void CameraMatrix::set_perspective(real_t p_fovy_degrees, real_t p_aspect, real_t p_z_near, real_t p_z_far, bool p_flip_fov) {
if (p_flip_fov) {
p_fovy_degrees = get_fovy(p_fovy_degrees, 1.0 / p_aspect);
}
real_t sine, cotangent, deltaZ;
real_t radians = p_fovy_degrees / 2.0 * Math_PI / 180.0;
deltaZ = p_z_far - p_z_near;
sine = Math::sin(radians);
if ((deltaZ == 0) || (sine == 0) || (p_aspect == 0)) {
return;
}
cotangent = Math::cos(radians) / sine;
set_identity();
matrix[0][0] = cotangent / p_aspect;
matrix[1][1] = cotangent;
matrix[2][2] = -(p_z_far + p_z_near) / deltaZ;
matrix[2][3] = -1;
matrix[3][2] = -2 * p_z_near * p_z_far / deltaZ;
matrix[3][3] = 0;
}
void CameraMatrix::set_perspective(real_t p_fovy_degrees, real_t p_aspect, real_t p_z_near, real_t p_z_far, bool p_flip_fov, int p_eye, real_t p_intraocular_dist, real_t p_convergence_dist) {
if (p_flip_fov) {
p_fovy_degrees = get_fovy(p_fovy_degrees, 1.0 / p_aspect);
}
real_t left, right, modeltranslation, ymax, xmax, frustumshift;
ymax = p_z_near * tan(p_fovy_degrees * Math_PI / 360.0f);
xmax = ymax * p_aspect;
frustumshift = (p_intraocular_dist / 2.0) * p_z_near / p_convergence_dist;
switch (p_eye) {
case 1: { // left eye
left = -xmax + frustumshift;
right = xmax + frustumshift;
modeltranslation = p_intraocular_dist / 2.0;
}; break;
case 2: { // right eye
left = -xmax - frustumshift;
right = xmax - frustumshift;
modeltranslation = -p_intraocular_dist / 2.0;
}; break;
default: { // mono, should give the same result as set_perspective(p_fovy_degrees,p_aspect,p_z_near,p_z_far,p_flip_fov)
left = -xmax;
right = xmax;
modeltranslation = 0.0;
}; break;
};
set_frustum(left, right, -ymax, ymax, p_z_near, p_z_far);
// translate matrix by (modeltranslation, 0.0, 0.0)
CameraMatrix cm;
cm.set_identity();
cm.matrix[3][0] = modeltranslation;
*this = *this * cm;
}
