pixi-live2d/src/lib/MatrixStack.js

Display live2D model as a sprite in pixi.js.

/**
 *
 *  You can modify and use this source freely
 *  only for the development of application related Live2D.
 *
 *  (c) Live2D Inc. All rights reserved.
 *  (c) Modified by Icemic <bingfeng.web@gmail.com>
 */

const mat4 = require('./glMatrix-mat4');

const MatrixStack = {};

export default MatrixStack;


MatrixStack.matrixStack = [
    1, 0, 0, 0,
    0, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1
];


MatrixStack.depth = 0;


MatrixStack.currentMatrix = [
    1, 0, 0, 0,
    0, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1
];


MatrixStack.tmp = new Array(16);



MatrixStack.reset = function()
{
    this.depth = 0;
}



MatrixStack.loadIdentity = function()
{
    // for (var i = 0; i < 16; i++)
    // {
    //     this.currentMatrix[i] = (i % 5 == 0) ? 1 : 0;
    // }
    this.currentMatrix = [
        1, 0, 0, 0,
        0, 1, 0, 0,
        0, 0, 1, 0,
        0, 0, 0, 1
    ];
}



MatrixStack.push = function()
{
    // var offset = this.depth * 16;
    // var nextOffset = (this.depth + 1) * 16;

    // if (this.matrixStack.length < nextOffset + 16)
    // {
    //     this.matrixStack.length = nextOffset + 16;
    // }

    // for (var i = 0; i < 16; i++)
    // {
    //     this.matrixStack[nextOffset + i] = this.currentMatrix[i];
    // }
    this.matrixStack.push(this.currentMatrix);

    this.depth++;
}



MatrixStack.pop = function()
{
    this.depth--;
    if (this.depth < 0)
    {
        myError("Invalid matrix stack.");
        this.depth = 0;
    }

    // var offset = this.depth * 16;
    // for (var i = 0; i < 16; i++)
    // {
    //     this.currentMatrix[i] = this.matrixStack[offset + i];
    // }
    this.currentMatrix = this.matrixStack.pop();
}



MatrixStack.getMatrix = function()
{
    return this.currentMatrix;
}



MatrixStack.multMatrix = function(matNew)
{
    // var i, j, k;

    // for (i = 0; i < 16; i++)
    // {
    //     this.tmp[i] = 0;
    // }

    // for (i = 0; i < 4; i++)
    // {
    //     for (j = 0; j < 4; j++)
    //     {
    //         for (k = 0; k < 4; k++)
    //         {
    //             this.tmp[i + j * 4] += this.currentMatrix[i + k * 4] * matNew[k + j * 4];
    //         }
    //     }
    // }
    // for (i = 0; i < 16; i++)
    // {
    //     this.currentMatrix[i] = this.tmp[i];
    // }
    mat4.multiply(this.currentMatrix, this.currentMatrix, matNew);
}