ogmg/main.cpp

#include "ggl.h"
#include "scene.h"
#include "utils.h"
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "winmm.lib")

POINT originalPos;//�����Ҽ�������ʱ��λ��
bool rotateView = false;


unsigned char* LoadFileContent(const char* path, int &filesize) {
	unsigned char* fileContent = nullptr;
	filesize = 0;

	FILE *pFile = fopen(path, "rb");

	if (pFile) {
		fseek(pFile, 0, SEEK_END);//���ļ�ָ���ƶ����ļ�ĩβ
		int nLen = ftell(pFile);//�ļ�λ��ָ�뵱ǰλ���������ļ��׵�ƫ���ֽ�����������ʵ���ǵõ����ļ����ֽڳ���
		if (nLen > 0) {
			rewind(pFile);//���ļ�ָ���Ƶ�ͷ��
			fileContent = new unsigned char[nLen + 1];
			fread(fileContent, sizeof(unsigned char), nLen, pFile);
			fileContent[nLen] = '\0';
			filesize = nLen;
		}
		fclose(pFile);
	}
	return fileContent;
}

/**
* ��ȡÿ֡������ʱ��
*/
float GetFrameTime() {
	static unsigned long lastTime = 0, timeSinceComputerStart = 0;
	timeSinceComputerStart = timeGetTime();
	unsigned long frameTime = lastTime == 0 ? 0 : timeSinceComputerStart - lastTime;
	lastTime = timeSinceComputerStart;
	return float(frameTime) / 1000.0f;
}

/**
* @hwnd ������Ϣ�Ĵ���
* @msg ��Ϣ����
*/
LRESULT CALLBACK GLWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
	switch (msg) {
	case WM_RBUTTONDOWN:
		GetCursorPos(&originalPos);//��ȡ����λ��
		ShowCursor(false);//��������
		rotateView = true;
		return 0;
	case WM_RBUTTONUP:
		SetCursorPos(originalPos.x, originalPos.y);
		ShowCursor(true);
		rotateView = false;
		return 0;
	case WM_MOUSEMOVE:
		if (rotateView) {
			POINT currentPos;
			GetCursorPos(&currentPos);//��һ�λ�ȡ���굱ǰλ��
			int deltaX = currentPos.x - originalPos.x;
			int deltaY = currentPos.y - originalPos.y;
			OnMouseMove(deltaX, deltaY);
			SetCursorPos(originalPos.x, originalPos.y);
		}
		return 0;
	case WM_KEYDOWN:
		OnKeyDown(wParam);
		return 0;
	case WM_KEYUP:
		OnKeyUp(wParam);
		return 0;
	case WM_CLOSE:
		PostQuitMessage(0);
		return 0;
	}

	return DefWindowProc(hwnd, msg, wParam, lParam);//������Ϣ����windowĬ�ϴ�������
}

/**
* @hinstance ��Ӧ�ó�������ʵ��
* @hPrevInstance ��һ��Ӧ�ó�ʽ��ʵ��
* @IpCmdLine �����еIJ���
* @ShowCmd ��ô��ʾ����
*/
INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR IpCmdLine, int ShowCmd) {

	/*ע�ᴰ��*/
	WNDCLASSEX wndclass;
	wndclass.cbClsExtra = 0; //�������͵Ķ����ռ䣬���ﲻ��Ҫ
	wndclass.cbSize = sizeof(WNDCLASSEX); //����ʵ��ռ�õ��ڴ�
	wndclass.cbWndExtra = 0; //���ڵĶ����ռ䣬���ﲻ��Ҫ
	wndclass.hbrBackground = NULL; //���ڱ���
	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); //������������
	wndclass.hIcon = NULL; //Ӧ�ó���exe�ļ���ʾͼ��
	wndclass.hIconSm = NULL; //Ӧ�ó�������ʱ���Ͻ�ͼ��
	wndclass.hInstance = hinstance; //��Ӧ�ó���ʵ��
	wndclass.lpfnWndProc = GLWindowProc; //�����û������˴��ڣ��������ᱻ����
	wndclass.lpszClassName = L"GLWindow";//��������
	wndclass.lpszMenuName = NULL;//�˵�����
	wndclass.style = CS_VREDRAW | CS_HREDRAW;//���ڸ���ʱ���ػ淽ʽ������ʹ�ô�ֱ�ػ���ˮƽ�ػ�
	ATOM atom = RegisterClassEx(&wndclass);
	if (!atom) {
		MessageBox(NULL, L"Register failed", L"Error", MB_OK);
		return  0;
	}


	/*��������*/
	//�������ڴ�С
	RECT rect;
	rect.left = 0;
	rect.right = 800;
	rect.top = 0;
	rect.bottom = 600;
	AdjustWindowRect(&rect, WS_EX_OVERLAPPEDWINDOW, NULL);
	int windowWidth = rect.right - rect.left;
	int windowHeight = rect.bottom - rect.top;

	//��������һ��Ҫ�͸ղ�ע�ᴰ�ڵı���һ��
	HWND hwnd = CreateWindowEx(NULL, L"GLWindow", L"OpenGL Window", WS_OVERLAPPEDWINDOW, 100, 100, windowWidth, windowHeight, NULL, NULL, hinstance, NULL);
	
	//������Ⱦ����
	HDC dc = GetDC(hwnd);//��ȡ�豸������
	PIXELFORMATDESCRIPTOR pfd;
	memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
	pfd.nVersion = 1;
	pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
	pfd.cColorBits = 32; //��ɫ������ÿ������Ϊ32����4ͨ��RGBA
	pfd.cDepthBits = 24; //���Ȼ�����ÿ�����ش�С��24���ر�ʾһ��������
	pfd.cStencilBits = 8; //�ɰ建����ÿ����Ϊ8����
	pfd.iPixelType = PFD_TYPE_RGBA; //������������ΪRGBA
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER ; //��ʾ������������������
	//�������ظ�ʽ
	int pixelFormat = ChoosePixelFormat(dc, &pfd);
	SetPixelFormat(dc, pixelFormat, &pfd);
	//����OpenGL��Ⱦ����
	HGLRC rc = wglCreateContext(dc);
	wglMakeCurrent(dc, rc);//����OpenGL��Ⱦ������Ч

	Init();

	/*��ʾ����*/
	ShowWindow(hwnd, SW_SHOW);
	UpdateWindow(hwnd);

	/*�����������û�����*/
	MSG msg;
	while (true) {
		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
			if (msg.message == WM_QUIT) {
				break;
			}
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}

		Draw();
		SwapBuffers(dc);
	}

	return 0;
}