6b12e6b2b217dcb942d125fbe9788f3;hp=3f32f5ccb8f7fa02a9d9a4d409369980b6dcec1b;hb=7af4d1b54ba141fdb74cd13ddc6110708855d157;hpb=17c083aad45a10df14c38cfe879a87220dfd4fb9

diff --git a/gamma_compression_effect.h b/gamma_compression_effect.h
index 3f32f5c..46ac80e 100644
--- a/gamma_compression_effect.h
+++ b/gamma_compression_effect.h
@@ -1,18 +1,36 @@
 #ifndef _GAMMA_COMPRESSION_EFFECT_H 
 #define _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 and Rec. 601/709.
+
 #include "effect.h"
 #include "effect_chain.h"
 
+#define COMPRESSION_CURVE_SIZE 4096
+
 class GammaCompressionEffect : public Effect {
-public:
+private:
+	// Should not be instantiated by end users.
 	GammaCompressionEffect();
+	friend class EffectChain;
+
+public:
+	virtual std::string effect_type_id() const { return "GammaCompressionEffect"; }
 	std::string output_fragment_shader();
 
-	virtual bool needs_srgb_primaries() { return false; }
+	virtual bool needs_srgb_primaries() const { return false; }
+
+	// Actually needs postmultiplied input as well as outputting it.
+	// EffectChain will take care of that.
+	virtual AlphaHandling alpha_handling() const { return OUTPUT_POSTMULTIPLIED_ALPHA; }
 
 private:
 	GammaCurve destination_curve;
+	float compression_curve[COMPRESSION_CURVE_SIZE];
 };
 
 #endif // !defined(_GAMMA_COMPRESSION_EFFECT_H)