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override mesa openGL versions #319

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override mesa openGL versions #319

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Commits on Jul 22, 2020

  1. override mesa openGL versions 

    add the --forceSL150 flag to ignore the openGL Shader Language version reported by
glxinfo | grep -i "shading language"

this has the same effect as running
MESA_GL_VERSION_OVERRIDE=3.2 MESA_GLSL_VERSION_OVERRIDE=150 OpenHantek

http://www.mesa3d.org/envvars.html

MESA_GL_VERSION_OVERRIDE
changes the value returned by glGetString(GL_VERSION) and possibly the GL API type.
Mesa may not really implement all the features of the given version. (for developers only)

MESA_GLSL_VERSION_OVERRIDE
changes the value returned by glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as "130".
Mesa will not really implement all the features of the given language version if it's higher than what's normally reported. (for developers only)

related issues are #221 and #236
    @milahu
    milahu committed Jul 22, 2020
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