#include "SDL.h"

#include <Windows.h>
#include <GL/glew.h>
#include <sstream>
#include <string>
using std::stringstream;
using std::string;

GLsizei windowWidth = 1600;
GLsizei windowHeight = 900;
bool fullScreen = false;
bool useAA = true;

const Uint8 *keys = NULL;

int main(int argc, char **argv)
{
if ( SDL_Init(SDL_INIT_VIDEO) < 0 )
	{
		fprintf(stderr, "Unable to initialize SDL %s", SDL_GetError());
		exit(1);
	}


	if (useAA )
	{
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
		SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 8);
	}


	Uint32 flags;
	if(fullScreen)
	{
		flags = SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN;
	}
	else
		flags = SDL_WINDOW_OPENGL;

	SDL_Window* the_window;
	the_window = SDL_CreateWindow("testing", 90, 60, windowWidth, windowHeight, flags);
	if ( !the_window )
	{
		fprintf(stderr, "Unable to create OpenGL Scene: %s", SDL_GetError());
		exit(2);
	}

	SDL_GLContext glcontext = SDL_GL_CreateContext(the_window);

	glewExperimental = GL_TRUE;
	if (glewInit() != GLEW_OK)
	{
		MessageBox(0, "Failed to initialize GLEW", "Error", MB_OK);
		return -1;
	}

	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,SDL_GL_CONTEXT_PROFILE_CORE);
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);

	int maj;
	int min;
	SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,&maj);
    	SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,&min);
	stringstream strstrm (stringstream::in | stringstream::out);
	strstrm << "gl major version: " << maj << "\ngl minor version: " << min;
	string the_msg = strstrm.str();
	MessageBox(0, the_msg.c_str(), "current opengl version", MB_OK);
	
	glMatrixMode(GL_PROJECTION|GL_MODELVIEW);
	glLoadIdentity();
	glOrtho(-320,320,240,-240,0,1);
 

	float x = 0.0, y = 30.0;
	
	int done = 0;
	SDL_Event event;
	while ( !done )
	{
		while ( SDL_PollEvent(&event) )
		{
			if ( event.type == SDL_QUIT )
				done = -1;

			keys = SDL_GetKeyboardState(NULL);
			
		}

		float frameTime;
		float curTime = SDL_GetTicks();
		static float lastTime = 0;

		frameTime = curTime - lastTime;

		glClearColor(0,0,0,1);
		glClear(GL_COLOR_BUFFER_BIT);
		glRotatef(0.09*(frameTime),0.0,0.0,1.0);

		glBegin(GL_TRIANGLES);
		 glColor3f(1.0,0.0,0.0); glVertex2f(x, y+90.0);
		 glColor3f(0.0,1.0,0.0); glVertex2f(x+90.0, y-90.0);
		 glColor3f(0.0,0.0,1.0); glVertex2f(x-90.0, y-90.0);
		glEnd();
    
		SDL_GL_SwapWindow(the_window);


		if ( keys[SDL_SCANCODE_ESCAPE] )
		{
			done = 1;
		}

		lastTime = curTime;
	}

	SDL_Quit();

	return 1;
}