35 lines
1.2 KiB
HLSL
35 lines
1.2 KiB
HLSL
|
#ifndef UTS_LIGHTING_INCLUDED
|
||
|
|
#define UTS_LIGHTING_INCLUDED
|
||
|
|
|
||
|
|
inline float Intensity(float3 lightColor)
|
||
|
|
{
|
||
|
|
return 0.299 * lightColor.r + 0.587 * lightColor.g + 0.114 * lightColor.b;
|
||
|
|
}
|
||
|
|
|
||
|
|
//----------------------------------------------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
float3 ThreeColorsLinearShading(
|
||
|
|
float3 baseColor,
|
||
|
|
float3 firstColor,
|
||
|
|
float3 secondColor,
|
||
|
|
float baseTo1stStart, // t=0: use base, t=1: transition
|
||
|
|
float baseTo1stFeather,
|
||
|
|
float firstToSecondStart, //t=0: use base, t=1: transition
|
||
|
|
float firstToSecondFeather,
|
||
|
|
float dotNL) // dot(N.L)
|
||
|
|
{
|
||
|
|
const float t = saturate(1 - dotNL); //t = 0: light, t=1: dark shaded
|
||
|
|
|
||
|
|
const float invBaseTo1stStart = 1 - baseTo1stStart;
|
||
|
|
const float invBaseTo2ndStart = 1 - firstToSecondStart;
|
||
|
|
|
||
|
|
const float s1 = smoothstep(invBaseTo1stStart, invBaseTo1stStart + baseTo1stFeather,t);
|
||
|
|
const float s2 = smoothstep(invBaseTo2ndStart, invBaseTo2ndStart + firstToSecondFeather,t);
|
||
|
|
|
||
|
|
float3 c01 = lerp(baseColor,firstColor, s1);
|
||
|
|
float3 c12 = lerp(c01, secondColor, s2);
|
||
|
|
return c12;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // UTS_LIGHTING_INCLUDED
|