65 lines
1.8 KiB
HLSL
65 lines
1.8 KiB
HLSL
#include "../math/rotate2d.hlsl"
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#include "../math/rotate4d.hlsl"
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/*
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contributors: Patricio Gonzalez Vivo
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description: rotate a 2D space by a radian radians
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use: rotate(<float3|float2> st, float radians [, float2 center])
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options:
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- CENTER_2D
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- CENTER_3D
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- CENTER_4D
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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_ROTATE
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#define FNC_ROTATE
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float2 rotate(in float2 st, in float radians, in float2 center) {
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return mul(rotate2d(radians), (st - center)) + center;
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}
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float2 rotate(in float2 st, in float radians) {
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#ifdef CENTER_2D
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return rotate(st, radians, CENTER_2D);
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#else
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return rotate(st, radians, float2(0.5, 0.5));
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#endif
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}
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float2 rotate(float2 st, float2 x_axis) {
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#ifdef CENTER_2D
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st -= CENTER_2D;
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#endif
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float2 rta = float2( dot(st, float2(-x_axis.y, x_axis.x)), dot(st, x_axis) );
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#ifdef CENTER_2D
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rta += CENTER_2D;
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#endif
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return rta;
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}
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float3 rotate(in float3 xyz, in float radians, in float3 axis, in float3 center) {
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return mul(rotate4d(axis, radians), float4(xyz - center, 1.)).xyz + center;
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}
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float3 rotate(in float3 xyz, in float radians, in float3 axis) {
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#ifdef CENTER_3D
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return rotate(xyz, radians, axis, CENTER_3D);
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#else
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return rotate(xyz, radians, axis, float3(0.0, 0.0, 0.0));
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#endif
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}
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float4 rotate(in float4 xyzw, in float radians, in float3 axis, in float4 center) {
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return mul(rotate4d(axis, radians), (xyzw - center)) + center;
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}
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float4 rotate(in float4 xyzw, in float radians, in float3 axis) {
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#ifdef CENTER_4D
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return rotate(xyzw, radians, axis, CENTER_4D);
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#else
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return rotate(xyzw, radians, axis, float4(0.0, 0.0, 0.0, 0.0));
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#endif
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}
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#endif
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