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
66 行
1.8 KiB
66 行
1.8 KiB
#ifndef __TEETHATTENUATION_HLSL__
|
|
#define __TEETHATTENUATION_HLSL__
|
|
|
|
#if !defined(TEETH_DATA_FIXED_6) && !defined(TEETH_DATA_VARIABLE_32)
|
|
#define TEETH_DATA_FIXED_6
|
|
#endif
|
|
#if !defined(TEETH_ATTN_NONE) && !defined(TEETH_ATTN_LINEAR) && !defined(TEETH_ATTN_SKYPOLYGON)
|
|
#define TEETH_ATTN_NONE
|
|
#endif
|
|
|
|
#if defined(TEETH_DATA_FIXED_6)
|
|
#define SPHERICALPOLYGON_MAX_VERTS 6
|
|
#define SPHERICALPOLYGON_NUM_VERTS 6
|
|
#elif defined(TEETH_DATA_VARIABLE_32)
|
|
#define SPHERICALPOLYGON_MAX_VERTS 32
|
|
#define SPHERICALPOLYGON_NUM_VERTS _TeethVertexCount
|
|
#endif
|
|
|
|
uniform float4 _TeethParams;// x = lit potential min, y = lit potential max
|
|
uniform float4 _TeethVertexData[SPHERICALPOLYGON_MAX_VERTS];
|
|
uniform int _TeethVertexCount;
|
|
|
|
#include "SphericalPolygon.hlsl"
|
|
|
|
void TeethAttenuation_float(in float3 positionWS, out float attnPure, out float attnBiased)
|
|
{
|
|
attnPure = 1.0;
|
|
attnBiased = 1.0;
|
|
{
|
|
#if defined(TEETH_ATTN_NONE)
|
|
|
|
return;// no modification
|
|
|
|
#elif defined(TEETH_ATTN_LINEAR)
|
|
|
|
float3 posFront = _TeethVertexData[0].xyz;
|
|
float3 posBack = _TeethVertexData[1].xyz;
|
|
|
|
float3 v = posFront - posBack;
|
|
float dd = dot(v, v);
|
|
|
|
attnPure = saturate(dot(v / dd, positionWS - posBack));
|
|
attnBiased = _TeethParams.x + attnPure * (_TeethParams.y - _TeethParams.x);
|
|
|
|
#elif defined(TEETH_ATTN_SKYPOLYGON)
|
|
|
|
float3 P[SPHERICALPOLYGON_MAX_VERTS];
|
|
for (int i = 0; i != SPHERICALPOLYGON_NUM_VERTS; i++)
|
|
{
|
|
P[i] = normalize(_TeethVertexData[i].xyz - positionWS);
|
|
}
|
|
|
|
float incidentMax = 2.0 * PI;// hemisphere
|
|
float incidentSky;
|
|
SphericalPolygon_CalcAreaFromProjectedPositions(P, incidentSky);
|
|
|
|
attnPure = saturate(incidentSky / incidentMax);
|
|
attnPure = saturate(1.0 - pow(1.0 - attnPure, _TeethParams.z));
|
|
|
|
attnBiased = _TeethParams.x + attnPure * (_TeethParams.y - _TeethParams.x);
|
|
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#endif//__TEETHATTENUATION_HLSL__
|