100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
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//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#ifndef COORDSIZE_H
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#define COORDSIZE_H
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#pragma once
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#include "worldsize.h"
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// OVERALL Coordinate Size Limits used in COMMON.C MSG_*BitCoord() Routines (and someday the HUD)
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#define COORD_INTEGER_BITS 14
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#define COORD_FRACTIONAL_BITS 5
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#define COORD_DENOMINATOR (1<<(COORD_FRACTIONAL_BITS))
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#define COORD_RESOLUTION (1.0/(COORD_DENOMINATOR))
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// Special threshold for networking multiplayer origins
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#define COORD_INTEGER_BITS_MP 11
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#define COORD_FRACTIONAL_BITS_MP_LOWPRECISION 3
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#define COORD_DENOMINATOR_LOWPRECISION (1<<(COORD_FRACTIONAL_BITS_MP_LOWPRECISION))
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#define COORD_RESOLUTION_LOWPRECISION (1.0/(COORD_DENOMINATOR_LOWPRECISION))
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#define NORMAL_FRACTIONAL_BITS 11
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#define NORMAL_DENOMINATOR ( (1<<(NORMAL_FRACTIONAL_BITS)) - 1 )
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#define NORMAL_RESOLUTION (1.0/(NORMAL_DENOMINATOR))
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// this is limited by the network fractional bits used for coords
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// because net coords will be only be accurate to 5 bits fractional
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// Standard collision test epsilon
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// 1/32nd inch collision epsilon
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#define DIST_EPSILON (0.03125)
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// Verify that coordsize.h and worldsize.h are consistently defined
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#if (MAX_COORD_INTEGER != (1<<COORD_INTEGER_BITS) )
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#error MAX_COORD_INTEGER does not match COORD_INTEGER_BITS
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#endif
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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// The following are Bit Packing Diagrams for client/server Coordinate BitField Messages
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// "Coordinates" = +/-16384.9375 (21 Bits Max)
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//
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// | IntegerFlagBit:1 | FractionFlagBit:1 | SignBit:1 | IntegerField:14 | FractionPart:4 | Total
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// --------------------------------------------------------------------------------------------------
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// 0 0 - - - 2
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// 0 1 x - xxxx 7
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// 1 0 x xxxxxxxxxxxxx - 17
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// 1 1 x xxxxxxxxxxxxx xxxx 21
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//
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// "Vec3Coordinate" = Up to 3 Coordinates (66 Bits Max)
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//
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// | NonZeroX:1 | NonZeroY:1 | NonZeroZ:1 | 0..3 "Coordinates" | BitField Total
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// -------------------------------------------------------------------------------
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// 0 0 0 - 3
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// 0 0 1 7..21 Bits 10..24
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// 0 1 0 7..21 Bits 10..24
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// 1 0 0 7..21 Bits 10..24
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// 0 1 1 14..42 Bits 17..45
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// 1 1 0 14..42 Bits 17..45
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// 1 0 1 14..42 Bits 17..45
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// 1 1 1 21..63 Bits 24..66
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//
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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// The following are Bit Packing Diagrams for client/server Normal BitField Messages
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// "Normals" = +/-1.0 (12 Bits Total)
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//
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// The only gotcha here is that normalization occurs so that
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// 011111111111 = +1.0 and 1111111111111 = -1.0
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//
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// | SignBit:1 | FractionPart:11 | Total
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// --------------------------------------------------------------------------------------------------
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// 1 xxxxxxxxxxx 12
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//
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// "Vec3Normal" = Up to 3 Coordinates (27 Bits Max)
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//
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// | NonZeroX:1 | NonZeroY:1 | 0..2 "Coordinates" | Z Sign Bit | BitField Total
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// -------------------------------------------------------------------------------
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// 0 0 - x 3
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// 0 1 12 Bits x 14
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// 1 0 12 Bits x 14
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// 1 1 24 Bits x 27
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//
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///////////////////////////////////////////////////////////////////////////////////////////////////////
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#endif // COORDSIZE_H
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