gl_Position is not accessible in this profile?

Question

When trying to compile GLSL shaders in C/C++ using GLFW/GLEW I get the following error:

0(12) : error C5052: gl_Position is not accessible in this profile

I followed a tutorial from learnopengl.com. The code runs and displays a empty while square with the above error message being printed to the command line. Any ideas what is happening and how I might fix it?

The fragment shader is:

#version 410 

layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aColor;
layout (location = 2) in vec2 aTexCoord;

out vec3 ourColor;
out vec2 TexCoord;

void main()
{
    gl_Position = vec4(aPos, 1.0);
    ourColor = aColor;
    TexCoord = aTexCoord;
}

And the vertex shader is:

#version 410 

out vec4 FragColor;

in vec3 ourColor;
in vec2 TexCoord;

uniform sampler2D ourTexture;

void main()
{
    FragColor = texture(ourTexture, TexCoord);
}

If you would like to see the rest of the code please refer to the tutorial link above.

Miquelmiquela

The first code block should be the vertex shader, the second one the fragment shader. If this is not just a typo in the question, then this is probably the reason for the error message (there is no gl_Position in a fragment shader). – Lauretta

While this is indeed a "stupid mistake", the error message "gl_Position is not accessible in this profile" turns out to be very indicative of this (rather common) beginner-level mishap. The answer saved me a lot of time, too. The upvote count on the answer also show that this closed question has helped many people. I thus vote to reopen this question. – Struggle

Answer 1

Looks like you tried to load the fragment shader as the vertex shader and vice versa. gl_Position can only be set from within the vertex shader, since it's a per-vertex attribute. Loading the shaders in correct order should get rid of that problem though.

Principe

Thank you. A simple error that I never noticed. – Miquelmiquela

One reason to abolish "closed" - I had this exact problem, and this question lead me straight to the solution. – Tiresome

If you are loading your shaders from a file, make sure you load the correct shader too. I tried to load a fragment shader from my vertex shader file and ended up here :D – Handstand

I don't even use C/C++ yet still had the same problem. Thank you! – Creep