path: root/main.c

/*
 * 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 <raymath.h>
#include <stdbool.h>
#define RCAMERA_IMPLEMENTATION
#define RL_CULL_DISTANCE_NEAR      0.01
#define RL_CULL_DISTANCE_FAR    1000.0
#include <rcamera.h>
#include <stddef.h>

#include "assets.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;
};

void generate_river(Color *map_data, int previous) {
  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(map_data, local_minimum_map_i);
}

void select_river_tile(Color *map_data, struct ModelDirection *rivers, int x, int y, size_t *river_i, size_t *direction) {

  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;
      }
    }
  }
}


int main(void) {
  const int screenWidth = 800;
  const int screenHeight = 450;

  InitWindow(screenWidth, screenHeight, "raylib [core] example - basic window");

  Camera camera = { 0 };
  camera.position = (Vector3){ 5.0f, 5.0f, 5.0f };
  camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };
  camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
  camera.fovy = 45.0f;
  camera.projection = CAMERA_PERSPECTIVE;

  
  Vector3 player_pos = (Vector3) {0.f, 0.f, 0.f};

  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 },
  };

  enum Asset ground = ground_grass;
  enum Asset cliff = cliff_top_rock;
  enum Asset tree = tree_oak;
  enum Asset house = tent_detailedOpen;
  
  Vector3 position = {0};
  Image map = GenImagePerlinNoise(MAP_SIZE, MAP_SIZE, 0, 0, 1.f);
  Texture2D map_texture = LoadTextureFromImage(map);
  Color *map_data = LoadImageColors(map);
  size_t global_minimum_map_i;
  size_t global_minimum_val = 255;

  for (size_t i = 0; i < MAP_SIZE * MAP_SIZE; i++) {
    int x = i % MAP_SIZE, y = i / MAP_SIZE;
    Color c = map_data[i];
    if (c.r < global_minimum_val) {
      global_minimum_map_i = i;
      global_minimum_val = map_data[i].b;
    }
    map_data[i] = (Color) {
      .r = 0,
      .g = MAX(0, c.g - 64) / 32,
      .b = c.b,
      .a = 255
    };
  }

  map_data[global_minimum_map_i].r = 1;
  generate_river(map_data, global_minimum_map_i);
  generate_river(map_data, global_minimum_map_i);

  LoadModels();
  
#define NUM_TREES MAP_SIZE * MAP_SIZE / 100
  int *trees_x = LoadRandomSequence(NUM_TREES, -MAP_SIZE / 2, MAP_SIZE / 2);
  int *trees_y = LoadRandomSequence(NUM_TREES, - MAP_SIZE / 2, MAP_SIZE / 2);

  // SetTargetFPS(60);
  DisableCursor();
  while (!WindowShouldClose()) {
    Vector2 mousePositionDelta = GetMouseDelta();
    // UpdateCamera(&camera, CAMERA_THIRD_PERSON);
    Vector3 camera_forward = GetCameraForward(&camera);
    camera.target = Vector3Add(player_pos, (Vector3){0,.2f,0});
    camera.position = Vector3Add(camera.target, Vector3Scale(camera_forward, -2.f));
    CameraYaw(&camera, -mousePositionDelta.x*CAMERA_MOUSE_MOVE_SENSITIVITY, true);
    CameraPitch(&camera, -mousePositionDelta.y*CAMERA_MOUSE_MOVE_SENSITIVITY, true, true, false);

    Vector3 camera_forward_flat = camera_forward;
    camera_forward_flat.y = 0;
    camera_forward_flat = Vector3Normalize(camera_forward_flat);
    float velocity = 1.f * GetFrameTime();
    if (IsKeyDown(KEY_UP)) player_pos = Vector3Add(player_pos, Vector3Scale(camera_forward_flat, velocity));
    if (IsKeyDown(KEY_DOWN)) player_pos = Vector3Add(player_pos, Vector3Scale(camera_forward_flat, -velocity));
    if (IsKeyDown(KEY_RIGHT)) player_pos = Vector3Add(player_pos, Vector3Scale(GetCameraRight(&camera), velocity));
    if (IsKeyDown(KEY_LEFT)) player_pos = Vector3Add(player_pos, Vector3Scale(GetCameraRight(&camera), -velocity));

    BeginDrawing();
    ClearBackground(RAYWHITE);
    BeginMode3D(camera);
    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 = CLAMP(x + gradients[gradient_i][0], 0, MAP_SIZE - 1);
        int dy = CLAMP(y + gradients[gradient_i][1], 0, MAP_SIZE - 1);
        for (int height = map_data[i].g; height < map_data[dy * MAP_SIZE + dx].g; height++) {
          DrawModelEx(assets[cliff],
              (Vector3){
              .x = MAP_SIZE * (x / (float) MAP_SIZE - 0.5f), 
              .y = height,
              .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(map_data, rivers, x, y, &river_i, &direction);
      }
      DrawModelEx(assets[map_data[i].r ? 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);
    }
    for (int tree_i = 0; tree_i < NUM_TREES; tree_i++) {
      DrawModel(assets[tree], (Vector3) {trees_x[tree_i], 0, trees_y[tree_i]}, 1.f, WHITE);
    }
    DrawModel(assets[house], (Vector3) {-1, 0, 0}, 1.f, WHITE);
    DrawGrid(20, 10.0f);
    Vector3 capsule_top = player_pos;
    capsule_top.y += 0.2f;
    DrawCapsule(Vector3Add(player_pos, (Vector3){0,.1f,0}), capsule_top, .1f, 8, 8, BLUE);
    EndMode3D();
    DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
    DrawTexture(map_texture, 0, 0, WHITE);
    EndDrawing();
  }

  CloseWindow();

  return 0;
}