117 lines
2.8 KiB
C++
117 lines
2.8 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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FMT_BC1_RGBUN,
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FMT_BC1_RGBAUN,
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FMT_BC2UN,
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FMT_BC3UN,
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FMT_BC4UN,
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FMT_BC5UN,
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FMT_BC6UF,
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FMT_BC6SF,
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FMT_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 Tex2DFileHeader
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{
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uint8 id[6]; ///<Tex2D\x1A
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uint8 version; ///<必须为2
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uint8 mipmaps;
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uint32 width;
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uint32 height;
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uint8 channels;
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public:
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const uint pixel_count()const{return width*height;}
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};//struct Tex2DFileHeader
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struct TexPixelFormat
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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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public:
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const uint pixel_bits()const{return bits[0]+bits[1]+bits[2]+bits[3];}
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const uint pixel_bytes()const{return pixel_bits()>>3;}
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};//struct TexPixelFormat
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#pragma pack(pop)
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/**
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* 2D纹理加载器
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*/
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class Texture2DLoader
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{
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protected:
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Tex2DFileHeader file_header;
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union
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{
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TexPixelFormat pixel_format;
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uint16 compress_format;
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};
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protected:
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uint32 mipmap_zero_total_bytes;
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uint32 ComputeTotalBytes();
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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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const Tex2DFileHeader *GetFileHeader()const{return &file_header;}
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public:
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virtual ~Texture2DLoader()=default;
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bool Load(io::InputStream *is);
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bool Load(const OSString &filename);
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};//class Texture2DLoader
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/**
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* 2D位图加载
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*/
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class Bitmap2DLoader:public Texture2DLoader
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{
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protected:
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BitmapData *bmp=nullptr;
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public:
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~Bitmap2DLoader();
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void *OnBegin(uint32 total_bytes) override;
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void OnEnd() override {}
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BitmapData *GetBitmap();
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};//class Bitmap2DLoader
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BitmapData *LoadBitmapFromFile(const OSString &filename);
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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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