24 lines
646 B
Factor
24 lines
646 B
Factor
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! Copyright (C) 2010 Erik Charlebois.
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! See http://factorcode.org/license.txt for BSD license.
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USING: ;
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IN: gpu.effects.step
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GLSL-SHADER: step-fragment-shader fragment-shader
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const vec4 luminance = vec4(0.3, 0.59, 0.11, 0.0);
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uniform sampler2D texture;
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uniform sampler2D ramp;
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varying vec2 texcoord;
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void main()
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{
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vec4 col = texture2D(texture, texcoord);
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float l = dot(col, luminance);
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gl_FragColor = texture2D(ramp, vec2(l, 0.0));
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}
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;
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UNIFORM-TUPLE: step-uniforms
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{ "texture" texture-uniform f }
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{ "ramp" texture-uniform f } ;
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GLSL-PROGRAM: step-program window-vertex-shader step-fragment-shader window-vertex-format ;
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