您最多选择25个主题
主题必须以中文或者字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
85 行
2.1 KiB
85 行
2.1 KiB
#ifndef UNITY_PACKING_INCLUDED
|
|
#define UNITY_PACKING_INCLUDED
|
|
|
|
#include "Common.hlsl"
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Normal packing
|
|
//-----------------------------------------------------------------------------
|
|
|
|
float3 PackNormalCartesian(float3 n)
|
|
{
|
|
return n * 0.5 + 0.5;
|
|
}
|
|
|
|
float3 UnpackNormalCartesian(float3 n)
|
|
{
|
|
return normalize(n * 2.0 - 1.0);
|
|
}
|
|
|
|
float3 PackNormalMaxComponent(float3 n)
|
|
{
|
|
// TODO: use max3
|
|
return (n / max(abs(n.x), max(abs(n.y), abs(n.z)))) * 0.5 + 0.5;
|
|
}
|
|
|
|
float3 UnpackNormalMaxComponent(float3 n)
|
|
{
|
|
return normalize(n * 2.0 - 1.0);
|
|
}
|
|
|
|
// Ref: http://jcgt.org/published/0003/02/01/paper.pdf
|
|
// Encode with Oct, this function work with any size of output
|
|
// return float between [-1, 1]
|
|
float2 PackNormalOctEncode(float3 v)
|
|
{
|
|
float l1norm = abs(v.x) + abs(v.y) + abs(v.z);
|
|
float2 res0 = v.xy * (1.0f / l1norm);
|
|
|
|
float2 val = 1.0f - abs(res0.yx);
|
|
return (v.zz < float2(0.0f, 0.0f) ? (res0 >= 0.0f ? val : -val) : res0);
|
|
}
|
|
|
|
float3 UnpackNormalOctEncode(float x, float y)
|
|
{
|
|
float3 v = float3(x, y, 1.0f - abs(x) - abs(y));
|
|
|
|
float2 val = 1.0f - abs(v.yx);
|
|
v.xy = (v.zz < float2(0.0f, 0.0f) ? (v.xy >= 0.0f ? val : -val) : v.xy);
|
|
|
|
return normalize(v);
|
|
}
|
|
|
|
float3 UnpackNormalDXT5nm (float4 packednormal)
|
|
{
|
|
float3 normal;
|
|
normal.xy = packednormal.wy * 2 - 1;
|
|
normal.z = sqrt(1 - saturate(dot(normal.xy, normal.xy)));
|
|
return normal;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Byte packing
|
|
//-----------------------------------------------------------------------------
|
|
|
|
float Pack2Byte(float2 inputs)
|
|
{
|
|
float2 temp = inputs * float2(255.0, 255.0);
|
|
temp.x *= 256.0;
|
|
temp = round(temp);
|
|
float combined = temp.x + temp.y;
|
|
return combined * (1.0 / 65535.0);
|
|
}
|
|
|
|
float2 Unpack2Byte(float inputs)
|
|
{
|
|
float temp = round(inputs * 65535.0);
|
|
float ipart;
|
|
float fpart = modf(temp / 256.0, ipart);
|
|
float2 result = float2(ipart, round(256.0 * fpart));
|
|
return result * (1.0 / float2(255.0, 255.0));
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#endif // UNITY_PACKING_INCLUDED
|