food.c

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/****************************************************************

 food.c

 =============================================================

 Copyright 1996-2014 Tom Barbalet. All rights reserved.

 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
 files (the "Software"), to deal in the Software without
 restriction, including without limitation the rights to use,
 copy, modify, merge, publish, distribute, sublicense, and/or
 sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following
 conditions:

 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.

 This software and Noble Ape are a continuing work of Tom Barbalet,
 begun on 13 June 1996. No apes or cats were harmed in the writing
 of this software.

 ****************************************************************/

#include "entity.h"
#include "entity_internal.h"

#define GENE_ENERGY_FROM_VEGETABLES(gene)   GENE_VAL_REG(gene, 3, 13, 15, 3)

#define GENE_ENERGY_FROM_FRUITS(gene)       GENE_VAL_REG(gene, 14, 7, 6, 4)

#define GENE_ENERGY_FROM_SHELLFISH(gene)    GENE_VAL_REG(gene, 10, 12, 12, 2)

#define GENE_ENERGY_FROM_SEAWEED(gene)      GENE_VAL_REG(gene, 0, 9, 11, 12)

#define GENE_ENERGY_FROM_BIRD_EGGS(gene)    GENE_VAL_REG(gene, 7, 1, 9, 5)

#define GENE_ENERGY_FROM_LIZARD_EGGS(gene)  GENE_VAL_REG(gene, 15, 3, 12, 8)


n_int food_absorption(noble_being * local, n_int max_energy, n_byte food_type)
{
    n_genetics * genetics = being_genetics(local);

    n_int   vegetable = GENE_ENERGY_FROM_VEGETABLES(genetics);
    n_int   fruit = GENE_ENERGY_FROM_FRUITS(genetics);
    n_int   shellfish = GENE_ENERGY_FROM_SHELLFISH(genetics);
    n_int   seawood = GENE_ENERGY_FROM_SEAWEED(genetics);

    n_int   bird_eggs = GENE_ENERGY_FROM_BIRD_EGGS(genetics);
    n_int   lizard_eggs = GENE_ENERGY_FROM_LIZARD_EGGS(genetics);
    
    n_int        return_value = 0;
    n_int absorb_denom = 1 + vegetable + fruit + seawood + bird_eggs + lizard_eggs;
    
    being_ingest_pathogen(local, food_type);
    
    switch (food_type)
    {
    case FOOD_VEGETABLE:
        return_value = (vegetable << 4) / absorb_denom;
        break;
    case FOOD_FRUIT:
        return_value = (fruit << 4) / absorb_denom;
        break;
    case FOOD_SHELLFISH:
        return_value = (shellfish << 4) / absorb_denom;
        break;
    case FOOD_SEAWEED:
        return_value = (seawood << 4) / absorb_denom;
        break;
    case FOOD_BIRD_EGGS:
        return_value = (seawood << 4) / absorb_denom;
        break;
    case FOOD_LIZARD_EGGS:
        return_value = (seawood << 4) / absorb_denom;
        break;
    default:
        return 0;
    }

    return_value = (max_energy * (1 + return_value) >> 3);

    if (return_value > 320)
    {
        return_value = 320; 
    }
    return return_value;
}

static n_int food_location(n_land * local_land,
                           n_int loc_x,
                           n_int loc_y,
                           n_int kind)
{
    return land_operator_interpolated(local_land, loc_x, loc_y,
                                      (n_byte*)&operators[kind - VARIABLE_BIOLOGY_AREA]);
}

void food_values(n_land * local_land,
                 n_int loc_x,
                 n_int loc_y,
                 n_int *grass, n_int *trees, n_int *bush)
{
    /* TODO include bird and lizard eggs */
    
    *grass =
        food_location(local_land, loc_x, loc_y, VARIABLE_BIOLOGY_GRASS)+OFFSET_GRASS;

    *trees =
        food_location(local_land, loc_x, loc_y, VARIABLE_BIOLOGY_TREE);

    *bush =
        food_location(local_land, loc_x, loc_y, VARIABLE_BIOLOGY_BUSH)+OFFSET_BUSH;

    *grass += LAND_DITHER(*grass, *trees, *bush);
}

static n_byte food_eat_land(
    n_land * local_land,
    n_int loc_x,
    n_int loc_y,
    n_int * energy)
{
    n_byte food_type = FOOD_VEGETABLE;
    n_int grass, trees, bush;

    /* TODO Handle this logic centrally - including the int values in the function not outside */
    
    food_values(local_land, loc_x,loc_y,&grass, &trees, &bush);

    if ((grass > bush) && (grass > trees))
    {
        *energy = ENERGY_GRASS;
    }
    else
    {
        if (bush > trees)
        {
            *energy = ENERGY_BUSH;
        }
        else
        {
            *energy = ENERGY_FRUIT;
            food_type = FOOD_FRUIT;
        }
    }
    return food_type;
}

static n_byte food_intertidal(
    n_land * local_land,
    n_int loc_x,
    n_int loc_y,
    n_int * energy)
{
    n_byte food_type = FOOD_VEGETABLE;
    n_int seaweed, rockpool, beach;

    seaweed =
        food_location(
            local_land, loc_x, loc_y, VARIABLE_BIOLOGY_SEAWEED);

    rockpool =
        food_location(
            local_land, loc_x, loc_y, VARIABLE_BIOLOGY_ROCKPOOL);

    beach =
        food_location(
            local_land, loc_x, loc_y, VARIABLE_BIOLOGY_BEACH);

    beach += LAND_DITHER(seaweed, rockpool, beach);

    if ((seaweed > rockpool) && (seaweed > beach))
    {
        *energy = ENERGY_SEAWEED;
        food_type = FOOD_SEAWEED;
    }
    else
    {
        if (rockpool > beach)
        {
            *energy = ENERGY_SHELLFISH;
            food_type = FOOD_SHELLFISH;
        }
    }
    return food_type;
}

n_int food_eat(
    n_land * local_land,
    n_int loc_x,
    n_int loc_y,
    n_int az,
    n_byte * food_type,
    noble_being * local_being)
{
    n_int max_energy = BEING_DEAD;

    *food_type = FOOD_VEGETABLE;

    if (az > TIDE_MAX)
    {
        *food_type = food_eat_land(local_land, loc_x, loc_y, &max_energy);
    }
    else
    {
        *food_type = food_intertidal(local_land, loc_x, loc_y, &max_energy);
    }

    return food_absorption(local_being, max_energy, *food_type);
}