fixes, configurable framebuffers quality

shaders/tonemapping.glsl

@@ -0,0 +1,42 @@
+vec3 reinhard(vec3 x)
+{
+	return x / (x + vec3(1.0));
+}
+
+// https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
+vec3 ACESFilm(vec3 x)
+{
+    float a = 2.51f;
+    float b = 0.03f;
+    float c = 2.43f;
+    float d = 0.59f;
+    float e = 0.14f;
+    return (x*(a*x+b))/(x*(c*x+d)+e);
+}
+
+// https://www.slideshare.net/ozlael/hable-john-uncharted2-hdr-lighting
+vec3 filmicF(vec3 x)
+{
+	float A = 0.22f;
+	float B = 0.30f;
+	float C = 0.10f;
+	float D = 0.20f;
+	float E = 0.01f;
+	float F = 0.30f;
+	return ((x*(A*x+C*B)+D*E)/(x*(A*x+B)+D*F)) - E/F;
+}
+
+vec3 filmic(vec3 x)
+{
+	return filmicF(x) / filmicF(vec3(11.2f));
+}
+
+vec3 tonemap(vec3 x)
+{
+	return ACESFilm(x);
+}
+
+vec4 tonemap(vec4 x)
+{
+	return vec4(tonemap(x.rgb), x.a);
+}