ShitEngine
基于 C++20 与 SDL3 的轻量级 2D 游戏引擎
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RenderSystem.h
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1#pragma once
2#include "../Core/Core.h"
3#include "../Math.h"
4#include "ShitEngine/System/System.h"
5
6struct SDL_Renderer;
7
8namespace Shit {
9 class CameraComponent;
10 class RendererComponent;
11
18 class SHIT_API RenderSystem final : public System {
19 public:
20 RenderSystem(int priority = 100);
21 ~RenderSystem() override;
22
23 void update() override;
24 void destroy() override;
25
26 // 组件认领：RendererComponent + CameraComponent
27 bool onComponentAttached(Component* component) override;
28 void onComponentDetached(Component* component) override;
29
30 void registerRenderer(RendererComponent *renderer);
31 void unregisterRenderer(RendererComponent *renderer);
32 void registerCamera(CameraComponent *camera);
33 void unregisterCamera(CameraComponent *camera);
34
35 private:
36 void compactRenderers();
37 void compactCameras();
38
39 SDL_Renderer* m_renderer = nullptr;
40
41 std::vector<RendererComponent*> m_renderers;
42 bool m_isRenderersNeedSort = false;
43
44 std::vector<CameraComponent*> m_cameras;
45 bool m_isCamerasNeedSort = false;
46 };
47}
SHIT_API
#define SHIT_API
定义 Core.h:14
Shit::CameraComponent
相机组件，定义"从哪个角度观察世界"
定义 CameraComponent.h:16
Shit::Component
组件基类
定义 Component.h:20
Shit::RenderSystem::RenderSystem
RenderSystem(int priority=100)
Shit::RenderSystem::unregisterRenderer
void unregisterRenderer(RendererComponent *renderer)
注销渲染组件
Shit::RenderSystem::unregisterCamera
void unregisterCamera(CameraComponent *camera)
注销相机
Shit::RenderSystem::update
void update() override
每帧更新（纯虚）
Shit::RenderSystem::onComponentAttached
bool onComponentAttached(Component *component) override
组件挂载时调用。返回 true 表示本系统认领并处理了该组件（组件据此确定已注册）。
Shit::RenderSystem::onComponentDetached
void onComponentDetached(Component *component) override
组件卸下时调用。
Shit::RenderSystem::registerCamera
void registerCamera(CameraComponent *camera)
注册相机
Shit::RenderSystem::~RenderSystem
~RenderSystem() override
Shit::RenderSystem::registerRenderer
void registerRenderer(RendererComponent *renderer)
注册渲染组件
Shit::RenderSystem::destroy
void destroy() override
销毁（纯虚）
Shit::RendererComponent
渲染组件基类
定义 RendererComponent.h:18
Shit::System::System
System(int priority=0)
Shit
定义 AudioPlayer.h:10