跟着cherno手搓游戏引擎【22】CameraController

前置：

YOTO.h: 

#pragma once

//用于YOTO APP

#include "YOTO/Application.h"
#include"YOTO/Layer.h"
#include "YOTO/Log.h"

#include"YOTO/Core/Timestep.h"

#include"YOTO/Input.h"
#include"YOTO/KeyCode.h"
#include"YOTO/MouseButtonCodes.h"
#include "YOTO/OrthographicCameraController.h"

#include"YOTO/ImGui/ImGuiLayer.h"

//Renderer
#include"YOTO/Renderer/Renderer.h"
#include"YOTO/Renderer/RenderCommand.h"

#include"YOTO/Renderer/Buffer.h"
#include"YOTO/Renderer/Shader.h"
#include"YOTO/Renderer/Texture.h"
#include"YOTO/Renderer/VertexArray.h"

#include"YOTO/Renderer/OrthographicCamera.h"



//入口点
#include"YOTO/EntryPoint.h"

 添加方法：

OrthographicCamera.h:

#pragma once
#include 
namespace YOTO {
	class OrthographicCamera
	{
	public:
		OrthographicCamera(float left, float right, float bottom, float top);

		void SetProjection(float left, float right, float bottom, float top);

		const glm::vec3& GetPosition()const { return m_Position; }
		void SetPosition(const glm::vec3& position) {
			m_Position = position;
			RecalculateViewMatrix();
		}

		float GetRotation()const { return m_Rotation; }
		void SetRotation(float rotation) {
			m_Rotation = rotation;
			RecalculateViewMatrix();
		}

		const glm::mat4& GetProjectionMatrix()const { return m_ProjectionMatrix; }
		const glm::mat4& GetViewMatrix()const { return m_ViewMatrix; }
		const glm::mat4& GetViewProjectionMatrix()const { return m_ViewProjectionMatrix; }
	private:
		void RecalculateViewMatrix();
	private:
		glm::mat4 m_ProjectionMatrix;
		glm::mat4 m_ViewMatrix;
		glm::mat4 m_ViewProjectionMatrix;
		glm::vec3 m_Position = { 0.0f ,0.0f ,0.0f };
		float m_Rotation = 0.0f;

	};

}

OrthographicCamera.cpp:

#include "ytpch.h"
#include "OrthographicCamera.h"
#include 
namespace YOTO {
	OrthographicCamera::OrthographicCamera(float left, float right, float bottom, float top)
		:m_ProjectionMatrix(glm::ortho(left, right, bottom, top)), m_ViewMatrix(1.0f)
	{
		m_ViewProjectionMatrix = m_ProjectionMatrix * m_ViewMatrix;
	}

	void OrthographicCamera::SetProjection(float left, float right, float bottom, float top) {
		m_ProjectionMatrix = glm::ortho(left, right, bottom, top);
		m_ViewProjectionMatrix = m_ProjectionMatrix * m_ViewMatrix;
	}
	void OrthographicCamera::RecalculateViewMatrix()
	{
		glm::mat4 transform = glm::translate(glm::mat4(1.0f), m_Position) *
			glm::rotate(glm::mat4(1.0f), glm::radians(m_Rotation), glm::vec3(0, 0, 1));
		m_ViewMatrix = glm::inverse(transform);
		m_ViewProjectionMatrix = m_ProjectionMatrix * m_ViewMatrix;
	}
}

封装控制类：

OrthographicCameraController.h: 

#pragma once
#include "YOTO/Renderer/OrthographicCamera.h"
#include"YOTO/Core/Timestep.h"
#include "YOTO/Event/ApplicationEvent.h"
#include "YOTO/Event/MouseEvent.h"
namespace YOTO {
	class OrthographicCameraController {
	public:
		OrthographicCameraController(float aspectRatio, bool rotation=false );//0,1280
		void OnUpdate(Timestep ts);
		void OnEvent(Event& e);
		OrthographicCamera& GetCamera() {
			return m_Camera
				;
		}
		const OrthographicCamera& GetCamera()const  {
			return m_Camera
				;
		}

	private:
		bool OnMouseScrolled(MouseScrolledEvent &e);
		bool OnWindowResized(WindowResizeEvent& e);
	private:

		float m_AspectRatio;//横纵比
		float m_ZoomLevel = 1.0f;
		OrthographicCamera m_Camera;

		bool m_Rotation;

		glm::vec3 m_CameraPosition = {0.0f,0.0f,0.0f};
		float m_CameraRotation = 0.0f;
		float m_CameraTranslationSpeed = 1.0f, m_CameraRotationSpeed = 180.0f;
	};
}

 OrthographicCameraController.cpp: 

#include "ytpch.h"
#include "OrthographicCameraController.h"
#include"YOTO/Input.h"
#include 
namespace YOTO {

	OrthographicCameraController::OrthographicCameraController(float aspectRatio, bool rotation)
		:m_AspectRatio(aspectRatio),m_Camera(-m_AspectRatio*m_ZoomLevel,m_AspectRatio*m_ZoomLevel,-m_ZoomLevel,m_ZoomLevel),m_Rotation(rotation)
	{

	}

	 
	void OrthographicCameraController::OnUpdate(Timestep ts)
	{
		if (Input::IsKeyPressed(YT_KEY_A)) {
			m_CameraPosition.x -= m_CameraTranslationSpeed * ts;
		}
		else if (Input::IsKeyPressed(YT_KEY_D)) {
			m_CameraPosition.x += m_CameraTranslationSpeed * ts;
		}
		if (Input::IsKeyPressed(YT_KEY_S)) {
			m_CameraPosition.y -= m_CameraTranslationSpeed * ts;
		}
		else if (Input::IsKeyPressed(YT_KEY_W)) {
			m_CameraPosition.y += m_CameraTranslationSpeed * ts;
		}
		if (m_Rotation) {
			if (Input::IsKeyPressed(YT_KEY_Q)) {
				m_CameraRotation += m_CameraRotationSpeed * ts;
			}
			else if (Input::IsKeyPressed(YT_KEY_E)) {
				m_CameraRotation -= m_CameraRotationSpeed * ts;
			}
			m_Camera.SetRotation(m_CameraRotation);
		}
		m_Camera.SetPosition(m_CameraPosition);
		m_CameraTranslationSpeed = m_ZoomLevel;
		}

	
	void OrthographicCameraController::OnEvent(Event& e)
	{
		EventDispatcher dispatcher(e);
		dispatcher.Dispatch(YT_BIND_EVENT_FN(OrthographicCameraController::OnMouseScrolled));
		dispatcher.Dispatch(YT_BIND_EVENT_FN(OrthographicCameraController::OnWindowResized));
	}
	bool OrthographicCameraController::OnMouseScrolled(MouseScrolledEvent& e)
	{
		m_ZoomLevel -= e.GetYOffset()*0.5f;
		m_ZoomLevel = std::max(m_ZoomLevel, 0.25f);
		m_Camera.SetProjection(-m_AspectRatio * m_ZoomLevel, m_AspectRatio * m_ZoomLevel, -m_ZoomLevel, m_ZoomLevel);
		return false;
	}
	bool OrthographicCameraController::OnWindowResized(WindowResizeEvent& e)
	{
		m_AspectRatio = (float)e.GetWidth()/(float) e.GetHeight();
		m_Camera.SetProjection(-m_AspectRatio * m_ZoomLevel, m_AspectRatio * m_ZoomLevel, -m_ZoomLevel, m_ZoomLevel);
		return false;
	}
}

SandboxApp.cpp:

#include
#include "imgui/imgui.h"
#include
#include 
#include 
#include 


class ExampleLayer:public YOTO::Layer
{
public:
	ExampleLayer()
	:Layer("Example"),  m_CameraController(1280.0f/720.0f,true){
		uint32_t indices[3] = { 0,1,2 };
		float vertices[3 * 7] = {
			-0.5f,-0.5f,0.0f, 0.8f,0.2f,0.8f,1.0f,
			0.5f,-0.5f,0.0f,  0.2f,0.3f,0.8f,1.0f,
			0.0f,0.5f,0.0f,   0.8f,0.8f,0.2f,1.0f,
		};

		m_VertexArray.reset(YOTO::VertexArray::Create());


		YOTO::Ref m_VertexBuffer;
		m_VertexBuffer.reset(YOTO::VertexBuffer::Create(vertices, sizeof(vertices)));

		{
			YOTO::BufferLayout setlayout = {

	{YOTO::ShaderDataType::Float3,"a_Position"},
		{YOTO::ShaderDataType::Float4,"a_Color"}
			};
			m_VertexBuffer->SetLayout(setlayout);

		}

		m_VertexArray->AddVertexBuffer(m_VertexBuffer);


		YOTO::Refm_IndexBuffer;
		m_IndexBuffer.reset(YOTO::IndexBuffer::Create(indices, sizeof(indices) / sizeof(uint32_t)));

		m_VertexArray->AddIndexBuffer(m_IndexBuffer);

		std::string vertexSource = R"(
		#version 330 core
		layout(location = 0) in vec3 a_Position;
		layout(location = 1) in vec4 a_Color;
		uniform mat4 u_ViewProjection;
		uniform mat4 u_Transform;
		out vec3 v_Position;
		out vec4 v_Color;
		void main(){
		v_Position=a_Position;
		v_Color=a_Color;
		gl_Position =u_ViewProjection *u_Transform* vec4( a_Position,1.0);
		}
		)";
		//绘制颜色
		std::string fragmentSource = R"(
		#version 330 core
		layout(location = 0) out vec4 color;
		in vec3 v_Position;
		in vec4 v_Color;
		void main(){
		color=vec4(v_Color);
		}
		)";
		m_Shader=(YOTO::Shader::Create("VertexPosColor", vertexSource, fragmentSource));

		///测试/

		m_SquareVA.reset(YOTO::VertexArray::Create());

		float squareVertices[5 * 4] = {
			-0.5f,-0.5f,0.0f, 0.0f,0.0f,
			0.5f,-0.5f,0.0f,  1.0f,0.0f,
			0.5f,0.5f,0.0f,   1.0f,1.0f,
			-0.5f,0.5f,0.0f,  0.0f,1.0f,
		};
		YOTO::Ref squareVB;
		squareVB.reset(YOTO::VertexBuffer::Create(squareVertices, sizeof(squareVertices)));
		squareVB->SetLayout({
			{YOTO::ShaderDataType::Float3,"a_Position"},
				{YOTO::ShaderDataType::Float2,"a_TexCoord"}
			});
		m_SquareVA->AddVertexBuffer(squareVB);
		uint32_t squareIndices[6] = { 0,1,2,2,3,0 };
		YOTO::Ref squareIB;

		squareIB.reset((YOTO::IndexBuffer::Create(squareIndices, sizeof(squareIndices) / sizeof(uint32_t))));

		m_SquareVA->AddIndexBuffer(squareIB);

		//测试：
		std::string BlueShaderVertexSource = R"(
		#version 330 core
		layout(location = 0) in vec3 a_Position;
		uniform mat4 u_ViewProjection;
		uniform mat4 u_Transform;

		out vec3 v_Position;
		void main(){
		v_Position=a_Position;
		gl_Position =u_ViewProjection*u_Transform*vec4( a_Position,1.0);
		}
		)";
		//绘制颜色
		std::string BlueShaderFragmentSource = R"(
		#version 330 core
		layout(location = 0) out vec4 color;

		in vec3 v_Position;
		uniform vec3 u_Color;
		void main(){
		color=vec4(u_Color,1.0);
		}
		)";
		m_BlueShader=(YOTO::Shader::Create("FlatColor", BlueShaderVertexSource, BlueShaderFragmentSource));

	auto textureShader=	m_ShaderLibrary.Load("assets/shaders/Texture.glsl");
		m_Texture=YOTO::Texture2D::Create("assets/textures/Checkerboard.png");
		m_ChernoLogo= YOTO::Texture2D::Create("assets/textures/ChernoLogo.png");
		std::dynamic_pointer_cast(textureShader)->Bind();
		std::dynamic_pointer_cast(textureShader)->UploadUniformInt("u_Texture", 0);
	}
	void OnImGuiRender() override {
		ImGui::Begin("设置");
		ImGui::ColorEdit3("正方形颜色", glm::value_ptr(m_SquareColor));
		ImGui::End();
	}
	void OnUpdate(YOTO::Timestep ts)override {
		//update
		m_CameraController.OnUpdate(ts);
		//YT_CLIENT_TRACE("delta time {0}s ({1}ms)", ts.GetSeconds(), ts.GetMilliseconds());
	

	
		//Render
		YOTO::RenderCommand::SetClearColor({ 0.2f, 0.2f, 0.2f, 1.0f });
		YOTO::RenderCommand::Clear();

		YOTO::Renderer::BeginScene(m_CameraController.GetCamera());
		{
			static glm::mat4 scale = glm::scale(glm::mat4(1.0f), glm::vec3(0.1f)); 
			glm::vec4  redColor(0.8f, 0.3f, 0.3f, 1.0f);
			glm::vec4  blueColor(0.2f, 0.3f, 0.8f, 1.0f);

	/*		YOTO::MaterialRef material = new YOTO::MaterialRef(m_FlatColorShader);
			YOTO::MaterialInstaceRef mi = new YOTO::MaterialInstaceRef(material);
			mi.setValue("u_Color",redColor);
			mi.setTexture("u_AlbedoMap", texture);
			squreMesh->SetMaterial(mi);*/

			std::dynamic_pointer_cast(m_BlueShader)->Bind();
			std::dynamic_pointer_cast(m_BlueShader)->UploadUniformFloat3("u_Color",m_SquareColor);
			for (int y = 0; y < 20; y++) {
				for (int x = 0; x <20; x++)
				{

					glm::vec3 pos(x * 0.105f,y* 0.105f, 0.0);
					glm::mat4 transform = glm::translate(glm::mat4(1.0f), pos) * scale;
				/*	if (x % 2 == 0) {
						m_BlueShader->UploadUniformFloat4("u_Color", redColor);
					}
					else {
						m_BlueShader->UploadUniformFloat4("u_Color", blueColor);
					}*/
		

					YOTO::Renderer::Submit(m_BlueShader, m_SquareVA, transform);
				}
			}
			
			auto textureShader = m_ShaderLibrary.Get("Texture");
			m_Texture->Bind();
			YOTO::Renderer::Submit(textureShader, m_SquareVA, glm::scale(glm::mat4(1.0f), glm::vec3(1.5f)));
			m_ChernoLogo->Bind();
			YOTO::Renderer::Submit(textureShader, m_SquareVA, glm::scale(glm::mat4(1.0f), glm::vec3(1.5f)));

			//YOTO::Renderer::Submit(m_Shader, m_VertexArray);


		
		}	
		YOTO::Renderer::EndScene();

		
		//YOTO::Renderer3D::BeginScene(m_Scene);
		//YOTO::Renderer2D::BeginScene(m_Scene);
	}
	void OnEvent(YOTO::Event& e)override {

		m_CameraController.OnEvent(e);
		/*if (event.GetEventType() == YOTO::EventType::KeyPressed) {
		YOTO:: KeyPressedEvent& e = (YOTO::KeyPressedEvent&)event;
		YT_CLIENT_TRACE("ExampleLayer:{0}",(char)e.GetKeyCode());
		if (e.GetKeyCode()==YT_KEY_TAB) {
			YT_CLIENT_INFO("ExampleLayerOnEvent:TAB按下了");
		}}*/
		//YT_CLIENT_TRACE("SandBoxApp:测试event{0}", event);




	}


private:
	YOTO::ShaderLibrary m_ShaderLibrary;
	YOTO::Ref m_Shader;
	YOTO::Ref m_VertexArray;


	YOTO::Ref m_BlueShader;
	YOTO::Ref m_SquareVA;
	
	YOTO::Ref m_Texture,m_ChernoLogo;

	YOTO::OrthographicCameraController m_CameraController;
	glm::vec3 m_SquareColor = { 0.2f,0.3f,0.7f };

};


class Sandbox:public YOTO::Application
{
public:
	Sandbox(){
		PushLayer(new ExampleLayer());
		//PushLayer(new YOTO::ImGuiLayer());
	}
	~Sandbox() {

	}

private:

};

YOTO::Application* YOTO::CreateApplication() {
	printf("helloworld");
	return new Sandbox();
}

测试：

 cool，随便写点儿，水一期