/*
   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/render.h"
#include "render/tga.h"
#include "render/gl.h"
#include "core/core.h"
#include "filesystem/filesystem.h"
#include "sys/sys.h"

namespace render {

GLuint textures[32];

core::Cvar *r_radius = 0;
core::Cvar *r_wireframe = 0;
core::Cvar * r_arraysize = 0;

core::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 << "Initializing renderer..." << std::endl;

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

	con_print << "Loading textures..." << std::endl;

	if (!texture( "bitmaps/loader.tga", 0)) {
		con_error << "Essential file bitmaps/loader.tga missing" << std::endl;
		core::application()->shutdown();
	}

	if (!texture("bitmaps/conchars.tga", 1)) {
		con_error << "Essential file bitmaps/conchars.tga missing" << std::endl;
		core::application()->shutdown();
	}

	if (!texture("bitmaps/crosshair.tga", 2)) {
		con_error << "Essential file bitmaps/crosshair.tga missing" << std::endl;
		core::application()->shutdown();
	}

	r_arraysize = core::Cvar::get("r_arraysize", 4.0f * (float) sizeof(float) , core::Cvar::Archive);
	size_t mb = (size_t) r_arraysize->value();
	if (mb < 8)
		mb = 8;
	if (mb > 256)
		mb = 256;
	(*r_arraysize) = (float) mb;
	vertexarray = new core::VertexArray(mb);

	r_radius = core::Cvar::get("r_radius", "0", core::Cvar::Archive);
	r_wireframe = core::Cvar::get("r_wireframe", "0", core::Cvar::Archive);
}

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

	glDeleteTextures(2, textures);

	// 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;
	}

	core::Model::clear();
	delete vertexarray;
	vertexarray = 0;
}

}