151 lines
4.7 KiB
C++
151 lines
4.7 KiB
C++
#ifndef HGL_GRAPH_TEXTURE_LOADER_INCLUDE
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#define HGL_GRAPH_TEXTURE_LOADER_INCLUDE
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#include<hgl/io/InputStream.h>
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#include<hgl/type/String.h>
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#include<hgl/graph/Bitmap.h>
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#include<hgl/graph/VKFormat.h>
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namespace hgl
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{
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namespace graph
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{
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constexpr VkFormat CompressFormatList[]=
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{
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PF_BC1_RGBUN,
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PF_BC1_RGBAUN,
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PF_BC2UN,
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PF_BC3UN,
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PF_BC4UN,
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PF_BC5UN,
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PF_BC6UF,
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PF_BC6SF,
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PF_BC7UN
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};
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constexpr uint32 CompressFormatBits[]={4,4,8,8,4,8,8,8,8};
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constexpr uint32 CompressFormatCount=sizeof(CompressFormatList)/sizeof(VkFormat);
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#pragma pack(push,1)
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struct TexPixelFormat
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{
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uint8 channels; //0: compress 1/2/3/4:normal
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union
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{
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struct
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{
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char colors[4];
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uint8 bits[4];
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uint8 datatype;
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};
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struct
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{
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uint16 compress_format;
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};
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};
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public:
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const uint pixel_bits()const
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{
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return channels ?bits[0]+bits[1]+bits[2]+bits[3]
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:CompressFormatBits[compress_format];
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}
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};//struct TexPixelFormat
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constexpr uint TexPixelFormatLength=sizeof(TexPixelFormat);
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struct alignas(8) TextureFileHeader
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{
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uint8 id_str[8]; ///<Texture\x1A
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uint8 version; ///<必须为0
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uint8 type; ///<贴图类型，等同于VkImageViewType
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union
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{
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uint32 length; ///<长(1D纹理用)
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uint32 width; ///<宽(2D/Cube纹理用)
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};
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uint32 height; ///<高(2D/3D/Cube纹理用)
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union
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{
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uint32 depth; ///<深度(3D纹理用)
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uint32 layers; ///<层数(Arrays纹理用)
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};
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TexPixelFormat pixel_format; ///<象素格式
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uint8 mipmaps; ///<mipmaps
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};
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constexpr uint TextureFileHeaderLength=sizeof(TextureFileHeader); //GPUBuffer内需要64位8字节对齐，如果此值不对齐，请想办法填0
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#pragma pack(pop)
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const uint32 ComputeMipmapBytes(uint32 length,uint32 bytes);
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const uint32 ComputeMipmapBytes(uint32 width,uint32 height,uint32 bytes);
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const uint32 ComputeMipmapBytes(uint32 width,uint32 height,uint32 depth,uint32 bytes);
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class TextureLoader
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{
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protected:
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VkImageViewType type;
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TextureFileHeader file_header;
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VkFormat format;
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uint32 mipmap_zero_total_bytes; ///< 0 级mipmaps单个图象的总字节数
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uint32 total_bytes; ///<总字节数
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protected:
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virtual uint32 GetPixelsCount()const=0;
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virtual uint32 GetImageCount()const=0; ///<每个级别的图象数量
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virtual uint32 GetTotalBytes()const=0; ///<计算总字节数
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protected:
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virtual void *OnBegin(uint32)=0;
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virtual void OnEnd()=0;
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virtual void OnError(){}
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public:
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TextureLoader(const VkImageViewType &ivt){type=ivt;}
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virtual bool Load(io::InputStream *);
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bool Load(const OSString &filename);
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};//class TextureLoader
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/**
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* 2D纹理加载器
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*/
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class Texture2DLoader:public TextureLoader
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{
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protected: // override functions
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uint32 GetPixelsCount()const override{return file_header.width*file_header.height;}
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uint32 GetImageCount()const override{return 1;}
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uint32 GetTotalBytes()const override
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{
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if(file_header.mipmaps<=1)
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return mipmap_zero_total_bytes;
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else
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return ComputeMipmapBytes( file_header.width,
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file_header.height,
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mipmap_zero_total_bytes);
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}
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public:
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Texture2DLoader():TextureLoader(VK_IMAGE_VIEW_TYPE_2D){}
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virtual ~Texture2DLoader()=default;
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};//class Texture2DLoader
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}//namespace graph
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}//namespace hgl
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#endif//HGL_GRAPH_TEXTURE_LOADER_INCLUDE
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