63 lines
1.8 KiB
GLSL
63 lines
1.8 KiB
GLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: scale a 2D space variable
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use: scale(<vec2> st, <vec2|float> scale_factor [, <vec2> center])
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options:
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- CENTER_2D
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- CENTER_3D
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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_SCALE
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#define FNC_SCALE
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vec2 scale(in float st, in float s, in vec2 center) { return (st - center) * s + center; }
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vec2 scale(in float st, in float s) {
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#ifdef CENTER_2D
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return scale(st, s, CENTER_2D);
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#else
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return scale(st, s, vec2(0.5));
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#endif
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}
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vec2 scale(in vec2 st, in vec2 s, in vec2 center) { return (st - center) * s + center; }
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vec2 scale(in vec2 st, in float s, in vec2 center) { return scale(st, vec2(s), center); }
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vec2 scale(in vec2 st, in vec2 s) {
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#ifdef CENTER_2D
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return (st - CENTER_2D) * s + CENTER_2D;
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#else
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return (st - 0.5) * s + 0.5;
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#endif
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}
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vec2 scale(in vec2 st, in float s) {
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#ifdef CENTER_2D
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return (st - CENTER_2D) * s + CENTER_2D;
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#else
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return (st - 0.5) * s + 0.5;
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#endif
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}
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vec3 scale(in vec3 st, in vec3 s, in vec3 center) { return (st - center) * s + center; }
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vec3 scale(in vec3 st, in float s, in vec3 center) { return (st - center) * s + center; }
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vec3 scale(in vec3 st, in vec3 s) {
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#ifdef CENTER_3D
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return (st - CENTER_3D) * s + CENTER_3D;
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#else
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return (st - 0.5) * s + 0.5;
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#endif
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}
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vec3 scale(in vec3 st, in float s) {
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#ifdef CENTER_3D
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return (st - CENTER_3D) * s + CENTER_3D;
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#else
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return (st - 0.5) * s + 0.5;
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#endif
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}
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// For tiles
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vec4 scale(in vec4 st, float s) { return vec4(scale(st.xy, s), st.zw); }
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vec4 scale(in vec4 st, vec2 s) { return vec4(scale(st.xy, s), st.zw); }
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#endif
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