Code:
typedef struct tagPixelFormat
{
tagPixelFormat()
{
ColorDepth = 32;
AlphaDepth = 8;
ZDepth = 24;
StencilDepth = 0;
MultiSample = 0;
FullScreen = false;
}
int ColorDepth, AlphaDepth, ZDepth, StencilDepth, MultiSample;
bool FullScreen;
} tPixelFormat;
static void initEntryPoints(HWND hwnd, const PIXELFORMATDESCRIPTOR &pfd)
{
HDC hdc = GetDC(hwnd);
int nPixelFormat = ChoosePixelFormat(hdc, &pfd);
SetPixelFormat(hdc, nPixelFormat, &pfd);
HGLRC hglrc = wglCreateContext(hdc);
wglMakeCurrent(hdc, hglrc);
// e, iza ovog poziva se nalazi mapiranje svih openGL extenzija, tako da ti treba Delphi ekvivalent.
// Nadam se da framework koji koristis vec obavlja ovaj posao umesto tebe
InitOpenGLExtensions();
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hglrc);
ReleaseDC(hwnd, hdc);
}
#define elementsOf(x) (sizeof(x) / sizeof(x[0]))
static int GetPixelFormat(tPixelFormat& pf)
{
PIXELFORMATDESCRIPTOR pfd = {
sizeof (PIXELFORMATDESCRIPTOR), 1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA, pf.ColorDepth,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
pf.ZDepth, pf.StencilDepth,
0, PFD_MAIN_PLANE, 0, 0, 0, 0
};
WNDCLASS wincl;
wincl.hInstance = g_hInstance;
wincl.lpszClassName = "PFrmt";
wincl.lpfnWndProc = PFWinProc;
wincl.style = 0;
wincl.hIcon = NULL;
wincl.hCursor = NULL;
wincl.lpszMenuName = NULL;
wincl.cbClsExtra = 0;
wincl.cbWndExtra = 0;
wincl.hbrBackground = NULL;
RegisterClass(&wincl);
HWND hwnd = CreateWindow("PFrmt", "PFormat", WS_POPUP | WS_CLIPCHILDREN | WS_CLIPSIBLINGS, 0, 0, 8, 8, HWND_DESKTOP, NULL, g_hInstance, NULL);
initEntryPoints(hwnd, pfd);
HDC hdc = GetDC(hwnd);
int iAttribs[] =
{
WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB,
// WGL_SWAP_METHOD_ARB, WGL_SWAP_EXCHANGE_ARB,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
WGL_RED_BITS_ARB, (pf.ColorDepth > 16)? 8 : 5,
WGL_GREEN_BITS_ARB, (pf.ColorDepth > 16)? 8 : 6,
WGL_BLUE_BITS_ARB, (pf.ColorDepth > 16)? 8 : 5,
WGL_ALPHA_BITS_ARB, (pf.ColorDepth > 16)? 8 : 0,
WGL_DEPTH_BITS_ARB, pf.ZDepth,
WGL_STENCIL_BITS_ARB, pf.StencilDepth,
0
};
int pixelFormats[1024];
int bestFormat = 0;
int bestSamples = 0;
unsigned int nPFormats;
if ( EXTCAPS(WGL_ARB_pixel_format)
&& wglChoosePixelFormatARB(hdc, iAttribs, NULL, elementsOf(pixelFormats), pixelFormats, &nPFormats)
&& nPFormats > 0)
{
int minDiff = 0x7FFFFFFF;
int attrib = WGL_SAMPLES_ARB;
int samples;
// Find a multisample format as close as possible to the requested
for (unsigned int i = 0; i < nPFormats; i++)
{
wglGetPixelFormatAttribivARB(hdc, pixelFormats[i], 0, 1, &attrib, &samples);
int diff = abs(pf.MultiSample - samples);
if (diff < minDiff)
{
minDiff = diff;
bestFormat = i;
bestSamples = samples;
}
}
}
else
{
SendMessage(hwnd, WM_CLOSE, 0, 0);
DestroyWindow(hwnd);
return ChoosePixelFormat(hdc, &pfd);
}
pf.MultiSample = bestSamples;
SendMessage(hwnd, WM_CLOSE, 0, 0);
DestroyWindow(hwnd);
return pixelFormats[bestFormat];
}
Napravi primerak tPixelFormat i popuni zeljene vrednosti. Zatim pozovi gornju func i vratice ti pixelformat koji najvise odgovara trazenom.
Ako bas zelis da izlistas sve AA modove onda malo prepravi funkciju.
Inace, za ovo se koristi WGL_ARB_pixel_format ekstenzija ...
http://oss.sgi.com/projects/og...istry/ARB/wgl_pixel_format.txt
yooyo
edit: uh.. tek sad videh da koristis Delphi... pokusaj da prepravis postojecu funkciju...
[Ovu poruku je menjao yooyo dana 22.07.2006. u 23:19 GMT+1]
OpenGL i antialiasing