#include "tool.h"
#include "define.h"
#include <cassert>
#include <iostream>
#include <fstream>

bool Tool::LoadTextFile(const std::string& filename, std::string& buffer)
{
    std::ifstream f(filename.c_str(), std::ios::binary);
    if(!f.is_open())
        return false;

    f.seekg(0, std::ios::end);
    unsigned int len = f.tellg();
    f.seekg(0, std::ios::beg);

    char* tmp = new char[len + 1];

    f.read(tmp, len);
    f.close();

    tmp[len] = 0;
    buffer = tmp;
    delete [] tmp;

    return true;
}

void Tool::CheckGLError(const char* file, int line)
{
    GLuint err = glGetError();
    if (err != GL_NO_ERROR)	
    {
        std::cerr << "Opengl error before " << file << "[" << line << "]:" << std::hex << err << "(";

        switch(err)
        {
            case GL_INVALID_ENUM:
                std::cerr << "GL_INVALID_ENUM";
                break;
            case GL_INVALID_VALUE:
                std::cerr << "GL_INVALID_VALUE";
                break;
            case GL_INVALID_OPERATION:
                std::cerr << "GL_INVALID_OPERATION";
                break;
            case GL_STACK_OVERFLOW:
                std::cerr << "GL_STACK_OVERFLOW";
                break;
            case GL_STACK_UNDERFLOW:
                std::cerr << "GL_STACK_UNDERFLOW";
                break;
            case GL_OUT_OF_MEMORY:
                std::cerr << "GL_OUT_OF_MEMORY";
                break;
            case GL_TABLE_TOO_LARGE:
                std::cerr << "GL_TABLE_TOO_LARGE";
                break;
            default:
                std::cerr << "unknown";
        }
        std::cerr << ")" << std::endl;
        std::cerr << "ATTENTION: this error might come from anywhere in the code since the previous call to CHECK_GL_ERROR" << std::endl;
        exit(1);
    }
}