How can i render things in OpenGL, but direct the rendering to a seperate image instead of to the buffer/screen? I want to use regular 32-bit image data.
Render to bitmap
Started by ironfroggy, Jun 28 2001 06:29 AM
4 replies to this topic
Ad:
#2 Members - Reputation: 122
Posted 28 June 2001 - 06:55 AM
It''s really simple... but you HAVE to render to your frame buffer, just because that is the way OGL works. But to quickly awnser your question, you use glReadPixels and get the data from your frame buffer and then save that to a bitmap. Their is an example of this in the book "OpenGL Game Programming" (a pretty good book), you get get some source (not quite sure if it will have the screen capture though) from glbook.gamedev.net chapter 7
CodeSmith the Pixel Pusher
CodeSmith the Pixel Pusher
#4 Anonymous Poster_Anonymous Poster_* Guests - Reputation:
Posted 28 June 2001 - 02:26 PM
pbuffers are an nVidia specific extension
#5 Members - Reputation: 122
Posted 28 June 2001 - 03:23 PM
Came accross this link that may be of use
http://romka.demonews.com/opengl/demos/win32_eng.htm
look for OpenGL Bitmap...
it states:
Demo, which demonstrates OpenGL rendering to bitmap,
very usefull for all people, who is needed in offscreen rendering, for example when You want to do Your OpenGL output flow to AVI file or printer
I havn''t had a chance to try it yet, but it sounds handy
http://romka.demonews.com/opengl/demos/win32_eng.htm
look for OpenGL Bitmap...
it states:
Demo, which demonstrates OpenGL rendering to bitmap,
very usefull for all people, who is needed in offscreen rendering, for example when You want to do Your OpenGL output flow to AVI file or printer
I havn''t had a chance to try it yet, but it sounds handy
