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shaders/ScreenShader.frag

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+#version 330 core
+out vec4 FragColor;
+  
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+uniform sampler2D bloomTexture;
+uniform float bloomStrength = 0.0f;
+uniform float brightness = 0.0f;
+uniform float colorContrast = 0.0f;
+uniform float saturation = 1.0f;
+uniform float exposure = 1.0f;
+
+vec3 ACESFilm(vec3 x)
+{
+    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 clamp((x * (a * x + b)) / (x * (c * x + d) + e), 0.0, 1.0);
+}
+
+void main()
+{ 
+    // Added before tonemapping, while everything is still in HDR
+    vec3 originalcolor = texture(screenTexture, TexCoords).rgb
+        + texture(bloomTexture, TexCoords).rgb * bloomStrength;
+    vec3 finalcolor = ACESFilm(originalcolor * exposure);
+
+    const float gamma = 2.2;
+    finalcolor = pow(finalcolor, vec3(1.0 / gamma));
+
+    finalcolor = mix(finalcolor,vec3(1.0f) - finalcolor,colorContrast);
+
+    float average = (finalcolor[0]+finalcolor[1]+finalcolor[2])/3.0f;
+    
+    finalcolor = mix(vec3(average), finalcolor, saturation);
+
+    FragColor = vec4(finalcolor,1.0f);
+}