void Camera::BuildProjectionMatrix()
{
float d = 1.0f;
//float d = tan( Maths::MathHelper::ToRadian( m_fov ) / 2 );
m_projectionMatrix( 0, 0 ) = -d;
m_projectionMatrix( 1, 1 ) = -d * m_aspectRatio;
m_projectionMatrix( 2, 2 ) = 1.0f;
//m_projectionMatrix._m[2][2] = -d;
m_projectionMatrix( 3, 2 ) = 1.0f;
m_projectionMatrix( 3, 3 ) = 0.0f;
}
void Camera::getGLProjectionMatrixf(float* matrix)
{
for (unsigned int i = 0; i < 4; ++i){
for (unsigned int j = 0; j < 4; ++j){
matrix[i * 4 + j] = m_projectionMatrix(j, i);
}
}
}
void Camera::setPerspProjection()
{
float f= 1.0/tan(Utilities::u_radians(m_FOV)/2.0);
m_projectionMatrix.setIdentity();
m_projectionMatrix(0,0)=f/m_aspect;
m_projectionMatrix(1,1)=f;
m_projectionMatrix(2,2)=(m_farPlane+m_nearPlane)/(m_nearPlane-m_farPlane);
m_projectionMatrix(3,2)=(2*m_farPlane*m_nearPlane)/(m_nearPlane-m_farPlane);
m_projectionMatrix(2,3)=-1;
m_projectionMatrix(3,3)=1.0;
}
void Camera::computeProjectionMatrix()
{
switch (m_type)
{
case CameraType::PERSPECTIVE:
{
const float f = 1.0 / tan(m_fieldOfView / 2.0);
m_projectionMatrix(0, 0) = f / getAspectRatio();
m_projectionMatrix(1, 1) = f;
m_projectionMatrix(2, 2) = (m_nearPlane + m_farPlane) / (m_nearPlane - m_farPlane);
m_projectionMatrix(3, 2) = -1.0;
m_projectionMatrix(2, 3) = 2.0 * m_nearPlane * m_farPlane / (m_nearPlane - m_farPlane);
m_projectionMatrix(3, 3) = 0.0;
// same as gluPerspective( 180.0*fieldOfView()/M_PI, aspectRatio(), zNear(), zFar() );
break;
}
case CameraType::ORTHOGRAPHIC:
{
m_projectionMatrix(0, 0) = 1.0 / static_cast<float>(m_screenWidth);
m_projectionMatrix(1, 1) = 1.0 / static_cast<float>(m_screenHeight);
m_projectionMatrix(2, 2) = -2.0 / (m_farPlane - m_nearPlane);
m_projectionMatrix(3, 2) = 0.0;
m_projectionMatrix(2, 3) = (m_farPlane + m_nearPlane) / (m_nearPlane - m_farPlane);
m_projectionMatrix(3, 3) = 1.0;
// same as glOrtho( -w, w, -h, h, zNear(), zFar() );
break;
}
}
}
