glReadPixels
Author
i''m trying to find out what is the equivalence of glReadPixels, glReadBuffer(GL_BACK),and glReadBuffer(GL_FRONT) in Directx?
glReadPixels(0,0,lpbih->biWidth,lpbih->biHeight,GL_BGR_EXT,GL_UNSIGNED_BYTE,bmBits);
i''m trying to conver this line to directx...plss help me!
thnks
.jm.
You''ll have to lock the texture you''re trying to access, and read out the data at the pointer it returns to you, and unlock again.
IDirect3DTexture8::LockRect() I think, or something along those lines. See SDK.
- JQ
Full Speed Games. Coming soon.
IDirect3DTexture8::LockRect() I think, or something along those lines. See SDK.
- JQ
Full Speed Games. Coming soon.
Author
here is the sample code that i have which is in opengl...
what i would like to do is to be able to convert this in directx. suggestions anyone?
you could see the complete code of this at :
http://www.codeproject.com/audio/avigenerator.asp
what i would like to do is to be able to convert this in directx. suggestions anyone?
you could see the complete code of this at :
http://www.codeproject.com/audio/avigenerator.asp
void CMainFrame::OnAvigenerationGenerate() { int i; CAVIGenerator AviGen; LPBITMAPINFOHEADER lpbih; BYTE* bmBits; CGL2AviView* pView=(CGL2AviView*)GetActiveView(); AviGen.SetRate(10); // set 20fps AviGen.SetBitmapHeader(pView); // give info about bitmap AviGen.SetFileName("test.avo"); // retreiving size of image lpbih=AviGen.GetBitmapHeader(); // allocating memory bmBits=new BYTE[lpbih->biSizeImage]; VERIFY(AviGen.InitEngine()); // reading back buffer glReadBuffer(GL_BACK); for(i=0;i<200;i++) { // render frame pView->DrawGL(); // Copy from OpenGL to buffer glReadPixels(0,0,lpbih->biWidth,lpbih->biHeight,GL_BGR_EXT,GL_UNSIGNED_BYTE,bmBits); // send to avi engine AviGen.AddFrame(bmBits); } // releasing engine and memory VERIFY(AviGen.ReleaseEngine()); delete[] bmBits; glReadBuffer(GL_FRONT);}
Are you using D3D 8?
If so, you can get the display backbuffer as a IDirect3DSurface8 by calling IDirect3DDevice8::GetBackBuffer().
You can get the front buffer similarly:
IDirect3DDevice8::GetFrontBuffer
There''s nothing that''s quite the same as glReadPixels, you need to parse the buffer pixel data yourself. Generally you''ll call IDirect3DSurface8::GetDesc to get the data you need from the surface (pixel format, size, pitch, etc) and use that to pull out specific x/y pixel values or regions.
If so, you can get the display backbuffer as a IDirect3DSurface8 by calling IDirect3DDevice8::GetBackBuffer().
You can get the front buffer similarly:
IDirect3DDevice8::GetFrontBuffer
There''s nothing that''s quite the same as glReadPixels, you need to parse the buffer pixel data yourself. Generally you''ll call IDirect3DSurface8::GetDesc to get the data you need from the surface (pixel format, size, pitch, etc) and use that to pull out specific x/y pixel values or regions.
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