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Added optional parameter to mtxProj() for OGL NDC.

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This commit is contained in:
Dario Manesku
2014-10-06 07:18:06 +02:00
parent ec3e84a6c1
commit 65ba842817
1 changed files with 4 additions and 3 deletions
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7
include/bx/fpumath.h
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@@ -229,12 +229,13 @@ namespace bx
_result[15] = 1.0f;
}
inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far)
inline void mtxProj(float* _result, float _fovy, float _aspect, float _near, float _far, bool _oglNdc = false)
{
const float height = 1.0f/tanf(_fovy*( (float)M_PI/180.0f)*0.5f);
const float width = height * 1.0f/_aspect;
const float aa = _far/(_far-_near);
const float bb = -_near * aa;
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;