From fabdc6e27bdb41042d7a530c5f2440ca5a330118 Mon Sep 17 00:00:00 2001
From: heavydemon21 <nielsstunnebrink1@gmail.com>
Date: Tue, 12 Nov 2024 19:52:11 +0100
Subject: Adjusted rendering so that now a gameobject can have multiple sprites
 with particles and another texture

---
 src/crepe/system/RenderSystem.cpp | 65 ++++++++++++++++++++++++++-------------
 src/crepe/system/RenderSystem.h   | 22 ++++++++-----
 src/example/rendering.cpp         |  1 +
 3 files changed, 60 insertions(+), 28 deletions(-)

diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 8bbf441..17a2337 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -7,10 +7,10 @@
 #include "../api/Transform.h"
 #include "../facade/SDLContext.h"
 #include "../util/log.h"
-#include "Particle.h"
-#include "api/ParticleEmitter.h"
-#include "api/Vector2.h"
+#include "../api/ParticleEmitter.h"
+#include "../api/Vector2.h"
 
+#include "Particle.h"
 #include "RenderSystem.h"
 
 using namespace crepe;
@@ -43,38 +43,61 @@ void RenderSystem::update_camera() {
 	}
 }
 
+bool RenderSystem::render_particle(const Sprite & sprite,
+								   const Transform & tm) {
 
-void RenderSystem::render_particle(const ParticleEmitter& em, Transform & tm){
-	if (!em.active) return;
-	
+	ComponentManager & mgr = ComponentManager::get_instance();
 	SDLContext & render = SDLContext::get_instance();
-	for (const Particle& p  : em.data.particles) {
-		if (!p.active) continue;
-		tm.position = p.position;
-		tm.rotation = p.angle;
-		render.draw(em.data.sprite, tm , *curr_cam);
+
+	auto emitters = mgr.get_components_by_id<ParticleEmitter>(sprite.game_object_id);
+
+	bool rendering_particles = false;
+
+	Transform tmp(0, Vector2{0, 0}, 0, 0);
+	tmp.scale = tm.scale;
+	for (const ParticleEmitter & em : emitters) {
+		if (!em.active) continue;
+		if (!(em.data.sprite.game_object_id == sprite.game_object_id)) continue;
+
+		rendering_particles = true;
+
+		for (const Particle & p : em.data.particles) {
+			if (!p.active) continue;
+			tmp.position = p.position;
+			tmp.rotation = p.angle;
+			render.draw(em.data.sprite, tmp, *curr_cam);
+		}
 	}
+	return rendering_particles;
 }
-void RenderSystem::render_sprites() {
+void RenderSystem::render_normal(const Sprite & sprite, const Transform & tm) {
 
 	ComponentManager & mgr = ComponentManager::get_instance();
+	SDLContext & render = SDLContext::get_instance();
+	
+	render.draw(sprite, tm, *curr_cam);
+}
 
-	auto emitter = mgr.get_components_by_type<ParticleEmitter>();
+void RenderSystem::render() {
 
-	SDLContext & render = SDLContext::get_instance();
-	Transform test(1, Vector2{0,0},0,0);
+	ComponentManager & mgr = ComponentManager::get_instance();
+
+	auto sprites = mgr.get_components_by_type<Sprite>();
+	for (const Sprite & sprite : sprites) {
+		if (!sprite.active) continue;
+		auto transform = mgr.get_components_by_id<Transform>(sprite.game_object_id);
+
+		bool rendered_particles = this->render_particle(sprite, transform[0].get());
+
+		if (rendered_particles) continue;
 
-	for (const ParticleEmitter & em : emitter) {
-		auto transforms
-			= mgr.get_components_by_id<Transform>(em.game_object_id);
-		test.scale = transforms[0].get().scale;
-		this->render_particle(em, test);
+		this->render_normal(sprite, transform[0].get());
 	}
 }
 
 void RenderSystem::update() {
 	this->clear_screen();
 	this->update_camera();
-	this->render_sprites();
+	this->render();
 	this->present_screen();
 }
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index 8dd8b7e..468f79b 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -1,10 +1,10 @@
 #pragma once
 
 #include "api/Camera.h"
+#include "api/Sprite.h"
+#include "api/Transform.h"
 
 #include "System.h"
-#include "api/ParticleEmitter.h"
-#include "api/Transform.h"
 
 namespace crepe {
 
@@ -45,14 +45,22 @@ private:
 	//! Updates the active camera used for rendering.
 	void update_camera();
 
-	//! Renders all active sprites to the screen.
-	void render_sprites() ;
-	
-	void render_particle(const ParticleEmitter& em, Transform & tm);
+	//! Renders the whole screen
+	void render();
+
+	/**
+	 * \brief Renders all the particles on the screen from a given sprite.
+	 *
+	 * \param sprite renders the particles with given texture
+	 * \param tm the Transform component for scale
+	 * \return true if particles have been rendered
+	 */
+	bool render_particle(const Sprite &, const Transform & tm);
+
+	void render_normal(const Sprite &, const Transform & tm);
 
 	/**
 	 * \todo Include color handling for sprites.
-	 * \todo Implement particle emitter rendering with sprites.
 	 * \todo Add text rendering using SDL_ttf for text components.
 	 * \todo Implement a text component and a button component.
 	 * \todo Ensure each sprite is checked for active status before rendering.
diff --git a/src/example/rendering.cpp b/src/example/rendering.cpp
index e02f6a3..a7cb5d6 100644
--- a/src/example/rendering.cpp
+++ b/src/example/rendering.cpp
@@ -35,6 +35,7 @@ int main() {
 	{
 		Color color(0, 0, 0, 0);
 		obj1.add_component<Sprite>(make_shared<Texture>("../asset/texture/second.png"), color, FlipSettings{true, true});
+		obj1.add_component<Sprite>(make_shared<Texture>("../asset/texture/second.png"), color, FlipSettings{true, true});
 	}
 
 	/*
-- 
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