mirror of https://github.com/AxioDL/zeus.git
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
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#include "CProjection.hpp"
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#include <math.h>
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void CProjection::_updateCachedMatrix()
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{
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if (m_projType == PROJ_ORTHO)
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{
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float tmp;
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tmp = 1.0f / (m_ortho.m_right - m_ortho.m_left);
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m_mtx.m[0][0] = 2.0f * tmp;
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m_mtx.m[1][0] = 0.0f;
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m_mtx.m[2][0] = 0.0f;
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m_mtx.m[3][0] = -(m_ortho.m_right + m_ortho.m_left) * tmp;
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tmp = 1.0f / (m_ortho.m_top - m_ortho.m_bottom);
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m_mtx.m[0][1] = 0.0f;
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m_mtx.m[1][1] = 2.0f * tmp;
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m_mtx.m[2][1] = 0.0f;
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m_mtx.m[3][1] = -(m_ortho.m_top + m_ortho.m_bottom) * tmp;
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tmp = 1.0f / (m_ortho.m_far - m_ortho.m_near);
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m_mtx.m[0][2] = 0.0f;
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m_mtx.m[1][2] = 0.0f;
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m_mtx.m[2][2] = -(1.0f) * tmp;
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m_mtx.m[3][2] = -m_ortho.m_far * tmp;
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m_mtx.m[0][3] = 0.0f;
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m_mtx.m[1][3] = 0.0f;
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m_mtx.m[2][3] = 0.0f;
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m_mtx.m[3][3] = 1.0f;
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}
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else if (m_projType == PROJ_PERSP)
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{
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float cot,tmp;
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float t_fovy = tanf(m_persp.m_fov / 2.0);
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cot = 1.0f / t_fovy;
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m_mtx.m[0][0] = cot/m_persp.m_aspect;
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m_mtx.m[1][0] = 0.0f;
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m_mtx.m[2][0] = 0.0f;
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m_mtx.m[3][0] = 0.0f;
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m_mtx.m[0][1] = 0.0f;
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m_mtx.m[1][1] = cot;
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m_mtx.m[2][1] = 0.0f;
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m_mtx.m[3][1] = 0.0f;
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tmp = 1.0f / (m_persp.m_far - m_persp.m_near);
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m_mtx.m[0][2] = 0.0f;
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m_mtx.m[1][2] = 0.0f;
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m_mtx.m[2][2] = -m_persp.m_far * tmp;
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m_mtx.m[3][2] = -(m_persp.m_far * m_persp.m_near) * tmp;
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m_mtx.m[0][3] = 0.0f;
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m_mtx.m[1][3] = 0.0f;
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m_mtx.m[2][3] = -1.0f;
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m_mtx.m[3][3] = 0.0f;
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}
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else
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throw std::runtime_error("attempted to cache invalid projection type");
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}
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