813ddb024a
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
28 lines
668 B
GLSL
28 lines
668 B
GLSL
in vec2 v_extrude;
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layout (std140) uniform HeatmapEvaluatedPropsUBO {
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highp float u_weight;
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highp float u_radius;
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highp float u_intensity;
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lowp float pad0_;
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};
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#pragma mapbox: define highp float weight
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// Gaussian kernel coefficient: 1 / sqrt(2 * PI)
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#define GAUSS_COEF 0.3989422804014327
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void main() {
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#pragma mapbox: initialize highp float weight
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// Kernel density estimation with a Gaussian kernel of size 5x5
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float d = -0.5 * 3.0 * 3.0 * dot(v_extrude, v_extrude);
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float val = weight * u_intensity * GAUSS_COEF * exp(d);
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fragColor = vec4(val, 1.0, 1.0, 1.0);
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#ifdef OVERDRAW_INSPECTOR
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fragColor = vec4(1.0);
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#endif
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}
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