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
49 行
1.9 KiB
49 行
1.9 KiB
#ifndef COMMON_UTILITIES_INCLUDED
|
|
#define COMMON_UTILITIES_INCLUDED
|
|
|
|
// remaps a value based on a in:min/max and out:min/max
|
|
// value = value to be remapped
|
|
// remap = x = min in, y = max in, z = min out, w = max out
|
|
float Remap(half value, half4 remap)
|
|
{
|
|
return remap.z + (value - remap.x) * (remap.w - remap.z) / (remap.y - remap.x);
|
|
}
|
|
|
|
// Converts greyscale height to normal
|
|
// _tex = input texture(separate from a sampler)
|
|
// _sampler = the sampler to use
|
|
// _uv = uv coordinates
|
|
// _intensity = intensity of the effect
|
|
float3 HeightToNormal(Texture2D _tex, SamplerState _sampler, float2 _uv, half _intensity)
|
|
{
|
|
float3 bumpSamples;
|
|
bumpSamples.x = _tex.Sample(_sampler, _uv).x; // Sample center
|
|
bumpSamples.y = _tex.Sample(_sampler, float2(_uv.x + _intensity / _ScreenParams.x, _uv.y)).x; // Sample U
|
|
bumpSamples.z = _tex.Sample(_sampler, float2(_uv.x, _uv.y + _intensity / _ScreenParams.y)).x; // Sample V
|
|
half dHdU = bumpSamples.z - bumpSamples.x;//bump U offset
|
|
half dHdV = bumpSamples.y - bumpSamples.x;//bump V offset
|
|
return float3(-dHdU, dHdV, 0.5);//return tangent normal
|
|
}
|
|
|
|
// Simple noise from thebookofshaders.com
|
|
// 2D Random
|
|
float2 random(float2 st){
|
|
st = float2( dot(st,float2(127.1,311.7)), dot(st,float2(269.5,183.3)) );
|
|
return -1.0 + 2.0 * frac(sin(st) * 43758.5453123);
|
|
}
|
|
|
|
// 2D Noise based on Morgan McGuire @morgan3d
|
|
// https://www.shadertoy.com/view/4dS3Wd
|
|
float noise (float2 st) {
|
|
float2 i = floor(st);
|
|
float2 f = frac(st);
|
|
|
|
float2 u = f*f*(3.0-2.0*f);
|
|
|
|
return lerp( lerp( dot( random(i), f),
|
|
dot( random(i + float2(1.0,0.0) ), f - float2(1.0,0.0) ), u.x),
|
|
lerp( dot( random(i + float2(0.0,1.0) ), f - float2(0.0,1.0) ),
|
|
dot( random(i + float2(1.0,1.0) ), f - float2(1.0,1.0) ), u.x), u.y);
|
|
}
|
|
|
|
#endif // COMMON_UTILITIES_INCLUDED
|