ref: bb1058e35c0007828dfeab3d82cf375b0f15d6af
dir: /src/hexen/p_lights.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 1993-2008 Raven Software
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
#include "h2def.h"
#include "m_random.h"
#include "p_local.h"
//============================================================================
//
// T_Light
//
//============================================================================
void T_Light(light_t * light)
{
if (light->count)
{
light->count--;
return;
}
switch (light->type)
{
case LITE_FADE:
light->sector->lightlevel =
((light->sector->lightlevel << FRACBITS) +
light->value2) >> FRACBITS;
if (light->tics2 == 1)
{
if (light->sector->lightlevel >= light->value1)
{
light->sector->lightlevel = light->value1;
P_RemoveThinker(&light->thinker);
}
}
else if (light->sector->lightlevel <= light->value1)
{
light->sector->lightlevel = light->value1;
P_RemoveThinker(&light->thinker);
}
break;
case LITE_GLOW:
light->sector->lightlevel =
((light->sector->lightlevel << FRACBITS) +
light->tics1) >> FRACBITS;
if (light->tics2 == 1)
{
if (light->sector->lightlevel >= light->value1)
{
light->sector->lightlevel = light->value1;
light->tics1 = -light->tics1;
light->tics2 = -1; // reverse direction
}
}
else if (light->sector->lightlevel <= light->value2)
{
light->sector->lightlevel = light->value2;
light->tics1 = -light->tics1;
light->tics2 = 1; // reverse direction
}
break;
case LITE_FLICKER:
if (light->sector->lightlevel == light->value1)
{
light->sector->lightlevel = light->value2;
light->count = (P_Random() & 7) + 1;
}
else
{
light->sector->lightlevel = light->value1;
light->count = (P_Random() & 31) + 1;
}
break;
case LITE_STROBE:
if (light->sector->lightlevel == light->value1)
{
light->sector->lightlevel = light->value2;
light->count = light->tics2;
}
else
{
light->sector->lightlevel = light->value1;
light->count = light->tics1;
}
break;
default:
break;
}
}
//============================================================================
//
// EV_SpawnLight
//
//============================================================================
boolean EV_SpawnLight(line_t * line, byte * arg, lighttype_t type)
{
light_t *light;
sector_t *sec;
int secNum;
int arg1, arg2, arg3, arg4;
boolean think;
boolean rtn;
/*
Original code; redundant considering that a byte value is always
in the range 0-255:
arg1 = arg[1] > 255 ? 255 : arg[1];
arg1 = arg1 < 0 ? 0 : arg1;
arg2 = arg[2] > 255 ? 255 : arg[2];
arg2 = arg2 < 0 ? 0 : arg2;
arg3 = arg[3] > 255 ? 255 : arg[3];
arg3 = arg3 < 0 ? 0 : arg3;
arg4 = arg[4] > 255 ? 255 : arg[4];
arg4 = arg4 < 0 ? 0 : arg4;
*/
arg1 = arg[1];
arg2 = arg[2];
arg3 = arg[3];
arg4 = arg[4];
secNum = -1;
rtn = false;
think = false;
while ((secNum = P_FindSectorFromTag(arg[0], secNum)) >= 0)
{
think = false;
sec = §ors[secNum];
light = (light_t *) Z_Malloc(sizeof(light_t), PU_LEVSPEC, 0);
light->type = type;
light->sector = sec;
light->count = 0;
rtn = true;
switch (type)
{
case LITE_RAISEBYVALUE:
sec->lightlevel += arg1;
if (sec->lightlevel > 255)
{
sec->lightlevel = 255;
}
break;
case LITE_LOWERBYVALUE:
sec->lightlevel -= arg1;
if (sec->lightlevel < 0)
{
sec->lightlevel = 0;
}
break;
case LITE_CHANGETOVALUE:
sec->lightlevel = arg1;
if (sec->lightlevel < 0)
{
sec->lightlevel = 0;
}
else if (sec->lightlevel > 255)
{
sec->lightlevel = 255;
}
break;
case LITE_FADE:
think = true;
light->value1 = arg1; // destination lightlevel
light->value2 = FixedDiv((arg1 - sec->lightlevel) << FRACBITS, arg2 << FRACBITS); // delta lightlevel
if (sec->lightlevel <= arg1)
{
light->tics2 = 1; // get brighter
}
else
{
light->tics2 = -1;
}
break;
case LITE_GLOW:
think = true;
light->value1 = arg1; // upper lightlevel
light->value2 = arg2; // lower lightlevel
light->tics1 = FixedDiv((arg1 - sec->lightlevel) << FRACBITS, arg3 << FRACBITS); // lightlevel delta
if (sec->lightlevel <= arg1)
{
light->tics2 = 1; // get brighter
}
else
{
light->tics2 = -1;
}
break;
case LITE_FLICKER:
think = true;
light->value1 = arg1; // upper lightlevel
light->value2 = arg2; // lower lightlevel
sec->lightlevel = light->value1;
light->count = (P_Random() & 64) + 1;
break;
case LITE_STROBE:
think = true;
light->value1 = arg1; // upper lightlevel
light->value2 = arg2; // lower lightlevel
light->tics1 = arg3; // upper tics
light->tics2 = arg4; // lower tics
light->count = arg3;
sec->lightlevel = light->value1;
break;
default:
rtn = false;
break;
}
if (think)
{
P_AddThinker(&light->thinker);
light->thinker.function = T_Light;
}
else
{
Z_Free(light);
}
}
return rtn;
}
//============================================================================
//
// T_Phase
//
//============================================================================
int PhaseTable[64] = {
128, 112, 96, 80, 64, 48, 32, 32,
16, 16, 16, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 16, 16, 16,
32, 32, 48, 64, 80, 96, 112, 128
};
void T_Phase(phase_t * phase)
{
phase->index = (phase->index + 1) & 63;
phase->sector->lightlevel = phase->base + PhaseTable[phase->index];
}
//==========================================================================
//
// P_SpawnPhasedLight
//
//==========================================================================
void P_SpawnPhasedLight(sector_t * sector, int base, int index)
{
phase_t *phase;
phase = Z_Malloc(sizeof(*phase), PU_LEVSPEC, 0);
P_AddThinker(&phase->thinker);
phase->sector = sector;
if (index == -1)
{ // sector->lightlevel as the index
phase->index = sector->lightlevel & 63;
}
else
{
phase->index = index & 63;
}
phase->base = base & 255;
sector->lightlevel = phase->base + PhaseTable[phase->index];
phase->thinker.function = T_Phase;
sector->special = 0;
}
//==========================================================================
//
// P_SpawnLightSequence
//
//==========================================================================
void P_SpawnLightSequence(sector_t * sector, int indexStep)
{
sector_t *sec;
sector_t *nextSec;
sector_t *tempSec;
int seqSpecial;
int i;
int count;
fixed_t index;
fixed_t indexDelta;
int base;
seqSpecial = LIGHT_SEQUENCE; // look for Light_Sequence, first
sec = sector;
count = 1;
do
{
nextSec = NULL;
sec->special = LIGHT_SEQUENCE_START; // make sure that the search doesn't back up.
for (i = 0; i < sec->linecount; i++)
{
tempSec = getNextSector(sec->lines[i], sec);
if (!tempSec)
{
continue;
}
if (tempSec->special == seqSpecial)
{
if (seqSpecial == LIGHT_SEQUENCE)
{
seqSpecial = LIGHT_SEQUENCE_ALT;
}
else
{
seqSpecial = LIGHT_SEQUENCE;
}
nextSec = tempSec;
count++;
}
}
sec = nextSec;
}
while (sec);
sec = sector;
count *= indexStep;
index = 0;
indexDelta = FixedDiv(64 * FRACUNIT, count * FRACUNIT);
base = sector->lightlevel;
do
{
nextSec = NULL;
if (sec->lightlevel)
{
base = sec->lightlevel;
}
P_SpawnPhasedLight(sec, base, index >> FRACBITS);
index += indexDelta;
for (i = 0; i < sec->linecount; i++)
{
tempSec = getNextSector(sec->lines[i], sec);
if (!tempSec)
{
continue;
}
if (tempSec->special == LIGHT_SEQUENCE_START)
{
nextSec = tempSec;
}
}
sec = nextSec;
}
while (sec);
}