@spearwolf/twopoint5d/lib/sprites/ShaderTool.js

a library to create 2.5d realtime graphics and pixelart with three.js

const isNumber = (x) => typeof x === 'number';
function add(a, b) {
    if (isNumber(a) && isNumber(b)) {
        return a + b;
    }
    else if (isNumber(a)) {
        switch (a) {
            case 0:
                return b;
            default:
                return `${a} + ${b}`;
        }
    }
    else if (isNumber(b)) {
        switch (b) {
            case 0:
                return a;
            default:
                return `${a} + ${b}`;
        }
    }
    else {
        return `${a} + ${b}`;
    }
}
function sub(a, b) {
    if (isNumber(a) && isNumber(b)) {
        return a - b;
    }
    else if (isNumber(a)) {
        switch (a) {
            case 0:
                return `-${b}`;
            default:
                return `${a} - ${b}`;
        }
    }
    else if (isNumber(b)) {
        switch (b) {
            case 0:
                return a;
            default:
                return `${a} - ${b}`;
        }
    }
    else {
        return `${a} - ${b}`;
    }
}
function mul(a, b) {
    if (isNumber(b) && isNumber(a)) {
        return a * b;
    }
    else if (isNumber(a)) {
        switch (a) {
            case 0:
                return 0;
            case 1:
                return b;
            default:
                return `${a} * ${b}`;
        }
    }
    else if (isNumber(b)) {
        switch (b) {
            case 0:
                return 0;
            case 1:
                return a;
            default:
                return `${a} * ${b}`;
        }
    }
    else {
        return `${a} * ${b}`;
    }
}
function asFloat(number) {
    const str = `${number}`.trim();
    if (str.match(/^[0-9]+$/)) {
        return `${str}.0`;
    }
    return str;
}
const ret = (res) => `return ${res};`;
function mat4(m00 = 0, m01 = 0, m02 = 0, m03 = 0, m10 = 0, m11 = 0, m12 = 0, m13 = 0, m20 = 0, m21 = 0, m22 = 0, m23 = 0, m30 = 0, m31 = 0, m32 = 0, m33 = 1, as = asFloat) {
    const toStr = as || ((x) => `${x}`);
    return `mat4(${toStr(m00)}, ${toStr(m01)}, ${toStr(m02)}, ${toStr(m03)}, ${toStr(m10)}, ${toStr(m11)}, ${toStr(m12)}, ${toStr(m13)}, ${toStr(m20)}, ${toStr(m21)}, ${toStr(m22)}, ${toStr(m23)}, ${toStr(m30)}, ${toStr(m31)}, ${toStr(m32)}, ${toStr(m33)})`;
}
const rotate = (funcName = 'rotate', x = 0.0, y = 0.0, z = 1.0) => `
mat4 ${funcName}(float angle) {
  float s = sin(angle);
  float c = cos(angle);
  float oc = 1.0 - c;
  ${ret(mat4(add(mul('oc', x * x), 'c'), sub(mul('oc', x * y), mul(z, 's')), add(mul('oc', z * x), mul(y, 's')), 0, add(mul('oc', x * y), mul(z, 's')), add(mul('oc', y * y), 'c'), sub(mul('oc', y * z), mul(x, 's')), 0, sub(mul('oc', z * x), mul(y, 's')), add(mul('oc', y * z), mul(x, 's')), add(mul('oc', z * z), 'c')))}
}`;
const rotateZ = (funcName = 'rotateZ') => rotate(funcName, 0, 0, 1);
export const ShaderTool = {
    add,
    asFloat,
    mat4,
    mul,
    ret,
    rotate,
    rotateZ,
    sub,
};
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