GLSL shader programming #version header error: unrecognized preprocessing directive

Question

I just started GLSL shader programing, but however I get unrecognized preprocessing directive whenever I put #version directive at the preprocessor directives header stack, though I included all opengl related headers and files within my source file,

Shader:

#version 400
in vec3 Color; 
out vec4 FragColor; 
void main() 
{ 
    FragColor = vec4(Color, 1.0); 
}

how can I fix this issue?

Did you specify which version you're using? Such as #version 150 — TheAmateurProgrammer
– TheAmateurProgrammer, Commented Nov 8, 2012 at 8:31
Post your source code (both glsl and the main application), opengl version and operating system. — Joakim Nohlgård
– Joakim Nohlgård, Commented Nov 8, 2012 at 8:32
As @JoakimGebart said, we can't help without more informations. Did you check your OpenGL version running? — Felix K.
– Felix K., Commented Nov 8, 2012 at 8:39
@TheAmateurProgrammer for sure i specified the version but yet gives the same error!!! — BulBul
– BulBul, Commented Nov 8, 2012 at 8:42
@JoakimGebart well iam stuck at the point where the preprocessor directives are being declared (beginning of coding) my problem is that why #version is not considered as a directive in the first place !!! all of the other directives get highlighted except #version — BulBul
– BulBul, Commented Nov 8, 2012 at 8:45

Felix K. · Accepted Answer · 2012-11-08 09:41:39Z

2

The #version directive must occur in a shader before anything else, except for comments and white space.

Even preprocessor directives are illegal ( NVIDIA accepts it but AMD does not! ). If this doesn't help, give us some more information. E.g. glGetString(GL_VERSION) and glGetString(GL_VENDOR).

Refering to your comments you missunderstand how a shader is compiled. A shader cannot be compiled by a C++ compiler. Put your shader into a text file and load it at runtime, then call the compilation methods of OpenGL.

edited Nov 8, 2012 at 9:41

answered Nov 8, 2012 at 8:43

Felix K.

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9 Comments

BulBul Over a year ago

this also gave me the same error!! is there any specific file regarding shader programs?? forexample i wrote mine in a .cpp file, and if the directive should come before any other directives how does the compiler identifies this as a valid preprocessor directive (since it is GLSL specific directive)

Felix K. Over a year ago

@user1788024 Please not so many !!!'s. Please post your shader, even if you say its simple. Than we can sure that there is no other issue.

BulBul Over a year ago

'#version 400 in vec3 Color; out vec4 FragColor; void main() { FragColor = vec4(Color, 1.0); }'

Felix K. Over a year ago

@user1788024 A shader cannot be compiled by a C++ compiler by default. Shaders must be compiled by OpenGL on request. I gonna add it to my answer.

BulBul Over a year ago

so that is the point, well now things make sense thank you for your time and effort.

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GrimCobra · Accepted Answer · 2017-06-01 12:29:02Z

0

The #version pre-processor command is run at the c++ compile time, glsl is only text based and shouldn't be compiled. If you #include "file" in a header or .cpp in the program it will trigger the compile and error. Therefore don't #include glsl files into you application.

edited Jun 1, 2017 at 12:29

user7605325

answered Jun 1, 2017 at 12:06

GrimCobra

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