Collision working but very very very slow

.gitignore

@@ -1,4 +1,5 @@
 .vscode/*
+.vs/*
 bin/*
 src/gfx/convpng.*
 screenshot.png

src/baddie.h

@@ -7,6 +7,11 @@ struct Baddie {
 		float x;
 		float y;
 	} pos;
+	struct oldPos
+	{
+		float x;
+		float y;
+	} oldPos;
 } baddies[baddieAmount];
 
 int spawnBaddie(float posX, float posY)
@@ -31,7 +36,12 @@ int updateBaddie(int i)
 		if (!(baddies[i].pos.x <= (0 - 32)))
 		{
 			baddies[i].pos.x -= speed;
-			gfx_Sprite(baddie, baddies[i].pos.x, baddies[i].pos.y);
+			if ((abs(baddies[i].oldPos.x - baddies[i].pos.x) >= 1) || (abs(baddies[i].oldPos.y - baddies[i].pos.y) >= 1))
+			{
+				gfx_Sprite(baddie, baddies[i].pos.x, baddies[i].pos.y);
+				baddies[i].oldPos.x = baddies[i].pos.x;
+				baddies[i].oldPos.y = baddies[i].pos.y;
+			}
 			return 1;
 		}
 		else

src/bullet.h

@@ -9,6 +9,11 @@ struct Bullet
 		float x;
 		float y;
 	} pos;
+	struct oldPos
+	{
+		float x;
+		float y;
+	} oldPos;
 } bullets[bulletAmount];
 
 int spawnBullet(float posX, float posY)
@@ -33,7 +38,12 @@ int updateBullet(int i)
 		if (!(bullets[i].pos.x >= (LCD_WIDTH + 16)))
 		{
 			bullets[i].pos.x += speed;
-			gfx_Sprite(bullet, bullets[i].pos.x, bullets[i].pos.y);
+			if ((abs(bullets[i].oldPos.x - bullets[i].pos.x) >= 1) || (abs(bullets[i].oldPos.y - bullets[i].pos.y) >= 1))
+			{
+				gfx_Sprite(bullet, bullets[i].pos.x, bullets[i].pos.y);
+				bullets[i].oldPos.x = bullets[i].pos.x;
+				bullets[i].oldPos.y = bullets[i].pos.y;
+			}
 			return 1;
 		}
 		else

src/collision.h

@@ -0,0 +1,40 @@
+// Variables for collision detection
+float distance = 0;
+float difference[2];
+int a;
+
+// Check collisions
+void checkCollision() {
+	for (i = 0; i < (baddieAmount - 1); i++)
+	{
+		// Collision baddie x bullet
+		for (a = 0; a < (bulletAmount - 1); a++)
+		{
+			//// Difference x
+			difference[0] = (baddies[i].pos.x + (32 / 2)) - (bullets[a].pos.x + (16 / 2));
+			//// Difference y
+			difference[1] = (baddies[i].pos.y + (32 / 2)) - (bullets[a].pos.y + (16 / 2));
+
+			// Calculate diffence
+			distance = sqrt(pow(difference[0], 2) + pow(difference[1], 2));
+			if (!baddies[i].dead && !bullets[a].dead && distance <= 11)
+			{
+				bullets[a].dead = true;
+				baddies[i].dead = true;
+			}
+		}
+
+		// Collision baddie x player
+		//// Difference x
+		difference[0] = (baddies[i].pos.x + (32 / 2)) - (player.pos.x + (32 / 2));
+		//// Difference y
+		difference[1] = (baddies[i].pos.y + (32 / 2)) - (player.pos.y + (32 / 2));
+
+		// Calculate diffence
+		distance = sqrt(pow(difference[0], 2) + pow(difference[1], 2));
+		if (!baddies[i].dead && distance <= 15)
+		{
+			// Gameover
+		}
+	}
+}

src/main.c

@@ -15,15 +15,19 @@
 
 // set global vars
 const int bulletAmount = 5;
-const int baddieAmount = 32;
+const int baddieAmount = 12;
 int spriteActive = 0;
+int gamestate = 0;
 float speed = 0.5;
 int i;
+float t;
+float dt;
 
 // Include entity headers
 #include "player.h"
 #include "bullet.h"
 #include "baddie.h"
+#include "collision.h"
 #include "controls.h"
 
 void setup()
@@ -32,8 +36,6 @@ void setup()
 
 	/* Initialize the 8bpp graphics */
 	gfx_Begin();
-	dbg_sprintf(dbgout, "This is the start of a CEmu debugging test\n");
-	dbg_Debugger();
 
 	/* Set up the palette for our sprites */
 	gfx_SetPalette(sprites_pal, sizeof_sprites_pal, 0);
@@ -92,6 +94,8 @@ void main(void)
 
 		}
 
+		checkCollision();
+
 		// Redraw player if position has changed or if a bullet has been fired
 		updatePlayer(spriteActive);
 

src/player.h

@@ -13,9 +13,9 @@ struct Player
 	} oldPos;
 } player;
 
-void updatePlayer(int bulletsAlive)
+void updatePlayer(int spriteActive)
 {
-	if ((abs(player.oldPos.x - player.pos.x) >= 1) || (abs(player.oldPos.y - player.pos.y) >= 1) || bulletsAlive == 1)
+	if ((abs(player.oldPos.x - player.pos.x) >= 1) || (abs(player.oldPos.y - player.pos.y) >= 1) || spriteActive == 1)
 	{
 		gfx_Sprite(spaceship, player.pos.x, player.pos.y);
 		player.oldPos.x = player.pos.x;