29 lines
717 B
Python
29 lines
717 B
Python
$input v_texcoord0, v_color0
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/*
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* Copyright 2011-2017 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include <bgfx_shader.sh>
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SAMPLER2D(s_texColor, 0);
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uniform vec4 u_params;
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#define u_textureLod u_params.x
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float median(float r, float g, float b)
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{
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return max(min(r, g), min(max(r, g), b) );
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}
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void main() {
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vec4 bgColor = vec4(1.0, 1.0, 1.0, 1.0);
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vec4 fgColor = vec4(0.0, 0.0, 0.0, 1.0);
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vec3 sample = texture2DLod(s_texColor, v_texcoord0.xy, u_textureLod).rgb;
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float sigDist = median(sample.r, sample.g, sample.b) - 0.5;
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float opacity = clamp(sigDist/fwidth(sigDist) + 0.5, 0.0, 1.0);
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gl_FragColor = mix(bgColor, fgColor, opacity);
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}
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