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#pragma once
//Don't include this file unless you know what you are doing and need to _directly_ interface with OpenXR
#include "openxr.h"
#include <type_traits>
#include <tl/optional.hpp>
#ifndef __APPLE_CC__
#include <openxr/openxr.h>
#include <openxr/openxr_platform.h>
struct XrSwapchainHandler {
XrSwapchain swapchain;
int64_t format;
uint32_t width;
uint32_t height;
~XrSwapchainHandler() {
xrDestroySwapchain(swapchain);
}
};
extern bool openxr_initialized; //is true if initialization was successfull. Does NOT imply that we can render right now!
extern XrInstance xr_instance;
extern XrSystemId xr_system;
extern XrSession xr_session;
extern XrSpace xr_space;
extern XrTime xr_time; //The last known time something happened. May be the last state change or the (predicted) time of the last frame
extern std::array<std::unique_ptr<XrSwapchainHandler>, 2> xr_swapchains;
extern std::array<XrView, 2> xr_views;
extern XrFrameState xr_state;
extern vec3d xr_offset;
enum class OpenXRFBStage { NONE, FIRST, SECOND };
extern OpenXRFBStage xr_stage; //State machine tracker for rendering. Needed since OpenXR needs to be able to tell whether this is a stereoscopic frame or not whenever the code flips
void openxr_start_frame();
void openxr_reset_offset();
template<typename openxr_fnc, typename... arg_t>
tl::optional<typename std::result_of<openxr_fnc(arg_t...)>::type> openxr_callExtensionFunction(const char* const name, arg_t&&... args) {
openxr_fnc func;
if (xrGetInstanceProcAddr(xr_instance, name, (PFN_xrVoidFunction*)&func) != XR_SUCCESS) {
return tl::nullopt;
}
return func(std::forward<arg_t>(args)...);
}
#endif
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