From 21f5b66d0bcc13d903800adf3bb614e380ff8591 Mon Sep 17 00:00:00 2001
From: heavydemon21 <nielsstunnebrink1@gmail.com>
Date: Thu, 14 Nov 2024 15:01:26 +0100
Subject: first part sorted still needing testing

---
 src/crepe/system/RenderSystem.cpp | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

(limited to 'src/crepe/system/RenderSystem.cpp')

diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 10211a3..718036c 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -1,3 +1,5 @@
+#include <algorithm>
+#include <cassert>
 #include <functional>
 #include <vector>
 
@@ -6,6 +8,7 @@
 #include "../api/Transform.h"
 #include "../facade/SDLContext.h"
 #include "../util/log.h"
+#include "Asset.h"
 
 #include "RenderSystem.h"
 
@@ -29,7 +32,6 @@ void RenderSystem::present_screen() const {
 }
 void RenderSystem::update_camera() {
 	ComponentManager & mgr = ComponentManager::get_instance();
-
 	std::vector<std::reference_wrapper<Camera>> cameras
 		= mgr.get_components_by_type<Camera>();
 
@@ -38,15 +40,38 @@ void RenderSystem::update_camera() {
 		this->curr_cam = &cam;
 	}
 }
-void RenderSystem::render_sprites() const {
+
+std::vector<std::reference_wrapper<Sprite>>
+RenderSystem::sort(std::vector<std::reference_wrapper<Sprite>> & objs) {
+	if (objs.empty()) return {};
+
+	std::vector<std::reference_wrapper<Sprite>> sorted_objs;
+	sorted_objs.insert(sorted_objs.end(), objs.begin(), objs.end());
+	assert(sorted_objs.size() != objs.size());
+
+	std::sort(sorted_objs.begin(), sorted_objs.end(),
+			  [](const std::reference_wrapper<Sprite> & a,
+				 const std::reference_wrapper<Sprite> & b) {
+				  const Sprite & sprite_a = a.get();
+				  const Sprite & sprite_b = b.get();
+				  if (sprite_a.sorting_in_layer == sprite_b.sorting_in_layer) {
+					  return sprite_a.order_in_layer < sprite_b.order_in_layer;
+				  }
+				  return sprite_a.sorting_in_layer < sprite_b.sorting_in_layer;
+			  });
+	return sorted_objs;
+}
+
+void RenderSystem::render_sprites() {
 
 	ComponentManager & mgr = ComponentManager::get_instance();
 
-	std::vector<std::reference_wrapper<Sprite>> sprites
-		= mgr.get_components_by_type<Sprite>();
+	auto sprites = mgr.get_components_by_type<Sprite>();
 
+	auto sorted_sprites = this->sort(sprites);
+	
 	SDLContext & render = SDLContext::get_instance();
-	for (const Sprite & sprite : sprites) {
+	for (const Sprite & sprite : sorted_sprites) {
 		auto transforms
 			= mgr.get_components_by_id<Transform>(sprite.game_object_id);
 		render.draw(sprite, transforms[0], *curr_cam);
-- 
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