<?phpnamespace App\Level;use Evenement\EventEmitter;use App\Util\Assets;use App\Gfx\Gfx;use App\Stage\TileSet;class LevelManager extends EventEmitter{ /** The number of a level made in the site's editor in the original (not in this port). */ public const CUSTOM = 36; private array $levels = []; private int $currentLevelIndex = 0; public function __construct(private Gfx $sdl,private Assets $assetManager) { } public function getCurrentLevel(): Level { return $this->levels[$this->currentLevelIndex]; } public function nextLevel(): void { if ($this->currentLevelIndex < count($this->levels) - 1) { $this->currentLevelIndex++; $this->useCurrentTextures(); $this->emit('levelChanged', [$this->currentLevelIndex+1]); } } /** Jumps to a level by its number (Scrap Brain transporters). */ public function goToLevel(int $level): void { foreach ($this->levels as $index => $candidate) { if ($candidate->getLevel() === $level) { $this->currentLevelIndex = $index; $this->useCurrentTextures(); $this->emit('levelChanged', [$level]); return; } } } /** Back to the first level (game over / new game). */ public function firstLevel(): void { if ($this->currentLevelIndex !== 0) { $this->currentLevelIndex = 0; $this->useCurrentTextures(); $this->emit('levelChanged', [1]); } } public function previousLevel(): void { if ($this->currentLevelIndex > 0) { $this->currentLevelIndex--; $this->useCurrentTextures(); $this->emit('levelChanged', [$this->currentLevelIndex+1]); } } /** Only the blocks of the current level stay in memory: the others are freed, its own loaded now. */ private function useCurrentTextures(): void { $group = 'tileset' . $this->convertLevelToTileSet($this->getCurrentLevel()->getLevel()); $this->sdl->releaseGroupsExcept($group); $this->sdl->loadGroup($group); } public function convertLevelToTileSet($level) { $levelNTile[1] = 1 ; $levelNTile[2] = 2 ; $levelNTile[3] = 3 ; // green hill zone $levelNTile[4] = 4 ; $levelNTile[5] = 5 ; $levelNTile[6] = 6 ; // bridge $levelNTile[7] = 7 ; $levelNTile[8] = 8 ; $levelNTile[9] = 9 ; // jungle $levelNTile[10] = 10 ; $levelNTile[11] = 11 ; $levelNTile[12] = 12 ; // labyrinth // tileset13 ?? $levelNTile[13] = 14 ; $levelNTile[14] = 15 ; $levelNTile[15] = 16 ; // Scrap Brain Act 1 $levelNTile[16] = 18 ; $levelNTile[17] = 19 ; // Sky Base $levelNTile[18] = 26 ; // Skybase Boss $levelNTile[19] = 1 ; // $155A4–A5 18: End Sequence // From level 20 the files follow the ROM level index ($13 has no header): 20 = $14 ... 35 = $23. // $14-$19 are the Scrap Brain act 2 rooms reached by the transporters (same art / blocks as act 2). $levelNTile[20] = 15 ; // $14: Scrap Brain Act 2 (Emerald Maze), from corridor $levelNTile[21] = 15 ; // $15: Scrap Brain Act 2 (Ballhog Area) $levelNTile[22] = 15 ; // $16: Scrap Brain Act 2, from transporter $levelNTile[23] = 15 ; // $17: Scrap Brain Act 2 (Emerald Maze), from transporter $levelNTile[24] = 15 ; // $18: Scrap Brain Act 2, from Emerald Maze $levelNTile[25] = 15 ; // $19: Scrap Brain Act 2, from Ballhog Area $levelNTile[26] = 26 ; // $1A: Sky Base interior $levelNTile[27] = 27 ; // $1B: Sky Base interior // Bonus stages: tileset31 is the complete set decoded from the ROM (the ripped tileset30 stops at block 54, // which misses the ring background block 120 among others). for ($bonus = 28; $bonus <= 35; $bonus++) { $levelNTile[$bonus] = 31; } return $levelNTile[$level]; } public function loadLevels() { for ($i = 1 ; $i <= 35 ; $i++) { $tileSet = new TileSet($this->sdl); $tileSetFile = 'tileset/levels/tileset' . $this->convertLevelToTileSet($i); // the textures of a level are loaded when it is played (useCurrentTextures), grouped by file $group = 'tileset' . $this->convertLevelToTileSet($i); $tileSet->loadTileSet('tileset' . $i, $tileSetFile . '.png', $group); // Labyrinth: fixed underwater palette below the water line (tools/waterpalette.py) foreach (['', '-fg'] as $layer) { if (file_exists($this->assetManager->getAssetFolder() . '/' . $tileSetFile . '-water' . $layer . '.png')) { $this->sdl->registerTexture('tileset' . $i . $layer . '-water', $tileSetFile . '-water' . $layer . '.png', $group); } } // Palette-cycle steps generated from the ROM (water, waterfalls, lights...) for ($k = 0; file_exists($this->assetManager->getAssetFolder() . '/' . $tileSetFile . '-cycle' . $k . '.png'); $k++) { $tileSet->loadTileSet('tileset' . $i . '-cycle' . $k, $tileSetFile . '-cycle' . $k . '.png', $group); } // bonus stages: colour 14 white, the flash of the big bumpers (tools/bumperflash.py) if (file_exists($this->assetManager->getAssetFolder() . '/' . $tileSetFile . '-flash.png')) { $tileSet->loadTileSet('tileset' . $i . '-flash', $tileSetFile . '-flash.png', $group); } // Sky Base 1 lightning palettes (tools/lightning.py) $variants = ['', '-cycle0', '-cycle1', '-cycle2', '-cycle3', '-cycle4', '-cycle5', '-cycle6', '-cycle7']; foreach ([1, 2] as $light) { for ($k = 0; file_exists($this->assetManager->getAssetFolder() . '/' . $tileSetFile . '-light' . $light . '-cycle' . $k . '.png'); $k++) { $tileSet->loadTileSet('tileset' . $i . '-light' . $light . '-cycle' . $k, $tileSetFile . '-light' . $light . '-cycle' . $k . '.png', $group); $variants[] = '-light' . $light . '-cycle' . $k; } } // Foreground layers: priority blocks (solidity bit 7) drawn over the sprites, colour 0 left transparent. foreach ($variants as $variant) { if (file_exists($this->assetManager->getAssetFolder() . '/' . $tileSetFile . $variant . '-fg.png')) { $tileSet->loadTileSet('tileset' . $i . $variant . '-fg', $tileSetFile . $variant . '-fg.png', $group); } } $level = new Level($tileSet,$i,$this->sdl,$this->assetManager); $level->readLevelPositionTilesAndMeta(); // Initialize levels $this->levels[] = $level; } $this->useCurrentTextures(); $debug = 1 ; }}