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* Initial commit.

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iProgramInCpp
2023-07-30 22:22:02 +03:00
commit 9642818a88
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52
source/Base/Matrix.cpp Normal file
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#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;
}