146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
#include<hgl/graph/vulkan/VK.h>
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#include<hgl/graph/vulkan/VKDevice.h>
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#include<hgl/filesystem/FileSystem.h>
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#include<hgl/LogInfo.h>
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VK_NAMESPACE_BEGIN
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namespace
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{
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#pragma pack(push,1)
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struct TGAHeader
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{
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uint8 id;
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uint8 color_map_type;
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uint8 image_type; // 1 colormap image ,2 true-color,3 grayscale
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uint16 color_map_first;
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uint16 color_map_length;
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uint8 color_map_size;
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uint16 x_origin;
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uint16 y_origin;
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uint16 width;
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uint16 height;
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uint8 bit;
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uint8 image_desc;
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};
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union TGAImageDesc
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{
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//不要把此union放到上面的struct中，否则Visual C++会将此union编译成4字节。GCC无此问题
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uint8 image_desc;
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struct
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{
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uint alpha_depth:4;
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uint reserved:1;
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uint direction:1; //0 lower-left,1 upper left
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};
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};
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#pragma pack(pop)
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void RGB8to565(uint8 *data,uint size)
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{
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uint8 *src=data;
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uint16 *target=(uint16 *)data;
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for(uint i=0;i<size;i++)
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{
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*target=((src[2]<<8)&0xF800)
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|((src[1]<<3)&0x7E0)
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| (src[0]>>3);
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++target;
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src+=3;
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}
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}
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void SwapRow(uint8 *data,uint line_size,uint height)
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{
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uint8 *top=data;
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uint8 *bottom=data+(height-1)*line_size;
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uint8 *tmp=new uint8[line_size];
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while(top<bottom)
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{
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memcpy(tmp,bottom,line_size);
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memcpy(bottom,top,line_size);
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memcpy(top,tmp,line_size);
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top+=line_size;
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bottom-=line_size;
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}
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delete[] tmp;
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}
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}//namespace
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Texture2D *LoadTGATexture(const OSString &filename,Device *device)
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{
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uint8 *data;
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const int64 file_length=filesystem::LoadFileToMemory(filename,(void **)&data);
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if(file_length<=0)
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{
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LOG_ERROR(OS_TEXT("[ERROR] open file<")+filename+OS_TEXT("> failed."));
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return(nullptr);
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}
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TGAHeader *header=(TGAHeader *)data;
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TGAImageDesc image_desc;
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uint8 *pixel_data=data+sizeof(TGAHeader);
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image_desc.image_desc=header->image_desc;
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VkFormat format;
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uint line_size;
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if(header->image_type==2)
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{
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if(header->bit==24)
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{
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RGB8to565(pixel_data,header->width*header->height);
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format=FMT_RGB565;
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line_size=header->width*2;
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}
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else if(header->bit==32)
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{
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format=FMT_RGBA8UN;
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line_size=header->width*4;
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}
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}
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else if(header->image_type==3&&header->bit==8)
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{
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format=FMT_R8UN;
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line_size=header->width;
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}
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else
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{
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LOG_ERROR(OS_TEXT("[ERROR] Image format error,filename: ")+filename);
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delete[] data;
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return(nullptr);
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}
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if(image_desc.direction==0)
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SwapRow(pixel_data,line_size,header->height);
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Texture2D *tex=device->CreateTexture2D(format,pixel_data,header->width,header->height,line_size*header->height);
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if(tex)
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{
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LOG_INFO(OS_TEXT("load image file<")+filename+OS_TEXT(">:<")+OSString(header->width)+OS_TEXT("x")+OSString(header->height)+OS_TEXT("> to texture ok"));
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//下面代码用于测试修改纹理
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//device->ChangeTexture2D(tex,pixel_data,header->width/4,header->height/4,header->width/2,header->height/2,line_size*header->height/4);
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}
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else
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{
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LOG_ERROR(OS_TEXT("load image file<")+filename+OS_TEXT(">:<")+OSString(header->width)+OS_TEXT("x")+OSString(header->height)+OS_TEXT("> to texture failed."));
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}
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delete[] data;
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return(tex);
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}
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VK_NAMESPACE_END |