feat: add custom background rendering and speed scaling features for snake gameplay

source/main.cpp

@@ -8,6 +8,7 @@
 #include <game_render.h>
 #include <game_audio.h>
 #include <game_input.h>
+#include <game_bg.h>
 
 #include "tilemap.h"
 
@@ -28,6 +29,7 @@ volatile uint16_t &snakelength = gameState.snakelength;
  ***/
 volatile uint16_t &snakeDirection = gameState.snakeDirection;
 volatile uint16_t &score = gameState.score;
+volatile uint16_t &applesEaten = gameState.applesEaten;
 
 bool &gameOver = gameState.gameOver;
 bool &paused = gameState.paused;
@@ -46,6 +48,7 @@ int sound;
 AudioContext audioContext;
 
 RenderAssets renderAssets;
+BackgroundContext bgContext;
 
 const void * get_sprite_pointer(uint16_t spriteIndex) {
 	return &tilemapTiles[spriteIndex*16];
@@ -64,8 +67,11 @@ void setup() {
 	consoleInit(&bottomScreen, 3,BgType_Text4bpp, BgSize_T_256x256, X_MAX, 0, false, true);
 	oamInit(&oamSub, SpriteMapping_1D_32, false);
 
+	bg_setup(bgContext, topScreen.bgId, bottomScreen.bgId);
+
 	renderAssets.topScreen = &topScreen;
 	renderAssets.bottomScreen = &bottomScreen;
+	renderAssets.bg_context = &bgContext;
 
 	renderAssets.gfx_segment = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
 	renderAssets.gfx_segment_small = oamAllocateGfx(&oamSub, SpriteSize_8x8, SpriteColorFormat_256Color);
@@ -127,6 +133,7 @@ void setup() {
 }
 void handle_vblank() {
 	frame++;
+	bg_update(bgContext, gameState, frame);
 	if (gameState.scene == Scene::Playing) {
 		consoleSelect(&topScreen);
 		draw_stats(gameState, renderAssets, internals, audio_is_music_enabled(audioContext), frame);
@@ -151,6 +158,8 @@ void do_tick() {
 			check_collision_self(gameState);
 			if (check_collision_apples(gameState)) {
 				audio_play_pickup(audioContext);
+				bg_trigger_pulse(bgContext);
+				timerStart(0, ClockDivider_1024, calculate_timer_reload(gameState), do_tick);
 			}
 			if (check_collision_apples_rotten(gameState)) {
 				audio_play_boom(audioContext);
@@ -173,10 +182,11 @@ void do_tick() {
 }
 	
 void init_game() {
-	
+	applesEaten = 0;
 	if (hardMode) {
-		timerStart(0, ClockDivider_1024, static_cast<uint16_t>(TIMER_FREQ_1024(9)), do_tick);
-		setBackdropColorSub(RGB15(10,5,5));
+		timerStart(0, ClockDivider_1024, calculate_timer_reload(gameState), do_tick);
+		setBackdropColorSub(RGB15(8, 3, 3));
+		setBackdropColor(RGB15(6, 2, 2));
 		score = 0;
 		snakelength = START_LENGTH_HARD;
 		snake = { {2,1,1}, {1,1,1} };
@@ -197,8 +207,9 @@ void init_game() {
 	} 
 	else
 	{
-		timerStart(0, ClockDivider_1024, static_cast<uint16_t>(TIMER_FREQ_1024(5)), do_tick);
-		setBackdropColorSub(RGB15(5,5,5));
+		timerStart(0, ClockDivider_1024, calculate_timer_reload(gameState), do_tick);
+		setBackdropColorSub(RGB15(3, 4, 7));
+		setBackdropColor(RGB15(2, 3, 6));
 		score = 0;
 		snakelength = START_LENGTH;
 		snake = { {4,1,1}, {3,1,1}, {2,1,1}, {1,1,1} };
@@ -215,9 +226,6 @@ void init_game() {
 		oamClear(&oamSub,0,128);
 		audio_start_music(audioContext);
 	}
-	
-	
-	 
 }
 
 int main(void) {
@@ -226,6 +234,8 @@ int main(void) {
 	irqSet(IRQ_VBLANK, handle_vblank);
 
 	setup();
+	setBackdropColor(RGB15(2, 2, 6));
+	setBackdropColorSub(RGB15(2, 2, 6));
 	draw_menu(gameState, renderAssets, audio_is_music_enabled(audioContext));
 
 	InputContext inputContext;