feat: add temporary hazardous barriers in hard mode

source/main.cpp

@@ -85,6 +85,8 @@ void setup() {
 	renderAssets.gfx_tail_v[1] = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
 	renderAssets.gfx_apple_rotten = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
 	renderAssets.gfx_apple_cursed = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
+	renderAssets.gfx_barrier = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
+	renderAssets.gfx_barrier_warn = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
 
 	dmaCopy(get_sprite_pointer(1), renderAssets.gfx_segment, 64);
 	dmaCopy(get_sprite_pointer(2), renderAssets.gfx_segment_small, 64);
@@ -109,6 +111,12 @@ void setup() {
 	SPRITE_PALETTE_SUB[CURSE_PAL_CORE]    = RGB15(31, 26, 31); // Glowing White-Pink Core
 	SPRITE_PALETTE_SUB[CURSE_PAL_LEAF]    = RGB15(2, 31, 10);  // Toxic Radioactive Neon Green
 
+	// Setup initial colors for the hard-mode temporary fatal barriers
+	SPRITE_PALETTE_SUB[BARRIER_PAL_EDGE]   = RGB15(12, 0, 3);
+	SPRITE_PALETTE_SUB[BARRIER_PAL_FILL]   = RGB15(22, 2, 4);
+	SPRITE_PALETTE_SUB[BARRIER_PAL_STRIPE] = RGB15(31, 22, 6);
+	SPRITE_PALETTE_SUB[BARRIER_PAL_WARN]   = RGB15(18, 4, 2);
+
 	// 8x8 256-color tile data for Cursed Apple (vibrant electric purple apple with radioactive green horn & glowing core)
 	static const uint32_t CURSED_APPLE_TILE[16] = {
 		0x10000000, 0x00001414,
@@ -121,11 +129,47 @@ void setup() {
 		0x10100000, 0x00101000,
 	};
 
+	// 8x8 256-color tile data for solid fatal barrier (bordered hazard stripe block)
+	static const uint32_t BARRIER_SOLID_TILE[16] = {
+		0x15151515, 0x15151515,
+		0x16171715, 0x15171716,
+		0x16161715, 0x15161717,
+		0x17161615, 0x15161617,
+		0x17171615, 0x15171616,
+		0x16171715, 0x15171716,
+		0x16161715, 0x15161717,
+		0x15151515, 0x15151515,
+	};
+
+	// 8x8 256-color tile data for barrier warning announcement (pulsing reticle frame)
+	static const uint32_t BARRIER_WARN_TILE[16] = {
+		0x00001818, 0x18180000,
+		0x18000018, 0x18000018,
+		0x18180000, 0x00001818,
+		0x00181800, 0x00181800,
+		0x00181800, 0x00181800,
+		0x18180000, 0x00001818,
+		0x18000018, 0x18000018,
+		0x00001818, 0x18180000,
+	};
+
 	// Copy cursed apple tile directly into allocated VRAM (32 halfwords)
-	auto *destAppleCursed = static_cast<uint16_t *>(renderAssets.gfx_apple_cursed);
-	const auto *srcAppleCursed = reinterpret_cast<const uint16_t *>(CURSED_APPLE_TILE);
+	auto *dest_apple_cursed = static_cast<uint16_t *>(renderAssets.gfx_apple_cursed);
+	const auto *src_apple_cursed = reinterpret_cast<const uint16_t *>(CURSED_APPLE_TILE);
 	for (size_t i = 0; i < 32; i++) {
-		destAppleCursed[i] = srcAppleCursed[i];
+		dest_apple_cursed[i] = src_apple_cursed[i];
+	}
+
+	auto *dest_barrier = static_cast<uint16_t *>(renderAssets.gfx_barrier);
+	const auto *src_barrier = reinterpret_cast<const uint16_t *>(BARRIER_SOLID_TILE);
+	for (size_t i = 0; i < 32; i++) {
+		dest_barrier[i] = src_barrier[i];
+	}
+
+	auto *dest_barrier_warn = static_cast<uint16_t *>(renderAssets.gfx_barrier_warn);
+	const auto *src_barrier_warn = reinterpret_cast<const uint16_t *>(BARRIER_WARN_TILE);
+	for (size_t i = 0; i < 32; i++) {
+		dest_barrier_warn[i] = src_barrier_warn[i];
 	}
 
 	audio_setup(audioContext);
@@ -137,6 +181,10 @@ void handle_vblank() {
 	if (gameState.scene == Scene::Playing) {
 		consoleSelect(&topScreen);
 		draw_stats(gameState, renderAssets, internals, audio_is_music_enabled(audioContext), frame);
+		if (!gameState.paused) {
+			tick_barriers_frame(gameState);
+		}
+		draw_barriers(gameState, renderAssets, frame);
 	}
 
 	// Dynamic pulsing radioactive glow for Cursed Apples (smooth 60fps breathing)
@@ -157,7 +205,7 @@ void do_tick() {
 	if (gameState.scene == Scene::Playing && !paused) {
 		ticks++;
 		if (!gameOver){
-			const bool wasGameOver = gameOver;
+			const bool was_game_over = gameOver;
 			
 			/*if (hardMode) {
 				timerStop(0);
@@ -167,6 +215,9 @@ void do_tick() {
 			update_snake(gameState);
 			audio_play_plop(audioContext);
 			check_collision_self(gameState);
+			if (check_collision_barriers(gameState)) {
+				audio_play_boom(audioContext);
+			}
 			if (check_collision_apples(gameState)) {
 				audio_play_pickup(audioContext);
 				bg_trigger_pulse(bgContext);
@@ -181,8 +232,9 @@ void do_tick() {
 			spawn_apples(gameState);
 			spawn_apples_rotten(gameState);
 			spawn_apples_cursed(gameState);
+			spawn_barriers(gameState);
 			tick_status_effects(gameState);
-			if (!wasGameOver && gameOver) {
+			if (!was_game_over && gameOver) {
 				audio_stop_music();
 				audio_play_fail(audioContext);
 			}
@@ -194,6 +246,7 @@ void do_tick() {
 	
 void init_game() {
 	applesEaten = 0;
+	reset_barriers(gameState);
 	if (hardMode) {
 		timerStart(0, ClockDivider_1024, calculate_timer_reload(gameState), do_tick);
 		setBackdropColorSub(RGB15(8, 3, 3));