Error when using NVEmulate :-/

[Linuxhippy]

Hi there,

Because I would like to play a bit with shaders on my GF460Go powered laptop I decided to give NVEmulate a try - just to see how/wether it works.

However when using NVEmulate, the engine I am using bails out with a strange error:

org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
at org.lwjgl.opengl.Display.swapBuffers(Display.java: 567)
at org.lwjgl.opengl.Display.update(Display.java:583)
at com.jme.renderer.lwjgl.LWJGLRenderer.displayBackBu ffer(Unknown Source)
at com.jme.app.BaseGame.start(Unknown Source)
at Terrain.main(Terrain.java:40)

lg Clemens

[Thunderbird]

I'm not sure what the old NVEmulate option for the xconfig file / the old environment variables still do. The NV-CONTROL api which is supported by nvidia-settngs and nvclock can set nvemulate aswell. Though nvidia-settings doesn't support it. You can use beta2 of nvclock (commandline version) to enable it aswell. It can be set to multiple values from geforce3(nv20)/geforce4(nv25) to geforcefx(nv30).

[Linuxhippy]

How exactly an this be archieved?

I tried it with:
ce@cehost:~/nvclock0.8b2> src/nvclock -nvemulate nv30
ce@cehost:~/nvclock0.8b2> src/nvclock -nvemulate=nv30


However still the game engine I am playing with reports at startup:
18.08.2006 11:04:29 com.jme.scene.state.lwjgl.LWJGLShaderObjectsState checkProgramError
SCHWERWIEGEND: null

lg Clemens

[Thunderbird]

nvclock -l shows the nvcontrol options it supports. It should mention nvemulate in it aswell. Then using nvclock -q nvemulate you can ask what values are supported. The option can be enabled using nvemulate: nvclock -a nvemulate=30

Note that no matter what option you use for enabling nvemulate, check if the opengl renderer string has changed (check glxinfo for it).

[Linuxhippy]

Thanks for the explanation, yes you're right "nvemulate" is listed as option and can be set and queried. When I set it to 30, nvclock tells me it is 30 when I do nclick -q nvemulate.

However my engine still does not work and the renderer string did not change either:

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce4 488 Go/AGP/SSE2
OpenGL version string: 1.5.6 NVIDIA 87.62

lg Clemens

[Linuxhippy]

I tried it on my "legacy" system which has a FX5200 built-in and there my demo works "perfectly". It seems nvemulate isn't working correctly :-/

Does anybody have a GF4MX card running and could also try wether it works or not - maybe its a bug in current drivers, could that be?

Thanks, lg Clemens

[AaronP]

NVEmulate isn't really supported any more, I'm afraid. You could try an older driver.