ULRE/inc/hgl/graph/PrimitiveCreater.h

#pragma once

#include<hgl/graph/VKRenderResource.h>
#include<hgl/graph/VertexAttribDataAccess.h>
#include<hgl/graph/VKShaderModule.h>
#include<hgl/graph/VKIndexBuffer.h>

VK_NAMESPACE_BEGIN
class VertexDataManager;

/**
 * 可绘制图元创建器
 */
class PrimitiveCreater
{
protected:

    GPUDevice *device;
    const GPUPhysicalDevice *phy_device;

    VertexDataManager *vdm;

    const VIL *vil;

protected:

    VkDeviceSize        vertices_number;
    VkDeviceSize        index_number;

    IndexBuffer *       ibo;
    void *              ibo_map;
    VABAccessMap        vab_map;

protected:

    bool AcquirePVB(VABAccess *,const AnsiString &,const void *data);                                     ///<请求一个顶点属性数据区

    void ClearAllData();

public:

    PrimitiveCreater(GPUDevice *,const VIL *);
    PrimitiveCreater(VertexDataManager *);
    virtual ~PrimitiveCreater();

    virtual bool                    Init(const uint32 vertices_count,const uint32 index_count,IndexType it=IndexType::AUTO);                 ///<初始化，参数为顶点数量

    template<typename T> 
            T *                     AccessVAB(const AnsiString &name)                                           ///<创建一个顶点属性数据缓冲区以及访问器
            {
                const VkFormat format=vil->GetVulkanFormat(name);

                if(format!=T::GetVulkanFormat())
                    return(nullptr);

                VABAccess vad;

                if(!this->AcquirePVB(&vad,name,nullptr))
                    return(nullptr);

                T *access=T::Create(vertices_number,vad.map_ptr);

                access->Begin();

                return access;
            }

            bool                    WriteVAB(const AnsiString &name,const void *data,const uint32_t bytes);     ///<直接写入顶点属性数据

            const IndexType         GetIndexType()const{return ibo?ibo->GetType():IndexType::ERR;}              ///<取得索引数据类型

            template<typename T> T *AccessIBO()
            {
                if(!ibo)return(nullptr);
                if(ibo->GetStride()!=sizeof(T))return(nullptr);

                return (T *)ibo_map;
            }

            template<typename T> bool WriteIBO(const T *data)
            {
                if(!ibo)return(false);
                if(ibo->GetStride()!=sizeof(T))return(false);

                hgl_cpy<T>((T *)ibo_map,data,index_number);

                return(true);
            }

    virtual Primitive *             Finish(RenderResource *,const AnsiString &);                                                                   ///<结束并创建可渲染对象
};//class PrimitiveCreater
VK_NAMESPACE_END