move boid drawing to separate function

compile_flags.txt

@@ -1,3 +1,4 @@
 -Idepends/raylib-cpp/include/
 -Idepends/raylib/src/
 -Idepends/raygui/src/
+-DRLGL_IMPLEMENTATION

src/world.cpp

@@ -742,6 +742,41 @@ static void draw_circle_sector(Vector2 center, float radius, float start_angle,
 	rlEnd();
 }
 
+static void draw_boids(World *world, Visuals *visuals) {
+	int boid_count = world->boids.size();
+
+	float boid_length = visuals->boid_edge_size * std::sqrt(3)/2;
+	float boid_width = visuals->boid_edge_size * 0.6;
+	Color color = visuals->boid_color;
+
+	rlBegin(RL_TRIANGLES);
+	for (int i = 0; i < boid_count; i++) {
+		Boid *boid = &world->boids[i];
+
+		Vector2 triangle[] = {
+			{  boid_length*2/3.0f, 0 },
+			{ -boid_length*1/3.0f, -boid_width/2 },
+			{ -boid_length*1/3.0f, boid_width/2 },
+		};
+		float facing = std::atan2(boid->dir.y, boid->dir.x);
+		float facing_cos = cos(facing);
+		float facing_sin = sin(facing);
+		for (int i = 0; i < 3; i++) {
+			Vector2 new_pos = boid->pos;
+			new_pos.x += triangle[i].x * facing_cos - triangle[i].y * facing_sin;
+			new_pos.y += triangle[i].x * facing_sin + triangle[i].y * facing_cos;
+			triangle[i] = new_pos;
+		}
+
+		rlColor4ub(color.r, color.g, color.b, color.a);
+		rlVertex2f(triangle[0].x, triangle[0].y);
+		rlVertex2f(triangle[1].x, triangle[1].y);
+		rlVertex2f(triangle[2].x, triangle[2].y);
+	}
+
+	rlEnd();
+}
+
 static void world_draw(World *world, Visuals *visuals) {
 	for (int i = 0; i < world->obstacles.size(); i++) {
 		draw_obstacle(&world->obstacles[i], GRAY);
@@ -761,32 +796,21 @@ static void world_draw(World *world, Visuals *visuals) {
 		}
 	}
 
-	float boid_length = visuals->boid_edge_size * std::sqrt(3)/2;
+	int boid_count = world->boids.size();
-	float boid_width = visuals->boid_edge_size * 0.6;
+	for (int i = 0; i < boid_count; i++) {
-	for (int i = 0; i < world->boids.size(); i++) {
 		Boid *boid = &world->boids[i];
-
 		if (visuals->draw_collision_avoidance_rays) {
 			draw_obstacle_avoidance_rays(visuals, world, boid);
 		}
-
 		if (visuals->draw_separation_radius) {
 			DrawCircleLines(boid->pos.x, boid->pos.y, world->separation_radius, MAGENTA);
 		}
+	}
 
-		Vector2 triangle[] = {
+	draw_boids(world, visuals);
-			{  boid_length*2/3.0f, 0 },
-			{ -boid_length*1/3.0f, -boid_width/2 },
-			{ -boid_length*1/3.0f, boid_width/2 },
-		};
-
-		float facing = std::atan2(boid->dir.y, boid->dir.x);
-		for (int i = 0; i < 3; i++) {
-			triangle[i] = Vector2Add(boid->pos, Vector2Rotate(triangle[i], facing));
-		}
-
-		DrawTriangle(triangle[0], triangle[1], triangle[2], visuals->boid_color);
 
+	for (int i = 0; i < boid_count; i++) {
+		Boid *boid = &world->boids[i];
 		if (visuals->draw_boid_direction) {
 			DrawCircle(boid->pos.x, boid->pos.y, visuals->boid_edge_size * 0.05, RED);
 			Vector2 look_pos = Vector2Add(boid->pos, vector2_mul_value(boid->dir, visuals->boid_edge_size*1.5));