50 lines
No EOL
1.5 KiB
HLSL
50 lines
No EOL
1.5 KiB
HLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: create a look at matrix
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use:
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- <float3x3> lookAt(<float3> forward, <float3> up)
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- <float3x3> lookAt(<float3> target, <float3> eye, <float3> up)
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- <float3x3> lookAt(<float3> target, <float3> eye, <float> roll)
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- <float3x3> lookAt(<float3> forward)
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options:
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- LOOK_AT_LEFT_HANDED: assume a left-handed coordinate system
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- LOOK_AT_RIGHT_HANDED: assume a right-handed coordinate system
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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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#ifndef FNC_LOOKAT
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#define FNC_LOOKAT
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float3x3 lookAt(float3 forward, float3 up) {
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float3 zaxis = normalize(forward);
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#if defined (LOOK_AT_RIGHT_HANDED)
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float3 xaxis = normalize(cross(zaxis, up));
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float3 yaxis = cross(xaxis, zaxis);
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#else
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float3 xaxis = normalize(cross(up, zaxis));
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float3 yaxis = cross(zaxis, xaxis);
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#endif
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float3x3 m;
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m._m00_m10_m20 = xaxis;
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m._m01_m11_m21 = yaxis;
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m._m02_m12_m22 = zaxis;
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return m;
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}
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float3x3 lookAt(float3 eye, float3 target, float3 up) {
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float3 forward = normalize(target - eye);
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return lookAt(forward, up);
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}
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float3x3 lookAt(float3 eye, float3 target, float roll) {
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float3 up = float3(sin(roll), cos(roll), 0.0);
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return lookAt(eye, target, up);
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}
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float3x3 lookAt(float3 forward) {
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return lookAt(forward, float3(0.0, 1.0, 0.0));
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}
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#endif |