add tonemapping shaders

shader/ToneMap/ACES.glsl

@@ -0,0 +1,11 @@
+// ACES tone map
+// see: https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
+vec3 ToneMapping(vec3 color)
+{
+    const float A = 2.51;
+    const float B = 0.03;
+    const float C = 2.43;
+    const float D = 0.59;
+    const float E = 0.14;
+    return linearTosRGB(clamp((color * (A * color + B)) / (color * (C * color + D) + E), 0.0, 1.0));
+}