?? wgl應(yīng)用.cpp
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glDisable(GL_FOG);
}
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//update transformations
if(mode==MoveObject)
{
glPushMatrix();
glLoadIdentity();
glRotatef(angle,axis[0],axis[1],axis[2]);
glMultMatrixf((GLfloat*)objectXform);
glGetFloatv(GL_MODELVIEW_MATRIX,(GLfloat*)objectXform);
glPopMatrix();
}
if(textureEnabled)glEnable(GL_TEXTURE_2D);
if(drawOutlines)glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
#if defined(GL_SGI_cull_vertex)
if(useVertexCull)
glEnable(GL_CULL_VERTEX_SGI);
#endif
if(useFaceCull)
glEnable(GL_CULL_FACE);
if(useLighting)
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
glPushMatrix();
glTranslatef(xOffset,yOffset,0.0F);
glMultMatrixf((GLfloat*)objectXform);
(*drawObject[objectIndex])();
glPopMatrix();
glDisable(GL_TEXTURE_2D);
glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
#if defined(GL_SGI_cull_vertex)
glDisable(GL_CULL_VERTEX_SGI);
#endif
glDisable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glFlush();
SwapBuffers(hDC);
}
void idleredraw(void)
{
if(!redrawContinue)idleFunc=NULL;
doRedraw();
}
void redraw(void)
{
if(!idleFunc)
idleFunc=idleredraw;
}
BOOL trackingMotion=FALSE;
float lastPos[3];
DWORD lastTime;
int startX,startY;
void ptov(int x,int y,int width,int height,float v[3])
{
float d,a;
//project x,y onto a hemi-sphere centered within width,height
v[0]=(2.0F*x-width)/width;
v[1]=(height-2.0F*y)/height;
d=(float)sqrt(v[0]*v[0]+v[1]*v[1]);
v[2]=(float)cos((M_PI/2.0F)*((d<1.0F)?d:1.0F));
a=1.0F/(float)sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]);
v[0]*=a;
v[1]*=a;
v[2]*=a;
}
void startMotion(DWORD time,int button,int x,int y)
{
if(button==1)mode=MoveObject;
else return;
trackingMotion=TRUE;
redrawContinue=FALSE;
startX=x;
startY=y;
ASSERT(startY);
ptov(x,y,winWidth,winHeight,lastPos);
}
void stopMotion(DWORD time,int button,int x,int y)
{
if(button==1&&mode==MoveObject)trackingMotion=FALSE;
else return;
if(startX!=x||startY!=y)redrawContinue=TRUE;
else
{
angle=0.0F;
redrawContinue=FALSE;
}
if(!redrawContinue)mode=MoveNone;
redraw();
}
void trackMotion(DWORD time,int x,int y)
{
if(trackingMotion)
{
float curPos[3],dx,dy,dz;
ptov(x,y,winWidth,winHeight,curPos);
dx=curPos[0]-lastPos[0];
dy=curPos[1]-lastPos[1];
dz=curPos[2]-lastPos[2];
angle=90.0F*(float)sqrt(dx*dx+dy*dy+dz*dz);
axis[0]=lastPos[1]*curPos[2]-lastPos[2]*curPos[1];
axis[1]=lastPos[2]*curPos[0]-lastPos[0]*curPos[2];
axis[2]=lastPos[0]*curPos[1]-lastPos[1]*curPos[0];
lastPos[0]=curPos[0];
lastPos[1]=curPos[1];
lastPos[2]=curPos[2];
redraw();
}
}
void setupPalette(HDC hDC)
{
PIXELFORMATDESCRIPTOR pfd;
LOGPALETTE *pPal;
int pixelFormat=GetPixelFormat(hDC);
int paletteSize;
DescribePixelFormat(hDC,pixelFormat,sizeof(PIXELFORMATDESCRIPTOR),&pfd);
if(!(pfd.dwFlags &PFD_NEED_PALETTE||pfd.iPixelType==PFD_TYPE_COLORINDEX))
{
return;
}
paletteSize=1 << pfd.cColorBits;
pPal=(LOGPALETTE*)
malloc(sizeof(LOGPALETTE)+paletteSize*sizeof(PALETTEENTRY));
pPal->palVersion=0x300;
pPal->palNumEntries=paletteSize;
//start with a copy of the curent system palette
(void)GetSystemPaletteEntries(hDC,0,paletteSize,&pPal->palPalEntry[0]);
{
//fill in an RGBA color palette
int redMask=(1 << pfd.cRedBits)-1;
int greenMask=(1 << pfd.cGreenBits)-1;
int blueMask=(1 << pfd.cBlueBits)-1;
int i;
for(i=0;i<paletteSize;++i)
{
pPal->palPalEntry[i].peRed=(((i>>pfd.cRedShift)&redMask)*255)/redMask;
pPal->palPalEntry[i].peGreen=(((i>>pfd.cGreenShift)&greenMask)*255)/greenMask;
pPal->palPalEntry[i].peBlue=(((i>>pfd.cBlueShift)&blueMask)*255)/blueMask;
pPal->palPalEntry[i].peFlags=0;
}
}
hPalette=CreatePalette(pPal);
free(pPal);
if(hPalette)
{
SelectPalette(hDC,hPalette,FALSE);
RealizePalette(hDC);
}
}
void setupPixelformat(HDC hDC)
{
PIXELFORMATDESCRIPTOR pfd=
{
sizeof(PIXELFORMATDESCRIPTOR), //size of this pfd
1, //version num
PFD_DRAW_TO_WINDOW| //support window
PFD_SUPPORT_OPENGL, //support OpenGL
PFD_TYPE_RGBA, //color type
8, //8-bit color depth
0,0,0,0,0,0, //color bits(ignored)
0, //no alpha buffer
0, //alpha bits(ignored)
0, //no accumulation buffer
0,0,0,0, //accum bits(ignored)
0, //depth buffer(filled below)
0, //no stencil buffer
0, //no auxiliary buffer
PFD_MAIN_PLANE, //main layer
0, //reserved
0,0,0, //no layer,visible,damage masks
};
int SelectedPixelFormat;
BOOL retVal;
if(doubleBuffered)pfd.dwFlags|=PFD_DOUBLEBUFFER;
if(depthBuffered)pfd.cDepthBits=16;
SelectedPixelFormat=ChoosePixelFormat(hDC,&pfd);
if(SelectedPixelFormat==0)
{
MessageBox(WindowFromDC(hDC),"ChoosePixelFormat failed\n","Error",
MB_ICONERROR|MB_OK);
exit(1);
}
retVal=SetPixelFormat(hDC,SelectedPixelFormat,&pfd);
if(retVal!=TRUE)
{
MessageBox(WindowFromDC(hDC),"SetPixelFormat failed\n","Error",
MB_ICONERROR|MB_OK);
exit(1);
}
}
LRESULT APIENTRY WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
hDC=GetDC(hWnd);
setupPixelformat(hDC);
setupPalette(hDC);
hGLRC=wglCreateContext(hDC);
wglMakeCurrent(hDC,hGLRC);
init();
return 0;
case WM_DESTROY:
if(hGLRC)
{
wglMakeCurrent(NULL,NULL);
wglDeleteContext(hGLRC);
}
idleFunc=NULL;
ReleaseDC(hWnd,hDC);
PostQuitMessage(0);
return 0;
case WM_SIZE:
if(hGLRC)
{
winWidth=(int)LOWORD(lParam);
winHeight=(int)HIWORD(lParam);
resize();
return 0;
}
case WM_PALETTECHANGED:
if(hPalette!=NULL&&(HWND)wParam!=hWnd)
{
UnrealizeObject(hPalette);
SelectPalette(hDC,hPalette,FALSE);
RealizePalette(hDC);
redraw();
return 0;
}
break;
case WM_QUERYNEWPALETTE:
if(hPalette!=NULL)
{
UnrealizeObject(hPalette);
SelectPalette(hDC,hPalette,FALSE);
RealizePalette(hDC);
redraw();
return TRUE;
}
case WM_PAINT:
if(hGLRC)
{
PAINTSTRUCT ps;
BeginPaint(hWnd,&ps);
redraw();
EndPaint(hWnd,&ps);
return 0;
}
break;
case WM_LBUTTONDOWN:
if(hGLRC)
{
int x=((int)LOWORD(lParam) << 16) >> 16;
int y=((int)HIWORD(lParam) << 16) >> 16;
SetCapture(hWnd);
startMotion(0,1,x,y);
return 0;
}
break;
case WM_LBUTTONUP:
if(hGLRC)
{
int x=((int)LOWORD(lParam) << 16) >> 16;
int y=((int)HIWORD(lParam) << 16) >> 16;
ReleaseCapture();
stopMotion(0,1,x,y);
return 0;
}
break;
case WM_MOUSEMOVE:
if(hGLRC)
{
int x=((int)LOWORD(lParam) << 16) >> 16;
int y=((int)HIWORD(lParam) << 16) >> 16;
trackMotion(0,x,y);
break;
}
case WM_CHAR:
switch((int)wParam)
{
case VK_ESCAPE:
DestroyWindow(hWnd);
return 0;
case VK_SPACE:
objectIndex=objectIndex<NUM_OBJECTS-1?++objectIndex:0;
redraw();
return 0;
case 'a':
useVertexArray=!useVertexArray;
redraw();
return 0;
case 'c':
useFaceCull=!useFaceCull;
redraw();
return 0;
case 'f':
useFog=!useFog;
redraw();
return 0;
case 'h':
halfObject=!halfObject;
redraw();
return 0;
case 'l':
useLighting=!useLighting;
redraw();
return 0;
case 'o':
perspectiveProj=!perspectiveProj;
redraw();
return 0;
case 'p':
drawOutlines=!drawOutlines;
redraw();
return 0;
case 'v':
useVertexCull=!useVertexCull;
redraw();
return 0;
case 'i':
yOffset +=Y_OFFSET_STEP;
redraw();
return 0;
case 'j':
xOffset -=X_OFFSET_STEP;
redraw();
return 0;
case 'k':
xOffset +=X_OFFSET_STEP;;
redraw();
return 0;
case 'm':
yOffset -=Y_OFFSET_STEP;;
redraw();
return 0;
case 'r':
textureReplace=!textureReplace;
redraw();
return 0;
case 't':
textureEnabled=!textureEnabled;
redraw();
return 0;
case 'x':
useVertexLocking=!useVertexLocking;
redraw();
return 0;
default:
break;
}
break;
case WM_KEYDOWN:
switch((int)wParam)
{
case VK_DOWN:
--objectNumMajor;
redraw();
break;
case VK_UP:
++objectNumMajor;
redraw();
break;
case VK_LEFT:
--objectNumMinor;
redraw();
break;
case VK_RIGHT:
++objectNumMinor;
redraw();
break;
default:
break;
}
if(hGLRC)
redraw();
return 0;
default:
break;
}
//Deal with any unprocessed messages
long k=DefWindowProc(hWnd,message,wParam,lParam);
ASSERT(k);
return DefWindowProc(hWnd,message,wParam,lParam);
}
int APIENTRY WinMain(HINSTANCE hCurrentInst,HINSTANCE hPreviousInst,
PSTR lpszCmdLine, int nCmdShow)
{
static TCHAR szAppName[] = TEXT ("OpenGL") ;
WNDCLASS wndClass;
HWND hWnd;
MSG msg;
//Define and register the window class
wndClass.style=CS_HREDRAW|CS_VREDRAW;
wndClass.lpfnWndProc=WndProc;
wndClass.cbClsExtra=0;
wndClass.cbWndExtra=sizeof(LPVOID);
//ASSERT(hCurrentInst);
wndClass.hInstance=hCurrentInst;
wndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndClass.hbrBackground=(HBRUSH) GetStockObject(WHITE_BRUSH);
wndClass.lpszMenuName=NULL;
wndClass.lpszClassName=szAppName;
if (!RegisterClass (&wndClass))
{
MessageBox (NULL, TEXT ("Program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
winWidth=GetSystemMetrics(SM_CYSCREEN)/3;
winHeight=GetSystemMetrics(SM_CYSCREEN)/3;
hWnd=CreateWindow(
szAppName,TEXT ("WGL 應(yīng)用"),
WS_OVERLAPPEDWINDOW,
winX,winY,winWidth,winHeight,NULL,NULL,hCurrentInst,NULL);
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
while(1)
{
while(idleFunc&&
PeekMessage(&msg,NULL,0,0,PM_NOREMOVE)==FALSE)
{
(*idleFunc)();
}
if(GetMessage(&msg,NULL,0,0)!=TRUE)break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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