OpenGL Shader ERROR: 0:1: '' : syntax error #version

Question

I'm using xcode to make a game with OpenGL. I have used GLUT to initialise a window. I have shaders that I wish to implement but when I try to compile them, I get two compile errors in the info log. My shaders look like this:

//FirstShader.vsh
#version 150 core

in vec3 position;

void main()
{
    gl_Position = vec4(position, 1.0);
}

//FirstShader.fsh
#version 150 core

out vec4 fragData;

void main()
{
    fragData = vec4(0.0, 0.0, 1.0, 1.0);
}         

I'm reading the file and compiling it with this code:

GLuint createShaderFromFile(const GLchar *path, GLenum shaderType){
GLuint shaderID = glCreateShader(shaderType);
std::ifstream fin;
fin.open(path);
if(!fin.is_open()){
    fin.close();
    std::cout << "Shader Not Found" << std:: endl;
    return 0;
}
std::string source((std::istreambuf_iterator<GLchar>(fin)),std::istreambuf_iterator<GLchar> ());

fin.close();

const GLchar* shaderSource = source.c_str();


glShaderSource(shaderID, 1, &shaderSource, NULL);

glCompileShader(shaderID);
GLint compileStatus;
glGetShaderiv(shaderID, GL_COMPILE_STATUS, &compileStatus);

if (compileStatus != GL_TRUE) {
    std::cout << "Shader failed to compile" << std::endl;
    GLint infoLoglength;
    glGetShaderiv(shaderID, GL_INFO_LOG_LENGTH, &infoLoglength);
    GLchar* infoLog = new GLchar[infoLoglength + 1];
    glGetShaderInfoLog(shaderID, infoLoglength, NULL, infoLog);
    std::cout << infoLog << std::endl;
    delete infoLog;
    return 0;
}


return shaderID;
}

Im getting these errors:

ERROR: 0:1: '' :  version '150' is not supported
ERROR: 0:1: '' : syntax error #version

My OpenGL version is 2.1 and my glsl version is 1.20. Does anybody know how I can fix this?

Answer 1

You can tell OSX to use a newer version of OpenGL by setting it in your pixel format when you create the context. Here is an example of how to set it up.

Or if you're using glut, I think you want glutInitContextVersion(x, y); where x and y are the major and minor version numbers. GLSL 1.5 is supported in OpenGL 3.2, I think. (And you might also want glutInitContextProfile(GLUT_CORE_PROFILE);, I think.)