Store all twiddle factors as fp16.

[movit] / gamma_compression_effect.h

diff --git a/gamma_compression_effect.h b/gamma_compression_effect.h
index 03cbb24133417da2a3da336d60b39edc04b4e781..83208cf0dcc44d77412c5a595f6cab9906b75e0a 100644 (file)
--- a/gamma_compression_effect.h
+++ b/gamma_compression_effect.h
@@ -1,28 +1,43 @@
-#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 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 <GL/glew.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();
+       friend class EffectChain;
+
+public:
        virtual std::string effect_type_id() const { return "GammaCompressionEffect"; }
        std::string output_fragment_shader();
+       virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
 
        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)
+}  // namespace movit
+
+#endif // !defined(_MOVIT_GAMMA_COMPRESSION_EFFECT_H)