MFC+OpenGL可编程管线

[github链接]

网上的代码大都是固定管线渲染的，今天下午整理了下，把setPixelFormat、初始化glew、创建GL 4,2 context等操作封装到一个MFC类OpenGLWidget里。使用步骤：

1. 把OpenGLWidget.h和OpenGLWidget.cpp包含在项目里面。

2. 继承类OpenGLWidget，实现两个虚函数：Initialize()[负责加载数据]、RenderScene()[负责渲染]两个函数。比如下面的LeftWindow类：

#pragma once
#include "OpenGLWidget.h"

#include <Cameras/phc.h>
#include <OpenglWrappers/DemoMeshes/BlinnPhongMesh.h>

class LeftWindow : public OpenGLWidget{
    redips::PhC *m_phc = new redips::PhC(45, 1.0f, 0.1f, 10000);
    redips::BlinnPhongMesh* m_mesh = nullptr;
public:
    LeftWindow(){}
    ~LeftWindow(){
　　　　delete m_mesh; delete m_phc;    
    }
    bool Initialize(){
        m_mesh = new redips::BlinnPhongMesh(new redips::Triangles("E:/Documents/models/Effier/new_iffier.obj"));
        
　　　　 auto heart = m_mesh->model_ptr()->aabb_R().heart();
        m_phc->lookAt(heart + redips::float3(0, 0, 500), heart, redips::float3(0, 1, 0));
        return true;
    }
    void RenderScene(){
        m_mesh->uniformFloat3("lightColor", redips::float3(1, 1, 1));
        m_mesh->uniformFloat3("lightPos", m_phc->pos());
        m_mesh->uniformFloat3("cameraPos", m_phc->pos());
        m_mesh->uniformMat44f("model", redips::Mat44f::eye().ptr());
        m_mesh->uniformMat44f("projection", m_phc->glProjection().ptr());
        m_mesh->uniformMat44f("view", m_phc->glView().ptr());
        m_mesh->draw();
    }
};

[redips是我封装的渲染相关的类，详细介绍]

3. 将下面代码添加到OnInitDialog()函数里，即在当前对话框里创建了一个OpenGLWidget

m_leftWindow = new LeftWindow;
m_leftWindow ->Create(NULL, NULL, WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_VISIBLE,
                            CRect(0, 0, 800, 800),
                            this,   //this is the parent
                            0);