[orx-fx] convert to MPP

orx-fx/src/shaders/glsl/tonemap/uncharted2-tonemap.frag

@@ -0,0 +1,27 @@
+// ad[a|o]pted from http://filmicworlds.com/blog/filmic-tonemapping-operators/
+float A = 0.15;
+float B = 0.50;
+float C = 0.10;
+float D = 0.20;
+float E = 0.02;
+float F = 0.30;
+float W = 11.2;
+
+uniform sampler2D tex0;
+uniform float exposureBias;
+in vec2 v_texCoord0;
+out vec4 o_output;
+
+vec3 Uncharted2Tonemap(vec3 x) {
+    return ((x*(A*x+C*B)+D*E)/(x*(A*x+B)+D*F))-E/F;
+}
+
+void main() {
+    vec3 texColor = texture(tex0,v_texCoord0).rgb;
+    vec3 curr = Uncharted2Tonemap(exposureBias*texColor);
+    vec3 whiteScale = 1.0f/Uncharted2Tonemap(vec3(W));
+    vec3 color = curr*whiteScale;
+
+    vec3 retColor = pow(color, vec3(1/2.2));
+    o_output = vec4(retColor, 1);
+}