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//Copyright Paul Reiche, Fred Ford. 1992-2002
/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "lifeform.h"
#include "planets.h"
#include "libs/mathlib.h"
#include "libs/log.h"
//#define DEBUG_SURFACE
const BYTE *Elements;
const PlanetFrame *PlanData;
static COUNT
CalcMineralDeposits (const SYSTEM_INFO *SysInfoPtr, COUNT which_deposit,
NODE_INFO *info)
{
BYTE j;
COUNT num_deposits;
const ELEMENT_ENTRY *eptr;
eptr = &SysInfoPtr->PlanetInfo.PlanDataPtr->UsefulElements[0];
num_deposits = 0;
j = NUM_USEFUL_ELEMENTS;
do
{
BYTE num_possible;
num_possible = LOBYTE (RandomContext_Random (SysGenRNG))
% (DEPOSIT_QUANTITY (eptr->Density) + 1);
while (num_possible--)
{
#define MEDIUM_DEPOSIT_THRESHOLD 150
#define LARGE_DEPOSIT_THRESHOLD 225
COUNT deposit_quality_fine;
COUNT deposit_quality_gross;
deposit_quality_fine = (LOWORD (RandomContext_Random (SysGenRNG)) % 100)
+ (
DEPOSIT_QUALITY (eptr->Density)
+ SysInfoPtr->StarSize
) * 50;
if (deposit_quality_fine < MEDIUM_DEPOSIT_THRESHOLD)
deposit_quality_gross = 0;
else if (deposit_quality_fine < LARGE_DEPOSIT_THRESHOLD)
deposit_quality_gross = 1;
else
deposit_quality_gross = 2;
GenerateRandomLocation (&info->loc_pt);
info->density = MAKE_WORD (
deposit_quality_gross, deposit_quality_fine / 10 + 1);
info->type = eptr->ElementType;
#ifdef DEBUG_SURFACE
log_add (log_Debug, "\t\t%d units of %Fs",
info->density,
Elements[eptr->ElementType].name);
#endif /* DEBUG_SURFACE */
if (num_deposits >= which_deposit
|| ++num_deposits == sizeof (DWORD) * 8)
{ // reached the maximum or the requested node
return num_deposits;
}
}
++eptr;
} while (--j);
return num_deposits;
}
// Returns:
// for whichLife==~0 : the number of nodes generated
// for whichLife<32 : the index of the last node (no known usage exists)
// Sets the SysGenRNG to the required state first.
COUNT
GenerateMineralDeposits (const SYSTEM_INFO *SysInfoPtr, COUNT whichDeposit,
NODE_INFO *info)
{
NODE_INFO temp_info;
if (!info) // user not interested in info but we need space for it
info = &temp_info;
RandomContext_SeedRandom (SysGenRNG,
SysInfoPtr->PlanetInfo.ScanSeed[MINERAL_SCAN]);
return CalcMineralDeposits (SysInfoPtr, whichDeposit, info);
}
static COUNT
CalcLifeForms (const SYSTEM_INFO *SysInfoPtr, COUNT which_life,
NODE_INFO *info)
{
COUNT num_life_forms;
num_life_forms = 0;
if (PLANSIZE (SysInfoPtr->PlanetInfo.PlanDataPtr->Type) != GAS_GIANT)
{
#define MIN_LIFE_CHANCE 10
SIZE life_var;
life_var = RandomContext_Random (SysGenRNG) & 1023;
if (life_var < SysInfoPtr->PlanetInfo.LifeChance
|| (SysInfoPtr->PlanetInfo.LifeChance < MIN_LIFE_CHANCE
&& life_var < MIN_LIFE_CHANCE))
{
BYTE num_types;
num_types = 1 + LOBYTE (RandomContext_Random (SysGenRNG))
% MAX_LIFE_VARIATION;
do
{
BYTE index, num_creatures;
UWORD rand_val;
rand_val = RandomContext_Random (SysGenRNG);
index = LOBYTE (rand_val) % NUM_CREATURE_TYPES;
num_creatures = 1 + HIBYTE (rand_val) % 10;
do
{
GenerateRandomLocation (&info->loc_pt);
info->type = index;
info->density = 0;
if (num_life_forms >= which_life
|| ++num_life_forms == sizeof (DWORD) * 8)
{ // reached the maximum or the requested node
return num_life_forms;
}
} while (--num_creatures);
} while (--num_types);
}
#ifdef DEBUG_SURFACE
else
{
log_add (log_Debug, "It's dead, Jim! (%d >= %d)", life_var,
SysInfoPtr->PlanetInfo.LifeChance);
}
#endif /* DEBUG_SURFACE */
}
return num_life_forms;
}
// Returns:
// for whichLife==~0 : the number of lifeforms generated
// for whichLife<32 : the index of the last lifeform (no known usage exists)
// Sets the SysGenRNG to the required state first.
COUNT
GenerateLifeForms (const SYSTEM_INFO *SysInfoPtr, COUNT whichLife,
NODE_INFO *info)
{
NODE_INFO temp_info;
if (!info) // user not interested in info but we need space for it
info = &temp_info;
RandomContext_SeedRandom (SysGenRNG,
SysInfoPtr->PlanetInfo.ScanSeed[BIOLOGICAL_SCAN]);
return CalcLifeForms (SysInfoPtr, whichLife, info);
}
// Returns:
// for whichLife==~0 : the number of lifeforms generated
// for whichLife<32 : the index of the last lifeform (no known usage exists)
// Sets the SysGenRNG to the required state first.
// lifeTypes[] is terminated with -1
COUNT
GeneratePresetLife (const SYSTEM_INFO *SysInfoPtr, const SBYTE *lifeTypes,
COUNT whichLife, NODE_INFO *info)
{
COUNT i;
NODE_INFO temp_info;
if (!info) // user not interested in info but we need space for it
info = &temp_info;
// This function may look unnecessarily complicated, but it must be
// kept this way to preserve the universe. That is done by preserving
// the order and number of Random() calls.
RandomContext_SeedRandom (SysGenRNG,
SysInfoPtr->PlanetInfo.ScanSeed[BIOLOGICAL_SCAN]);
for (i = 0; lifeTypes[i] >= 0; ++i)
{
GenerateRandomLocation (&info->loc_pt);
info->type = lifeTypes[i];
// density is irrelevant for bio nodes
info->density = 0;
if (i >= whichLife)
break;
}
return i;
}
void
GenerateRandomLocation (POINT *loc)
{
UWORD rand_val;
rand_val = RandomContext_Random (SysGenRNG);
loc->x = 8 + LOBYTE (rand_val) % (MAP_WIDTH - (8 << 1));
loc->y = 8 + HIBYTE (rand_val) % (MAP_HEIGHT - (8 << 1));
}
// Returns:
// for whichNode==~0 : the number of nodes generated
// for whichNode<32 : the index of the last node (no known usage exists)
// Sets the SysGenRNG to the required state first.
COUNT
GenerateRandomNodes (const SYSTEM_INFO *SysInfoPtr, COUNT scan, COUNT numNodes,
COUNT type, COUNT whichNode, NODE_INFO *info)
{
COUNT i;
NODE_INFO temp_info;
if (!info) // user not interested in info but we need space for it
info = &temp_info;
RandomContext_SeedRandom (SysGenRNG,
SysInfoPtr->PlanetInfo.ScanSeed[scan]);
for (i = 0; i < numNodes; ++i)
{
GenerateRandomLocation (&info->loc_pt);
// type is irrelevant for energy nodes
info->type = type;
// density is irrelevant for energy and bio nodes
info->density = 0;
if (i >= whichNode)
break;
}
return i;
}
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