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#ifndef MOCHIE_STANDARD_SSR_INCLUDED
#define MOCHIE_STANDARD_SSR_INCLUDED
/*
* MIT License
*
* Copyright (c) 2020 MochiesCode
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE
* SOFTWARE.
*/
//-----------------------------------------------------------------------------------
// SCREEN SPACE REFLECTIONS
//
// Original made by error.mdl, Toocanzs, and Xiexe.
// Reworked and updated by Mochie
//-----------------------------------------------------------------------------------
#if SSR_ENABLED
bool IsInMirror(){
return unity_CameraProjection[2][0] != 0.f || unity_CameraProjection[2][1] != 0.f;
}
float3 GetBlurredGP(const sampler2D ssrg, const float2 texelSize, const float2 uvs, const float dim){
float2 pixSize = 2/texelSize;
float dimFloored = floor(dim);
float center = floor(dim*0.5);
float3 refTotal = float3(0,0,0);
for (int i = 0; i < dimFloored; i++){
for (int j = 0; j < dimFloored; j++){
float4 refl = tex2Dlod(ssrg, float4(uvs.x + pixSize.x*(i-center), uvs.y + pixSize.y*(j-center),0,0));
refTotal += refl.rgb;
}
}
return refTotal/(dimFloored*dimFloored);
}
float4 ReflectRay(float3 reflectedRay, float3 rayDir, float _LRad, float _SRad, float _Step, float noise, const int maxIterations){
#if UNITY_SINGLE_PASS_STEREO || defined(UNITY_STEREO_INSTANCING_ENABLED) || defined(UNITY_STEREO_MULTIVIEW_ENABLED)
half x_min = 0.5*unity_StereoEyeIndex;
half x_max = 0.5 + 0.5*unity_StereoEyeIndex;
#else
half x_min = 0.0;
half x_max = 1.0;
#endif
reflectedRay = mul(UNITY_MATRIX_V, float4(reflectedRay, 1));
rayDir = mul(UNITY_MATRIX_V, float4(rayDir, 0));
int totalIterations = 0;
int direction = 1;
float3 finalPos = 0;
float step = _Step;
float lRad = _LRad;
float sRad = _SRad;
for (int i = 0; i < maxIterations; i++){
totalIterations = i;
float4 spos = ComputeGrabScreenPos(mul(UNITY_MATRIX_P, float4(reflectedRay, 1)));
float2 uvDepth = spos.xy / spos.w;
UNITY_BRANCH
if (uvDepth.x > x_max || uvDepth.x < x_min || uvDepth.y > 1 || uvDepth.y < 0){
break;
}
float rawDepth = DecodeFloatRG(SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture,float4(uvDepth,0,0)));
float linearDepth = Linear01Depth(rawDepth);
float sampleDepth = -reflectedRay.z;
float realDepth = linearDepth * _ProjectionParams.z;
float depthDifference = abs(sampleDepth - realDepth);
if (depthDifference < lRad){
if (direction == 1){
if(sampleDepth > (realDepth - sRad)){
if(sampleDepth < (realDepth + sRad)){
finalPos = reflectedRay;
break;
}
direction = -1;
step = step*0.1;
}
}
else {
if(sampleDepth < (realDepth + sRad)){
direction = 1;
step = step*0.1;
}
}
}
reflectedRay = reflectedRay + direction*step*rayDir;
step += step*(0.025 + 0.005*noise);
lRad += lRad*(0.025 + 0.005*noise);
sRad += sRad*(0.025 + 0.005*noise);
}
return float4(finalPos, totalIterations);
}
float4 GetSSR(const float3 wPos, const float3 viewDir, float3 rayDir, const half3 faceNormal, float smoothness, float3 albedo, float metallic, float2 screenUVs, float4 screenPos){
float FdotR = dot(faceNormal, rayDir.xyz);
float roughness = 1-smoothness;
UNITY_BRANCH
if (IsInMirror() || FdotR < 0 || roughness > 0.65){
return 0;
}
else {
float4 noiseUvs = screenPos;
noiseUvs.xy = (noiseUvs.xy * _GrabTexture_TexelSize.zw) / (_NoiseTexSSR_TexelSize.zw * noiseUvs.w);
float4 noiseRGBA = tex2Dlod(_NoiseTexSSR, float4(noiseUvs.xy,0,0));
float noise = noiseRGBA.r;
float3 reflectedRay = wPos + (_SSRHeight*_SSRHeight/FdotR + noise*_SSRHeight)*rayDir;
float4 finalPos = ReflectRay(reflectedRay, rayDir, _SSRHeight, 0.02, _SSRHeight, noise, 50);
float totalSteps = finalPos.w;
finalPos.w = 1;
if (!any(finalPos.xyz)){
return 0;
}
float4 uvs = UNITY_PROJ_COORD(ComputeGrabScreenPos(mul(UNITY_MATRIX_P, finalPos)));
uvs.xy = uvs.xy / uvs.w;
#if UNITY_SINGLE_PASS_STEREO || defined(UNITY_STEREO_INSTANCING_ENABLED) || defined(UNITY_STEREO_MULTIVIEW_ENABLED)
float xfade = 1;
#else
float xfade = smoothstep(0, _EdgeFade, uvs.x) * smoothstep(1, 1-_EdgeFade, uvs.x); //Fade x uvs out towards the edges
#endif
float yfade = smoothstep(0, _EdgeFade, uvs.y)*smoothstep(1, 1-_EdgeFade, uvs.y); //Same for y
// float lengthFade = smoothstep(1, 0, 2*(totalSteps / 50)-1);
float smoothFade = smoothstep(0.65, 0.5, 1-smoothness);
float reflectionAlpha = xfade * yfade * smoothFade; // * lengthFade;
float4 reflection = 0;
if (reflectionAlpha > 0){
float blurFac = max(1,min(12, 12 * (-2)*(smoothness-1)));
// if (blurFac > 1){
reflection.rgb = GetBlurredGP(_GrabTexture, _GrabTexture_TexelSize.zw, uvs.xy, blurFac);
// }
// else {
// reflection.rgb = tex2Dlod(_GrabTexture, float4(uvs.xy,0,0)).rgb;
// }
reflection.rgb = lerp(reflection.rgb, reflection.rgb*albedo.rgb,smoothstep(0, 1.75, metallic));
reflection.a = reflectionAlpha;
}
return max(0,reflection);
}
}
#endif
#endif // MOCHIE_STANDARD_SSR_INCLUDED
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