Created
October 6, 2012 06:24
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Codeblock OpenGL project sample file
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#include <windows.h> | |
#include <gl/gl.h> | |
LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM); | |
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*); | |
void DisableOpenGL(HWND, HDC, HGLRC); | |
int WINAPI WinMain(HINSTANCE hInstance, | |
HINSTANCE hPrevInstance, | |
LPSTR lpCmdLine, | |
int nCmdShow) | |
{ | |
WNDCLASSEX wcex; | |
HWND hwnd; | |
HDC hDC; | |
HGLRC hRC; | |
MSG msg; | |
BOOL bQuit = FALSE; | |
float theta = 0.0f; | |
/* register window class */ | |
wcex.cbSize = sizeof(WNDCLASSEX); | |
wcex.style = CS_OWNDC; | |
wcex.lpfnWndProc = WindowProc; | |
wcex.cbClsExtra = 0; | |
wcex.cbWndExtra = 0; | |
wcex.hInstance = hInstance; | |
wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION); | |
wcex.hCursor = LoadCursor(NULL, IDC_ARROW); | |
wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); | |
wcex.lpszMenuName = NULL; | |
wcex.lpszClassName = "GLSample"; | |
wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);; | |
if (!RegisterClassEx(&wcex)) | |
return 0; | |
/* create main window */ | |
hwnd = CreateWindowEx(0, | |
"GLSample", | |
"OpenGL Sample", | |
WS_OVERLAPPEDWINDOW, | |
CW_USEDEFAULT, | |
CW_USEDEFAULT, | |
256, | |
256, | |
NULL, | |
NULL, | |
hInstance, | |
NULL); | |
ShowWindow(hwnd, nCmdShow); | |
/* enable OpenGL for the window */ | |
EnableOpenGL(hwnd, &hDC, &hRC); | |
/* program main loop */ | |
while (!bQuit) | |
{ | |
/* check for messages */ | |
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) | |
{ | |
/* handle or dispatch messages */ | |
if (msg.message == WM_QUIT) | |
{ | |
bQuit = TRUE; | |
} | |
else | |
{ | |
TranslateMessage(&msg); | |
DispatchMessage(&msg); | |
} | |
} | |
else | |
{ | |
/* OpenGL animation code goes here */ | |
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); | |
glClear(GL_COLOR_BUFFER_BIT); | |
glPushMatrix(); | |
glRotatef(theta, 0.0f, 0.0f, 1.0f); | |
glBegin(GL_TRIANGLES); | |
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 1.0f); | |
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.87f, -0.5f); | |
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(-0.87f, -0.5f); | |
glEnd(); | |
glPopMatrix(); | |
SwapBuffers(hDC); | |
theta += 1.0f; | |
Sleep (1); | |
} | |
} | |
/* shutdown OpenGL */ | |
DisableOpenGL(hwnd, hDC, hRC); | |
/* destroy the window explicitly */ | |
DestroyWindow(hwnd); | |
return msg.wParam; | |
} | |
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) | |
{ | |
switch (uMsg) | |
{ | |
case WM_CLOSE: | |
PostQuitMessage(0); | |
break; | |
case WM_DESTROY: | |
return 0; | |
case WM_KEYDOWN: | |
{ | |
switch (wParam) | |
{ | |
case VK_ESCAPE: | |
PostQuitMessage(0); | |
break; | |
} | |
} | |
break; | |
default: | |
return DefWindowProc(hwnd, uMsg, wParam, lParam); | |
} | |
return 0; | |
} | |
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC) | |
{ | |
PIXELFORMATDESCRIPTOR pfd; | |
int iFormat; | |
/* get the device context (DC) */ | |
*hDC = GetDC(hwnd); | |
/* set the pixel format for the DC */ | |
ZeroMemory(&pfd, sizeof(pfd)); | |
pfd.nSize = sizeof(pfd); | |
pfd.nVersion = 1; | |
pfd.dwFlags = PFD_DRAW_TO_WINDOW | | |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; | |
pfd.iPixelType = PFD_TYPE_RGBA; | |
pfd.cColorBits = 24; | |
pfd.cDepthBits = 16; | |
pfd.iLayerType = PFD_MAIN_PLANE; | |
iFormat = ChoosePixelFormat(*hDC, &pfd); | |
SetPixelFormat(*hDC, iFormat, &pfd); | |
/* create and enable the render context (RC) */ | |
*hRC = wglCreateContext(*hDC); | |
wglMakeCurrent(*hDC, *hRC); | |
} | |
void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC) | |
{ | |
wglMakeCurrent(NULL, NULL); | |
wglDeleteContext(hRC); | |
ReleaseDC(hwnd, hDC); | |
} | |
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