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53 lines
936 B
53 lines
936 B
6 months ago
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/**
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* Sepia tone shader
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* based on glfx.js sepia shader
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* https://github.com/evanw/glfx.js
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*/
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const SepiaShader = {
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name: 'SepiaShader',
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uniforms: {
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'tDiffuse': { value: null },
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'amount': { value: 1.0 }
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},
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vertexShader: /* glsl */`
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varying vec2 vUv;
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void main() {
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vUv = uv;
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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}`,
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fragmentShader: /* glsl */`
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uniform float amount;
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uniform sampler2D tDiffuse;
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varying vec2 vUv;
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void main() {
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vec4 color = texture2D( tDiffuse, vUv );
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vec3 c = color.rgb;
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color.r = dot( c, vec3( 1.0 - 0.607 * amount, 0.769 * amount, 0.189 * amount ) );
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color.g = dot( c, vec3( 0.349 * amount, 1.0 - 0.314 * amount, 0.168 * amount ) );
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color.b = dot( c, vec3( 0.272 * amount, 0.534 * amount, 1.0 - 0.869 * amount ) );
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gl_FragColor = vec4( min( vec3( 1.0 ), color.rgb ), color.a );
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}`
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};
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export { SepiaShader };
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