At the moment I’m working on a project wich draws thumpnails via OpenGL. I’m using glDrawPixels to draw the thumpnails and it works quite nice, but whenever I try to draw a thumpnail which lays partly outside the view, it won’t show up.
So for example, if the thumpnail is 100 pixels width and I draw it at x-positon -50 so that only the half of the image is visible, it won’t show up.
I’m using glRasterPos2d to set the current drawing position.
Does anyone know a way around this problem?
I can’t use textures, because of the power of 2 limitation and because of the thumpnails changing themselves from time to time. (weird project
You can get around this by first setting a valid rasterPos inside your current viewport and then using glBitmap to set a rasterPos that is outside the viewport but still valid.
To do this call glBitmap with a NULL bitmap and then modify the current raster position using the xmove & ymove parameters.
Yes, Errin, you are right. It is the correct behavior of glRasterPos() it’s just that I tryed to find a way around this limitation.
So thanks Ledge, because your way works really good. It helped a lot.
I have wrote I nice glRasterPosHack() function, which calls glRasterPos with a valid position and change it afterwards with glBitmap.
