/*
   render/render.cc
   This file is part of the Osirion project and is distributed under 
   the terms of the GNU General Public License version 2 
*/

#include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>

#include "render/gl.h"
#include "render/dust.h"
#include "render/textures.h"
#include "render/tga.h"
#include "render/render.h"
#include "model/model.h"

#include "core/core.h"
#include "filesystem/filesystem.h"
#include "sys/sys.h"

namespace render {

GLuint textures[32];

core::Cvar *r_arraysize = 0;
core::Cvar *r_bbox = 0;
core::Cvar *r_grid = 0;
core::Cvar *r_radius = 0;
core::Cvar *r_sky = 0;
core::Cvar *r_wireframe = 0;

using model::VertexArray;

VertexArray *vertexarray = 0;

bool texture(const char *filename, size_t id)
{
	Image *image = TGA::load(filename);
	if (!image)
		return false;

	glGenTextures(1, &textures[id]);
	glBindTexture(GL_TEXTURE_2D, textures[id]);

	int texture_type;
	if (image->channels() == 4)
		texture_type = GL_RGBA;
	else
		texture_type = GL_RGB;

	gluBuild2DMipmaps(GL_TEXTURE_2D, image->channels(),
		image->width(), image->height(), texture_type, GL_UNSIGNED_BYTE, image->data());

	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR_MIPMAP_LINEAR);	
	
	return true;
}

void init() 
{
	con_print << "^BInitializing renderer..." << std::endl;

	con_print << "  renderer   ^B" << gl::renderer() << std::endl;
	con_print << "  vendor     ^B" << gl::vendor() << std::endl;
	con_print << "  version    ^B" << gl::version() << std::endl;

	// size of the vertex array in megabytes
	r_arraysize = core::Cvar::get("r_arraysize", 0.0f , core::Cvar::Archive);
	r_arraysize->set_info("[int] size of the vertex array in Mb");

	size_t mb = (size_t) r_arraysize->value();
	if (mb < 4 * sizeof(float))
		mb = 4 * sizeof(float);
	if (mb > 256)
		mb = 256;
	(*r_arraysize) = (float) mb;
	vertexarray = new VertexArray(mb);

	r_radius = core::Cvar::get("r_radius", "0", core::Cvar::Archive);
	r_radius->set_info("[bool] render entity radius");

	r_wireframe = core::Cvar::get("r_wireframe", "0", core::Cvar::Archive);
	r_wireframe->set_info("[bool] render wireframe");

	r_grid = core::Cvar::get("r_grid", "1", core::Cvar::Archive);
	r_grid->set_info("[bool] render the space grid");

	r_bbox = core::Cvar::get("r_bbox", "0", core::Cvar::Archive);
	r_bbox->set_info("[bool] render model bounding box");

	r_sky = core::Cvar::get("r_sky", "1", core::Cvar::Archive);
	r_sky->set_info("[bool] render the sky globe");

	Camera::init();

	Textures::init();

	Text::init();

	Dust::init();
}

void shutdown()
{
	con_print << "^BShutting down renderer..." << std::endl;

	// clear entity models, this will force a reload
	for (std::map<unsigned int, core::Entity *>::iterator it=core::Entity::registry.begin(); it != core::Entity::registry.end(); it++) {
		core::Entity *entity = (*it).second;
		if (entity->model())
			entity->entity_model = 0;
	}

	// clear models
	model::Model::clear();

	// clear vertex array
	delete vertexarray;
	vertexarray = 0;

	Text::shutdown();

	Textures::shutdown();

	Camera::shutdown();

	Dust::shutdown();
}

}