// --------------------------------------------------------------------------
//
// Copyright (c) 2003 Thomas D. Marsh. All rights reserved.
//
// "SSC" is free software; you can redistribute it
// and/or use it and/or modify it under the terms of
// the "GNU General Public License" (GPL).
//
// --------------------------------------------------------------------------

#include "graph.h"
#include "draw.h"
#include "hud.h"


GraphicContext::GraphicContext()
{
}

GraphicContext::~GraphicContext()
{
}

extern void initTexture();

void GraphicContext::initGL()
{
	// depth test
	glEnable(GL_DEPTH_TEST);
	glClearDepth(1000);
	glDepthFunc(GL_LESS);

	// perspective calculations
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glShadeModel(GL_SMOOTH);
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

	glClearColor(0.0, 0.0, 0.0, 1.0);

	glFlush();
}


bool GraphicContext::createWindow(char* title, int w, int h, int b, bool fullscreen)
{
	if (SDL_Init(SDL_INIT_VIDEO) < 0)
	{
		fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
		return false;
	}

	HUD::init();


	int flags = SDL_OPENGL;
	if (fullscreen)
		flags |= SDL_FULLSCREEN;
	flags |= SDL_GL_DOUBLEBUFFER;
	flags |= SDL_HWPALETTE;

	const SDL_VideoInfo *videoInfo = SDL_GetVideoInfo();

	if (videoInfo == NULL)
	{
		fprintf(stderr, "Video query failed: %s\n", SDL_GetError());
		SDL_Quit();
		exit(-1);
	}

	if (videoInfo->hw_available)	flags |= SDL_HWSURFACE;
	if (videoInfo->blit_hw)		flags |= SDL_HWACCEL;

	int rs(0),gs(0),bs(0),ds(0);
	if (b == 24)
	{
		rs = gs = bs = 8;
		ds = 16;
	}
	else if (b == 16)
	{
		rs = bs = 5;
		gs = 6;
		ds = 16;
	}
	else
	{
		fprintf(stderr, "Unknow color depth: %d\n", b);
		SDL_Quit();
		exit(-1);
	}

	SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   rs);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, gs);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  bs);
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, ds);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

	SDL_Surface* main_surface = SDL_SetVideoMode(w, h, 0, flags);
	if (main_surface == NULL)
	{
		fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
		SDL_Quit();
		exit(-1);
	}

	initGL();

	resizeScene(w, h);

	return true;
}

void GraphicContext::resizeScene(int w, int h)
{

	if (h == 0)
		h = 1;

	glViewport(0, 0, w, h);
	draw::setupGL();
}

void GraphicContext::closeWindow()
{
	SDL_Quit();
}