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xr_interface_reference.cpp
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xr_interface_reference.cpp
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#include "xr_interface_reference.h"
#include <godot_cpp/core/class_db.hpp>
#include <godot_cpp/variant/utility_functions.hpp>
#include <godot_cpp/classes/display_server.hpp>
#include <godot_cpp/classes/input.hpp>
using namespace godot;
void XRInterfaceReference::_bind_methods() {
// Methods.
// ClassDB::bind_method(D_METHOD("simple_func"), &Example::simple_func);
// Properties.
ClassDB::bind_method(D_METHOD("get_eye_height"), &XRInterfaceReference::get_eye_height);
ClassDB::bind_method(D_METHOD("set_eye_height", "eye_height"), &XRInterfaceReference::set_eye_height);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "eye_height"), "set_eye_height", "get_eye_height");
ClassDB::bind_method(D_METHOD("get_intraocular_dist"), &XRInterfaceReference::get_intraocular_dist);
ClassDB::bind_method(D_METHOD("set_intraocular_dist", "intraocular_dist"), &XRInterfaceReference::set_intraocular_dist);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "intraocular_dist"), "set_intraocular_dist", "get_intraocular_dist");
ClassDB::bind_method(D_METHOD("get_display_width"), &XRInterfaceReference::get_display_width);
ClassDB::bind_method(D_METHOD("set_display_width", "display_width"), &XRInterfaceReference::set_display_width);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "display_width"), "set_display_width", "get_display_width");
ClassDB::bind_method(D_METHOD("get_display_to_lens"), &XRInterfaceReference::get_display_to_lens);
ClassDB::bind_method(D_METHOD("set_display_to_lens", "display_to_lens"), &XRInterfaceReference::set_display_to_lens);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "display_to_lens"), "set_display_to_lens", "get_display_to_lens");
ClassDB::bind_method(D_METHOD("get_oversample"), &XRInterfaceReference::get_oversample);
ClassDB::bind_method(D_METHOD("set_oversample", "oversample"), &XRInterfaceReference::set_oversample);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "oversample"), "set_oversample", "get_oversample");
ClassDB::bind_method(D_METHOD("get_k1"), &XRInterfaceReference::get_k1);
ClassDB::bind_method(D_METHOD("set_k1", "k1"), &XRInterfaceReference::set_k1);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "k1"), "set_k1", "get_k1");
ClassDB::bind_method(D_METHOD("get_k2"), &XRInterfaceReference::get_k2);
ClassDB::bind_method(D_METHOD("set_k2", "k2"), &XRInterfaceReference::set_k2);
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "k2"), "set_k2", "get_k2");
ClassDB::bind_method(D_METHOD("get_use_mouse_for_headtracking"), &XRInterfaceReference::get_use_mouse_for_headtracking);
ClassDB::bind_method(D_METHOD("set_use_mouse_for_headtracking", "use_mouse_for_headtracking"), &XRInterfaceReference::set_use_mouse_for_headtracking);
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_mouse_for_headtracking"), "set_use_mouse_for_headtracking", "get_use_mouse_for_headtracking");
ClassDB::bind_method(D_METHOD("get_use_wasd_for_movement"), &XRInterfaceReference::get_use_wasd_for_movement);
ClassDB::bind_method(D_METHOD("set_use_wasd_for_movement", "use_wasd_for_movement"), &XRInterfaceReference::set_use_wasd_for_movement);
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_wasd_for_movement"), "set_use_wasd_for_movement", "get_use_wasd_for_movement");
// Signals.
// ADD_SIGNAL(MethodInfo("custom_signal", PropertyInfo(Variant::STRING, "name"), PropertyInfo(Variant::INT, "value")));
// ClassDB::bind_method(D_METHOD("emit_custom_signal", "name", "value"), &Example::emit_custom_signal);
// Constants.
// BIND_ENUM_CONSTANT(FIRST);
}
double XRInterfaceReference::get_eye_height() const {
return eye_height;
}
void XRInterfaceReference::set_eye_height(const double p_eye_height) {
eye_height = p_eye_height;
}
double XRInterfaceReference::get_intraocular_dist() const {
return intraocular_dist;
}
void XRInterfaceReference::set_intraocular_dist(const double p_intraocular_dist) {
intraocular_dist = p_intraocular_dist;
}
double XRInterfaceReference::get_display_width() const {
return display_width;
}
void XRInterfaceReference::set_display_width(const double p_display_width) {
display_width = p_display_width;
}
double XRInterfaceReference::get_display_to_lens() const {
return display_to_lens;
}
void XRInterfaceReference::set_display_to_lens(const double p_display_to_lens) {
display_to_lens = p_display_to_lens;
}
double XRInterfaceReference::get_oversample() const {
return oversample;
}
void XRInterfaceReference::set_oversample(const double p_oversample) {
oversample = p_oversample;
}
double XRInterfaceReference::get_k1() const {
return k1;
}
void XRInterfaceReference::set_k1(const double p_k1) {
k1 = p_k1;
}
double XRInterfaceReference::get_k2() const {
return k2;
}
void XRInterfaceReference::set_k2(const double p_k2) {
k2 = p_k2;
}
bool XRInterfaceReference::get_use_mouse_for_headtracking() const {
return use_mouse_for_headtracking;
}
void XRInterfaceReference::set_use_mouse_for_headtracking(bool p_use_mouse_for_headtracking) {
use_mouse_for_headtracking = p_use_mouse_for_headtracking;
}
bool XRInterfaceReference::get_use_wasd_for_movement() const {
return use_wasd_for_movement;
}
void XRInterfaceReference::set_use_wasd_for_movement(bool p_use_wasd_for_movement) {
use_wasd_for_movement = p_use_wasd_for_movement;
}
StringName XRInterfaceReference::_get_name() const {
// this currently fails to return because we loose our data before it ends up in the callers hands...
StringName name("XR Reference");
return name;
}
uint32_t XRInterfaceReference::_get_capabilities() const {
return XR_STEREO;
}
bool XRInterfaceReference::_is_initialized() const {
return initialised;
}
bool XRInterfaceReference::_initialize() {
if (!initialised) {
// do any initialisation here..
xr_server = XRServer::get_singleton();
if (xr_server == nullptr) {
ERR_FAIL_V_MSG(false, "Couldn't obtain XRServer singleton");
}
// we must create a tracker for our head
head.instantiate();
head->set_tracker_type(XRServer::TRACKER_HEAD);
head->set_tracker_name("head");
head->set_tracker_desc("Players head");
xr_server->add_tracker(head);
// set this as our primary interface
xr_server->set_primary_interface(this);
initialised = true;
}
return initialised;
}
void XRInterfaceReference::_uninitialize() {
if (initialised) {
// do any cleanup here...
if (head.is_valid()) {
xr_server->remove_tracker(head);
head.unref();
}
initialised = false;
xr_server = nullptr;
}
}
XRInterface::TrackingStatus XRInterfaceReference::_get_tracking_status() const {
return XRInterface::XR_UNKNOWN_TRACKING;
}
Vector2 XRInterfaceReference::_get_render_target_size() {
// TODO get access to display server singleton
// we use half our window size
DisplayServer *display_server = DisplayServer::get_singleton();
if (display_server == nullptr) {
return Vector2();
}
Vector2 target_size = display_server->window_get_size();
target_size.x = target_size.x * 0.5 * oversample;
target_size.y = target_size.y * oversample;
return target_size;
}
uint32_t XRInterfaceReference::_get_view_count() {
return 2; // stereo
}
Transform3D XRInterfaceReference::_get_camera_transform() {
if (!initialised) {
return Transform3D();
}
Transform3D adj_head_transform = head_transform;
double world_scale = xr_server->get_world_scale();
adj_head_transform.origin *= world_scale;
return xr_server->get_reference_frame() * adj_head_transform;
}
Transform3D XRInterfaceReference::_get_transform_for_view(uint32_t p_view, const Transform3D &p_cam_transform) {
if (!initialised) {
return Transform3D();
}
Transform3D eye_transform;
double world_scale = xr_server->get_world_scale();
if (p_view == 0) {
eye_transform.origin.x = -(intraocular_dist * 0.01 * 0.5 * world_scale);
} else if (p_view == 1) {
eye_transform.origin.x = intraocular_dist * 0.01 * 0.5 * world_scale;
}
Transform3D adj_head_transform = head_transform;
adj_head_transform.origin *= world_scale;
return p_cam_transform * xr_server->get_reference_frame() * adj_head_transform * eye_transform;
}
PackedFloat64Array XRInterfaceReference::_get_projection_for_view(uint32_t p_view, double p_aspect, double p_z_near, double p_z_far) {
PackedFloat64Array arr;
arr.resize(16); // 4x4 matrix
aspect = p_aspect;
// We don't have access to CameraMatrix here so we'll need to duplicate some code here..
/*
eye.set_for_hmd(p_view + 1, p_aspect, intraocular_dist, display_width, display_to_lens, oversample, p_z_near, p_z_far);
*/
// we first calculate our base frustum on our values without taking our lens magnification into account.
double f1 = (intraocular_dist * 0.5) / display_to_lens;
double f2 = ((display_width - intraocular_dist) * 0.5) / display_to_lens;
double f3 = (display_width / 4.0) / display_to_lens;
// now we apply our oversample factor to increase our FOV. how much we oversample is always a balance we strike between performance and how much
// we're willing to sacrifice in FOV.
double add = ((f1 + f2) * (oversample - 1.0)) / 2.0;
f1 += add;
f2 += add;
f3 *= oversample;
// always apply KEEP_WIDTH aspect ratio
f3 /= p_aspect;
double left,right,top,bottom;
if (p_view == 0) { // left eye
left = -f2 * p_z_near;
right = f1 * p_z_near;
bottom = -f3 * p_z_near;
top = f3 * p_z_near;
} else {
left = -f1 * p_z_near;
right = f2 * p_z_near;
bottom = -f3 * p_z_near;
top = f3 * p_z_near;
}
double x = 2 * p_z_near / (right - left);
double y = 2 * p_z_near / (top - bottom);
double a = (right + left) / (right - left);
double b = (top + bottom) / (top - bottom);
double c = -(p_z_far + p_z_near) / (p_z_far - p_z_near);
double d = -2 * p_z_far * p_z_near / (p_z_far - p_z_near);
arr.set(0, x);
arr.set(1, 0);
arr.set(2, 0);
arr.set(3, 0);
arr.set(4, 0);
arr.set(5, y);
arr.set(6, 0);
arr.set(7, 0);
arr.set(8, a);
arr.set(9, b);
arr.set(10, c);
arr.set(11, -1);
arr.set(12, 0);
arr.set(13, 0);
arr.set(14, d);
arr.set(15, 0.0);
return arr;
}
void XRInterfaceReference::_post_draw_viewport(const RID &p_render_target, const Rect2 &p_screen_rect) {
Rect2 src_rect(0.0f, 0.0f, 1.0f, 1.0f);
Rect2 dst_rect = p_screen_rect;
// halve our width
Vector2 size = dst_rect.get_size();
size.x = size.x * 0.5;
dst_rect.size = size;
Vector2 eye_center(((-intraocular_dist / 2.0) + (display_width / 4.0)) / (display_width / 2.0), 0.0);
add_blit(p_render_target, src_rect, dst_rect, true, 0, true, eye_center, k1, k2, oversample, aspect);
// move rect
Vector2 pos = dst_rect.get_position();
pos.x = size.x;
dst_rect.position = pos;
eye_center.x = ((intraocular_dist / 2.0) - (display_width / 4.0)) / (display_width / 2.0);
add_blit(p_render_target, src_rect, dst_rect, true, 1, true, eye_center, k1, k2, oversample, aspect);
}
void XRInterfaceReference::_process() {
// Emulate a headsets movement through space, we thus update the position and orientation relative to the origin point
// update our head transform in world space
if (use_mouse_for_headtracking) {
Vector2 mouse_speed = Input::get_singleton()->get_last_mouse_velocity();
// we're missing a delta here so frame rate sensative
double fps = 90.0;
angle_x -= mouse_speed.x / fps;
angle_y -= mouse_speed.y / fps;
if (angle_y < -90.0) {
angle_y = -90.0;
} else if (angle_y >= 90.0) {
angle_y = 90.0;
}
Basis basis;
basis.rotate(Vector3(1.0, 0.0, 0.0), 3.14159265359 * angle_y/ 180);
basis.rotate(Vector3(0.0, 1.0, 0.0), 3.14159265359 * angle_x/ 180);
head_transform.basis = basis;
}
// move our head through space
if (use_wasd_for_movement) {
// get our movement vectors
Vector3 forward = -head_transform.basis.get_column(2); // might need to be get_column
Vector3 sideways = head_transform.basis.get_column(0);
forward.y = 0.0;
forward.normalize();
sideways.y = 0.0;
sideways.normalize();
// we're missing a delta here so frame rate sensative
double fps = 90.0;
double speed = 5.0;
Input * input = Input::get_singleton();
if (input->is_key_pressed(KEY_W)) {
head_transform.origin += speed * forward / fps;
} else if (input->is_key_pressed(KEY_S)) {
head_transform.origin -= speed * forward / fps;
}
if (input->is_key_pressed(KEY_D)) {
head_transform.origin += speed * sideways / fps;
} else if (input->is_key_pressed(KEY_A)) {
head_transform.origin -= speed * sideways / fps;
}
}
// set height
head_transform.origin.y = eye_height;
if (head.is_valid()) {
// Set our head position, note in real space, reference frame and world scale is applied later
head->set_pose("default", head_transform, Vector3(), Vector3(), XRPose::XR_TRACKING_CONFIDENCE_HIGH);
}
}
bool XRInterfaceReference::_get_anchor_detection_is_enabled() const {
return false;
}
void XRInterfaceReference::_set_anchor_detection_is_enabled(bool enabled) {
}
int32_t XRInterfaceReference::_get_camera_feed_id() const {
return 0;
}
XRInterfaceReference::XRInterfaceReference() {
}
XRInterfaceReference::~XRInterfaceReference() {
}