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/**
* @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
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