llworldmipmap.h
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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) 2003-2010, 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