/** * @file llworldmipmap.h * @brief Data storage for the S3 mipmap of the entire world. * * $LicenseInfo:firstyear=2003&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #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