Make Input an abstract base class, and move the current functionality into FlatInput...

[movit] / gamma_expansion_effect.cpp

diff --git a/gamma_expansion_effect.cpp b/gamma_expansion_effect.cpp
index 1748ae93dcee81c7268f803c82a8dffb13c8495a..d4e532f8b816f1cf594a0f82ba199f5133f944cb 100644 (file)
--- a/gamma_expansion_effect.cpp
+++ b/gamma_expansion_effect.cpp
@@ -1,3 +1,6 @@
+#include <math.h>
+#include <assert.h>
+

 #include "gamma_expansion_effect.h"
 #include "util.h"
 
 #include "gamma_expansion_effect.h"
 #include "util.h"
 


@@ -5,9 +8,37 @@ GammaExpansionEffect::GammaExpansionEffect()
        : source_curve(GAMMA_LINEAR)
 {
        register_int("source_curve", (int *)&source_curve);
        : source_curve(GAMMA_LINEAR)
 {
        register_int("source_curve", (int *)&source_curve);

+       register_1d_texture("expansion_curve_tex", expansion_curve, EXPANSION_CURVE_SIZE);

 }
 
 }
 

-std::string GammaExpansionEffect::output_glsl()
+std::string GammaExpansionEffect::output_fragment_shader()

 {
 {

-       return read_file("todo.glsl");
+       if (source_curve == GAMMA_LINEAR) {
+               return read_file("identity.frag");
+       }
+       if (source_curve == GAMMA_sRGB) {
+               for (unsigned i = 0; i < EXPANSION_CURVE_SIZE; ++i) {
+                       float x = i / (float)(EXPANSION_CURVE_SIZE - 1);
+                       if (x < 0.04045f) {
+                               expansion_curve[i] = (1.0/12.92f) * x;
+                       } else {
+                               expansion_curve[i] = pow((x + 0.055) * (1.0/1.055f), 2.4);
+                       }
+               }
+               invalidate_1d_texture("expansion_curve_tex");
+               return read_file("gamma_expansion_effect.frag");
+       }
+       if (source_curve == GAMMA_REC_709) {  // And Rec. 601.
+               for (unsigned i = 0; i < EXPANSION_CURVE_SIZE; ++i) {
+                       float x = i / (float)(EXPANSION_CURVE_SIZE - 1);
+                       if (x < 0.081f) {
+                               expansion_curve[i] = (1.0/4.5f) * x;
+                       } else {
+                               expansion_curve[i] = pow((x + 0.099) * (1.0/1.099f), 1.0f/0.45f);
+                       }
+               }
+               invalidate_1d_texture("expansion_curve_tex");
+               return read_file("gamma_expansion_effect.frag");
+       }
+       assert(false);

 }
 }