src/tile.cpp


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/*
Minetest-c55
Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "tile.h"
#include "debug.h"
#include "main.h" // for g_settings
#include "filesys.h"
#include "utility.h"
#include "settings.h"
#include "mesh.h"
#include <ICameraSceneNode.h>
#include "log.h"
#include "mapnode.h" // For texture atlas making
#include "nodedef.h" // For texture atlas making
#include "gamedef.h"
#include "utility_string.h"

/*
	A cache from texture name to texture path
*/
MutexedMap<std::string, std::string> g_texturename_to_path_cache;

/*
	Replaces the filename extension.
	eg:
		std::string image = "a/image.png"
		replace_ext(image, "jpg")
		-> image = "a/image.jpg"
	Returns true on success.
*/
static bool replace_ext(std::string &path, const char *ext)
{
	if(ext == NULL)
		return false;
	// Find place of last dot, fail if \ or / found.
	s32 last_dot_i = -1;
	for(s32 i=path.size()-1; i>=0; i--)
	{
		if(path[i] == '.')
		{
			last_dot_i = i;
			break;
		}
		
		if(path[i] == '\\' || path[i] == '/')
			break;
	}
	// If not found, return an empty string
	if(last_dot_i == -1)
		return false;
	// Else make the new path
	path = path.substr(0, last_dot_i+1) + ext;
	return true;
}

/*
	Find out the full path of an image by trying different filename
	extensions.

	If failed, return "".
*/
static std::string getImagePath(std::string path)
{
	// A NULL-ended list of possible image extensions
	const char *extensions[] = {
		"png", "jpg", "bmp", "tga",
		"pcx", "ppm", "psd", "wal", "rgb",
		NULL
	};
	// If there is no extension, add one
	if(removeStringEnd(path, extensions) == "")
		path = path + ".png";
	// Check paths until something is found to exist
	const char **ext = extensions;
	do{
		bool r = replace_ext(path, *ext);
		if(r == false)
			return "";
		if(fs::PathExists(path))
			return path;
	}
	while((++ext) != NULL);
	
	return "";
}

/*
	Gets the path to a texture by first checking if the texture exists
	in texture_path and if not, using the data path.

	Checks all supported extensions by replacing the original extension.

	If not found, returns "".

	Utilizes a thread-safe cache.
*/
std::string getTexturePath(const std::string &filename)
{
	std::string fullpath = "";
	/*
		Check from cache
	*/
	bool incache = g_texturename_to_path_cache.get(filename, &fullpath);
	if(incache)
		return fullpath;
	
	/*
		Check from texture_path
	*/
	std::string texture_path = g_settings->get("texture_path");
	if(texture_path != "")
	{
		std::string testpath = texture_path + DIR_DELIM + filename;
		// Check all filename extensions. Returns "" if not found.
		fullpath = getImagePath(testpath);
	}
	
	/*
		Check from default data directory
	*/
	if(fullpath == "")
	{
		std::string base_path = porting::path_share + DIR_DELIM + "textures"
				+ DIR_DELIM + "base" + DIR_DELIM + "pack";
		std::string testpath = base_path + DIR_DELIM + filename;
		// Check all filename extensions. Returns "" if not found.
		fullpath = getImagePath(testpath);
	}
	
	// Add to cache (also an empty result is cached)
	g_texturename_to_path_cache.set(filename, fullpath);
	
	// Finally return it
	return fullpath;
}

/*
	An internal variant of AtlasPointer with more data.
	(well, more like a wrapper)
*/

struct SourceAtlasPointer
{
	std::string name;
	AtlasPointer a;
	video::IImage *atlas_img; // The source image of the atlas
	// Integer variants of position and size
	v2s32 intpos;
	v2u32 intsize;

	SourceAtlasPointer(
			const std::string &name_,
			AtlasPointer a_=AtlasPointer(0, NULL),
			video::IImage *atlas_img_=NULL,
			v2s32 intpos_=v2s32(0,0),
			v2u32 intsize_=v2u32(0,0)
		):
		name(name_),
		a(a_),
		atlas_img(atlas_img_),
		intpos(intpos_),
		intsize(intsize_)
	{
	}
};

/*
	SourceImageCache: A cache used for storing source images.
*/

class SourceImageCache
{
public:
	void insert(const std::string &name, video::IImage *img,
			bool prefer_local, video::IVideoDriver *driver)
	{
		assert(img);
		// Remove old image
		core::map<std::string, video::IImage*>::Node *n;
		n = m_images.find(name);
		if(n){
			video::IImage *oldimg = n->getValue();
			if(oldimg)
				oldimg->drop();
		}
		// Try to use local texture instead if asked to
		if(prefer_local){
			std::string path = getTexturePath(name.c_str());
			if(path != ""){
				video::IImage *img2 = driver->createImageFromFile(path.c_str());
				if(img2){
					m_images[name] = img2;
					return;
				}
			}
		}
		img->grab();
		m_images[name] = img;
	}
	video::IImage* get(const std::string &name)
	{
		core::map<std::string, video::IImage*>::Node *n;
		n = m_images.find(name);
		if(n)
			return n->getValue();
		return NULL;
	}
	// Primarily fetches from cache, secondarily tries to read from filesystem
	video::IImage* getOrLoad(const std::string &name, IrrlichtDevice *device)
	{
		core::map<std::string, video::IImage*>::Node *n;
		n = m_images.find(name);
		if(n){
			n->getValue()->grab(); // Grab for caller
			return n->getValue();
		}
		video::IVideoDriver* driver = device->getVideoDriver();
		std::string path = getTexturePath(name.c_str());
		if(path == ""){