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文章目录
049维护
软件工程就是一个不断迭代更新的过程，所以这次需要
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将项目从vs2017更新到vs2019
Win-GenProjects.bat
@echo off e: cd E:\AllWorkSpace1\GameEngineLightWeight\scripts pushd ..\ call vendor\bin\premake\premake5.exe vs2019 popd PAUSE -
整理项目文件夹
-
测试Release版本是否有效
050预备在SandBox封装2D渲染
前言
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此节所做
将Sandbox项目中的ExampleLayer渲染代码移到在Sandbox项目中新创建的SandBox2D(Layer)类中。
在SandBox2D类中调用Hazel项目中的OpenGL渲染类。
遇到的Bug
-
Bug1
由于Hazel.h中#include “Hazel/Core/EntryPoint.h”,
在SandboxApp中#include "Hazel.h"了
但Sandbox2D中又#include "Hazel.h"了
在EntryPoint.h中
#pragma once #ifdef HZ_PLATFORM_WINDOWS extern Hazel::Application* Hazel::CreateApplication(); int main(int argc, char** argv) { Hazel::Log::Init(); HZ_CORE_WARN("Initialized Log!"); int a = 5; HZ_INFO("Hello! Var={0}", a); auto app = Hazel::CreateApplication(); app->Run(); delete app; } #endif // HZ_PLATFORM_WINDOWS具有main函数的定义，这样的话SandboxApp与Sandbox2D中都有一份main函数的定义
所以会报main已经定义
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Bug2
-
原先Examplayer的shader与上传Uniform的代码是
std::string flatShaderfragmentSrc = R"( #version 330 core layout(location = 0) out vec4 color; in vec3 v_Position; uniform vec3 u_Color; void main(){ color = vec4(u_Color, 1.0f); } )"; std::dynamic_pointer_cast<Hazel::OpenGLShader>(m_FlatShader)->UploadUniformFloat3("u_Color", m_SquareColor); -
而移到FlatColor.glsl代码变为
#type fragment #version 330 core layout(location = 0) out vec4 color; uniform vec4 u_Color; void main() { color = u_Color; }这里u_Color是vec4，而如果还用原来的UploadUniformFloat3，使得，u_Color的第四位为0，从而显示不出图形
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代码修改
Sandbox2D
#pragma once
#include "Hazel.h"
class Sandbox2D :public Hazel::Layer
{
public:
Sandbox2D();
virtual ~Sandbox2D();
virtual void OnAttach() override;
virtual void OnDetach()override;
virtual void OnUpdate(Hazel::Timestep ts) override;
virtual void OnImgGuiRender() override;
virtual void OnEvent(Hazel::Event& event) override;
private:
Hazel::OrthographicCameraController m_CameraController;
Hazel::Ref<Hazel::Shader> m_FlatShader; // shader类 指针
Hazel::Ref<Hazel::VertexArray> m_FlatVertexArray;
glm::vec4 m_FlatColor = {
0.2f, 0.3f, 0.8f, 1.0f };
};
#include "Sandbox2D.h"
#include "imgui/imgui.h"
#include <Platform/OpenGL/OpenGLShader.h>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
Sandbox2D::Sandbox2D() : Layer("Sandbox2D"), m_CameraController(1280.0f / 720.0f, true){
}
void Sandbox2D::OnAttach(){
// 渲染网格 flat
float flatVertices[3 * 4] = {
-0.75f, -0.75f, 0.0f,
0.75f, -0.75f, 0.0f,
0.75f, 0.75f, 0.0f,
-0.75f, 0.75f, 0.0f
};
// 1.创建顶点数组
m_FlatVertexArray = (Hazel::VertexArray::Create());
// 2.创建顶点缓冲区
Hazel::Ref<Hazel::VertexBuffer> flatVB;
flatVB.reset(Hazel::VertexBuffer::Create(flatVertices, sizeof(flatVertices)));
// 2.1设置顶点缓冲区布局
flatVB->SetLayout({
{
Hazel::ShaderDataType::Float3, "a_Position"}
});
// 1.1顶点数组添加顶点缓冲区，并且在这个缓冲区中设置布局
m_FlatVertexArray->AddVertexBuffer(flatVB);
// 3.索引缓冲
uint32_t flatIndices[] = {
0, 1, 2, 2, 3, 0 };
Hazel::Ref<Hazel::IndexBuffer> flatIB;
flatIB.reset(Hazel::IndexBuffer::Create(flatIndices, sizeof(flatIndices) / sizeof(uint32_t)));
// 1.2顶点数组设置索引缓冲区
m_FlatVertexArray->SetIndexBuffer(flatIB);
m_FlatShader = (Hazel::Shader::Create("assets/shaders/FlatColor.glsl"));
}
void Sandbox2D::OnDetach(){
}
Sandbox2D::~Sandbox2D(){
}
void Sandbox2D::OnUpdate(Hazel::Timestep ts){
m_CameraController.OnUpdate(ts);
Hazel::RenderCommand::SetClearColor({
0.1f, 0.1f, 0.1f, 1 });
Hazel::RenderCommand::Clear();
Hazel::Renderer::BeginScene(m_CameraController.GetCamera());
std::dynamic_pointer_cast<Hazel::OpenGLShader>(m_FlatShader)->Bind();
std::dynamic_pointer_cast<Hazel::OpenGLShader>(m_FlatShader)->UploadUniformFloat4("u_Color", m_FlatColor);
glm::mat4 squareTexCoordtransfrom = glm::translate(glm::mat4(1.0f), {
0.0f, 0.0f, 0.0f });
Hazel::Renderer::Submit(m_FlatShader, m_FlatVertexArray, squareTexCoordtransfrom);
Hazel::Renderer::EndScene();
}
void Sandbox2D::OnImgGuiRender(){
ImGui::Begin("Settings");
ImGui::ColorEdit4("Square Color", glm::value_ptr(m_FlatColor));
ImGui::End();
}
void Sandbox2D::OnEvent(Hazel::Event& event){
// 事件
m_CameraController.OnEvent(event);
}