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#include <iostream>
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#include <fstream>
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#include <string>
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#include <GL/glew.h>
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#include <GLGraphics/gel_glu.h>
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using namespace std;
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void print_glsl_program_log(GLuint obj)
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{
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	GLint infologLength = 0;
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	glGetProgramiv(obj, GL_INFO_LOG_LENGTH, &infologLength);
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	if (infologLength > 0)
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	{
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		char* infoLog = new char[infologLength];
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		glGetProgramInfoLog(obj, infologLength, 0, infoLog);
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		cout << "InfoLog:\n%s\n\n" << infoLog << endl;
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		delete infoLog;
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	}
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}
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const std::string read_glsl_source(const std::string& path, const std::string& file)
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{
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	string fullpath = path + "/" + file;
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	ifstream is(fullpath.c_str(), ios::binary);
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	string str, contents;
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	while(getline(is,str))
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	{
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		contents += str;
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		contents += "\n";
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	}
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	return contents;
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}
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GLuint create_glsl_shader(GLuint stype, const std::string& src)
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{
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	GLuint S = glCreateShader(stype);
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	const GLchar* src_cstr = src.c_str();
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	glShaderSource(S, 1, &src_cstr, 0);
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	glCompileShader(S);
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	GLint status;
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	glGetShaderiv(S,GL_COMPILE_STATUS, &status);
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	if (status == 0)
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	{
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		GLint infologLength = 0;
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		glGetShaderiv(S, GL_INFO_LOG_LENGTH, &infologLength);
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		if (infologLength > 0)
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		{
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			char* infoLog = new char[infologLength];
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			glGetShaderInfoLog(S, infologLength, 0, infoLog);
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			cout << "InfoLog: " << infoLog << endl;
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			delete infoLog;
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		}
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		return 0;
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	}
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	return S;
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}
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GLuint create_glsl_shader(GLuint stype, const std::string& path, const std::string& file)
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{
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	string str = read_glsl_source(path, file);
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	if(str != "")
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		return create_glsl_shader(stype, str);
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	return 0;
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}
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