30 lines
603 B
Plaintext
30 lines
603 B
Plaintext
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#version 400
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in vec2 textureCoords;
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out vec4 out_Colour;
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uniform sampler2D colourTexture;
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const float brightness = 1.2;
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const float contrast = 0.1;
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const float saturation = 1.65;
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void main(void){
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out_Colour = texture(colourTexture, textureCoords);
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// calculate saturation
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vec3 luminanceWeights = vec3(0.299, 0.587, 0.114);
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float luminance = dot(out_Colour.rgb, luminanceWeights);
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out_Colour = mix(vec4(luminance), out_Colour, saturation);
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// calculate contrast
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out_Colour.rgb = (out_Colour.rgb - 0.5) * (1.0 + contrast) + 0.5;
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// calculate brightness
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out_Colour.rgb *= brightness;
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}
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