97 lines
4.3 KiB
C++
97 lines
4.3 KiB
C++
/**
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* @file llworldmipmap.h
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* @brief Data storage for the S3 mipmap of the entire world.
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*
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* $LicenseInfo:firstyear=2003&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LLWORLDMIPMAP_H
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#define LL_LLWORLDMIPMAP_H
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#include <map>
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#include "llmemory.h" // LLPointer
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#include "indra_constants.h" // REGION_WIDTH_UNITS
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#include "llregionhandle.h" // to_region_handle()
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class LLViewerFetchedTexture;
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// LLWorldMipmap : Mipmap handling of all the tiles used to render the world at any resolution.
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// This class provides a clean structured access to the hierarchy of tiles stored in the
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// Amazon S3 repository and abstracts its directory/file structure.
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// The interface of this class though still assumes that the caller knows the general level/tiles
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// structure (at least, that it exists...) but doesn't requite the caller to know the details of it.
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// IOW, you need to know that rendering levels exists as well as grid coordinates for regions,
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// but you can ignore where those tiles are located, how to get them, etc...
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// The class API gives you back LLPointer<LLViewerFetchedTexture> per tile.
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// See llworldmipmapview.cpp for the implementation of a class who knows how to render an LLWorldMipmap.
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// Implementation notes:
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// - On the S3 servers, the tiles are rendered in 2 flavors: Objects and Terrain.
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// - For the moment, LLWorldMipmap implements access only to the Objects tiles.
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class LLWorldMipmap
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{
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public:
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// Parameters of the mipmap
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static const S32 MAP_LEVELS = 8; // Number of subresolution levels computed by the mapserver
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static const S32 MAP_TILE_SIZE = 256; // Width in pixels of the tiles computed by the mapserver
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LLWorldMipmap();
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~LLWorldMipmap();
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// Clear up the maps and release all image handles
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void reset();
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// Manage the boost levels between loops (typically draw() loops)
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void equalizeBoostLevels();
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// Drop the boost levels to none (used when hiding the map)
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void dropBoostLevels();
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// Get the tile smart pointer, does the loading if necessary
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LLPointer<LLViewerFetchedTexture> getObjectsTile(U32 grid_x, U32 grid_y, S32 level, bool load = true);
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// Helper functions: those are here as they depend solely on the topology of the mipmap though they don't access it
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// Convert sim scale (given in sim width in display pixels) into a mipmap level
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static S32 scaleToLevel(F32 scale);
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// Convert world coordinates to mipmap grid coordinates at a given level
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static void globalToMipmap(F64 global_x, F64 global_y, S32 level, U32* grid_x, U32* grid_y);
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// Load the relevant tile from S3
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static LLPointer<LLViewerFetchedTexture> loadObjectsTile(U32 grid_x, U32 grid_y, S32 level);
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private:
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// Get a handle (key) from grid coordinates
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U64 convertGridToHandle(U32 grid_x, U32 grid_y) { return to_region_handle(grid_x * REGION_WIDTH_UNITS, grid_y * REGION_WIDTH_UNITS); }
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// Clear a level from its "missing" tiles
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void cleanMissedTilesFromLevel(S32 level);
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// The mipmap is organized by resolution level (MAP_LEVELS of them). Each resolution level is an std::map
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// using a region_handle as a key and storing a smart pointer to the image as a value.
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typedef std::map<U64, LLPointer<LLViewerFetchedTexture> > sublevel_tiles_t;
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sublevel_tiles_t mWorldObjectsMipMap[MAP_LEVELS];
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// sublevel_tiles_t mWorldTerrainMipMap[MAP_LEVELS];
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S32 mCurrentLevel; // The level last accessed by a getObjectsTile()
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};
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#endif // LL_LLWORLDMIPMAP_H
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