#pragma once

//OpenXR
#define XR_USE_GRAPHICS_API_OPENGL_ES 1
#define XR_USE_PLATFORM_ANDROID 1
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <jni.h>
#include <math.h>
#include <openxr.h>
#include <openxr_platform.h>

#define ALOGE(...) printf(__VA_ARGS__)
#define ALOGV(...) printf(__VA_ARGS__)

typedef union {
	XrCompositionLayerProjection Projection;
	XrCompositionLayerCylinderKHR Cylinder;
} ovrCompositorLayer_Union;

enum { ovrMaxLayerCount = 1 };
enum { ovrMaxNumEyes = 2 };

#define GL(func) func;
#define OXR(func) func;

typedef struct {
	JavaVM* Vm;
	jobject ActivityObject;
	JNIEnv* Env;
	char AppName[64];
	int AppVersion;
} ovrJava;

typedef struct {
	XrSwapchain Handle;
	uint32_t Width;
	uint32_t Height;
} ovrSwapChain;

typedef struct {
	int Width;
	int Height;
	uint32_t TextureSwapChainLength;
	uint32_t TextureSwapChainIndex;
	ovrSwapChain ColorSwapChain;
	XrSwapchainImageOpenGLESKHR* ColorSwapChainImage;
	unsigned int* DepthBuffers;
	unsigned int* FrameBuffers;
} ovrFramebuffer;

typedef struct {
	ovrFramebuffer FrameBuffer[ovrMaxNumEyes];
} ovrRenderer;

typedef struct {
	int Focused;

	XrInstance Instance;
	XrSession Session;
	XrViewConfigurationProperties ViewportConfig;
	XrViewConfigurationView ViewConfigurationView[ovrMaxNumEyes];
	XrSystemId SystemId;
	XrSpace HeadSpace;
	XrSpace StageSpace;
	XrSpace FakeStageSpace;
	XrSpace CurrentSpace;
	int SessionActive;

	int SwapInterval;
	// These threads will be marked as performance threads.
	int MainThreadTid;
	int RenderThreadTid;
	ovrCompositorLayer_Union Layers[ovrMaxLayerCount];
	int LayerCount;

	int TouchPadDownLastFrame;
	ovrRenderer Renderer;
} ovrApp;

typedef struct {
	uint64_t frameIndex;
	ovrApp appState;
	ovrJava java;
	float predictedDisplayTime;
} engine_t;

void ovrApp_Clear(ovrApp* app);
void ovrApp_Destroy(ovrApp* app);
int ovrApp_HandleXrEvents(ovrApp* app);

void ovrFramebuffer_Acquire(ovrFramebuffer* frameBuffer);
void ovrFramebuffer_Resolve(ovrFramebuffer* frameBuffer);
void ovrFramebuffer_Release(ovrFramebuffer* frameBuffer);
void ovrFramebuffer_SetCurrent(ovrFramebuffer* frameBuffer);
void ovrFramebuffer_SetNone();

void ovrRenderer_Create(
		XrSession session,
		ovrRenderer* renderer,
		int suggestedEyeTextureWidth,
		int suggestedEyeTextureHeight);
void ovrRenderer_Destroy(ovrRenderer* renderer);