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/**
* @file llworldmipmap.h
* @brief Data storage for the S3 mipmap of the entire world.
*
* $LicenseInfo:firstyear=2003&license=viewergpl$
*
* Copyright (c) 2003-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLWORLDMIPMAP_H
#define LL_LLWORLDMIPMAP_H
#include <map>
#include "llmemory.h" // LLPointer
#include "indra_constants.h" // REGION_WIDTH_UNITS
#include "llregionhandle.h" // to_region_handle()
class LLViewerFetchedTexture;
// LLWorldMipmap : Mipmap handling of all the tiles used to render the world at any resolution.
// This class provides a clean structured access to the hierarchy of tiles stored in the
// Amazon S3 repository and abstracts its directory/file structure.
// The interface of this class though still assumes that the caller knows the general level/tiles
// structure (at least, that it exists...) but doesn't requite the caller to know the details of it.
// IOW, you need to know that rendering levels exists as well as grid coordinates for regions,
// but you can ignore where those tiles are located, how to get them, etc...
// The class API gives you back LLPointer<LLViewerFetchedTexture> per tile.
// See llworldmipmapview.cpp for the implementation of a class who knows how to render an LLWorldMipmap.
// Implementation notes:
// - On the S3 servers, the tiles are rendered in 2 flavors: Objects and Terrain.
// - For the moment, LLWorldMipmap implements access only to the Objects tiles.
class LLWorldMipmap
{
public:
// Parameters of the mipmap
static const S32 MAP_LEVELS = 8; // Number of subresolution levels computed by the mapserver
static const S32 MAP_TILE_SIZE = 256; // Width in pixels of the tiles computed by the mapserver
LLWorldMipmap();
~LLWorldMipmap();
// Clear up the maps and release all image handles
void reset();
// Manage the boost levels between loops (typically draw() loops)
void equalizeBoostLevels();
// Drop the boost levels to none (used when hiding the map)
void dropBoostLevels();
// Get the tile smart pointer, does the loading if necessary
LLPointer<LLViewerFetchedTexture> getObjectsTile(U32 grid_x, U32 grid_y, S32 level, bool load = true);
// Helper functions: those are here as they depend solely on the topology of the mipmap though they don't access it
// Convert sim scale (given in sim width in display pixels) into a mipmap level
static S32 scaleToLevel(F32 scale);
// Convert world coordinates to mipmap grid coordinates at a given level
static void globalToMipmap(F64 global_x, F64 global_y, S32 level, U32* grid_x, U32* grid_y);
private:
// Get a handle (key) from grid coordinates
U64 convertGridToHandle(U32 grid_x, U32 grid_y) { return to_region_handle(grid_x * REGION_WIDTH_UNITS, grid_y * REGION_WIDTH_UNITS); }
// Load the relevant tile from S3
LLPointer<LLViewerFetchedTexture> loadObjectsTile(U32 grid_x, U32 grid_y, S32 level);
// Clear a level from its "missing" tiles
void cleanMissedTilesFromLevel(S32 level);
// The mipmap is organized by resolution level (MAP_LEVELS of them). Each resolution level is an std::map
// using a region_handle as a key and storing a smart pointer to the image as a value.
typedef std::map<U64, LLPointer<LLViewerFetchedTexture> > sublevel_tiles_t;
sublevel_tiles_t mWorldObjectsMipMap[MAP_LEVELS];
// sublevel_tiles_t mWorldTerrainMipMap[MAP_LEVELS];
S32 mCurrentLevel; // The level last accessed by a getObjectsTile()
};
#endif // LL_LLWORLDMIPMAP_H
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