Support Matrix

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• [x] Translate
• [x] Scale
• [x] Rotate
• [ ] LookAt
• [ ] Orthographic
• [x] Perspective

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http://blog.csdn.net/zujack/article/details/52460227 https://www.jianshu.com/p/bfc8327eaad3

和WebGL相反, ol3d使用行主序(Row major), 左乘

void ol3d_matrix_multi_v3(ol3d_Vector3_t *a, ol3d_matrix_t b) {
    ol3d_matrix_t temp = {a->x, a->y, a->z, 1};
    ol3d_matrix_t result;
    for(unsigned char i = 0; i < 4; i++) {
        result[i] = ol3d_matrix_multi_chunk(temp, b, i);
    }
    a->x = result[0];
    a->y = result[1];
    a->z = result[2];
}

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LookAt

右手坐标系下LookAt视图矩阵的推导 详解MVP矩阵之ViewMatrix

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http://learnopengl-cn.readthedocs.io/zh/latest/01%20Getting%20started/08%20Coordinate%20Systems/