In ResampleEffect, precompute the Lanczos function into a table.

[movit] / gamma_expansion_effect.h

diff --git a/gamma_expansion_effect.h b/gamma_expansion_effect.h
index 07d94bea60a6f7784b94b5328ac86cb063d59a9f..20a5a76fba04315d74f9aa09502eaac3e196e658 100644 (file)
--- a/gamma_expansion_effect.h
+++ b/gamma_expansion_effect.h
@@ -5,14 +5,17 @@
 // 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 "image_format.h"
 
-#define EXPANSION_CURVE_SIZE 256
+namespace movit {
 
 class GammaExpansionEffect : public Effect {
 private:
@@ -23,9 +26,11 @@ private:
 public:
        virtual std::string effect_type_id() const { return "GammaExpansionEffect"; }
        std::string output_fragment_shader();
+       virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
 
        virtual bool needs_linear_light() const { return false; }
        virtual bool needs_srgb_primaries() const { return false; }
+       virtual bool one_to_one_sampling() const { return true; }
 
        // Actually processes its input in a nonlinear fashion,
        // but does not touch alpha, and we are a special case anyway.
@@ -33,7 +38,9 @@ public:
 
 private:
        GammaCurve source_curve;
-       float expansion_curve[EXPANSION_CURVE_SIZE];
+       float uniform_linear_scale, uniform_c0, uniform_c1, uniform_c2, uniform_c3, uniform_c4, uniform_beta;
 };
 
+}  // namespace movit
+
 #endif // !defined(_MOVIT_GAMMA_EXPANSION_EFFECT_H)