Initialisation problem. (Code inc.)
Author
Hi.
I have got a framework that opens up a Window, however, when I try to draw anything to it, be it lines or a polygon, the window stays blank, nothing shows. Below is my code (C++):
#include
#include
#include
#include
#include
#include
#include
#define WINDOWS_CLASS_NAME "WINCLASS1"
#define WIN32_LEAN_AND_MEAN
HWND main_windows_handle = NULL;
int Game_Init(void);
int Game_Shutdown(void);
int Game_Main(void);
LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
switch(msg)
{
case WM_CREATE:
{
return 0; //20
} break;
case WM_PAINT:
{
hdc = BeginPaint(hwnd, &ps);
EndPaint(hwnd, &ps);
return 0;
} break;
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
} break;
default : break;
}
return (DefWindowProc(hwnd, msg, wParam, lParam));
}
int WINAPI WinMain (HINSTANCE hinstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine, // 40
int nCmdShow)
{
WNDCLASS winclass;
HWND hwnd;
MSG msg;
winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc = WindowProc;
winclass.cbClsExtra = 0;
winclass.cbWndExtra = 0;
winclass.hInstance = hinstance;
winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName = WINDOWS_CLASS_NAME;
//60
if(!(RegisterClass(&winclass)))
return 0;
if(!(hwnd = CreateWindow(WINDOWS_CLASS_NAME,
"Dominic Mulligan :: GLWINDOW",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
0, 0, 320, 240, NULL, NULL, hinstance,
NULL)))
return 0;
main_windows_handle = hwnd;
Game_Init();
while(true)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
if(msg.message == WM_QUIT) break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
Game_Main();
}
Game_Shutdown();
return (msg.wParam);
}
int Game_Init(void)
{
glViewport(0, 0, 320, 240);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, 320 / 240, 0.1, 100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glShadeModel(GL_SMOOTH);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
return 1;
}
int Game_Shutdown(void)
{
PostQuitMessage(0);
return 1;
}
int Game_Main(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(0.0, 1.0, 3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
glBegin(GL_TRIANGLES);
glColor3f(0.0, 1.0, 0.0);
glVertex3f(0.0, 0.0, 1.0);
glColor3f(0.0, 0.0, 1.0);
glVertex3f(1.0, 0.0, -1.0);
glColor3f(1.0, 0.0, 0.0);
glVertex3f(0.5, 1.0, 1.0);
glEnd();
return 1;
}
I cannot personally see a problem with it, perhaps you can?
Thanks in advance for any suggestions.
+MDI
Author
Hmm, my include files did not copy for some reason.
Here they are:
#include iostream
#include windows.h
#include windowsx.h
#include math.h
#include gl/gl.h
#include gl/glu.h
#include gl/glaux.h
*EDIT : Damned triangular bracket html things.
+MDI
Edited by - MDI on November 14, 2001 8:18:19 AM
Here they are:
#include iostream
#include windows.h
#include windowsx.h
#include math.h
#include gl/gl.h
#include gl/glu.h
#include gl/glaux.h
*EDIT : Damned triangular bracket html things.
+MDI
Edited by - MDI on November 14, 2001 8:18:19 AM
Here's a basic framework I use for OpenGL window creation
Edited by - Shag on November 14, 2001 3:17:26 PM
HINSTANCE hInstance;HWND hWnd;HDC hDC;HGLRC hRC; int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { hInstance = hInst; wndRegisterClass(); wndChangeDisplayMode(1024, 768, 32); hWnd = wndCreateWindow(1024, 768); hDC = GetDC(hWnd); wndSetPixelFormat(1024, 768, 32, 24, 8); //game init while(MessageHandler() == true) { //main game loop } //game shutdown wndDestroyWindow(); return 0;} LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam){ switch(msg) { case WM_DESTROY: PostQuitMessage(0); return false; break; case WM_SYSCOMMAND: switch(lParam) { case SC_SCREENSAVE: case SC_MONITORPOWER: default: break; } break; case WM_CLOSE: PostQuitMessage(0); return false; break; case WM_SIZE: //ResizeGLScene(LOWORD(lparam),HIWORD(lparam)); return false; break; default:break; } return DefWindowProc(hWnd, msg, wParam, lParam);} bool MessageHandler(void){ MSG msg; while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); if(msg.message == WM_QUIT) { return false; } } return true;} unsigned short wndRegisterClass(void){ WNDCLASS wndClass; wndClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wndClass.lpfnWndProc = (WNDPROC) WndProc; wndClass.cbClsExtra = 0; wndClass.cbWndExtra = 0; wndClass.hInstance = hInstance; wndClass.hIcon = LoadIcon(NULL, IDI_WINLOGO); wndClass.hCursor = LoadCursor(NULL, IDC_ARROW); wndClass.hbrBackground = NULL; wndClass.lpszMenuName = NULL; wndClass.lpszClassName = "Game"; return RegisterClass(&wndClass);} bool wndChangeDisplayMode(long Width, long Height, long ColorBits){ DEVMODE dmScreenSettings; ZeroMemory (&dmScreenSettings, sizeof(dmScreenSettings)); dmScreenSettings.dmSize = sizeof(dmScreenSettings); dmScreenSettings.dmPelsWidth = Width; dmScreenSettings.dmPelsHeight = Height; dmScreenSettings.dmBitsPerPel = ColorBits; dmScreenSettings.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT; return (ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL);} HWND wndCreateWindow(long Width, long Height){ DWORD dwExStyle; DWORD dwStyle; RECT WindowRect; dwExStyle = WS_EX_APPWINDOW; dwStyle = WS_POPUP; ShowCursor(FALSE); AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); return CreateWindowEx(dwExStyle, "Game", "Game", dwStyle | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, 0, 0, Width, Height, NULL, NULL, hInstance, NULL);} void wndSetPixelFormat(long Width, long Height, char ColorBits, char DepthBits, char StencilBits){ PIXELFORMATDESCRIPTOR pfd; 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 = ColorBits; pfd.cRedBits = 0; pfd.cRedShift = 0; pfd.cGreenBits = 0; pfd.cGreenShift = 0; pfd.cBlueBits = 0; pfd.cBlueShift = 0; pfd.cAlphaBits = 0; pfd.cAlphaShift = 0; pfd.cAccumBits = 0; pfd.cAccumRedBits = 0; pfd.cAccumGreenBits = 0; pfd.cAccumBlueBits = 0; pfd.cAccumAlphaBits = 0; pfd.cDepthBits = DepthBits; pfd.cStencilBits = StencilBits; pfd.cAuxBuffers = 0; pfd.iLayerType = PFD_MAIN_PLANE; pfd.bReserved = 0; pfd.dwLayerMask = 0; pfd.dwVisibleMask = 0; pfd.dwDamageMask = 0; int PixelFormat = ChoosePixelFormat(hDC, &pfd); SetPixelFormat(hDC,PixelFormat, &pfd); hRC = wglCreateContext(hDC); wglMakeCurrent(hDC,hRC); ShowWindow(hWnd, SW_SHOW); SetForegroundWindow(hWnd); SetFocus(hWnd); ReSizeGLScene(Width, Height); glClearColor(0.0f, 0.0f, 0.5f, 0.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); SwapBuffers(hDC);} void wndDestroyWindow(void){ ChangeDisplaySettings(NULL, 0); ShowCursor(TRUE); wglMakeCurrent(NULL, NULL); wglDeleteContext(hRC); hRC = NULL; ReleaseDC(hWnd, hDC); hDC = NULL; DestroyWindow(hWnd); hWnd=NULL; UnregisterClass("OpenGL", hInstance); hInstance = NULL;} Edited by - Shag on November 14, 2001 3:17:26 PM
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