migrate ALMOST everything from source tree into client

source/client/common/Matrix.cpp

@@ -0,0 +1,60 @@
+/********************************************************************
+	Minecraft: Pocket Edition - Decompilation Project
+	Copyright (C) 2023 iProgramInCpp
+	
+	The following code is licensed under the BSD 1 clause license.
+	SPDX-License-Identifier: BSD-1-Clause
+ ********************************************************************/
+
+#include "Matrix.hpp"
+
+Matrix::Matrix()
+{
+	memset(c, 0, sizeof c);
+}
+
+Matrix::Matrix(float x)
+{
+	memset(c, 0, sizeof c);
+	c[0] = c[4 * 1 + 1] = c[4 * 2 + 2] = c[4 * 3 + 3] = x;
+}
+
+Matrix::Matrix(float* p)
+{
+	memcpy(c, p, sizeof c);
+}
+
+Matrix::Matrix(float a, float b, float q, float d, float e, float f, float g, float h, float i, float j, float k, float l, float m, float n, float o, float p)
+{
+	c[0] = a, c[1] = b, c[2] = q, c[3] = d, c[4] = e, c[5] = f, c[6] = g, c[7] = h, c[8] = i, c[9] = j, c[10] = k, c[11] = l, c[12] = m, c[13] = n, c[14] = o, c[15] = p;
+}
+
+void Matrix::fetchGL(GLenum pname)
+{
+	glGetFloatv(pname, c);
+}
+
+Matrix operator*(const Matrix& a, const Matrix& b)
+{
+	Matrix result;
+
+	//this is ugly
+	result.c[0]  = a.c[0]  * b.c[0] + a.c[1]  * b.c[4] + a.c[2]  * b.c[8]  + a.c[3]  * b.c[12];
+	result.c[1]  = a.c[0]  * b.c[1] + a.c[1]  * b.c[5] + a.c[2]  * b.c[9]  + a.c[3]  * b.c[13];
+	result.c[2]  = a.c[0]  * b.c[2] + a.c[1]  * b.c[6] + a.c[2]  * b.c[10] + a.c[3]  * b.c[14];
+	result.c[3]  = a.c[0]  * b.c[3] + a.c[1]  * b.c[7] + a.c[2]  * b.c[11] + a.c[3]  * b.c[15];
+	result.c[4]  = a.c[4]  * b.c[0] + a.c[5]  * b.c[4] + a.c[6]  * b.c[8]  + a.c[7]  * b.c[12];
+	result.c[5]  = a.c[4]  * b.c[1] + a.c[5]  * b.c[5] + a.c[6]  * b.c[9]  + a.c[7]  * b.c[13];
+	result.c[6]  = a.c[4]  * b.c[2] + a.c[5]  * b.c[6] + a.c[6]  * b.c[10] + a.c[7]  * b.c[14];
+	result.c[7]  = a.c[4]  * b.c[3] + a.c[5]  * b.c[7] + a.c[6]  * b.c[11] + a.c[7]  * b.c[15];
+	result.c[8]  = a.c[8]  * b.c[0] + a.c[9]  * b.c[4] + a.c[10] * b.c[8]  + a.c[11] * b.c[12];
+	result.c[9]  = a.c[8]  * b.c[1] + a.c[9]  * b.c[5] + a.c[10] * b.c[9]  + a.c[11] * b.c[13];
+	result.c[10] = a.c[8]  * b.c[2] + a.c[9]  * b.c[6] + a.c[10] * b.c[10] + a.c[11] * b.c[14];
+	result.c[11] = a.c[8]  * b.c[3] + a.c[9]  * b.c[7] + a.c[10] * b.c[11] + a.c[11] * b.c[15];
+	result.c[12] = a.c[12] * b.c[0] + a.c[13] * b.c[4] + a.c[14] * b.c[8]  + a.c[15] * b.c[12];
+	result.c[13] = a.c[12] * b.c[1] + a.c[13] * b.c[5] + a.c[14] * b.c[9]  + a.c[15] * b.c[13];
+	result.c[14] = a.c[12] * b.c[2] + a.c[13] * b.c[6] + a.c[14] * b.c[10] + a.c[15] * b.c[14];
+	result.c[15] = a.c[12] * b.c[3] + a.c[13] * b.c[7] + a.c[14] * b.c[11] + a.c[15] * b.c[15];
+
+	return result;
+}