Added unit tests

.gitignore

@@ -1 +1,3 @@
 main
+save.dat
+munit/

Makefile

@@ -4,6 +4,8 @@ LIBS = -lraylib -lm -lpthread -ldl
 
 TARGET = main
 SRC = main.c game.c ui.c
+TEST_TARGET = munit_tests
+TEST_SRC = munit.c game.c munit/munit.c
 
 all: $(TARGET)
 
@@ -16,4 +18,10 @@ clean:
 run: $(TARGET)
 	./$(TARGET)
 
-.PHONY: all clean run
+test: $(TEST_TARGET)
+	./$(TEST_TARGET)
+
+$(TEST_TARGET): $(TEST_SRC)
+	$(CC) $(CFLAGS) $(TEST_SRC) -o $(TEST_TARGET) $(LIBS)
+
+.PHONY: all clean run test

game.c

@@ -1,10 +1,14 @@
 #include "game.h"
+#include <raylib.h>
+#include <stdbool.h>
 #include <stdlib.h>
+#include <string.h>
 
 // Depending on the direction, move the tiles and check if we can merge with the
 // tiles in that direction. We merge the tiles only if they are of the same value
-void move(GameState_t *state, MOVE_DIRECTION direction) {
+bool move(GameState_t *state, move_direction_t direction) {
   bool merged[BOARD_HEIGHT][BOARD_WIDTH] = {0};
+  bool moved = false;
   switch (direction) {
   case UP: {
     for (int y = 1; y < BOARD_HEIGHT; y++) {
@@ -43,6 +47,7 @@ void move(GameState_t *state, MOVE_DIRECTION direction) {
           state->board[y][x] = 0;
           state->score += state->board[target_y][x];
         }
+        moved = true;
       }
     }
     break;
@@ -77,6 +82,7 @@ void move(GameState_t *state, MOVE_DIRECTION direction) {
           state->board[y][x] = 0;
           state->score += state->board[target_y][x];
         }
+        moved = true;
       }
     }
     break;
@@ -111,6 +117,7 @@ void move(GameState_t *state, MOVE_DIRECTION direction) {
           state->board[y][x] = 0;
           state->score += state->board[y][target_x];
         }
+        moved = true;
       }
     }
     break;
@@ -145,22 +152,23 @@ void move(GameState_t *state, MOVE_DIRECTION direction) {
           state->board[y][x] = 0;
           state->score += state->board[y][target_x];
         }
+        moved = true;
       }
     }
     break;
   }
   }
+  if (moved)
     state->moves_made++;
+
+  return moved;
 }
 
 void reset_board(GameState_t *state) {
-  for (int y = 0; y < BOARD_HEIGHT; y++) {
+  memset(state->board, 0, sizeof(state->board));
-    for (int x = 0; x < BOARD_WIDTH; x++) {
-      state->board[y][x] = 0;
-    }
-  }
   state->score = 0;
   state->moves_made = 0;
+  state->status = PLAYING;
 
   int tile_count = 0;
   while (tile_count != STARTING_TILES) {
@@ -172,9 +180,14 @@ void reset_board(GameState_t *state) {
     state->board[y][x] = (rand() % 10 == 0) ? 4 : 2; // 10% chance to spawn a 4
     tile_count++;
   }
+  FILE *f = fopen("save.dat", "wb");
+  if (f) {
+    fwrite(state, sizeof(GameState_t), 1, f);
+    fclose(f);
+  }
 }
 
-bool spawn_tile(GameState_t *state) {
+void spawn_tile(GameState_t *state, Vector2 *spawned_tile_pos) {
   int empty_tiles[BOARD_WIDTH * BOARD_HEIGHT][2];
   int empty_count = 0;
 
@@ -189,11 +202,32 @@ bool spawn_tile(GameState_t *state) {
   }
 
   if (empty_count == 0)
-    return false;
+    return;
 
   int random_index = rand() % empty_count;
   int spawn_y = empty_tiles[random_index][0];
   int spawn_x = empty_tiles[random_index][1];
   state->board[spawn_y][spawn_x] = (rand() % 10 == 0) ? 4 : 2; // 10% chance to spawn a 4
+
+  spawned_tile_pos->x = spawn_x;
+  spawned_tile_pos->y = spawn_y;
+
+  return;
+}
+
+// This function will only run, if every tile is filled (checked by `spawn_tile`). We can take advantage of that and
+// just check every neighboring cell for equal values for merging
+bool can_move(GameState_t *state) {
+  for (int y = 0; y < BOARD_HEIGHT; y++) {
+    for (int x = 0; x < BOARD_WIDTH; x++) {
+      if (state->board[y][x] == 0)
+        return true;
+
+      if (x < BOARD_WIDTH - 1 && state->board[y][x] == state->board[y][x + 1])
+        return true;
+      if (y < BOARD_HEIGHT - 1 && state->board[y][x] == state->board[y + 1][x])
         return true;
     }
+  }
+  return false;
+}

game.h

@@ -1,19 +1,22 @@
 #pragma once
 #include <raylib.h>
+#include <stdio.h>
 
 #define BOARD_WIDTH 4
 #define BOARD_HEIGHT 4
 #define STARTING_TILES 3
 
-typedef enum { UP = 0, DOWN, LEFT, RIGHT } MOVE_DIRECTION;
+typedef enum { UP, DOWN, LEFT, RIGHT } move_direction_t;
+typedef enum { PLAYING, WON, LOST } game_status_t;
 
 typedef struct {
-    int board[BOARD_HEIGHT][BOARD_WIDTH];
+  unsigned int board[BOARD_HEIGHT][BOARD_WIDTH];
-    int score;
+  game_status_t status;
-    int moves_made;
+  unsigned int score;
+  unsigned int moves_made;
 } GameState_t;
 
-
+bool move(GameState_t *state, move_direction_t direction);
-void move(GameState_t *state, MOVE_DIRECTION direction);
 void reset_board(GameState_t *state);
-bool spawn_tile(GameState_t *state);
+void spawn_tile(GameState_t *state, Vector2 *spawned_tile_pos);
+bool can_move(GameState_t *state);

main.c

@@ -1,71 +1,48 @@
 #include "raylib.h"
 #include <math.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
 
 #include "game.h"
 #include "ui.h"
 
-const Color tile_colors[] = {
-    LIGHTGRAY, // 0 - Empty
-    BEIGE,     // 2
-    GOLD,      // 4
-    ORANGE,    // 8
-    ORANGE,    // 16
-    RED,       // 32
-    MAROON,    // 64
-    YELLOW,    // 128
-    GOLD,      // 256
-    ORANGE,    // 512
-    RED,       // 1024
-    MAROON,    // 2048
-    PINK,      // 4096
-    MAGENTA,   // 8192
-};
-
 static GameState_t game_state;
 
 int main() {
   srand(time(NULL));
 
+  FILE *game_file = fopen("save.dat", "rb");
+  if (game_file != NULL) {
+    if (fread(&game_state, sizeof(GameState_t), 1, game_file) != 1) {
       reset_board(&game_state);
+    }
+    fclose(game_file);
+  } else {
+    reset_board(&game_state);
+  }
 
-  InitWindow(800, 600, "2048");
+  SetConfigFlags(FLAG_WINDOW_HIGHDPI);
-  SetTargetFPS(30); // So my laptop doesn't burn
+  InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "2048");
+  SetTargetFPS(90); // We have event blocking so we can affort higher FPS
+  EnableEventWaiting();
 
   while (!WindowShouldClose()) {
-    ClearBackground(RAYWHITE);
     BeginDrawing();
+    ClearBackground(RAYWHITE);
 
-    for (int y = 0; y < BOARD_HEIGHT; y++) {
+    // If we are not animating, we can wait for input events instead of continuously rendering
-      for (int x = 0; x < BOARD_WIDTH; x++) {
+    bool animating = render(&game_state);
-        int tile_value = game_state.board[y][x];
+    if (animating) {
-        int pos_x = BOARD_MARGIN + x * (TILE_SIZE + TILE_SPACING);
+      DisableEventWaiting();
-        int pos_y = BOARD_MARGIN + y * (TILE_SIZE + TILE_SPACING);
+    } else {
-        int color_index = (tile_value == 0) ? 0 : (int)log2(tile_value);
+      EnableEventWaiting();
-
-        if (color_index >= sizeof(tile_colors) / sizeof(tile_colors[0])) {
-          color_index = sizeof(tile_colors) / sizeof(tile_colors[0]) - 1; // Cap to the last color
     }
 
-        DrawRectangle(pos_x, pos_y, TILE_SIZE, TILE_SIZE, tile_colors[color_index]);
-        if (tile_value != 0) {
-          const char *text = TextFormat("%d", tile_value);
-          DrawText(text, pos_x + TILE_SIZE / 2 - MeasureText(text, 20) / 2, pos_y + TILE_SIZE / 2 - 10, 20, BLACK);
-        }
-      }
-    }
-
-    DrawText(TextFormat("Score: %d", game_state.score), 600, BOARD_MARGIN, 20, BLACK);
-    DrawText(TextFormat("Moves used: %d", game_state.moves_made), 600, BOARD_MARGIN + 20, 20, BLACK);
-
-    // Reset button
-    DrawRectangle(500, 455, 275, 24, RED);
-    DrawText("Reset", 500 + 275 / 2 - MeasureText("Reset", 20) / 2, 455 + 4, 20, WHITE);
-
     EndDrawing();
     handle_mouse_input(&game_state);
+    handle_keyboard_input(&game_state);
   }
   CloseWindow();
   return 0;

munit.c

@@ -0,0 +1,370 @@
+#include "munit/munit.h"
+#include "game.h"
+
+#include <stdlib.h>
+
+static void clear_tiles(GameState_t *state) {
+  for (int y = 0; y < BOARD_HEIGHT; y++) {
+    for (int x = 0; x < BOARD_WIDTH; x++) {
+      state->board[y][x] = 0;
+    }
+  }
+}
+
+static void *test_setup(const MunitParameter params[], void *user_data) {
+  (void)params;
+  (void)user_data;
+
+  GameState_t *state = (GameState_t *)malloc(sizeof(GameState_t));
+  munit_assert_not_null(state);
+
+  reset_board(state);
+  clear_tiles(state);
+  return state;
+}
+
+static void test_tear_down(void *fixture) {
+  free(fixture);
+}
+
+static MunitResult test_merge_left_simple(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[0][1] = 2;
+
+  munit_assert_true(move(state, LEFT));
+  munit_assert_int(state->board[0][0], ==, 4);
+  munit_assert_int(state->board[0][1], ==, 0);
+  munit_assert_uint(state->score, ==, 4);
+  munit_assert_uint(state->moves_made, ==, 1);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_left_through_gap(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[0][2] = 2;
+
+  munit_assert_true(move(state, LEFT));
+  munit_assert_int(state->board[0][0], ==, 4);
+  munit_assert_int(state->board[0][1], ==, 0);
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[0][3], ==, 0);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_left_double_pair(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[0][1] = 2;
+  state->board[0][2] = 4;
+  state->board[0][3] = 4;
+
+  munit_assert_true(move(state, LEFT));
+  munit_assert_int(state->board[0][0], ==, 4);
+  munit_assert_int(state->board[0][1], ==, 8);
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[0][3], ==, 0);
+  munit_assert_uint(state->score, ==, 12);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_left_no_double_merge_single_move(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[0][1] = 2;
+  state->board[0][2] = 2;
+
+  munit_assert_true(move(state, LEFT));
+  munit_assert_int(state->board[0][0], ==, 4);
+  munit_assert_int(state->board[0][1], ==, 2);
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[0][3], ==, 0);
+  munit_assert_uint(state->score, ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_move_left_no_merge_when_different_values(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][1] = 2;
+  state->board[0][2] = 4;
+
+  munit_assert_true(move(state, LEFT));
+  munit_assert_int(state->board[0][0], ==, 2);
+  munit_assert_int(state->board[0][1], ==, 4);
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[0][3], ==, 0);
+  munit_assert_uint(state->score, ==, 0);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_move_returns_false_when_nothing_changes(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[0][1] = 4;
+  state->board[0][2] = 8;
+  state->board[0][3] = 16;
+
+  munit_assert_false(move(state, LEFT));
+  munit_assert_uint(state->moves_made, ==, 0);
+  munit_assert_uint(state->score, ==, 0);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_right_simple(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][2] = 2;
+  state->board[1][3] = 2;
+
+  munit_assert_true(move(state, RIGHT));
+  munit_assert_int(state->board[1][0], ==, 0);
+  munit_assert_int(state->board[1][1], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[1][3], ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_right_through_gap(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][1] = 2;
+  state->board[1][3] = 2;
+
+  munit_assert_true(move(state, RIGHT));
+  munit_assert_int(state->board[1][0], ==, 0);
+  munit_assert_int(state->board[1][1], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[1][3], ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_right_double_pair(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][0] = 2;
+  state->board[1][1] = 2;
+  state->board[1][2] = 4;
+  state->board[1][3] = 4;
+
+  munit_assert_true(move(state, RIGHT));
+  munit_assert_int(state->board[1][0], ==, 0);
+  munit_assert_int(state->board[1][1], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 4);
+  munit_assert_int(state->board[1][3], ==, 8);
+  munit_assert_uint(state->score, ==, 12);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_right_no_double_merge_single_move(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][1] = 2;
+  state->board[1][2] = 2;
+  state->board[1][3] = 2;
+
+  munit_assert_true(move(state, RIGHT));
+  munit_assert_int(state->board[1][0], ==, 0);
+  munit_assert_int(state->board[1][1], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 2);
+  munit_assert_int(state->board[1][3], ==, 4);
+  munit_assert_uint(state->score, ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_up_simple(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][0] = 2;
+  state->board[1][0] = 2;
+
+  munit_assert_true(move(state, UP));
+  munit_assert_int(state->board[0][0], ==, 4);
+  munit_assert_int(state->board[1][0], ==, 0);
+  munit_assert_int(state->board[2][0], ==, 0);
+  munit_assert_int(state->board[3][0], ==, 0);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_up_through_gap(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][1] = 2;
+  state->board[2][1] = 2;
+
+  munit_assert_true(move(state, UP));
+  munit_assert_int(state->board[0][1], ==, 4);
+  munit_assert_int(state->board[1][1], ==, 0);
+  munit_assert_int(state->board[2][1], ==, 0);
+  munit_assert_int(state->board[3][1], ==, 0);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_up_double_pair(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][1] = 2;
+  state->board[1][1] = 2;
+  state->board[2][1] = 4;
+  state->board[3][1] = 4;
+
+  munit_assert_true(move(state, UP));
+  munit_assert_int(state->board[0][1], ==, 4);
+  munit_assert_int(state->board[1][1], ==, 8);
+  munit_assert_int(state->board[2][1], ==, 0);
+  munit_assert_int(state->board[3][1], ==, 0);
+  munit_assert_uint(state->score, ==, 12);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_up_no_double_merge_single_move(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][1] = 2;
+  state->board[1][1] = 2;
+  state->board[2][1] = 2;
+
+  munit_assert_true(move(state, UP));
+  munit_assert_int(state->board[0][1], ==, 4);
+  munit_assert_int(state->board[1][1], ==, 2);
+  munit_assert_int(state->board[2][1], ==, 0);
+  munit_assert_int(state->board[3][1], ==, 0);
+  munit_assert_uint(state->score, ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_down_simple(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][2] = 2;
+  state->board[2][2] = 2;
+
+  munit_assert_true(move(state, DOWN));
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[2][2], ==, 0);
+  munit_assert_int(state->board[3][2], ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_down_through_gap(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][2] = 2;
+  state->board[2][2] = 2;
+
+  munit_assert_true(move(state, DOWN));
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[2][2], ==, 0);
+  munit_assert_int(state->board[3][2], ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_down_double_pair(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[0][2] = 2;
+  state->board[1][2] = 2;
+  state->board[2][2] = 4;
+  state->board[3][2] = 4;
+
+  munit_assert_true(move(state, DOWN));
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[2][2], ==, 4);
+  munit_assert_int(state->board[3][2], ==, 8);
+  munit_assert_uint(state->score, ==, 12);
+
+  return MUNIT_OK;
+}
+
+static MunitResult test_merge_down_no_double_merge_single_move(const MunitParameter params[], void *fixture) {
+  (void)params;
+  GameState_t *state = (GameState_t *)fixture;
+
+  state->board[1][2] = 2;
+  state->board[2][2] = 2;
+  state->board[3][2] = 2;
+
+  munit_assert_true(move(state, DOWN));
+  munit_assert_int(state->board[0][2], ==, 0);
+  munit_assert_int(state->board[1][2], ==, 0);
+  munit_assert_int(state->board[2][2], ==, 2);
+  munit_assert_int(state->board[3][2], ==, 4);
+  munit_assert_uint(state->score, ==, 4);
+
+  return MUNIT_OK;
+}
+
+static MunitTest tests[] = {
+    {(char *)"/merge/left/simple", test_merge_left_simple, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/left/through-gap", test_merge_left_through_gap, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/left/double-pair", test_merge_left_double_pair, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/left/no-double-merge", test_merge_left_no_double_merge_single_move, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/left/different-values-no-merge", test_move_left_no_merge_when_different_values, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/move/no-change", test_move_returns_false_when_nothing_changes, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/right/simple", test_merge_right_simple, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/right/through-gap", test_merge_right_through_gap, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/right/double-pair", test_merge_right_double_pair, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/right/no-double-merge", test_merge_right_no_double_merge_single_move, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/up/simple", test_merge_up_simple, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/up/through-gap", test_merge_up_through_gap, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/up/double-pair", test_merge_up_double_pair, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/up/no-double-merge", test_merge_up_no_double_merge_single_move, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/down/simple", test_merge_down_simple, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/down/through-gap", test_merge_down_through_gap, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/down/double-pair", test_merge_down_double_pair, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {(char *)"/merge/down/no-double-merge", test_merge_down_no_double_merge_single_move, test_setup, test_tear_down, MUNIT_TEST_OPTION_NONE, NULL},
+    {NULL, NULL, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL}};
+
+static const MunitSuite suite = {
+    (char *)"",
+    tests,
+    NULL,
+    1,
+    MUNIT_SUITE_OPTION_NONE,
+};
+
+int main(int argc, char *argv[MUNIT_ARRAY_PARAM(argc + 1)]) {
+  return munit_suite_main(&suite, NULL, argc, argv);
+}

ui.c

@@ -3,18 +3,94 @@
 #include <math.h>
 #include <raylib.h>
 #include <stdbool.h>
+#include <stdio.h>
+
+const Color tile_colors[] = {
+    LIGHTGRAY, // 0 - Empty
+    BEIGE,     // 2
+    GOLD,      // 4
+    ORANGE,    // 8
+    ORANGE,    // 16
+    RED,       // 32
+    MAROON,    // 64
+    YELLOW,    // 128
+    GOLD,      // 256
+    ORANGE,    // 512
+    RED,       // 1024
+    MAROON,    // 2048
+    PINK,      // 4096
+    MAGENTA,   // 8192
+};
 
 static bool is_dragging;
 static Vector2 drag_start_pos;
+static bool is_animating;
+
+// If there isn't a tile to animate then store it as {-1,-1}
+static Vector2 new_tile = {-1, 1};
+static float new_tile_animation_progress;
+
+typedef struct {
+  Vector2 from;
+  Vector2 to;
+  // We need to store this to know when to (show the) merge, if merging
+  Vector2 position;
+  int value;
+} animated_tile_t;
+
+static animated_tile_t animated_tiles[BOARD_WIDTH * BOARD_HEIGHT];
+
+// Common logic shared between both input handlers
+static void after_input(GameState_t *game_state) {
+  spawn_tile(game_state, &new_tile);
+  if (!can_move(game_state)) {
+    is_animating = false; // No more moves, so we won't be animating anymore
+    game_state->status = LOST;
+  } else {
+    // We moved, merged or spawned a tile, so we will be animating
+    is_animating = true;
+
+    // TODO: Allow for infinite play
+    for (int y = 0; y < BOARD_HEIGHT; y++) {
+      for (int x = 0; x < BOARD_WIDTH; x++) {
+        if (game_state->board[y][x] == 2048) {
+          game_state->status = WON;
+          return;
+        }
+      }
+    }
+  }
+
+  FILE *f = fopen("save.dat", "wb");
+  if (f) {
+    fwrite(game_state, sizeof(GameState_t), 1, f);
+    fclose(f);
+  }
+}
 
 void handle_mouse_input(GameState_t *game_state) {
+  // Don't allow any input while animating so we stay in sync
+  if (is_animating)
+    return;
+
   if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
     drag_start_pos = GetMousePosition();
+
+    // Check for the normal reset button
+    if (game_state->status == PLAYING) {
       if (drag_start_pos.x >= 500 && drag_start_pos.x <= 775 && drag_start_pos.y >= 455 && drag_start_pos.y <= 479) {
         reset_board(game_state);
         return;
       }
+    } else {
+      // Check for the "Play again" button
+      if (drag_start_pos.x >= 300 && drag_start_pos.x <= 500 && drag_start_pos.y >= 450 && drag_start_pos.y <= 490) {
+        reset_board(game_state);
+        return;
+      }
+    }
 
+    if (game_state->status == PLAYING)
       is_dragging = true;
   } else if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON) && is_dragging) {
     Vector2 current_pos = GetMousePosition();
@@ -39,9 +115,106 @@ void handle_mouse_input(GameState_t *game_state) {
           move(game_state, UP);
         }
       }
-      spawn_tile(game_state);
+      after_input(game_state);
     }
-
     is_dragging = false;
   }
 }
+
+void handle_keyboard_input(GameState_t *game_state) {
+  if (IsKeyReleased(KEY_R) || (game_state->status != PLAYING && IsKeyReleased(KEY_ENTER))) {
+    reset_board(game_state);
+  }
+
+  bool moved = false;
+  if (IsKeyReleased(KEY_UP)) {
+    moved = move(game_state, UP);
+  } else if (IsKeyReleased(KEY_DOWN)) {
+    moved = move(game_state, DOWN);
+  } else if (IsKeyReleased(KEY_LEFT)) {
+    moved = move(game_state, LEFT);
+  } else if (IsKeyReleased(KEY_RIGHT)) {
+    moved = move(game_state, RIGHT);
+  }
+
+  if (moved) {
+    after_input(game_state);
+  }
+}
+
+static void animate_new_tile() {
+  if (new_tile.x == -1 && new_tile.y == -1)
+    return;
+
+  new_tile_animation_progress += GetFrameTime() * 5;
+  if (new_tile_animation_progress >= 1.0f) {
+    new_tile_animation_progress = 0.0f;
+    new_tile = (Vector2){-1, -1}; // Reset after animation completes
+    is_animating = false;
+  }
+}
+
+// Main render loop, responsible ONLY for redering
+bool render(GameState_t *game_state) {
+  if (is_animating) {
+    animate_new_tile();
+  }
+
+  for (int y = 0; y < BOARD_HEIGHT; y++) {
+    for (int x = 0; x < BOARD_WIDTH; x++) {
+      int tile_value = game_state->board[y][x];
+      int pos_x = BOARD_MARGIN + x * (TILE_SIZE + TILE_SPACING);
+      int pos_y = BOARD_MARGIN + y * (TILE_SIZE + TILE_SPACING);
+      int color_index = (tile_value == 0) ? 0 : (int)log2(tile_value);
+
+      if ((size_t)color_index >= sizeof(tile_colors) / sizeof(tile_colors[0])) {
+        color_index = sizeof(tile_colors) / sizeof(tile_colors[0]) - 1; // Cap to the last color
+      }
+
+      if (is_animating && new_tile.x == x && new_tile.y == y) {
+        float scale = 1.0 - 0.2 * sin(new_tile_animation_progress * PI);
+        int scaled_size = (int)(TILE_SIZE * scale);
+        int offset = (TILE_SIZE - scaled_size) / 2;
+        DrawRectangle(pos_x + offset, pos_y + offset, scaled_size, scaled_size, tile_colors[color_index]);
+      } else {
+        DrawRectangle(pos_x, pos_y, TILE_SIZE, TILE_SIZE, tile_colors[color_index]);
+      }
+      if (tile_value != 0) {
+        const char *text = TextFormat("%d", tile_value);
+        DrawText(text, pos_x + TILE_SIZE / 2 - MeasureText(text, 20) / 2, pos_y + TILE_SIZE / 2 - 10, 20, BLACK);
+      }
+    }
+  }
+
+  DrawText(TextFormat("Score: %d", game_state->score), WINDOW_HEIGHT, BOARD_MARGIN, 20, BLACK);
+  DrawText(TextFormat("Moves used: %d", game_state->moves_made), WINDOW_HEIGHT, BOARD_MARGIN + 20, 20, BLACK);
+
+  DrawText("By Piotr Kozak", WINDOW_WIDTH - MeasureText("By Piotr Kozak", 16) - 10, WINDOW_HEIGHT - 24, 16, GRAY);
+  if (game_state->status == PLAYING) {
+    DrawText("Drag with the mouse to move tiles", 400 - MeasureText("Drag with the mouse to move tiles", 20) / 2,
+             WINDOW_HEIGHT - 40, 20, GRAY);
+
+    // Reset button
+    DrawRectangle(500, 455, 275, 24, RED);
+    DrawText("Reset", 500 + 275 / 2 - MeasureText("Reset", 20) / 2, 455 + 4, 20, WHITE);
+  } else {
+    Color overlay = Fade(BLACK, 0.7f);
+    DrawRectangle(0, 0, WINDOW_WIDTH, 700, overlay);
+
+    if (game_state->status == WON) {
+      DrawText("You win!", 400 - MeasureText("You win!", 40) / 2, 250, 40, GREEN);
+    } else if (game_state->status == LOST) {
+      DrawText("Game over!", 400 - MeasureText("Game over!", 40) / 2, 250, 40, RED);
+    }
+
+    // Draw the scores under the win/loss message
+    DrawText(TextFormat("Score: %d", game_state->score),
+             400 - MeasureText(TextFormat("Score: %d", game_state->score), 20) / 2, 290, 20, WHITE);
+    DrawText(TextFormat("Moves used: %d", game_state->moves_made),
+             400 - MeasureText(TextFormat("Moves used: %d", game_state->moves_made), 20) / 2, 310, 20, WHITE);
+
+    DrawRectangle(400 - 100, 450, 200, 40, RED);
+    DrawText("Try again", 400 - MeasureText("Try again", 20) / 2, 455 + 4, 20, WHITE);
+  }
+  return is_animating;
+}

ui.h

@@ -6,4 +6,9 @@
 #define TILE_SPACING 10
 #define BOARD_MARGIN 50
 
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+bool render(GameState_t *game_state);
 void handle_mouse_input(GameState_t *game_state);
+void handle_keyboard_input(GameState_t *game_state);