void CCamera::SetPerspectiveProjection(float fovY, float aspectRatio, float near, float far, HANDEDNESS handedness)
{
float yScale = 1 / tan(fovY / 2);
float xScale = yScale / aspectRatio;
CMatrix4 proj;
proj.Clear();
if(handedness == HANDEDNESS_LEFTHANDED)
{
proj(0, 0) = xScale;
proj(1, 1) = yScale;
proj(2, 2) = far / (far - near);
proj(3, 3) = 0;
proj(3, 2) = -near * far / (far - near);
proj(2, 3) = 1;
}
else
{
proj(0, 0) = xScale;
proj(1, 1) = yScale;
proj(2, 2) = far / (near - far);
proj(3, 3) = 0;
proj(3, 2) = near * far / (near - far);
proj(2, 3) = -1;
}
m_projMatrix = proj;
}
void CCamera::SetOrthoProjection(float width, float height, float near, float far)
{
CMatrix4 proj;
proj.Clear();
proj(0, 0) = 2.0f / width;
proj(1, 1) = 2.0f / height;
proj(2, 2) = 1.0f / (far - near);
proj(3, 3) = 1;
proj(3, 2) = near / (near - far);
m_projMatrix = proj;
}
void CCamera::LookAt(const CVector3& eye, const CVector3& target, const CVector3& up, HANDEDNESS handedness)
{
CMatrix4 view;
view.Clear();
if(handedness == HANDEDNESS_LEFTHANDED)
{
//zaxis = normal(At - Eye)
//xaxis = normal(cross(Up, zaxis))
//yaxis = cross(zaxis, xaxis)
CVector3 axisZ = (target - eye).Normalize();
CVector3 axisX = (up.Cross(axisZ)).Normalize();
CVector3 axisY = axisZ.Cross(axisX);
view(0, 0) = axisX.x;
view(1, 0) = axisX.y;
view(2, 0) = axisX.z;
view(3, 0) = -axisX.Dot(eye);
view(0, 1) = axisY.x;
view(1, 1) = axisY.y;
view(2, 1) = axisY.z;
view(3, 1) = -axisY.Dot(eye);
view(0, 2) = axisZ.x;
view(1, 2) = axisZ.y;
view(2, 2) = axisZ.z;
view(3, 2) = -axisZ.Dot(eye);
view(3, 3) = 1;
}
else
{
//zaxis = normal(Eye - At)
//xaxis = normal(cross(Up, zaxis))
//yaxis = cross(zaxis, xaxis)
CVector3 axisZ = (eye - target).Normalize();
CVector3 axisX = (up.Cross(axisZ)).Normalize();
CVector3 axisY = axisZ.Cross(axisX);
view(0, 0) = axisX.x;
view(1, 0) = axisX.y;
view(2, 0) = axisX.z;
view(3, 0) = -axisX.Dot(eye);
view(0, 1) = axisY.x;
view(1, 1) = axisY.y;
view(2, 1) = axisY.z;
view(3, 1) = -axisY.Dot(eye);
view(0, 2) = axisZ.x;
view(1, 2) = axisZ.y;
view(2, 2) = axisZ.z;
view(3, 2) = -axisZ.Dot(eye);
view(3, 3) = 1;
}
m_viewMatrix = view;
}