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63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
/********************************************************************
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Minecraft: Pocket Edition - Decompilation Project
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Copyright (C) 2023 iProgramInCpp
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The following code is licensed under the BSD 1 clause license.
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SPDX-License-Identifier: BSD-1-Clause
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********************************************************************/
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#include "Matrix.hpp"
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Matrix::Matrix()
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{
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c[0] = 0.0f;
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memset(c, 0, sizeof c);
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}
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Matrix::Matrix(float x)
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{
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memset(c, 0, sizeof c);
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c[0] = c[4 * 1 + 1] = c[4 * 2 + 2] = c[4 * 3 + 3] = x;
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}
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Matrix::Matrix(float* p)
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{
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memcpy(c, p, sizeof c);
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}
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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)
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{
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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;
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}
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void Matrix::fetchGL(GLenum pname)
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{
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glGetFloatv(pname, c);
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}
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Matrix operator*(const Matrix& a, const Matrix& b)
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{
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Matrix result;
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//this is ugly
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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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];
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return result;
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}
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