39 lines
1.6 KiB
Text
39 lines
1.6 KiB
Text
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out vec4 FragColor;
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in vec3 vertex;
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in vec2 tex_coord;
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uniform float time;
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#define GLM_PI 3.14159265358979323846264338327950288
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#define GLM_SQRT2 1.41421356237309504880168872420969808
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#define vis_div 24.0
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float v2rand(vec2 uv) {
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return fract(sin(dot(uv, vec2(12.9898,78.233))) * 43758.5453123);
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}
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float avg(vec4 v) {
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return ((v.r + v.g + v.b) / 3.0) * v.a;
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}
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float gauss(float v, float b, float c) {
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return (1.0 / (c * sqrt(2.0 * GLM_PI))) * exp(-(pow(v - b, 2.0) / (2.0 * pow(c, 2.0))));
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}
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float dgauss(float v, float b, float c) {
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return b + v * c;
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}
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float inside(vec2 vec, vec2 offs, float a, float b, float scale, float x1, float x2, float y1, float y2) {
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vec2 cscaled = (mod(vec + offs + 1.0, 1.0)) * scale;
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return (x2 < x1 ? (cscaled.x >= x1 || cscaled.x <= x2) : (cscaled.x >= x1 && cscaled.x <= x2)) || (y2 < y1 ? (cscaled.y >= y1 || cscaled.y <= y2) : (cscaled.y >= y1 && cscaled.y <= y2)) || (abs(cscaled.y - (cscaled.x - (x2 < x1 ? (x1 - x2) : (x2 - x1)) * GLM_SQRT2 * (x2 < x1 ? 0.0 : (x1 < scale / 2.0 ? x1 : (x2 - scale))))) < GLM_SQRT2) ? b : a;
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}
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void main() {
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vec2 shift = vec2(v2rand(tex_coord + fract(time)) * 2.0 - 1.0, v2rand(tex_coord + 0.5 + fract(time)) * 2.0 - 1.0);
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shift = vec2(dgauss(shift.x, 0.0, 1.0), dgauss(shift.y, 0.0, 1.0)) * 0.015;
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vec3 cl = vec3(inside(tex_coord / vis_div, shift, 0.0, 1.0, 64.0, 1.0, 3.0, 1.0, 3.0), inside(tex_coord / vis_div, shift, 0.0, 1.0, 64.0, 63.0, 1.0, 63.0, 1.0), inside(tex_coord / vis_div, shift, 0.0, 1.0, 64.0, 61.0, 63.0, 61.0, 63.0));
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FragColor = vec4(mix(vec3(0.0, 0.0, clamp(0.1 + 0.2 * (vertex.y + 64.0) / 128.0, 0.0, 1.0)), cl, clamp(cl.x + cl.y + cl.z, 0.0, 1.0)), 1.0);
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}
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