26 lines
646 B
Python
26 lines
646 B
Python
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$input v_texcoord0, v_color0
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/*
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* Copyright 2011-2018 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 "common.sh"
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SAMPLER2D(s_texColor, 0);
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float median(vec3 _val)
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{
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return max(min(_val.x, _val.y), min(max(_val.x, _val.y), _val.z) );
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}
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void main() {
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vec4 bgColor = vec4(0.0, 0.0, 0.0, 0.0);
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vec4 fgColor = vec4(1.0, 1.0, 1.0, 1.0);
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vec3 sample = texture2DLod(s_texColor, v_texcoord0.xy, u_textureLod).xyz;
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float sigDist = median(sample) - 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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