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Asked: 2026-06-01T17:08:06+00:00

I’m trying port a GLSL 4.2 to 1.2 (Because I’m using a mac), however,

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I’m trying port a GLSL 4.2 to 1.2 (Because I’m using a mac), however, I’m not sure how I can convert an out parameter to 1.2 (as it generates an error).

out vec3 vNormal;
out vec2 texcoord; 
out vec3 vPosition;

The compiler error is as following.


Invalid qualifiers 'out' in global variable context
ERROR: 0:13: Invalid qualifiers 'out' in global variable context
ERROR: 0:14: Invalid qualifiers 'out' in global variable context
ERROR: 0:19: Use of undeclared identifier 'texcoord'
ERROR: 0:20: Use of undeclared identifier 'vNormal'
ERROR: 0:21: Use of undeclared identifier 'vPosition'
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1 Answer

  1. Editorial Team

    The GLSL 1.30 and above out qualifier represents a shader stage output. What that means for 1.20 and below depends on which shader stage you’re talking about.

    Since you’re using identifiers like texcoord and vNormal, I’m guessing that you are writing a vertex shader. Then the keyword you should use is varying. Your fragment shader inputs that correspond to these should also be varying too.

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