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/*
* Tux-Town is a chill life-simulation game.
* Copyright (C) 2025 orangerot <me@orangerot.dev>
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include <raylib.h>
#include <stddef.h>
#include "assets.h"
#include "world.h"
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
#define CLAMP2(val, min, max) MIN(max, MAX(min, val))
#define CLAMP(val, min, max) ((val) < (min) ? (min) : ((val) > (max) ? (max) : (val)))
#define LROT(v,n) ((v << n) | (v >> (sizeof(v)*8 - n)))
#define RROT(v,n) ((v >> n) | (v << (sizeof(v)*8 - n)))
#define MAP_SIZE 64
struct ModelDirection {
enum Asset asset;
unsigned char pattern;
};
struct ModelDirection rivers[] = {
/* 0b12345678
* 1 | 2 | 3
* 8 | | 4
* 7 | 6 | 5
*/
{ .pattern = 0b11111111, .asset = ground_riverOpen },
// edge
{ .pattern = 0b11011111, .asset = ground_riverCornerSmall },
{ .pattern = 0b01011111, .asset = ground_riverSideOpen },
{ .pattern = 0b11110001, .asset = ground_riverSide },
{ .pattern = 0b01010101, .asset = ground_riverCross },
{ .pattern = 0b01010001, .asset = ground_riverSplit },
// STRAIGHT
{ .pattern = 0b01000100, .asset = ground_riverStraight },
// corner
{ .pattern = 0b11000001, .asset = ground_riverCorner },
// L SHAPE
{ .pattern = 0b01000001, .asset = ground_riverBend },
// closed
{ .pattern = 0b01000000, .asset = ground_riverEndClosed },
{ .pattern = 0b00000000, .asset = ground_riverTile },
};
void generate_river(struct World *world, int previous) {
Color *map_data = world->map_data;
int map_size = world->size;
int x = previous % map_size, y = previous / map_size;
if (x == 0 || x == map_size -1 || y == 0 || y == map_size -1) return;
int local_minimum_map_i = previous;
int local_minimum_val = 255;
int gradients[4][2] = {{0,-1},{-1,0},{0,1},{1,0}};
for (int gradient_i = 0; gradient_i < 4; gradient_i++) {
int dx = CLAMP(x + gradients[gradient_i][0], 0, map_size - 1);
int dy = CLAMP(y + gradients[gradient_i][1], 0, map_size - 1);
int i = dy * map_size + dx;
if (i == previous || map_data[i].r == 1) continue;
if (map_data[i].b < local_minimum_val) {
local_minimum_map_i = i;
local_minimum_val = map_data[i].b;
}
}
if (local_minimum_val == 255) return;
map_data[local_minimum_map_i].r = 1;
generate_river(world, local_minimum_map_i);
}
void select_river_tile(struct World *world, int x, int y, size_t *river_i, size_t *direction) {
Color *map_data = world->map_data;
int map_size = world->size;
int surrounding[8][2] = {{-1,-1},{0,-1},{1,-1},{1,0},{1,1},{0,1},{-1,1},{-1,0}};
unsigned char river_tile = 0;
for (int surrounding_i = 0; surrounding_i < 8; surrounding_i++) {
int dx = CLAMP(x + surrounding[surrounding_i][0], 0, map_size - 1);
int dy = CLAMP(y + surrounding[surrounding_i][1], 0, map_size - 1);
if (map_data[dy * map_size + dx].r)
river_tile |= 1 << (7 - surrounding_i);
}
for (*river_i = 0; *river_i < 11; (*river_i)++) {
for (*direction = 0; *direction < 4; (*direction)++) {
if ((rivers[*river_i].pattern & RROT(river_tile, 2 * *direction)) == rivers[*river_i].pattern) {
return;
}
}
}
}
void gen_terrain(struct World *world) {
int map_size = world->size;
size_t global_minimum_map_i;
size_t global_minimum_val = 255;
world->map = GenImagePerlinNoise(map_size, map_size, 0, 0, 1.f);
world->map_texture = LoadTextureFromImage(world->map);
world->map_data = LoadImageColors(world->map);
for (size_t i = 0; i < map_size * map_size; i++) {
int x = i % map_size, y = i / map_size;
Color c = world->map_data[i];
if (c.r < global_minimum_val) {
global_minimum_map_i = i;
global_minimum_val = world->map_data[i].b;
}
world->map_data[i] = (Color) {
.r = 0,
.g = MAX(0, c.g - 64) / 32,
.b = c.b,
.a = 255
};
}
world->map_data[global_minimum_map_i].r = 1;
generate_river(world, global_minimum_map_i);
generate_river(world, global_minimum_map_i);
}
void gen_room(struct World *world) {
int map_size = world->size;
world->map = GenImageColor(map_size, map_size, BLACK);
world->map_texture = LoadTextureFromImage(world->map);
world->map_data = LoadImageColors(world->map);
}
//
// void unload_world() {}
void draw_world(struct World *world) {
int map_size = world->size;
Color *map_data = world->map_data;
Model wall = world->wall;
Model ground = world->floor;
for (int i = 0; i < map_size * map_size; i++) {
int x = i % map_size, y = i / map_size;
int gradients[4][2] = {{0,-1},{-1,0},{0,1},{1,0}};
for (int gradient_i = 0; gradient_i < 4; gradient_i++) {
int dx = x + gradients[gradient_i][0];
int dy = y + gradients[gradient_i][1];
int is_border = (dx < 0 || dx >= map_size || dy < 0 || dy >= map_size);
dx = CLAMP(dx, 0, map_size - 1);
dy = CLAMP(dy, 0, map_size - 1);
int height = MAX(map_data[dy * map_size + dx].g, is_border);
for (int step = map_data[i].g; step < height; step++) {
DrawModelEx(wall,
(Vector3){
.x = map_size * (x / (float) map_size - 0.5f),
.y = step,
.z = map_size * (y / (float) map_size - 0.5f)
},
(Vector3) {0, 1, 0}, gradient_i * 90.f, (Vector3) {1,1,1}, WHITE);
}
}
size_t river_i, direction;
if (map_data[i].r) {
select_river_tile(world, x, y, &river_i, &direction);
}
DrawModelEx(map_data[i].r ? assets[rivers[river_i].asset] : ground,
(Vector3){
.x = map_size * (x / (float) map_size - 0.5f),
.y = map_data[i].g, //- (map_gradient_magnitude_data[i].g < 2),
.z = map_size * (y / (float) map_size - 0.5f)
} , (Vector3) {0,1,0}, map_data[i].r ? direction * 90.f: 0,
(Vector3) {1,1,1},
WHITE);
}
}
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