//Create a vertex shader

GLuint shader = glCreateShader(GL_VERTEX_SHADER);

// if gl shader object allocation was unsuccessful, stop and send notification

// to error console

if (shader == 0) {

std::cerr<<"Vertex shader creation failed!\n";

}

else {

// save shader id

this->shader = shader;

//Shader sourcecode (default)

this->source = vertexSource;

glShaderSource(shader, 1, &source, NULL);

//Attempt to compile the shader...

glCompileShader(shader);

//get compilation status

GLint * param;

glGetShaderiv(shader, GL_COMPILE_STATUS, param);

// if compilation is unsuccessfull:

if(param) {

//print out log info

char * infoLog = new char[logLength];

glGetShaderInfoLog( shader, logLength - 1, NULL, infoLog );

// copy logLength characters of shader's error log is saved

errorLog += infoLog;

std::cerr<<errorLog;

} else { // compilation is successful

}

}

//create shader program;

GLuint program = glCreateProgram();

this->program = program;