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31 lines
740 B
GLSL
31 lines
740 B
GLSL
/**
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* Gaussian Function.
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* https://en.wikipedia.org/wiki/Gaussian_function
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*
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* @author Nikita Agafonov
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* @copyright (c) 2020-2022 Open Science Tools Ltd. (https://opensciencetools.org)
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* @license Distributed under the terms of the MIT License
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* @description Creates a 2d Gaussian image as if 1d Gaussian graph was rotated arount Y axis and observed from above.
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* @usedby GratingStim.js
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*/
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#version 300 es
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precision mediump float;
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in vec2 vUvs;
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out vec4 shaderOut;
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uniform float uA;
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uniform float uB;
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uniform float uC;
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#define M_PI 3.14159265358979
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void main() {
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vec2 uv = vUvs;
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float c2 = uC * uC;
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float x = length(uv - .5);
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float g = uA * exp(-pow(x - uB, 2.) / c2 * .5);
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shaderOut = vec4(vec3(g), 1.);
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}
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