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40 lines
862 B
GLSL
40 lines
862 B
GLSL
// SPDX-License-Identifier: MIT
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//
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// EmulationStation Desktop Edition
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// desaturate.glsl
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//
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// Desaturates textures.
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// The uniform variable 'saturation' sets the saturation intensity.
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// Setting this to the value 0 results in complete desaturation (grayscale).
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//
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#if defined(VERTEX)
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// Vertex section of code:
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uniform mat4 MVPMatrix;
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varying vec2 vTexCoord;
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void main(void)
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{
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vTexCoord = gl_MultiTexCoord0.xy;
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gl_Position = MVPMatrix * gl_Vertex;
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}
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#elif defined(FRAGMENT)
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// Fragment section of code:
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uniform float saturation = 1.0;
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uniform sampler2D myTexture;
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varying vec2 vTexCoord;
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void main()
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{
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vec4 color = texture2D(myTexture, vTexCoord);
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vec3 grayscale = vec3(dot(color.rgb, vec3(0.3, 0.59, 0.11)));
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vec3 blendedColor = mix(grayscale, color.rgb, saturation);
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gl_FragColor = vec4(blendedColor, color.a);
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}
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#endif
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