assets.shaders.location_1.glsl Maven / Gradle / Ivy
#ifdef GLES
precision mediump float;
#endif
uniform mat4 u_mvp;
uniform float u_phase;
uniform float u_scale;
attribute vec2 a_pos;
varying vec2 v_tex;
void main() {
gl_Position = u_mvp * vec4(a_pos * u_scale * u_phase, 0.0, 1.0);
v_tex = a_pos;
}
$$
#ifdef GLES
precision mediump float;
#endif
varying vec2 v_tex;
uniform float u_scale;
uniform float u_phase;
uniform vec2 u_dir;
uniform int u_mode;
uniform vec4 u_color;
void main() {
float len = 1.0 - length(v_tex);
if (u_mode == -1) {
gl_FragColor = u_color * len;
} else {
// outer ring
float a = smoothstep(0.0, 2.0 / u_scale, len);
// inner ring
float b = 0.5 * smoothstep(4.0 / u_scale, 5.0 / u_scale, len);
// center point
float c = 0.5 * (1.0 - smoothstep(14.0 / u_scale, 16.0 / u_scale, 1.0 - len));
vec2 dir = normalize(v_tex);
float d = 1.0 - dot(dir, u_dir);
// 0.5 width of viewshed
d = clamp(step(0.5, d), 0.4, 0.7);
// - subtract inner from outer to create the outline
// - multiply by viewshed
// - add center point
a = d * (a - (b + c)) + c;
gl_FragColor = u_color * a;
}
}