62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
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#include<hgl/type/DataType.h>
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#include<hgl/math/Vector.h>
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/**
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* A_bit_more_deferred_-_CryEngine3
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Normal to GBufffer:
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G=normalize(N.xy)*sqrt(N.z*0.5+0.5)
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GBuffer to Normal:
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N.z=length2(G.xy)*2-1 N.xy=normalize(G.xy)*sqrt(1-N.z*N.z)
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*/
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namespace hgl
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{
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void normal_compress(uint8 *x,uint8 *y,const uint8 *rgb,const uint count)
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{
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Vector3f in;
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Vector2f in_xy;
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Vector2f out;
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for(uint i=0;i<count;i++)
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{
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in.x=float(*rgb)/255.0f;++rgb;
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in.y=float(*rgb)/255.0f;++rgb;
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in.z=float(*rgb)/255.0f;++rgb;
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in_xy=in.xy().Normalized();
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out=in_xy*sqrt(in.z*0.5+0.5);
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*x=out.x*255;++x;
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*y=out.y*255;++y;
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}
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}
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void normal_decompress(uint8 *rgb,const uint8 *x,const uint8 *y,const uint count)
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{
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Vector2f in;
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Vector2f in_normal;
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Vector3f out;
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float s;
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for(uint i=0;i<count;i++)
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{
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in.x=(*x)/255.0f;++x;
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in.y=(*y)/255.0f;++y;
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out.z=length(in)*2.0-1;
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in_normal=in.Normalized();
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s=sqrt(1-out.z*out.z);
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out.x=in_normal.x*s;
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out.y=in_normal.y*s;
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*rgb=out.x*255;++rgb;
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*rgb=out.y*255;++rgb;
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*rgb=out.z*255;++rgb;
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}
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}
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}//namespace hgl
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