From: Benedikt Kessler (bjk++at++munich.sgi.com)
Date: 09/06/2004 02:49:13
Bonjour!
Probably you should replace GL_UNPACK_ALIGNMENT by GL_PACK_ALIGNMENT if the WriteImage function does not accept any gaps between the lines (which I assume due to the memory allocation you're doing).
Also does the size of your viewport (that was probably set byglViewport) match the size you get from your _viewer? Probably you want to use the width/height (and offsets) of your viewport.
Also you don't need the glFinish call.
Bye! Benedikt
Myriam Lajon wrote:
>
> I try to create images from buffer
> I use Performer 3.1.1.
>
> Images created are ok if I do not resize the window. If I do, it's like the
> row size is different from the real size or the first pixel is not at the
> right place! :
>
> --/-----
> -/-----/
> /-----/- (one or two lines cross the image)
>
> Here is my code : (called before or after swap buffer is done, result is the
> same)
> Call at each step:
>
> glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
>
> // window size
> int x = _viewer->GetWidth();
> int y = _viewer->GetHeight();
>
> glPixelStorei(GL_PACK_ROW_LENGTH,x);
>
> int val = 3*(x+1)*(y+1);
> char * pixels = new char[val];
>
> glReadBuffer(GL_FRONT);
> glFinish();
> glReadPixels (0, 0, x, y, GL_RGB, GL_UNSIGNED_BYTE, pixels);
>
> // method call to create image in RGB format
> (*WriteImage)(name,(unsigned char*)pixels,x,y,3);
>
> pixels = 0;
> delete [] pixels;
>
> Thanks for help
> Myriam
>
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