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Table of Contents
Renderer identification
Introduction
You can identify whether the software or OpenGL renderer is currently being used by using the IsOpenGL function from ACSUtils.
- don't just check
GetCVar(“vid_renderer”)– the user may also havegl_noglset to true. - don't just check for
vid_rendererandgl_nogl– the user may be playing in ZDoom, which doesn't have the OpenGL renderer. - don't just use IsGZDoom and assume that if the engine is GZDoom, the user is playing in OpenGL renderer.
- don't check the renderer serverside – the server has no renderer.
Nonetheless, many badly coded mods do a lot of the above and get incorrect results.
IsOpenGL
bool IsOpenGL() – returns true if the mod is being played in the OpenGL renederer, false if in software renderer.
If called serverside, IsOpenGL logs an error and returns true.
vid_renderer or gl_nogl is changed mid-game because the renderer only actually switches after restart, but the values of the cvars change immediately.
How it works
First, IsOpenGL checks if it's running serverside (see above).
Then IsOpenGL calls IsZDoom to check if it's running in ZDoom. Since ZDoom doesn't have an OpenGL renderer, the renderer is assumed to be software in this case.
Then, IsOpenGL checks for gl_nogl - a CVar that lets the user to disable the OpenGL renderer in GZDoom and Zandronum. If it's set, the renderer is assumed to be software.
And only then IsOpenGL checks for vid_renderer. If its value is not 0, the renderer is assumed to be OpenGL.