I want to use more then one opengl rendering context at once.
But it does not seem to work.
Only the last one rendered is updated. The first one does not update.
The idea i want is a preview window for a mesh before inserting a new mesh into the scene. Without a preview window everything goes ok. But i cannot get back the rendering context anymore. All rendering goes to the preview window, even after it is closed down.

Has anyone ever used more than one opengl rendering context at once?

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http://3das.noeska.com - create adventure games without programming

Using more than one rendering context in the same app shouldn't make any bigger problems if you keep some things in mind.You most likely need two device contexts and two render contexts (two coherrent DC/RC-pairs) and your code should looke something like this :



That should work,and don't forget to call wglShareLists(RC1, RC2) if you want to use the same textures and displaylists in both contexts.

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www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

thanks. I have a look at that angle. I use a opengl class so my idea is that i already use different dc and rc for different instances of that class. But maybe not.

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http://3das.noeska.com - create adventure games without programming

Also keep in mind that a template for this situation exists on our page. Have a look at the templates

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"Light travels faster than sound. This is why some people appear bright, before you can hear them speak..."

does the template use a tcustompanel class? I have a look again at the templates.
Also i solved the problem. I forgot to add wglMakeCurrent (dc, hrc); i used it when creating the panel. But when focus has changed to another glpanel i need to call it again.

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http://3das.noeska.com - create adventure games without programming

the type of "window" that is used for rendering is nearly unimportant as long as it has some kind of handle the rc can get use

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"Light travels faster than sound. This is why some people appear bright, before you can hear them speak..."

i know, i have been optimizing to much.

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http://3das.noeska.com - create adventure games without programming