ULRE/example/Basic/auto_instance.cpp

// 该范例主要演示使用RenderList系统绘制多个三角形，并利用RenderList进行排序以及自动合并进行Instance渲染

#include<hgl/WorkManager.h>
#include<hgl/math/Math.h>
#include<hgl/graph/PrimitiveCreater.h>
#include<hgl/graph/VKVertexInputConfig.h>
#include<hgl/graph/mtl/Material2DCreateConfig.h>

using namespace hgl;
using namespace hgl::graph;

constexpr uint32_t VERTEX_COUNT=3;

constexpr uint32_t TRIANGLE_NUMBER=12;

constexpr float position_data[VERTEX_COUNT*2]=
{
     0.0,  0.0,
    -0.1,  0.9,
     0.1,  0.9
};

constexpr uint8 color_data[VERTEX_COUNT][4]=
{
    {255,0,0,255},
    {0,255,0,255},
    {0,0,255,255}
};

class TestApp:public WorkObject
{
    Color4f             clear_color         =Color4f(0.2f,0.2f,0.2f,1.0f);

private:

    AutoDelete<RenderList>  render_list     =nullptr;

    SceneNode           render_root;

    MaterialInstance *  material_instance   =nullptr;
    Renderable *        render_obj          =nullptr;

    Pipeline *          pipeline            =nullptr;

private:

    bool InitMaterial()
    {
        {
            mtl::Material2DCreateConfig cfg(GetDevAttr(),"VertexColor2D",PrimitiveType::Triangles);

            cfg.coordinate_system=CoordinateSystem2D::NDC;
            cfg.local_to_world=true;

            AutoDelete<mtl::MaterialCreateInfo> mci=mtl::CreateVertexColor2D(&cfg);

            VILConfig vil_config;

            vil_config.Add(VAN::Color,VF_V4UN8);

            material_instance=db->CreateMaterialInstance(mci,&vil_config);
        }

        if(!material_instance)
            return(false);

//        pipeline=db->CreatePipeline(material_instance,sc_render_target,OS_TEXT("res/pipeline/solid2d"));
        pipeline=CreatePipeline(material_instance,InlinePipeline::Solid2D,PrimitiveType::Triangles);     //等同上一行，为Framework重载，默认使用swapchain的render target

        return pipeline;
    }

    bool InitVBO()
    {
        render_obj=CreateRenderable("Triangle",VERTEX_COUNT,material_instance,pipeline,
                                    {
                                        {VAN::Position,   VF_V2F,     position_data},
                                        {VAN::Color,      VF_V4UN8,   color_data   }
                                    });

        if(!render_obj)
            return(false);

        double rad;
        Matrix4f mat;
        
        for(uint i=0;i<TRIANGLE_NUMBER;i++)
        {
            rad=deg2rad<double>((360.0f/double(TRIANGLE_NUMBER))*i);       //这里一定要加<float>或<float>，否则结果用int保存会出现问题
            mat=rotate(rad,Vector3f(0,0,1));

            render_root.Add(new SceneNode(mat,render_obj));
        }

        render_root.RefreshMatrix();

        render_list->Expend(&render_root);

        return(true);
    }

public:

    TestApp(RenderFramework *rf):WorkObject(rf,rf->GetSwapchainRenderTarget())
    {
        render_list=rf->CreateRenderList();

        if(!InitMaterial())
            return;

        if(!InitVBO())
            return;
    }

    void Render(double delta_time,graph::RenderCmdBuffer *cmd)override
    {
        cmd->SetClearColor(0,clear_color);

        cmd->BeginRenderPass();
            render_list->Render(cmd);
        cmd->EndRenderPass();
    }
};//class TestApp:public WorkObject

int os_main(int,os_char **)
{
    return RunFramework<TestApp>(OS_TEXT("AutoInstance"),1024,1024);
}