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Merge pull request #457 from Unity-Technologies/revert-455-feature/transparency

Revert "Use LOAD_TEXTURE2D to get depth from depth pyramid, fixed roughness t…"
/main
GitHub 7 年前
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468b9b08
共有 2 个文件被更改,包括 12 次插入18 次删除
  1. 9
      ScriptableRenderPipeline/Core/ShaderLibrary/ImageBasedLighting.hlsl
  2. 21
      ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

9
ScriptableRenderPipeline/Core/ShaderLibrary/ImageBasedLighting.hlsl


// approximating the cone of the specular lobe, and then computing the MIP map level
// which (approximately) covers the footprint of the lobe with a single texel.
// Improves the perceptual roughness distribution.
float PerceptualRoughnessToMipmapLevel(float perceptualRoughness, uint mipMapCount)
float PerceptualRoughnessToMipmapLevel(float perceptualRoughness)
return perceptualRoughness * mipMapCount;
}
float PerceptualRoughnessToMipmapLevel(float perceptualRoughness)
{
return PerceptualRoughnessToMipmapLevel(perceptualRoughness, UNITY_SPECCUBE_LOD_STEPS);
return perceptualRoughness * UNITY_SPECCUBE_LOD_STEPS;
}
// The *accurate* version of the non-linear remapping. It works by

21
ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl


// Color pyramid (width, height, lodcount, Unused)
float4 _GaussianPyramidColorMipSize;
TEXTURE2D(_GaussianPyramidColorTexture);
SAMPLER2D(sampler_GaussianPyramidColorTexture);
SAMPLER2D(sampler_PyramidDepthTexture);
SamplerState ltc_trilinear_clamp_sampler;
// TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)
TEXTURE2D(_PreIntegratedFGD);
TEXTURE2D_ARRAY(_LtcData); // We pack the 3 Ltc data inside a texture array

float3 refractedBackPointWS = float3(0.0, 0.0, 0.0);
float opticalDepth = 0.0;
uint2 depthSize = uint2(_PyramidDepthMipSize.xy);
// For all refraction approximation, to calculate the refracted point in world space,
// we approximate the scene as a plane (back plane) with normal -V at the depth hit point.
// (We avoid to raymarch the depth texture to get the refracted point.)

float3 R = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
// Get the depth of the approximated back plane
float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
// Distance from point to the back plane

// So the light is refracted twice: in and out of the tangent sphere
// Get the depth of the approximated back plane
float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
// Distance from point to the back plane

float3 R = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
// Get the depth of the approximated back plane
float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
// Distance from point to the back plane

// Calculate screen space coordinates of refracted point in back plane
float4 refractedBackPointCS = mul(_ViewProjMatrix, float4(refractedBackPointWS, 1.0));
float2 refractedBackPointSS = ComputeScreenSpacePosition(refractedBackPointCS);
float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointSS * depthSize, 0).r, _ZBufferParams);
float refractedBackPointDepth = LinearEyeDepth(SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, refractedBackPointSS, 0.0).r, _ZBufferParams);
// Exit if texel is out of color buffer
// Or if the texel is from an object in front of the object

{
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, posInput.positionSS, 0.0).rgb;
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, posInput.positionSS, 0.0).rgb;
float mipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness, uint(_GaussianPyramidColorMipSize.z));
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, refractedBackPointSS, mipLevel).rgb;
float mipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness);
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, refractedBackPointSS.xy, mipLevel).rgb;
// Beer-Lamber law for absorption
float3 transmittance = exp(-bsdfData.absorptionCoefficient * opticalDepth);

// Use perfect flat transparency when we cannot fetch the correct pixel color for the refracted point
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, posInput.positionSS, 0.0).rgb;
diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, posInput.positionSS, 0.0).rgb;
#endif
}

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