17 lines
877 B
WebGPU Shading Language
17 lines
877 B
WebGPU Shading Language
/*
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contributors: Patricio Gonzalez Vivo
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description: returns a 4x4 rotation matrix
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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fn rotate4d(a: vec3f, r: f32) -> mat4x4<f32> {
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let s = sin(r);
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let c = cos(r);
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let oc = 1.0 - c;
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return mat4x4<f32>( oc * a.x * a.x + c, oc * a.x * a.y - a.z * s, oc * a.z * a.x + a.y * s, 0.0,
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oc * a.x * a.y + a.z * s, oc * a.y * a.y + c, oc * a.y * a.z - a.x * s, 0.0,
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oc * a.z * a.x - a.y * s, oc * a.y * a.z + a.x * s, oc * a.z * a.z + c, 0.0,
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0.0, 0.0, 0.0, 1.0);
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}
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