الهندسة العكسية لعرض The Witcher 3: تأثيرات السماء المختلفة

الجزء 1. سحابة سيروس

تظليل هندسي ورأسي

بكسل تظليل

 ps_5_0  
    dcl_globalFlags refactoringAllowed  
    dcl_constantbuffer cb0[10], immediateIndexed  
    dcl_constantbuffer cb1[9], immediateIndexed  
    dcl_constantbuffer cb12[238], immediateIndexed  
    dcl_constantbuffer cb4[13], immediateIndexed  
    dcl_sampler s0, mode_default  
    dcl_resource_texture2d (float,float,float,float) t0  
    dcl_resource_texture2d (float,float,float,float) t1  
    dcl_input_ps linear v0.xyzw  
    dcl_input_ps linear v1.xyzw  
    dcl_input_ps linear v2.w  
    dcl_input_ps linear v3.xyzw  
    dcl_input_ps linear v4.xyz  
    dcl_input_ps linear v5.xyz  
    dcl_output o0.xyzw  
    dcl_temps 4  
   0: mul r0.xyz, cb0[9].xyzx, l(1.000000, 1.000000, -1.000000, 0.000000)  
   1: dp3 r0.w, r0.xyzx, r0.xyzx  
   2: rsq r0.w, r0.w  
   3: mul r0.xyz, r0.wwww, r0.xyzx  
   4: mul r1.xy, cb0[0].xxxx, cb4[5].xyxx  
   5: mad r1.xy, v1.xyxx, cb4[4].xyxx, r1.xyxx  
   6: sample_indexable(texture2d)(float,float,float,float) r1.xyzw, r1.xyxx, t0.xyzw, s0  
   7: add r1.xyz, r1.xyzx, l(-0.500000, -0.500000, -0.500000, 0.000000)  
   8: add r1.xyz, r1.xyzx, r1.xyzx  
   9: dp3 r0.w, r1.xyzx, r1.xyzx  
  10: rsq r0.w, r0.w  
  11: mul r1.xyz, r0.wwww, r1.xyzx  
  12: mul r2.xyz, r1.yyyy, v3.xyzx  
  13: mad r2.xyz, v5.xyzx, r1.xxxx, r2.xyzx  
  14: mov r3.xy, v1.zwzz  
  15: mov r3.z, v3.w  
  16: mad r1.xyz, r3.xyzx, r1.zzzz, r2.xyzx  
  17: dp3_sat r0.x, r0.xyzx, r1.xyzx  
  18: add r0.y, -cb4[2].x, cb4[3].x  
  19: mad r0.x, r0.x, r0.y, cb4[2].x  
  20: dp2 r0.y, -cb0[9].xyxx, -cb0[9].xyxx  
  21: rsq r0.y, r0.y  
  22: mul r0.yz, r0.yyyy, -cb0[9].xxyx  
  23: add r1.xyz, -v4.xyzx, cb1[8].xyzx  
  24: dp3 r0.w, r1.xyzx, r1.xyzx  
  25: rsq r1.z, r0.w  
  26: sqrt r0.w, r0.w  
  27: add r0.w, r0.w, -cb4[7].x  
  28: mul r1.xy, r1.zzzz, r1.xyxx  
  29: dp2_sat r0.y, r0.yzyy, r1.xyxx  
  30: add r0.y, r0.y, r0.y  
  31: min r0.y, r0.y, l(1.000000)  
  32: add r0.z, -cb4[0].x, cb4[1].x  
  33: mad r0.z, r0.y, r0.z, cb4[0].x  
  34: mul r0.x, r0.x, r0.z  
  35: log r0.x, r0.x  
  36: mul r0.x, r0.x, l(2.200000)  
  37: exp r0.x, r0.x  
  38: add r1.xyz, cb12[236].xyzx, -cb12[237].xyzx  
  39: mad r1.xyz, r0.yyyy, r1.xyzx, cb12[237].xyzx  
  40: mul r2.xyz, r0.xxxx, r1.xyzx  
  41: mad r0.xyz, -r1.xyzx, r0.xxxx, v0.xyzx  
  42: mad r0.xyz, v0.wwww, r0.xyzx, r2.xyzx  
  43: add r1.x, -cb4[7].x, cb4[8].x  
  44: div_sat r0.w, r0.w, r1.x  
  45: mul r1.x, r1.w, cb4[9].x  
  46: mad r1.y, -cb4[9].x, r1.w, r1.w  
  47: mad r0.w, r0.w, r1.y, r1.x  
  48: mul r1.xy, cb0[0].xxxx, cb4[11].xyxx  
  49: mad r1.xy, v1.xyxx, cb4[10].xyxx, r1.xyxx  
  50: sample_indexable(texture2d)(float,float,float,float) r1.x, r1.xyxx, t1.xyzw, s0  
  51: mad r1.x, r1.x, cb4[12].x, -cb4[12].x  
  52: mad_sat r1.x, cb4[12].x, v2.w, r1.x  
  53: mul r0.w, r0.w, r1.x  
  54: mul_sat r0.w, r0.w, cb4[6].x  
  55: mul o0.xyz, r0.wwww, r0.xyzx  
  56: mov o0.w, r0.w  
  57: ret 

عكس اتجاه ضوء الشمس

   0: mul r0.xyz, cb0[9].xyzx, l(1.000000, 1.000000, -1.000000, 0.000000)  
   1: dp3 r0.w, r0.xyzx, r0.xyzx  
   2: rsq r0.w, r0.w  
   3: mul r0.xyz, r0.wwww, r0.xyzx  

   float3 invertedSunlightDir = normalize(lightDir * float3(1, 1, -1) );

سحابة أخذ العينات

   4: mul r1.xy, cb0[0].xxxx, cb4[5].xyxx   
   5: mad r1.xy, v1.xyxx, cb4[4].xyxx, r1.xyxx   
   6: sample_indexable(texture2d)(float,float,float,float) r1.xyzw, r1.xyxx, t0.xyzw, s0   
   7: add r1.xyz, r1.xyzx, l(-0.500000, -0.500000, -0.500000, 0.000000)   
   8: add r1.xyz, r1.xyzx, r1.xyzx   
   9: dp3 r0.w, r1.xyzx, r1.xyzx   
  10: rsq r0.w, r0.w   
   
   
   // Calc sampling coords  
   float2 cloudTextureUV = Texcoords * textureScale + elapsedTime * speedFactors;  
   
   // Sample texture and get data from it  
   float4 cloudTextureValue = texture0.Sample( sampler0, cloudTextureUV ).rgba;  
   float3 normalMap = cloudTextureValue.xyz;  
   float cloudShape = cloudTextureValue.a;  
   
   // Unpack normal and normalize it  
   float3 unpackedNormal = (normalMap - 0.5) * 2.0;  
   unpackedNormal = normalize(unpackedNormal);

samplingUV = Input.TextureUV * textureScale + time * speedMultiplier;

unpackedNormal = (packedNormal - 0.5) * 2.0;

unpackedNormal = packedNormal * 2.0 - 1.0;

تراكب عادي

  11: mul r1.xyz, r0.wwww, r1.xyzx  
  12: mul r2.xyz, r1.yyyy, v3.xyzx  
  13: mad r2.xyz, v5.xyzx, r1.xxxx, r2.xyzx  
  14: mov r3.xy, v1.zwzz  
  15: mov r3.z, v3.w  
  16: mad r1.xyz, r3.xyzx, r1.zzzz, r2.xyzx  
    
   // Perform bump mapping  
   float3 SkyTangent = Input.Tangent;  
   float3 SkyNormal = (float3( Input.Texcoords.zw, Input.param3.w ));  
   float3 SkyBitangent = Input.param3.xyz;  
        
   float3x3 TBN = float3x3(SkyTangent, SkyBitangent, SkyNormal);  
   float3 finalNormal = (float3)mul( unpackedNormal, (TBN) );

سطوع (1)

  17: dp3_sat r0.x, r0.xyzx, r1.xyzx  
  18: add r0.y, -cb4[2].x, cb4[3].x  
  19: mad r0.x, r0.x, r0.y, cb4[2].x  

   // Calculate cosine between normal and up-inv lightdir  
   float NdotL = saturate( dot(invertedSunlightDir, finalNormal) );  
   
   // Param 1, line 19, r0.x  
   float intensity1 = lerp( param1Min, param1Max, NdotL );

سطوع (2)

  20: dp2 r0.y, -cb0[9].xyxx, -cb0[9].xyxx  
  21: rsq r0.y, r0.y  
  22: mul r0.yz, r0.yyyy, -cb0[9].xxyx  
  23: add r1.xyz, -v4.xyzx, cb1[8].xyzx  
  24: dp3 r0.w, r1.xyzx, r1.xyzx  
  25: rsq r1.z, r0.w  
  26: sqrt r0.w, r0.w  
  27: add r0.w, r0.w, -cb4[7].x  
  28: mul r1.xy, r1.zzzz, r1.xyxx  
  29: dp2_sat r0.y, r0.yzyy, r1.xyxx  
  30: add r0.y, r0.y, r0.y  
  31: min r0.y, r0.y, l(1.000000)  
  32: add r0.z, -cb4[0].x, cb4[1].x  
  33: mad r0.z, r0.y, r0.z, cb4[0].x  
  34: mul r0.x, r0.x, r0.z  
  35: log r0.x, r0.x  
  36: mul r0.x, r0.x, l(2.200000)  
  37: exp r0.x, r0.x   
   
   
   // Calculate normalized -lightDir.xy (20-22)  
   float2 lightDirXY = normalize( -lightDir.xy );  
   
   // Calculate world to camera  
   float3 vWorldToCamera = ( CameraPos - WorldPos );  
   float worldToCamera_distance = length(vWorldToCamera);  
        
   // normalize vector  
   vWorldToCamera = normalize( vWorldToCamera );  
        
   
   float LdotV = saturate( dot(lightDirXY, vWorldToCamera.xy) );  
   float highlightedSkySection = saturate( 2*LdotV );  
   float intensity2 = lerp( param2Min, param2Max, highlightedSkySection );  
   
   float finalIntensity = pow( intensity2 *intensity1, 2.2);

لون الغيوم

  38: add r1.xyz, cb12[236].xyzx, -cb12[237].xyzx  
  39: mad r1.xyz, r0.yyyy, r1.xyzx, cb12[237].xyzx  
  40: mul r2.xyz, r0.xxxx, r1.xyzx  
  41: mad r0.xyz, -r1.xyzx, r0.xxxx, v0.xyzx  
  42: mad r0.xyz, v0.wwww, r0.xyzx, r2.xyzx  
   
  float3 cloudsColor = lerp( cloudsColorBack, cloudsColorFront, highlightedSunSection );  
  cloudsColor *= finalIntensity;  
  cloudsColor = lerp( cloudsColor, FogColor, FogAmount );

جعل السحب الرقيقة أكثر وضوحا في الأفق

  23: add r1.xyz, -v4.xyzx, cb1[8].xyzx  
  24: dp3 r0.w, r1.xyzx, r1.xyzx  
  25: rsq r1.z, r0.w  
  26: sqrt r0.w, r0.w

  26: sqrt r0.w, r0.w  
  27: add r0.w, r0.w, -cb4[7].x  
  ...  
  43: add r1.x, -cb4[7].x, cb4[8].x  
  44: div_sat r0.w, r0.w, r1.x

linstep( 1000.0, 2000.0, 999.0) = 0.0
linstep( 1000.0, 2000.0, 1500.0) = 0.5
linstep( 1000.0, 2000.0, 2000.0) = 1.0

 // linstep:  
 //  
 // Returns a linear interpolation between 0 and 1 if t is in the range [min, max]   
 // if "v" is <= min, the output is 0  
 // if "v" i >= max, the output is 1  
   
 float linstep( float min, float max, float v )  
 {  
   return saturate( (v - min) / (max - min) );  
 } 

  45: mul r1.x, r1.w, cb4[9].x  
  46: mad r1.y, -cb4[9].x, r1.w, r1.w  
  47: mad r0.w, r0.w, r1.y, r1.x  
   
   float distanceAttenuation = linstep( fadeDistanceStart, fadeDistanceEnd, worldToCamera_distance );  
    
   float fadedCloudShape = closeCloudsHidingFactor * cloudShape;  
   cloudShape = lerp( fadedCloudShape, cloudShape, distanceAttenuation );

أخذ عينات نسيج الضوضاء

  48: mul r1.xy, cb0[0].xxxx, cb4[11].xyxx  
  49: mad r1.xy, v1.xyxx, cb4[10].xyxx, r1.xyxx  
  50: sample_indexable(texture2d)(float,float,float,float) r1.x, r1.xyxx, t1.xyzw, s0  
   
   // Calc sampling coords for noise  
   float2 noiseTextureUV = Texcoords * textureScaleNoise + elapsedTime * speedFactorsNoise;  
   
   // Sample texture and get data from it  
   float noiseTextureValue = texture1.Sample( sampler0, noiseTextureUV ).x;

ضع كل شيء معا

  51: mad r1.x, r1.x, cb4[12].x, -cb4[12].x
  52: mad_sat r1.x, cb4[12].x, v2.w, r1.x
  53: mul r0.w, r0.w, r1.x
  54: mul_sat r0.w, r0.w, cb4[6].x
  55: mul o0.xyz, r0.wwww, r0.xyzx
  56: mov o0.w, r0.w
  57: ret   

   // Sample noise texture and get data from it  
   float noiseTextureValue = texture1.Sample( sampler0, noiseTextureUV ).x;  
   noiseTextureValue = noiseTextureValue * noiseMult - noiseMult;  
     
   float noiseValue = saturate( noiseMult * Input.param2.w + noiseTextureValue);  
   noiseValue *= cloudShape;  
     
   float finalNoise = saturate( noiseValue * generalCloudsVisibility);  
   
   return float4( cloudsColor*finalNoise, finalNoise ); 

مجموع

الجزء 2. الضباب

 ps_5_0  
    dcl_globalFlags refactoringAllowed  
    dcl_constantbuffer cb3[2], immediateIndexed  
    dcl_constantbuffer cb12[214], immediateIndexed  
    dcl_resource_texture2d (float,float,float,float) t0  
    dcl_resource_texture2d (float,float,float,float) t1  
    dcl_resource_texture2d (float,float,float,float) t2  
    dcl_input_ps_siv v0.xy, position  
    dcl_output o0.xyzw  
    dcl_temps 7  
   0: ftou r0.xy, v0.xyxx  
   1: mov r0.zw, l(0, 0, 0, 0)  
   2: ld_indexable(texture2d)(float,float,float,float) r1.x, r0.xyww, t0.xyzw  
   3: mad r1.y, r1.x, cb12[22].x, cb12[22].y  
   4: lt r1.y, r1.y, l(1.000000)  
   5: if_nz r1.y  
   6:  utof r1.yz, r0.xxyx  
   7:  mul r2.xyzw, r1.zzzz, cb12[211].xyzw  
   8:  mad r2.xyzw, cb12[210].xyzw, r1.yyyy, r2.xyzw  
   9:  mad r1.xyzw, cb12[212].xyzw, r1.xxxx, r2.xyzw  
  10:  add r1.xyzw, r1.xyzw, cb12[213].xyzw  
  11:  div r1.xyz, r1.xyzx, r1.wwww  
  12:  ld_indexable(texture2d)(float,float,float,float) r2.xyz, r0.xyww, t1.xyzw  
  13:  ld_indexable(texture2d)(float,float,float,float) r0.x, r0.xyzw, t2.xyzw  
  14:  max r0.x, r0.x, cb3[1].x  
  15:  add r0.yzw, r1.xxyz, -cb12[0].xxyz  
  16:  dp3 r1.x, r0.yzwy, r0.yzwy  
  17:  sqrt r1.x, r1.x  
  18:  add r1.y, r1.x, -cb3[0].x  
  19:  add r1.zw, -cb3[0].xxxz, cb3[0].yyyw  
  20:  div_sat r1.y, r1.y, r1.z  
  21:  mad r1.y, r1.y, r1.w, cb3[0].z  
  22:  add r0.x, r0.x, l(-1.000000)  
  23:  mad r0.x, r1.y, r0.x, l(1.000000)  
  24:  div r0.yzw, r0.yyzw, r1.xxxx  
  25:  mad r1.y, r0.w, cb12[22].z, cb12[0].z  
  26:  add r1.x, r1.x, -cb12[22].z  
  27:  max r1.x, r1.x, l(0)  
  28:  min r1.x, r1.x, cb12[42].z  
  29:  mul r1.z, r0.w, r1.x  
  30:  mul r1.w, r1.x, cb12[43].x  
  31:  mul r1.zw, r1.zzzw, l(0.000000, 0.000000, 0.062500, 0.062500)  
  32:  dp3 r0.y, cb12[38].xyzx, r0.yzwy  
  33:  add r0.z, r0.y, cb12[42].x  
  34:  add r0.w, cb12[42].x, l(1.000000)  
  35:  div_sat r0.z, r0.z, r0.w  
  36:  add r0.w, -cb12[43].z, cb12[43].y  
  37:  mad r0.z, r0.z, r0.w, cb12[43].z  
  38:  mul r0.w, abs(r0.y), abs(r0.y)  
  39:  mad_sat r2.w, r1.x, l(0.002000), l(-0.300000)  
  40:  mul r0.w, r0.w, r2.w  
  41:  lt r0.y, l(0), r0.y  
  42:  movc r3.xyz, r0.yyyy, cb12[39].xyzx, cb12[41].xyzx  
  43:  add r3.xyz, r3.xyzx, -cb12[40].xyzx  
  44:  mad r3.xyz, r0.wwww, r3.xyzx, cb12[40].xyzx  
  45:  movc r4.xyz, r0.yyyy, cb12[45].xyzx, cb12[47].xyzx  
  46:  add r4.xyz, r4.xyzx, -cb12[46].xyzx  
  47:  mad r4.xyz, r0.wwww, r4.xyzx, cb12[46].xyzx  
  48:  ge r0.y, r1.x, cb12[48].y  
  49:  if_nz r0.y  
  50:   add r0.y, r1.y, cb12[42].y  
  51:   mul r0.w, r0.z, r0.y  
  52:   mul r1.y, r0.z, r1.z  
  53:   mad r5.xyzw, r1.yyyy, l(16.000000, 15.000000, 14.000000, 13.000000), r0.wwww  
  54:   max r5.xyzw, r5.xyzw, l(0, 0, 0, 0)  
  55:   add r5.xyzw, r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  56:   div_sat r5.xyzw, r1.wwww, r5.xyzw  
  57:   add r5.xyzw, -r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  58:   mul r1.z, r5.y, r5.x  
  59:   mul r1.z, r5.z, r1.z  
  60:   mul r1.z, r5.w, r1.z  
  61:   mad r5.xyzw, r1.yyyy, l(12.000000, 11.000000, 10.000000, 9.000000), r0.wwww  
  62:   max r5.xyzw, r5.xyzw, l(0, 0, 0, 0)  
  63:   add r5.xyzw, r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  64:   div_sat r5.xyzw, r1.wwww, r5.xyzw  
  65:   add r5.xyzw, -r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  66:   mul r1.z, r1.z, r5.x  
  67:   mul r1.z, r5.y, r1.z  
  68:   mul r1.z, r5.z, r1.z  
  69:   mul r1.z, r5.w, r1.z  
  70:   mad r5.xyzw, r1.yyyy, l(8.000000, 7.000000, 6.000000, 5.000000), r0.wwww  
  71:   max r5.xyzw, r5.xyzw, l(0, 0, 0, 0)  
  72:   add r5.xyzw, r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  73:   div_sat r5.xyzw, r1.wwww, r5.xyzw  
  74:   add r5.xyzw, -r5.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  75:   mul r1.z, r1.z, r5.x  
  76:   mul r1.z, r5.y, r1.z  
  77:   mul r1.z, r5.z, r1.z  
  78:   mul r1.z, r5.w, r1.z  
  79:   mad r5.xy, r1.yyyy, l(4.000000, 3.000000, 0.000000, 0.000000), r0.wwww  
  80:   max r5.xy, r5.xyxx, l(0, 0, 0, 0)  
  81:   add r5.xy, r5.xyxx, l(1.000000, 1.000000, 0.000000, 0.000000)  
  82:   div_sat r5.xy, r1.wwww, r5.xyxx  
  83:   add r5.xy, -r5.xyxx, l(1.000000, 1.000000, 0.000000, 0.000000)  
  84:   mul r1.z, r1.z, r5.x  
  85:   mul r1.z, r5.y, r1.z  
  86:   mad r0.w, r1.y, l(2.000000), r0.w  
  87:   max r0.w, r0.w, l(0)  
  88:   add r0.w, r0.w, l(1.000000)  
  89:   div_sat r0.w, r1.w, r0.w  
  90:   add r0.w, -r0.w, l(1.000000)  
  91:   mul r0.w, r0.w, r1.z  
  92:   mad r0.y, r0.y, r0.z, r1.y  
  93:   max r0.y, r0.y, l(0)  
  94:   add r0.y, r0.y, l(1.000000)  
  95:   div_sat r0.y, r1.w, r0.y  
  96:   add r0.y, -r0.y, l(1.000000)  
  97:   mad r0.y, -r0.w, r0.y, l(1.000000)  
  98:   add r0.z, r1.x, -cb12[48].y  
  99:   mul_sat r0.z, r0.z, cb12[48].z  
  100:  else  
  101:   mov r0.yz, l(0.000000, 1.000000, 0.000000, 0.000000)  
  102:  endif  
  103:  log r0.y, r0.y  
  104:  mul r0.w, r0.y, cb12[42].w  
  105:  exp r0.w, r0.w  
  106:  mul r0.y, r0.y, cb12[48].x  
  107:  exp r0.y, r0.y  
  108:  mul r0.yw, r0.yyyw, r0.zzzz  
  109:  mad_sat r1.xy, r0.wwww, cb12[189].xzxx, cb12[189].ywyy  
  110:  add r5.xyz, -r3.xyzx, cb12[188].xyzx  
  111:  mad r5.xyz, r1.xxxx, r5.xyzx, r3.xyzx  
  112:  add r0.z, cb12[188].w, l(-1.000000)  
  113:  mad r0.z, r1.y, r0.z, l(1.000000)  
  114:  mul_sat r5.w, r0.z, r0.w  
  115:  lt r0.z, l(0), cb12[192].x  
  116:  if_nz r0.z  
  117:   mad_sat r1.xy, r0.wwww, cb12[191].xzxx, cb12[191].ywyy  
  118:   add r6.xyz, -r3.xyzx, cb12[190].xyzx  
  119:   mad r3.xyz, r1.xxxx, r6.xyzx, r3.xyzx  
  120:   add r0.z, cb12[190].w, l(-1.000000)  
  121:   mad r0.z, r1.y, r0.z, l(1.000000)  
  122:   mul_sat r3.w, r0.z, r0.w  
  123:   add r1.xyzw, -r5.xyzw, r3.xyzw  
  124:   mad r5.xyzw, cb12[192].xxxx, r1.xyzw, r5.xyzw  
  125:  endif  
  126:  mul r0.z, r0.x, r5.w  
  127:  mul r0.x, r0.x, r0.y  
  128:  dp3 r0.y, l(0.333000, 0.555000, 0.222000, 0.000000), r2.xyzx  
  129:  mad r1.xyz, r0.yyyy, r4.xyzx, -r2.xyzx  
  130:  mad r0.xyw, r0.xxxx, r1.xyxz, r2.xyxz  
  131:  add r1.xyz, -r0.xywx, r5.xyzx  
  132:  mad r0.xyz, r0.zzzz, r1.xyzx, r0.xywx  
  133: else  
  134:  mov r0.xyz, l(0, 0, 0, 0)  
  135: endif  
  136: mov o0.xyz, r0.xyzx  
  137: mov o0.w, l(1.000000)  
  138: ret 

 struct FogResult  
 {  
    float4 paramsFog;     // RGB: color, A: influence  
    float4 paramsAerial;  // RGB: color, A: influence  
 };

   // *** Inputs *** //  
   float3 FogSunDir = cb12_v38.xyz;  
   float3 FogColorFront = cb12_v39.xyz;  
   float3 FogColorMiddle = cb12_v40.xyz;  
   float3 FogColorBack = cb12_v41.xyz;  
     
   float4 FogBaseParams = cb12_v42;  
   float4 FogDensityParamsScene = cb12_v43;  
   float4 FogDensityParamsSky = cb12_v44;  
     
   float3 AerialColorFront = cb12_v45.xyz;  
   float3 AerialColorMiddle = cb12_v46.xyz;  
   float3 AerialColorBack = cb12_v47.xyz;  
   float4 AerialParams = cb12_v48;

   float3 frag_vec = fragPosWorldSpace.xyz - customCameraPos.xyz;  
   float frag_dist = length(frag_vec);  
     
   float3 frag_dir = frag_vec / frag_dist;  
   
   float dot_fragDirSunDir = dot(GlobalLightDirection.xyz, frag_dir);

   float3 curr_col_fog;  
   float3 curr_col_aerial;  
   {  
     float _dot = dot_fragDirSunDir;  
   
     float _dd = _dot;  
     {  
       const float _distOffset = -150;  
       const float _distRange = 500;  
       const float _mul = 1.0 / _distRange;  
       const float _bias = _distOffset * _mul;  
   
       _dd = abs(_dd);  
       _dd *= _dd;  
       _dd *= saturate( frag_dist * _mul + _bias );  
     }  
   
     curr_col_fog = lerp( FogColorMiddle.xyz, (_dot>0.0f ? FogColorFront.xyz : FogColorBack.xyz), _dd );  
     curr_col_aerial = lerp( AerialColorMiddle.xyz, (_dot>0.0f ? AerialColorFront.xyz : AerialColorBack.xyz), _dd );  
   }

   float fog_amount = 1;  
   float fog_amount_scale = 0;  
   [branch]  
   if ( frag_dist >= AerialParams.y )  
   {  
     float curr_pos_z_base = (customCameraPos.z + FogBaseParams.y) * density_factor;  
     float curr_pos_z_step = frag_step.z * density_factor;  
   
     [unroll]  
     for ( int i=16; i>0; --i )  
     {  
       fog_amount *= 1 - saturate( density_sample_scale / (1 + max( 0.0, curr_pos_z_base + (i) * curr_pos_z_step ) ) );  
     }  
   
     fog_amount = 1 - fog_amount;  
     fog_amount_scale = saturate( (frag_dist - AerialParams.y) * AerialParams.z );  
   }  
   
   FogResult ret;  
   
   ret.paramsFog = float4 ( curr_col_fog, fog_amount_scale * pow( abs(fog_amount), final_exp_fog ) );  
   ret.paramsAerial = float4 ( curr_col_aerial, fog_amount_scale * pow( abs(fog_amount), final_exp_aerial ) );

تجاوز الضباب

  109:  mad_sat r1.xy, r0.wwww, cb12[189].xzxx, cb12[189].ywyy  
  110:  add r5.xyz, -r3.xyzx, cb12[188].xyzx  
  111:  mad r5.xyz, r1.xxxx, r5.xyzx, r3.xyzx  
  112:  add r0.z, l(-1.000000), cb12[188].w  
  113:  mad r0.z, r1.y, r0.z, l(1.000000)  
  114:  mul_sat r5.w, r0.w, r0.z  
  115:  lt r0.z, l(0.000000), cb12[192].x  
  116:  if_nz r0.z  
  117:   mad_sat r1.xy, r0.wwww, cb12[191].xzxx, cb12[191].ywyy  
  118:   add r6.xyz, -r3.xyzx, cb12[190].xyzx  
  119:   mad r3.xyz, r1.xxxx, r6.xyzx, r3.xyzx  
  120:   add r0.z, l(-1.000000), cb12[190].w  
  121:   mad r0.z, r1.y, r0.z, l(1.000000)  
  122:   mul_sat r3.w, r0.w, r0.z  
  123:   add r1.xyzw, -r5.xyzw, r3.xyzw  
  124:   mad r5.xyzw, cb12[192].xxxx, r1.xyzw, r5.xyzw  
  125:  endif

 #ifdef OVERRIDE_FOG  
     
   // Override  
   float fog_influence = ret.paramsFog.w; // r0.w  
   
   float override1ColorScale = cb12_v189.x;  
   float override1ColorBias = cb12_v189.y;  
   float3 override1Color = cb12_v188.rgb;  
     
   float override1InfluenceScale = cb12_v189.z;  
   float override1InfluenceBias = cb12_v189.w;  
   float override1Influence = cb12_v188.w;  
     
   float override1ColorAmount = saturate(fog_influence * override1ColorScale + override1ColorBias);  
   float override1InfluenceAmount = saturate(fog_influence * override1InfluenceScale + override1InfluenceBias);    
     

   float4 paramsFogOverride;  
   paramsFogOverride.rgb = lerp(curr_col_fog, override1Color, override1ColorAmount ); // ***r5.xyz   
     
   float param1 = lerp(1.0, override1Influence, override1InfluenceAmount); // r0.x  
   paramsFogOverride.w = saturate(param1 * fog_influence ); // ** r5.w  
   
     
   const float extraFogOverride = cb12_v192.x;  
     
   [branch]   
   if (extraFogOverride > 0.0)  
   {  
     float override2ColorScale = cb12_v191.x;  
     float override2ColorBias = cb12_v191.y;  
     float3 override2Color = cb12_v190.rgb;  
     
     float override2InfluenceScale = cb12_v191.z;  
     float override2InfluenceBias = cb12_v191.w;  
     float override2Influence = cb12_v190.w;  
       
     float override2ColorAmount = saturate(fog_influence * override2ColorScale + override2ColorBias);  
     float override2InfluenceAmount = saturate(fog_influence * override2InfluenceScale + override2InfluenceBias);  
      

     float4 paramsFogOverride2;  
     paramsFogOverride2.rgb = lerp(curr_col_fog, override2Color, override2ColorAmount); // r3.xyz   
           
     float ov_param1 = lerp(1.0, override2Influence, override2InfluenceAmount); // r0.z  
     paramsFogOverride2.w = saturate(ov_param1 * fog_influence); // r3.w  
   
     paramsFogOverride = lerp(paramsFogOverride, paramsFogOverride2, extraFogOverride);  
   
   }  
   ret.paramsFog = paramsFogOverride;  
     
 #endif

تنظيم الانسداد المحيط

  13:  ld_indexable(texture2d)(float,float,float,float) r0.x, r0.xyzw, t2.xyzw  
  14:  max r0.x, r0.x, cb3[1].x  
  15:  add r0.yzw, r1.xxyz, -cb12[0].xxyz  
  16:  dp3 r1.x, r0.yzwy, r0.yzwy  
  17:  sqrt r1.x, r1.x  
  18:  add r1.y, r1.x, -cb3[0].x  
  19:  add r1.zw, -cb3[0].xxxz, cb3[0].yyyw  
  20:  div_sat r1.y, r1.y, r1.z  
  21:  mad r1.y, r1.y, r1.w, cb3[0].z  
  22:  add r0.x, r0.x, l(-1.000000)  
  23:  mad r0.x, r1.y, r0.x, l(1.000000)

 float AdjustAmbientOcclusion(in float inputAO, in float worldToCameraDistance)  
 {  
   // *** Inputs *** //  
   const float aoDistanceStart = cb3_v0.x;  
   const float aoDistanceEnd = cb3_v0.y;  
   const float aoStrengthStart = cb3_v0.z;  
   const float aoStrengthEnd = cb3_v0.w;  
      
   // * Adjust AO  
   float aoDistanceIntensity = linstep( aoDistanceStart, aoDistanceEnd, worldToCameraDistance );  
   float aoStrength = lerp(aoStrengthStart, aoStrengthEnd, aoDistanceIntensity);   
   float adjustedAO = lerp(1.0, inputAO, aoStrength);  
     
   return adjustedAO;   
 }

ضع كل شيء معا

   ...
   FogResult fog = CalculateFog( worldPos, CameraPosition, fogStart, ao, false );  
      
   // Apply AO to influence  
   fog.paramsFog.w *= ao;  
   fog.paramsAerial.w *= ao; 
      
   // Mix fog with scene color  
   outColor = ApplyFog(fog, colorHDR);

 float3 ApplyFog(FogResult fog, float3 color)  
 {  
   const float3 LuminanceFactors = float3(0.333f, 0.555f, 0.222f);  
   
   float3 aerialColor = dot(LuminanceFactors, color) * fog.paramsAerial.xyz;  
   color = lerp(color, aerialColor, fog.paramsAerial.w);  
   color = lerp(color, fog.paramsFog.xyz, fog.paramsFog.w);  
    
   return color.xyz;  
 }

بعض لقطات شاشة التصحيح

مجموع

الجزء 3. نجوم الرماية

1. نظرة عامة

2. الهندسة

 vs_5_0  
    dcl_globalFlags refactoringAllowed  
    dcl_constantbuffer cb1[9], immediateIndexed  
    dcl_constantbuffer cb2[3], immediateIndexed  
    dcl_constantbuffer cb12[193], immediateIndexed  
    dcl_input v0.xyz  
    dcl_input v1.xyzw  
    dcl_input v2.xy  
    dcl_input v3.xy  
    dcl_input v4.xy  
    dcl_input v5.xyz  
    dcl_input v6.x  
    dcl_input v7.x  
    dcl_output o0.xyzw  
    dcl_output o1.xyzw  
    dcl_output o2.xy  
    dcl_output o3.xyzw  
    dcl_output_siv o4.xyzw, position  
    dcl_temps 5  
   0: mov r0.xyz, v0.xyzx  
   1: mov r0.w, l(1.000000)  
   2: dp4 r1.x, r0.xyzw, cb2[0].xyzw  
   3: dp4 r1.y, r0.xyzw, cb2[1].xyzw  
   4: dp4 r1.z, r0.xyzw, cb2[2].xyzw  
   5: add r0.x, v2.x, v2.y  
   6: add r0.y, -v2.y, v2.x  
   7: add r2.xyz, -r1.zxyz, cb1[8].zxyz  
   8: dp3 r0.z, r2.xyzx, r2.xyzx  
   9: rsq r0.z, r0.z  
  10: mul r2.xyz, r0.zzzz, r2.xyzx  
  11: dp3 r0.z, v5.xyzx, v5.xyzx  
  12: rsq r0.z, r0.z  
  13: mul r3.xyz, r0.zzzz, v5.xyzx  
  14: mul r4.xyz, r2.xyzx, r3.yzxy  
  15: mad r2.xyz, r2.zxyz, r3.zxyz, -r4.xyzx  
  16: dp3 r0.z, r2.xyzx, r2.xyzx  
  17: rsq r0.z, r0.z  
  18: mul r2.xyz, r0.zzzz, r2.xyzx  
  19: mad r0.z, v7.x, v6.x, l(1.000000)  
  20: mul r3.xyz, r0.zzzz, r3.xyzx  
  21: mul r3.xyz, r3.xyzx, v3.xxxx  
  22: mul r2.xyz, r2.xyzx, v3.yyyy  
  23: mad r0.xzw, r3.xxyz, r0.xxxx, r1.xxyz  
  24: mad r0.xyz, r2.xyzx, r0.yyyy, r0.xzwx  
  25: mov r0.w, l(1.000000)  
  26: dp4 o4.x, r0.xyzw, cb1[0].xyzw  
  27: dp4 o4.y, r0.xyzw, cb1[1].xyzw  
  28: dp4 o4.z, r0.xyzw, cb1[2].xyzw  
  29: dp4 o4.w, r0.xyzw, cb1[3].xyzw  
  30: add r0.xyz, r0.xyzx, -cb12[0].xyzx  
  31: dp3 r0.w, r0.xyzx, r0.xyzx  
  32: sqrt r0.w, r0.w  
  33: div r0.xyz, r0.xyzx, r0.wwww  
  34: add r0.w, r0.w, -cb12[22].z  
  35: max r0.w, r0.w, l(0)  
  36: min r0.w, r0.w, cb12[42].z  
  37: dp3 r0.x, cb12[38].xyzx, r0.xyzx  
  38: mul r0.y, abs(r0.x), abs(r0.x)  
  39: mad_sat r1.x, r0.w, l(0.002000), l(-0.300000)  
  40: mul r0.y, r0.y, r1.x  
  41: lt r1.x, l(0), r0.x  
  42: movc r1.yzw, r1.xxxx, cb12[39].xxyz, cb12[41].xxyz  
  43: add r1.yzw, r1.yyzw, -cb12[40].xxyz  
  44: mad r1.yzw, r0.yyyy, r1.yyzw, cb12[40].xxyz  
  45: movc r2.xyz, r1.xxxx, cb12[45].xyzx, cb12[47].xyzx  
  46: add r2.xyz, r2.xyzx, -cb12[46].xyzx  
  47: mad o0.xyz, r0.yyyy, r2.xyzx, cb12[46].xyzx  
  48: ge r0.y, r0.w, cb12[48].y  
  49: if_nz r0.y  
  50:  mad r0.y, r0.z, cb12[22].z, cb12[0].z  
  51:  mul r0.z, r0.w, r0.z  
  52:  mul r0.z, r0.z, l(0.062500)  
  53:  mul r1.x, r0.w, cb12[43].x  
  54:  mul r1.x, r1.x, l(0.062500)  
  55:  add r0.x, r0.x, cb12[42].x  
  56:  add r2.x, cb12[42].x, l(1.000000)  
  57:  div_sat r0.x, r0.x, r2.x  
  58:  add r2.x, -cb12[43].z, cb12[43].y  
  59:  mad r0.x, r0.x, r2.x, cb12[43].z  
  60:  add r0.y, r0.y, cb12[42].y  
  61:  mul r2.x, r0.x, r0.y  
  62:  mul r0.z, r0.x, r0.z  
  63:  mad r3.xyzw, r0.zzzz, l(16.000000, 15.000000, 14.000000, 13.000000), r2.xxxx  
  64:  max r3.xyzw, r3.xyzw, l(0, 0, 0, 0)  
  65:  add r3.xyzw, r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  66:  div_sat r3.xyzw, r1.xxxx, r3.xyzw  
  67:  add r3.xyzw, -r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  68:  mul r2.y, r3.y, r3.x  
  69:  mul r2.y, r3.z, r2.y  
  70:  mul r2.y, r3.w, r2.y  
  71:  mad r3.xyzw, r0.zzzz, l(12.000000, 11.000000, 10.000000, 9.000000), r2.xxxx  
  72:  max r3.xyzw, r3.xyzw, l(0, 0, 0, 0)  
  73:  add r3.xyzw, r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  74:  div_sat r3.xyzw, r1.xxxx, r3.xyzw  
  75:  add r3.xyzw, -r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  76:  mul r2.y, r2.y, r3.x  
  77:  mul r2.y, r3.y, r2.y  
  78:  mul r2.y, r3.z, r2.y  
  79:  mul r2.y, r3.w, r2.y  
  80:  mad r3.xyzw, r0.zzzz, l(8.000000, 7.000000, 6.000000, 5.000000), r2.xxxx  
  81:  max r3.xyzw, r3.xyzw, l(0, 0, 0, 0)  
  82:  add r3.xyzw, r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  83:  div_sat r3.xyzw, r1.xxxx, r3.xyzw  
  84:  add r3.xyzw, -r3.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)  
  85:  mul r2.y, r2.y, r3.x  
  86:  mul r2.y, r3.y, r2.y  
  87:  mul r2.y, r3.z, r2.y  
  88:  mul r2.y, r3.w, r2.y  
  89:  mad r2.zw, r0.zzzz, l(0.000000, 0.000000, 4.000000, 3.000000), r2.xxxx  
  90:  max r2.zw, r2.zzzw, l(0, 0, 0, 0)  
  91:  add r2.zw, r2.zzzw, l(0.000000, 0.000000, 1.000000, 1.000000)  
  92:  div_sat r2.zw, r1.xxxx, r2.zzzw  
  93:  add r2.zw, -r2.zzzw, l(0.000000, 0.000000, 1.000000, 1.000000)  
  94:  mul r2.y, r2.z, r2.y  
  95:  mul r2.y, r2.w, r2.y  
  96:  mad r2.x, r0.z, l(2.000000), r2.x  
  97:  max r2.x, r2.x, l(0)  
  98:  add r2.x, r2.x, l(1.000000)  
  99:  div_sat r2.x, r1.x, r2.x  
  100:  add r2.x, -r2.x, l(1.000000)  
  101:  mul r2.x, r2.x, r2.y  
  102:  mad r0.x, r0.y, r0.x, r0.z  
  103:  max r0.x, r0.x, l(0)  
  104:  add r0.x, r0.x, l(1.000000)  
  105:  div_sat r0.x, r1.x, r0.x  
  106:  add r0.x, -r0.x, l(1.000000)  
  107:  mad r0.x, -r2.x, r0.x, l(1.000000)  
  108:  add r0.y, r0.w, -cb12[48].y  
  109:  mul_sat r0.y, r0.y, cb12[48].z  
  110: else  
  111:  mov r0.xy, l(1.000000, 0.000000, 0.000000, 0.000000)  
  112: endif  
  113: log r0.x, r0.x  
  114: mul r0.z, r0.x, cb12[42].w  
  115: exp r0.z, r0.z  
  116: mul r0.z, r0.z, r0.y  
  117: mul r0.x, r0.x, cb12[48].x  
  118: exp r0.x, r0.x  
  119: mul o0.w, r0.x, r0.y  
  120: mad_sat r0.xy, r0.zzzz, cb12[189].xzxx, cb12[189].ywyy  
  121: add r2.xyz, -r1.yzwy, cb12[188].xyzx  
  122: mad r2.xyz, r0.xxxx, r2.xyzx, r1.yzwy  
  123: add r0.x, cb12[188].w, l(-1.000000)  
  124: mad r0.x, r0.y, r0.x, l(1.000000)  
  125: mul_sat r2.w, r0.x, r0.z  
  126: lt r0.x, l(0), cb12[192].x  
  127: if_nz r0.x  
  128:  mad_sat r0.xy, r0.zzzz, cb12[191].xzxx, cb12[191].ywyy  
  129:  add r3.xyz, -r1.yzwy, cb12[190].xyzx  
  130:  mad r1.xyz, r0.xxxx, r3.xyzx, r1.yzwy  
  131:  add r0.x, cb12[190].w, l(-1.000000)  
  132:  mad r0.x, r0.y, r0.x, l(1.000000)  
  133:  mul_sat r1.w, r0.x, r0.z  
  134:  add r0.xyzw, -r2.xyzw, r1.xyzw  
  135:  mad o1.xyzw, cb12[192].xxxx, r0.xyzw, r2.xyzw  
  136: else  
  137:  mov o1.xyzw, r2.xyzw  
  138: endif  
  139: mov o3.xyzw, v1.xyzw  
  140: mov o2.xy, v4.yxyy  
  141: ret

   7: add r2.xyz, -r1.zxyz, cb1[8].zxyz  
   8: dp3 r0.z, r2.xyzx, r2.xyzx  
   9: rsq r0.z, r0.z  
  10: mul r2.xyz, r0.zzzz, r2.xyzx

  11: dp3 r0.z, v5.xyzx, v5.xyzx  
  12: rsq r0.z, r0.z  
  13: mul r3.xyz, r0.zzzz, v5.xyzx

  14: mul r4.xyz, r2.xyzx, r3.yzxy  
  15: mad r2.xyz, r2.zxyz, r3.zxyz, -r4.xyzx  
  16: dp3 r0.z, r2.xyzx, r2.xyzx  
  17: rsq r0.z, r0.z  
  18: mul r2.xyz, r0.zzzz, r2.xyzx

  19: mad r0.z, v7.x, v6.x, l(1.000000)  
  20: mul r3.xyz, r0.zzzz, r3.xyzx  
  21: mul r3.xyz, r3.xyzx, v3.xxxx  
  22: mul r2.xyz, r2.xyzx, v3.yyyy  
  23: mad r0.xzw, r3.xxyz, r0.xxxx, r1.xxyz  
  24: mad r0.xyz, r2.xyzx, r0.yyyy, r0.xzwx  
  25: mov r0.w, l(1.000000) 

  26: dp4 o4.x, r0.xyzw, cb1[0].xyzw  
  27: dp4 o4.y, r0.xyzw, cb1[1].xyzw  
  28: dp4 o4.z, r0.xyzw, cb1[2].xyzw  
  29: dp4 o4.w, r0.xyzw, cb1[3].xyzw  

3. بيكسل شادر

 ps_5_0  
    dcl_globalFlags refactoringAllowed  
    dcl_constantbuffer cb0[10], immediateIndexed  
    dcl_constantbuffer cb2[3], immediateIndexed  
    dcl_constantbuffer cb4[2], immediateIndexed  
    dcl_input_ps linear v0.xyzw  
    dcl_input_ps linear v1.xyzw  
    dcl_input_ps linear v2.y  
    dcl_input_ps linear v3.w  
    dcl_output o0.xyzw  
    dcl_temps 4  
   0: mov_sat r0.x, v2.y  
   1: ge r0.y, r0.x, l(0.052579)  
   2: ge r0.z, l(0.965679), r0.x  
   3: and r0.y, r0.z, r0.y  
   4: if_nz r0.y  
   5:  ge r0.y, l(0.878136), r0.x  
   6:  add r0.z, r0.x, l(-0.052579)  
   7:  mul r1.w, r0.z, l(1.211303)  
   8:  mov_sat r0.z, r1.w  
   9:  mad r0.w, r0.z, l(-2.000000), l(3.000000)  
  10:  mul r0.z, r0.z, r0.z  
  11:  mul r0.z, r0.z, r0.w  
  12:  mul r2.x, r0.z, l(0.084642)  
  13:  mov r1.yz, l(0.000000, 0.000000, 0.084642, 0.000000)  
  14:  movc r2.yzw, r0.yyyy, r1.yyzw, l(0.000000, 0.000000, 0.000000, 0.500000)  
  15:  not r0.z, r0.y  
  16:  if_z r0.y  
  17:   ge r0.y, l(0.924339), r0.x  
  18:   add r0.w, r0.x, l(-0.878136)  
  19:   mul r1.w, r0.w, l(21.643608)  
  20:   mov_sat r0.w, r1.w  
  21:   mad r3.x, r0.w, l(-2.000000), l(3.000000)  
  22:   mul r0.w, r0.w, r0.w  
  23:   mul r0.w, r0.w, r3.x  
  24:   mad r1.x, r0.w, l(0.889658), l(0.084642)  
  25:   mov r1.yz, l(0.000000, 0.084642, 0.974300, 0.000000)  
  26:   movc r2.xyzw, r0.yyyy, r1.xyzw, r2.xyzw  
  27:  else  
  28:   mov r2.y, l(0)  
  29:   mov r0.y, l(-1)  
  30:  endif  
  31:  not r0.w, r0.y  
  32:  and r0.z, r0.w, r0.z  
  33:  if_nz r0.z  
  34:   ge r0.y, r0.x, l(0.924339)  
  35:   add r0.x, r0.x, l(-0.924339)  
  36:   mul r1.w, r0.x, l(24.189651)  
  37:   mov_sat r0.x, r1.w  
  38:   mad r0.z, r0.x, l(-2.000000), l(3.000000)  
  39:   mul r0.x, r0.x, r0.x  
  40:   mul r0.x, r0.x, r0.z  
  41:   mad r1.x, r0.x, l(-0.974300), l(0.974300)  
  42:   mov r1.yz, l(0.000000, 0.974300, 0.000000, 0.000000)  
  43:   movc r2.xyzw, r0.yyyy, r1.xyzw, r2.xyzw  
  44:  endif  
  45: else  
  46:  mov r2.yzw, l(0.000000, 0.000000, 0.000000, 0.500000)  
  47:  mov r0.y, l(0)  
  48: endif  
  49: mov_sat r2.w, r2.w  
  50: mad r0.x, r2.w, l(-2.000000), l(3.000000)  
  51: mul r0.z, r2.w, r2.w  
  52: mul r0.x, r0.z, r0.x  
  53: add r0.z, -r2.y, r2.z  
  54: mad r0.x, r0.x, r0.z, r2.y  
  55: movc r0.x, r0.y, r2.x, r0.x  
  56: mad r0.y, cb4[1].x, -cb0[9].w, l(1.000000)  
  57: mul_sat r0.y, r0.y, v3.w  
  58: mul r0.x, r0.y, r0.x  
  59: mul r0.yzw, cb2[2].xxyz, cb4[0].xxxx  
  60: mul r0.x, r0.x, cb2[2].w  
  61: dp3 r1.x, l(0.333000, 0.555000, 0.222000, 0.000000), r0.yzwy  
  62: mad r1.xyz, r1.xxxx, v0.xyzx, -r0.yzwy  
  63: mad r0.yzw, v0.wwww, r1.xxyz, r0.yyzw  
  64: add r1.xyz, -r0.yzwy, v1.xyzx  
  65: mad r0.yzw, v1.wwww, r1.xxyz, r0.yyzw  
  66: mul o0.xyz, r0.xxxx, r0.yzwy  
  67: mov o0.w, r0.x  
  68: ret

   // current status: no idea how these are generated  
   const float controlPoint0 = 0.052579;  
   const float controlPoint1 = 0.878136;  
   const float controlPoint2 = 0.924339;  
   const float controlPoint3 = 0.965679;

   // Input for the opacity function
   float y = saturate(Input.Texcoords.y);  // r0.x
     
   // Value of opacity function.  
   // 0 - no change  
   // 1 - full color  
   float opacity = 0.0;  
     
   [branch]   
   if (y >= controlPoint0 && y <= controlPoint3)  
   {  
      ...

   6: add r0.z, r0.x, l(-0.052579)   
   7: mul r1.w, r0.z, l(1.211303)   
   8: mov_sat r0.z, r1.w   
   9: mad r0.w, r0.z, l(-2.000000), l(3.000000)   
  10: mul r0.z, r0.z, r0.z   
  11: mul r0.z, r0.z, r0.w   
  12: mul r2.x, r0.z, l(0.084642)

 float linstep(float min, float max, float v)  
 {  
   return ( (v-min) / (max-min) );  
 }

 float getOpacityFunctionValue(float x, float cpLeft, float cpRight, float weight)  
 {  
   float val = smoothstep( 0, 1, linstep(cpLeft, cpRight, x) );  
   return val * weight;  
 }

   const float weight0 = 0.084642;  
   const float weight1 = 0.889658;  
   const float weight2 = 0.974300; // note: weight0+weight1 = weight2

   float opacity = 0.0;

   [branch]   
   if (y >= controlPoint0 && y <= controlPoint3)  
   {  
     // Range of v: [0, weight0]  
     float v = getOpacityFunctionValue(y, controlPoint0, controlPoint1, weight0);  
     opacity = v;  
     
     [branch]  
     if ( y >= controlPoint1 )  
     {  
       // Range of v: [0, weight1]  
       float v = getOpacityFunctionValue(y, controlPoint1, controlPoint2, weight1);  
       opacity = weight0 + v;  
   
       [branch]  
       if (y >= controlPoint2)  
       {  
         // Range of v: [0, weight2]  
         float v = getOpacityFunctionValue(y, controlPoint2, controlPoint3, weight2);
         opacity = weight2 - v;          
       }  
     }  
   }

   // cb4_v1.x = 1.0  
   float starsOpacity = 1.0 - cb0_v9.w * cb4_v1.x;    
   opacity *= starsOpacity;  

   // Calculate color of a shooting star  
   // cb4_v0.x = 10.0
   // cb2_v2.rgb = (1.0, 1.0, 1.0)
   float3 color = cb2_v2.rgb * cb4_v0.x;
     
   // cb2_v2.w = 1  
   opacity *= cb2_v2.w;
     
   FogResult fr = { Input.FogParams, Input.AerialParams };  
   color = ApplyFog(fr, color);
     
   return float4( color*opacity, opacity);  
 }

4. ملخص