LYGIA Shader Library

Use:

scale(<vec2> st, <vec2|float> scale_factor [, <vec2> center])

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#ifndef FNC_SCALE
#define FNC_SCALE
vec2 scale(in float st, in float s, in vec2 center) { return (st - center) * s + center; }
vec2 scale(in float st, in float s) {
#ifdef CENTER_2D
    return scale(st,  s, CENTER_2D);
#else
    return scale(st,  s, vec2(0.5));
#endif
}

vec2 scale(in vec2 st, in vec2 s, in vec2 center) { return (st - center) * s + center; }
vec2 scale(in vec2 st, in float s, in vec2 center) { return scale(st, vec2(s), center); }
vec2 scale(in vec2 st, in vec2 s) {
#ifdef CENTER_2D
    return (st - CENTER_2D) * s + CENTER_2D;
#else
    return (st - 0.5) * s + 0.5;
#endif
}

vec2 scale(in vec2 st, in float s) {
#ifdef CENTER_2D
    return (st - CENTER_2D) * s + CENTER_2D;
#else
    return (st - 0.5) * s + 0.5;
#endif
}

vec3 scale(in vec3 st, in vec3 s, in vec3 center) { return (st - center) * s + center; }
vec3 scale(in vec3 st, in float s, in vec3 center) { return (st - center) * s + center; }
vec3 scale(in vec3 st, in vec3 s) {
#ifdef CENTER_3D
    return (st - CENTER_3D) * s + CENTER_3D;
#else
    return (st - 0.5) * s + 0.5;
#endif
}

vec3 scale(in vec3 st, in float s) {
#ifdef CENTER_3D
    return (st - CENTER_3D) * s + CENTER_3D;
#else
    return (st - 0.5) * s + 0.5;
#endif
}

// For tiles
vec4 scale(in vec4 st, float s) { return vec4(scale(st.xy, s), st.zw); }
vec4 scale(in vec4 st, vec2 s) { return vec4(scale(st.xy, s), st.zw); }
#endif

Use:

scale(<float2> st, <float2|float> scale_factor [, <float2> center])

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#ifndef FNC_SCALE
#define FNC_SCALE
float scale(in float st, in float s, in float center) {
    return (st - center) * s + center;
}

float scale(in float st, in float s) {
    #ifdef CENTER_2D
    return scale(st,  s, CENTER);
    #else
    return scale(st,  s, .5);
    #endif
}


float2 scale(in float2 st, in float2 s, in float2 center) {
    return (st - center) * s + center;
}

float2 scale(in float2 st, in float value, in float2 center) {
    return scale(st, float2(value, value), center);
}

float2 scale(in float2 st, in float2 s) {
    #ifdef CENTER_2D
    return scale(st,  s, CENTER_2D);
    #else
    return scale(st,  s, float2(.5, .5));
    #endif
}

float2 scale(in float2 st, in float value) {
    return scale(st, float2(value, value));
}

float3 scale(in float3 st, in float3 s, in float3 center) {
    return (st - center) * s + center;
}

float3 scale(in float3 st, in float value, in float3 center) {
    return scale(st, float3(value, value, value), center);
}

float3 scale(in float3 st, in float3 s) {
    #ifdef CENTER_3D
    return scale(st,  s, CENTER_3D);
    #else
    return scale(st,  s, float3(.5, .5, .5));
    #endif
}

float3 scale(in float3 st, in float value) {
    return scale(st, float3(value, value, value));
}
#endif

Check it on Github

fn scale(st: vec2<f32>, s: vec2<f32>) -> vec2<f32> {
    return (st - 0.5) * s + 0.5;
}