How do I do this DDRAW operation in OpenGL?

Jiroh · 2004-11-09T01:05:59

I have this: IDirectDrawSurface7 * DXC_ddraw::pCreateOffScreenSurface(WORD wSzX, WORD wSzY) { DDSURFACEDESC2 ddsd; IDirectDrawSurface7 * pdds4; ZeroMemory(&ddsd, sizeof(ddsd)); if ((wSzX % 4) != 0) wSzX += 4 - (wSzX % 4); ddsd.dwSize = sizeof(ddsd); ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT |DDSD_WIDTH; ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_SYSTEMMEMORY; ddsd.dwWidth = (DWORD)wSzX; ddsd.dwHeight = (DWORD)wSzY; if (m_lpDD4->CreateSurface(&ddsd, &pdds4, NULL) != DD_OK) return NULL; return pdds4; } As you can see, I created a plain buffer in DirectDraw. How would I go about doing this in OpenGL? Another question...I'm pretty sure OpenGL lets me do this more easily, but here we go. void DXC_ddraw::ChangeDisplayMode(HWND hWnd) { HRESULT ddVal; DDSURFACEDESC2 ddsd; if (m_lpBackB4flip != NULL) { m_lpBackB4flip->Release(); m_lpBackB4flip = NULL; } if (m_lpBackB4 != NULL) m_lpBackB4->Release(); if (m_lpFrontB4 != NULL) m_lpFrontB4->Release(); if (m_lpDD4 != NULL) { if (m_bFullMode == TRUE) m_lpDD4->RestoreDisplayMode(); } if( m_bFullMode == TRUE ) { int cx = GetSystemMetrics(SM_CXFULLSCREEN); int cy = GetSystemMetrics(SM_CYFULLSCREEN); ddVal = m_lpDD4->SetCooperativeLevel(hWnd, DDSCL_NORMAL); if (ddVal != DD_OK) return; cx = cx/2; cy = cy/2; if(cy>280) cy -= 40; SetWindowPos( hWnd, NULL, cx-320, cy-240, 640, 480, SWP_SHOWWINDOW); // Create Front Buffer memset( (VOID *)&ddsd, 0, sizeof(ddsd) ); ddsd.dwSize = sizeof( ddsd ); ddsd.dwFlags = DDSD_CAPS; //ddsd.dwBackBufferCount = 0; ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE; ddVal = m_lpDD4->CreateSurface(&ddsd, &m_lpFrontB4, NULL); if (ddVal != DD_OK) return; SetRect(&m_rcFlipping, cx-320, cy-240, cx+320, cy+240); // our fictitious sprite bitmap is... m_bFullMode = FALSE; } else { DDSCAPS2 ddscaps; // Full Screen Mode ddVal = m_lpDD4->SetCooperativeLevel(hWnd, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN); if (ddVal != DD_OK) return; ddVal = m_lpDD4->SetDisplayMode(640, 480, 16,0,0); if (ddVal != DD_OK) return; //Create Front Buffer memset( (VOID *)&ddsd, 0, sizeof(ddsd) ); ddsd.dwSize = sizeof( ddsd ); ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT; ddsd.dwBackBufferCount = 1;//2; //v1.3 ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP | DDSCAPS_COMPLEX; ddVal = m_lpDD4->CreateSurface(&ddsd, &m_lpFrontB4, NULL); if (ddVal != DD_OK) return; // Learned from: // http://www.gamedev.net/reference/articles/article608.asp ZeroMemory(&ddscaps, sizeof(ddscaps)); ddscaps.dwCaps = DDSCAPS_BACKBUFFER; ddVal = m_lpFrontB4->GetAttachedSurface(&ddscaps, &m_lpBackB4flip); if (ddVal != DD_OK) return; SetRect(&m_rcFlipping, 0, 0, 640, 480); // our fictitious sprite bitmap is... m_bFullMode = TRUE; } InitFlipToGDI(hWnd); // Create Back Buffer m_lpBackB4 = pCreateOffScreenSurface(640, 480); if (m_lpBackB4 == NULL) return; // Pre-draw background surface create buffer m_lpPDBGS = pCreateOffScreenSurface(640+32, 480+32); if (m_lpPDBGS == NULL) return; // Getting the back buffer's address and pitch ddsd.dwSize = sizeof(ddsd); if (m_lpBackB4->Lock(NULL, &ddsd, DDLOCK_WAIT, NULL) != DD_OK) return; m_pBackB4Addr = (WORD *)ddsd.lpSurface; m_sBackB4Pitch = (short)ddsd.lPitch >> 1; m_lpBackB4->Unlock(NULL); } Please, how would this DDRAW code be like in OpenGL? Like if I were porting the whole thing to OpenGL.

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Started by Jiroh November 06, 2004 05:14 PM

10 comments, last by vichollis 20 years, 3 months ago

Jiroh

Author

124

November 08, 2004 08:56 PM

Hi, Vic, got it, thanks.

vichollis

122

November 09, 2004 01:05 AM

np. let me know if anything needs clearing up.

- Cheers

How do I do this DDRAW operation in OpenGL?

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How do I do this DDRAW operation in OpenGL?

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