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Added mtxProj from FOV.

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This commit is contained in:
Branimir Karadžić
2014-10-26 14:32:20 -07:00
parent 6b39d25a92
commit 2f9debfcc7
1 changed files with 26 additions and 5 deletions
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31
include/bx/fpumath.h
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@@ -231,22 +231,43 @@ namespace bx
_result[15] = 1.0f;
}
inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far, bool _oglNdc = false)
inline void mtxProjXYWH(float* _result, float _x, float _y, float _width, float _height, float _near, float _far, bool _oglNdc = false)
{
const float height = 1.0f/tanf(toRad(_fovy)*0.5f);
const float width = height * 1.0f/_aspect;
const float diff = _far-_near;
const float aa = _oglNdc ? (_far+_near)/diff : _far/diff;
const float bb = _oglNdc ? -(2.0f*_far*_near)/diff : -_near*aa;
memset(_result, 0, sizeof(float)*16);
_result[0] = width;
_result[5] = height;
_result[ 0] = _width;
_result[ 5] = _height;
_result[ 8] = _x;
_result[ 9] = -_y;
_result[10] = aa;
_result[11] = 1.0f;
_result[14] = bb;
}
inline void mtxProj(float* _result, float _ut, float _dt, float _lt, float _rt, float _near, float _far, bool _oglNdc = false)
{
const float width = 2.0f / (_lt + _rt);
const float height = 2.0f / (_ut + _dt);
const float xx = (_lt - _rt) * width * 0.5f;
const float yy = (_ut - _dt) * height * 0.5f;
mtxProjXYWH(_result, xx, yy, width, height, _near, _far, _oglNdc);
}
inline void mtxProj(float* _result, const float _fov[4], float _near, float _far, bool _oglNdc = false)
{
mtxProj(_result, _fov[0], _fov[1], _fov[2], _fov[3], _near, _far, _oglNdc);
}
inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far, bool _oglNdc = false)
{
const float height = 1.0f/tanf(toRad(_fovy)*0.5f);
const float width = height * 1.0f/_aspect;
mtxProjXYWH(_result, 0.0f, 0.0f, width, height, _near, _far, _oglNdc);
}
inline void mtxOrtho(float* _result, float _left, float _right, float _bottom, float _top, float _near, float _far)
{
const float aa = 2.0f/(_right - _left);