#version 100 #extension GL_OES_standard_derivatives : enable // see for reference: https://stackoverflow.com/questions/7361582/opengl-debugging-single-pass-wireframe-rendering precision highp float; uniform vec4 uniform_color; varying vec3 barycentric; void main() { float min_dist = min(min(barycentric.x, barycentric.y), barycentric.z); if (min_dist > 0.5 * fwidth(min_dist)) discard; gl_FragColor = uniform_color; }