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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 1993-1996 by id Software, Inc.
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// Copyright (C) 1998-2000 by DooM Legacy Team.
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// Copyright (C) 1999-2023 by Sonic Team Junior.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file i_time.c
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/// \brief Timing for the system layer.
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#include "i_time.h"
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#include <math.h>
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#include "command.h"
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#include "doomtype.h"
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#include "netcode/d_netcmd.h"
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#include "m_fixed.h"
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#include "i_system.h"
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timestate_t g_time;
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static CV_PossibleValue_t timescale_cons_t[] = {{FRACUNIT/20, "MIN"}, {20*FRACUNIT, "MAX"}, {0, NULL}};
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consvar_t cv_timescale = CVAR_INIT ("timescale", "1.0", CV_NETVAR|CV_CHEAT|CV_FLOAT, timescale_cons_t, NULL);
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static precise_t enterprecise, oldenterprecise;
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static fixed_t entertic, oldentertics;
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static double tictimer;
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tic_t I_GetTime(void)
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{
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return g_time.time;
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}
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void I_InitializeTime(void)
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{
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CV_RegisterVar(&cv_timescale);
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// I_StartupTimer is preserved for potential subsystems that need to setup
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// timing information for I_GetPreciseTime and sleeping
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I_StartupTimer();
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g_time.time = 0;
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g_time.timefrac = 0;
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enterprecise = I_GetPreciseTime();
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oldenterprecise = enterprecise;
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entertic = 0;
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oldentertics = 0;
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tictimer = 0.0;
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}
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void I_UpdateTime(fixed_t timescale)
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{
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double ticratescaled;
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double elapsedseconds;
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tic_t realtics;
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// get real tics
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ticratescaled = (double)TICRATE * FIXED_TO_FLOAT(timescale);
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enterprecise = I_GetPreciseTime();
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elapsedseconds = (double)(enterprecise - oldenterprecise) / I_GetPrecisePrecision();
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tictimer += elapsedseconds;
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while (tictimer > 1.0/ticratescaled)
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{
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entertic += 1;
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tictimer -= 1.0/ticratescaled;
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}
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realtics = entertic - oldentertics;
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oldentertics = entertic;
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oldenterprecise = enterprecise;
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// Update global time state
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g_time.time += realtics;
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{
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double fractional, integral;
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fractional = modf(tictimer * ticratescaled, &integral);
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g_time.timefrac = FLOAT_TO_FIXED(fractional);
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}
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}
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