soft-3d-renderer/Source/Matrix.hpp

#pragma once


class Matrix
{
public:
	Matrix()
	{
		e11 = 1.0; e12 = 0.0; e13 = 0.0; e14 = 0.0;
		e21 = 0.0; e22 = 1.0; e23 = 0.0; e24 = 0.0;
		e31 = 0.0; e32 = 0.0; e33 = 1.0; e34 = 0.0;
		e41 = 0.0; e42 = 0.0; e43 = 0.0; e44 = 1.0;
	}

	union
	{
		float e[4][4];

		struct
		{
			float e11, e12, e13, e14;
			float e21, e22, e23, e24;
			float e31, e32, e33, e34;
			float e41, e42, e43, e44;
		};
	};

	Matrix operator*(Matrix const& rhs)
	{
		Matrix result;

		for (int row = 0; row < 4; ++row)
		{
			for (int col = 0; col < 4; ++col)
			{
				float sum = 0.0;

				for (int i = 0; i < 4; ++i)
				{
					sum += e[row][i] * rhs.e[i][col];
				}

				result.e[row][col] = sum;
			}
		}

		return result;
	}
};