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 <ICameraSceneNode.h>
#include "log.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
	};

	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 testpath = porting::getDataPath(filename.c_str());
		// 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;
}

/*
	TextureSource
*/

TextureSource::TextureSource(IrrlichtDevice *device):
		m_device(device),
		m_main_atlas_image(NULL),
		m_main_atlas_texture(NULL)
{
	assert(m_device);
	
	m_atlaspointer_cache_mutex.Init();
	
	m_main_thread = get_current_thread_id();
	
	// Add a NULL AtlasPointer as the first index, named ""
	m_atlaspointer_cache.push_back(SourceAtlasPointer(""));
	m_name_to_id[""] = 0;

	// Build main texture atlas
	if(g_settings->getBool("enable_texture_atlas"))
		buildMainAtlas();
	else
		infostream<<"Not building texture atlas."<<std::endl;
}

TextureSource::~TextureSource()
{
}

void TextureSource::processQueue()
{
	/*
		Fetch textures
	*/
	if(m_get_texture_queue.size() > 0)
	{
		GetRequest<std::string, u32, u8, u8>
				request = m_get_texture_queue.pop();

		infostream<<"TextureSource::processQueue(): "
				<<"got texture request with "
				<<"name=\""<<request.key<<"\""
				<<std::endl;

		GetResult<std::string, u32, u8, u8>
				result;
		result.key = request.key;