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Diffstat (limited to 'indra/newview/llworldmipmap.h')
| -rw-r--r-- | indra/newview/llworldmipmap.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/indra/newview/llworldmipmap.h b/indra/newview/llworldmipmap.h new file mode 100644 index 0000000000..963aac1403 --- /dev/null +++ b/indra/newview/llworldmipmap.h @@ -0,0 +1,94 @@ +/** + * @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 |