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