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satoruhiga/getCurrentFov.cpp

Last active April 3, 2016 14:47
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getCurrentFov.cpp
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getCurrentFov.cpp
float getCurrentFov()
{
GLfloat m[16];
GLint viewport[4];
glGetFloatv(GL_PROJECTION_MATRIX, m);
glGetIntegerv(GL_VIEWPORT, viewport);
float aspect = (float)viewport[2] / viewport[3];
// m[0] / aspect = cot(fovy / 2)
float a = (m[0] * aspect);
float fov = (atan(a) - M_PI_2) * -2;
return ofRadToDeg(fov);
}
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