133 lines
4.0 KiB
C
133 lines
4.0 KiB
C
/**
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* @file llregionhandle.h
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* @brief Routines for converting positions to/from region handles.
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*
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* $LicenseInfo:firstyear=2002&license=viewergpl$
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*
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* Copyright (c) 2002-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLREGIONHANDLE_H
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#define LL_LLREGIONHANDLE_H
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#include "indra_constants.h"
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#include "v3math.h"
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#include "v3dmath.h"
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inline U64 to_region_handle(const U32 x_origin, const U32 y_origin)
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{
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U64 region_handle;
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region_handle = ((U64)x_origin) << 32;
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region_handle |= (U64) y_origin;
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return region_handle;
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}
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inline U64 to_region_handle(const LLVector3d& pos_global)
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{
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U32 global_x = (U32)pos_global.mdV[VX];
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global_x -= global_x % 256;
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U32 global_y = (U32)pos_global.mdV[VY];
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global_y -= global_y % 256;
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return to_region_handle(global_x, global_y);
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}
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inline U64 to_region_handle_global(const F32 x_global, const F32 y_global)
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{
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// Round down to the nearest origin
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U32 x_origin = (U32)x_global;
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x_origin -= x_origin % REGION_WIDTH_U32;
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U32 y_origin = (U32)y_global;
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y_origin -= y_origin % REGION_WIDTH_U32;
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U64 region_handle;
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region_handle = ((U64)x_origin) << 32;
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region_handle |= (U64) y_origin;
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return region_handle;
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}
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inline BOOL to_region_handle(const F32 x_pos, const F32 y_pos, U64 *region_handle)
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{
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U32 x_int, y_int;
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if (x_pos < 0.f)
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{
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// llwarns << "to_region_handle:Clamping negative x position " << x_pos << " to zero!" << llendl;
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return FALSE;
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}
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else
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{
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x_int = (U32)llround(x_pos);
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}
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if (y_pos < 0.f)
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{
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// llwarns << "to_region_handle:Clamping negative y position " << y_pos << " to zero!" << llendl;
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return FALSE;
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}
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else
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{
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y_int = (U32)llround(y_pos);
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}
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*region_handle = to_region_handle(x_int, y_int);
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return TRUE;
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}
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// stuff the word-frame XY location of sim's SouthWest corner in x_pos, y_pos
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inline void from_region_handle(const U64 ®ion_handle, F32 *x_pos, F32 *y_pos)
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{
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*x_pos = (F32)((U32)(region_handle >> 32));
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*y_pos = (F32)((U32)(region_handle & 0xFFFFFFFF));
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}
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// stuff the word-frame XY location of sim's SouthWest corner in x_pos, y_pos
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inline void from_region_handle(const U64 ®ion_handle, U32 *x_pos, U32 *y_pos)
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{
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*x_pos = ((U32)(region_handle >> 32));
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*y_pos = ((U32)(region_handle & 0xFFFFFFFF));
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}
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// return the word-frame XY location of sim's SouthWest corner in LLVector3d
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inline LLVector3d from_region_handle(const U64 ®ion_handle)
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{
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return LLVector3d(((U32)(region_handle >> 32)), (U32)(region_handle & 0xFFFFFFFF), 0.f);
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}
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// grid-based region handle encoding. pass in a grid position
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// (eg: 1000,1000) and this will return the region handle.
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inline U64 grid_to_region_handle(const U32 grid_x, const U32 grid_y)
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{
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return to_region_handle(grid_x * REGION_WIDTH_UNITS,
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grid_y * REGION_WIDTH_UNITS);
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}
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inline void grid_from_region_handle(const U64& region_handle, U32* grid_x, U32* grid_y)
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{
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from_region_handle(region_handle, grid_x, grid_y);
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*grid_x /= REGION_WIDTH_UNITS;
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*grid_y /= REGION_WIDTH_UNITS;
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}
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#endif
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