!!!Win32 API から OpenGL の使用例。

{{ref_image opengl_w32.jpg}}
{{ref_image ss.jpg}}
{{ref_image ss2.jpg}}
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*{{ref example_opengl.zip}}

*{{ref demo.zip}}

キー操作：
上下左右：回転

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- main.cpp

 #include <windows.h> 
 #include "util_gl.h"
 
 static HWND hMainWnd;
 
 static LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);
 
 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
 				   LPSTR lpCmdLine, int nCmdShow)
 {
 	// テスト用ウィンドウ作成
 	WNDCLASS wc;
 	ZeroMemory(&wc, sizeof(wc));
 	wc.style         = CS_HREDRAW | CS_VREDRAW;
 	wc.lpfnWndProc   = MainWndProc;
 	wc.cbClsExtra    = 0;
 	wc.cbWndExtra    = 0;
 	wc.hInstance     = hInstance;
 	wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
 	wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
 	wc.hbrBackground = (HBRUSH) GetSysColorBrush(COLOR_3DFACE);
 	wc.lpszMenuName  = NULL;
 	wc.lpszClassName = "MAINWND";
 	if(!RegisterClass(&wc)) return -1;
 	
 	hMainWnd = CreateWindowEx(
 		0, "MAINWND", "OpenGL example.",
 		WS_OVERLAPPED | WS_SYSMENU | WS_VISIBLE | WS_MINIMIZEBOX,
 		CW_USEDEFAULT, CW_USEDEFAULT, 320, 240,
 		NULL, NULL, hInstance, NULL);
 	
 	ShowWindow(hMainWnd, SW_SHOW);
 	UpdateWindow(hMainWnd);	
 	
 	// メッセージループ
 	MSG msg;
 	while(GetMessage(&msg , NULL , 0 , 0) > 0) {
 		DispatchMessage(&msg);
 	}
 	return msg.wParam;
 }
 
 static LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
 {
 	static PAINTSTRUCT ps;
 	static float ang1 = 45.0f;
 	static int timerId;
 	
 	switch(msg){
 	case WM_CREATE:
 		{
 			// タイマーセット
 			timerId = SetTimer(hwnd, 1, 1, NULL);
 		}
 		return 0;
 	case WM_TIMER:
 		{
 			ang1 += 5.0f;
 			if(ang1 > 360.0f) ang1 -= 360.0f;
 			InvalidateRect(hwnd, NULL, TRUE);
 		}
 		return 0;
 	case WM_PAINT:
 		{
 			// 無効リージョンをクリア(BeginPaint()を使用しないため)
 			ValidateRect(hwnd , NULL);
 			// OpenGL描画用のHDCを取得
 			HDC hdc = GetGlDC(hwnd);
 			// ポリゴン描画
 			glRotatef(ang1, 1.0, 1.0, 1.0);
 			glClear(GL_COLOR_BUFFER_BIT);
 			glBegin(GL_POLYGON);
 				glColor3f(1.0, 0.0, 0.0); glVertex2f(-0.8, -0.8);
 				glColor3f(0.0, 1.0, 0.0); glVertex2f( 0.8,  0.8);
 				glColor3f(0.0, 0.0, 1.0); glVertex2f( 0.8, -0.8);
 			glEnd();
 			glFlush();
 			// ダブルバッファ切替
 			SwapBuffers(hdc);
 			// OpenGL描画用のHDCを解放
 			ReleaseGlDC(hwnd, hdc);
 		}
 		return 0;
 	case WM_CLOSE:
 		{
 			// タイマー解除
 			KillTimer(hwnd, timerId);
 			PostQuitMessage(0);
 		}
 		return 0;
 	}
 	return DefWindowProc(hwnd , msg , wp , lp);
 }

- util_gl.h

 #ifndef _UTIL_GL_
 #define _UTIL_GL_
 
 #include <windows.h>
 #include <GL/gl.h>
 
 // OpenGL描画用HDCを取得
 HDC GetGlDC(HWND hwnd);
 
 // OpenGL描画用HDCの解放
 void ReleaseGlDC(HWND hwnd, HDC hdc);
 
 // OpenGL終了処理
 void ExitGl();
 
 #endif
 
- util_gl.cpp

 #include "util_gl.h"
 
 static HGLRC hGLRC = NULL;
 
 // OpenGL描画用HDCを取得
 HDC GetGlDC(HWND hwnd)
 {
 	HDC hdc;
 	int pf;
 	static PIXELFORMATDESCRIPTOR pfd = { 
 		sizeof(PIXELFORMATDESCRIPTOR), 1,
 		PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER ,
 		PFD_TYPE_RGBA,
 		24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0,
 		PFD_MAIN_PLANE, 0, 0, 0, 0}; 
 	
 	hdc = GetDC(hwnd);
 	pf = ChoosePixelFormat(hdc, &pfd);
 	SetPixelFormat(hdc, pf, &pfd);
 	
 	if(hGLRC == NULL) hGLRC = wglCreateContext(hdc);
 	wglMakeCurrent(hdc, hGLRC);
 	
 	return hdc;
 }
 
 // OpenGL描画用HDCの解放
 void ReleaseGlDC(HWND hwnd, HDC hdc)
 {
 	wglMakeCurrent(hdc, 0);
 	ReleaseDC(hwnd, hdc);
 }
 
 // OpenGL終了処理
 void ExitGl()
 {
 	if(!hGLRC) wglDeleteContext(hGLRC);
 }