Following the shader program setup tutorial at http://www.arcsynthesis.org/gltut/Basics/Tut01%20Making%20Shaders.html

I received the following error in my console window:

By this error, I assume that the program locates and reads the .vs and .fs files from the appropriate directory, so that can't be the problem.

My calls that creates each shader are as follows:

void InitializeProgram()
{
    std::vector<GLuint> shaderList;
 
    shaderList.push_back(CreateShader(GL_VERTEX_SHADER, "shader"));
    shaderList.push_back(CreateShader(GL_FRAGMENT_SHADER, "shader"));
 
    shaderOne = CreateProgram(shaderList);
    std::for_each(shaderList.begin(), shaderList.end(), glDeleteShader);
}

shader.vs

void main()

{

    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

}

shader.fs

void main()

{ 

    gl_FragColor = vec4(1.0,0.0,0.0,0.0);

}

Also, I thought there might be a problem with having the file extension .vs instead of .vert, but neither work.

Oh, I'm pretty sure I know exactly what you mean. I think google let me down by not leading me to that thread with my same error. Is there a function that will parse my .txt shader files and put them in a std::string?

Sorry, my concept of the word "parsing" was wrong, and i'll know not to use it, again. Thanks

Yeah, I'll write a basic function to extract the contents on my own. I'm sure it will look a lot nicer than explicitly writing it as an argument:

shaderList.push_back(CreateShader(GL_VERTEX_SHADER, "varying vec4 v; void main() { v = gl_Color; gl_Position = gl_ModelViewProjectionMatrix *gl_Vertex; }"));

Haha, thanks again!

One last question,

The function I wrote for reading .txt contents into a string is not working properly:

std::string readFiletoString(string fileName){
 
    std:string str;
    ifstream infile;
    infile.open(fileName);
 
 
    while(!infile.eof()) // To get you all the lines.
    {
        getline(infile,str); 
 
        // Saves the line in STRING.
        cout<<str; 
 
        // Prints our STRING.
    }
    infile.close();
    cout << str << endl;
    cout << "void main(){ gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;}" << endl;
 
 
    if (str=="void main(){ gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;}"){
        cout << "true" << endl;
    }else{
        cout << "false" << endl;
    }
 
 
    return str;
}

Somehow my function to read the same contents as opposed to manually writing it out is different, and gives me a shader error as a result:

Your change works perfectly, thanks again!