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Use the SRL texture API

/main
Evgenii Golubev 8 年前
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3e4e0ca6
共有 1 个文件被更改，包括 33 次插入 和 83 次删除
  1. 116
      Assets/ScriptableRenderLoop/HDRenderLoop/Sky/Resources/AtmosphericScattering.hlsl

116
Assets/ScriptableRenderLoop/HDRenderLoop/Sky/Resources/AtmosphericScattering.hlsl
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#define ATMOSPHERICS_DBG_RAYLEIGH 4
#define ATMOSPHERICS_DBG_MIE 5
#define ATMOSPHERICS_DBG_HEIGHT 6
uniform int _AtmosphericsDebugMode;
uniform int _AtmosphericsDebugMode;
uniform float3 _SunDirection;

uniform float _OcclusionDepthThreshold;
TEXTURE2D(_OcclusionTexture);
uniform sampler2D _CameraDepthTexture;
uniform float _WorldScaleExponent;
uniform float _WorldNormalDistanceRcp;

uniform float3 _MieColorO00;
uniform float3 _MieColorP20;
uniform float3 _MieColorP45;
uniform float _HeightNormalDistanceRcp;
uniform float _HeightNearScatterPush;
uniform float _HeightRayleighDensity;

uniform float4 _HeightRayleighColor;
SAMPLER2D(sampler_CameraDepthTexture)
#define SRL_BilinearSampler sampler_CameraDepthTexture // Used for all textures
TEXTURE2D(_CameraDepthTexture);
TEXTURE2D(_OcclusionTexture);
float HenyeyGreensteinPhase(float g, float cosTheta) {
float gSqr = g * g;
float a1 = (1.f - gSqr);

return (a1 / a2) * (b1 / b2);
return (a1 / a2) * (b1 / b2);
}
float RayleighPhase(float cosTheta) {

const float3 worldDir = worldVec / worldVecLen;
const float3 worldDirUnscaled = normalize(worldPos - _WorldSpaceCameraPos.xyz);
const float viewSunCos = dot(worldDirUnscaled, _SunDirection);
const float rayleighPh = min(1.f, RayleighPhase(viewSunCos) * 12.f);
const float miePh = MiePhase(viewSunCos, _MiePhaseAnisotropy);

const float angleY = worldDir.y * saturate(worldVecLen / 250.0);
float3 mieColor;
if(angleY >= 0.f) mieColor = lerp(_MieColorO00, _MieColorP20, saturate(angleY / angle20));
else mieColor = lerp(_MieColorM20, _MieColorO00, saturate((angleY + angle20) / angle20));

rayleighColor = lerp(Luminance(rayleighColor).rrr, rayleighColor, saturate(pushedDistance * _WorldNormalDistanceRcp));
float3 heightRayleighColor = lerp(Luminance(_HeightRayleighColor.xyz).rrr, _HeightRayleighColor.xyz, saturate(pushedHeightDistance * _HeightNormalDistanceRcp));
coords1.rgb = rayleighScatter * rayleighColor;
coords1.a = rayleighScatter;

void VolundTransferScatter(float3 scaledWorldPos, out float4 coords1) {
float4 c1, c2, c3;
VolundTransferScatter(scaledWorldPos, c1, c2, c3);
#ifdef IS_RENDERING_SKY
coords1.rgb = c3.rgb;
coords1.a = max(0.f, 1.f - c3.a * _HeightExtinctionFactor);

}
float2 UVFromPos(float2 pos) {
#if defined(UNITY_PASS_FORWARDBASE)
return pos;
#else
#endif
}
float3 VolundApplyScatter(float4 coords1, float2 pos, float3 color) {

void VolundTransferScatterOcclusion(float3 scaledWorldPos, out float4 coords1, out float3 coords2) {
float4 c1, c2, c3;
VolundTransferScatter(scaledWorldPos, c1, c2, c3);
coords2.rgb = c3.rgb + c1.rgb * _RayleighInScatterPct.y;
#ifdef ATMOSPHERICS_DEBUG

float VolundSampleScatterOcclusion(float2 pos) {
#if defined(ATMOSPHERICS_OCCLUSION)
float2 uv = UVFromPos(pos);
#if defined(ATMOSPHERICS_OCCLUSION_EDGE_FIXUP) && defined(SHADER_API_D3D11) && SHADER_TARGET > 40
#if defined(ATMOSPHERICS_OCCLUSION_EDGE_FIXUP)
float cDepth = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, baseUV);
float cDepth = SAMPLE_TEXTURE2D_LOD(_CameraDepthTexture, SRL_BilinearSampler, baseUV, 0.f).r;
baseUV.xy = uv + _DepthTextureScaledTexelSize.zy; xDepth.x = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.xy; xDepth.y = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.xw; xDepth.z = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.zw; xDepth.w = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.zy; xDepth.x = SAMPLE_TEXTURE2D_LOD(_CameraDepthTexture, SRL_BilinearSampler, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.xy; xDepth.y = SAMPLE_TEXTURE2D_LOD(_CameraDepthTexture, SRL_BilinearSampler, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.xw; xDepth.z = SAMPLE_TEXTURE2D_LOD(_CameraDepthTexture, SRL_BilinearSampler, baseUV);
baseUV.xy = uv + _DepthTextureScaledTexelSize.zw; xDepth.w = SAMPLE_TEXTURE2D_LOD(_CameraDepthTexture, SRL_BilinearSampler, baseUV);
return _OcclusionTexture.SampleLevel(sampler_OcclusionTexture, uv, 0.f);
return SAMPLE_TEXTURE2D_LOD(_OcclusionTexture, SRL_BilinearSampler, uv, 0.f).r;
float4 occ = _OcclusionTexture.Gather(sampler_OcclusionTexture, uv);
float4 occ = GATHER_TEXTURE2D(_OcclusionTexture, SRL_BilinearSampler, uv);
#else
return UNITY_SAMPLE_TEX2D(_OcclusionTexture, uv).r;
#endif
#else //defined(ATMOSPHERICS_OCCLUSION)
return 1.f;
#endif //defined(ATMOSPHERICS_OCCLUSION)

float occlusion = VolundSampleScatterOcclusion(pos);
#ifdef ATMOSPHERICS_DEBUG
if(_AtmosphericsDebugMode == ATMOSPHERICS_DBG_SCATTERING)
return coords1.rgb + coords2.rgb;

#endif
color.rgb = color.rgb * coords1.a + coords1.rgb * min(1.f, occlusion + _ShadowBias) + coords2.rgb * min(1.f, occlusion + _ShadowBiasIndirect);
float cloudOcclusion = min(1.f, occlusion + _ShadowBiasClouds);
color.a *= cloudOcclusion;

#define VOLUND_TRANSFER_SCATTER(pos, o) VolundTransferScatter(pos, o.scatterCoords1)
#define VOLUND_APPLY_SCATTER(i, color) color = VolundApplyScatter(i.scatterCoords1, i.pos.xy, color)
#define VOLUND_CLOUD_SCATTER(i, color) color = VolundApplyCloudScatter(i.scatterCoords1, color)
#endif
#endif
// Surface shader macros (specifically do nothing for deferred as that needs post-support)
#if defined(ATMOSPHERICS)
#if defined(UNITY_PASS_FORWARDBASE) && defined(ATMOSPHERICS_OCCLUSION)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float4 scatterCoords1; float3 scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o) VolundTransferScatterOcclusion(pos, o.scatterCoords1, o.scatterCoords2)
/* we can't fit screenPos interpolator, so calculate per-pixel. if only we had vpos available.. */
#define SURFACE_SCATTER_APPLY(i, color) { \
float4 scatterPos = ComputeScreenPos(mul(UNITY_MATRIX_VP, float4(i.scaledWorldPos, 1.f))); \
color = VolundApplyScatterOcclusion(i.scatterCoords1, i.scatterCoords2, scatterPos.xy / scatterPos.w, color); \
}
#elif defined(UNITY_PASS_FORWARDBASE)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float4 scatterCoords1; float scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o) VolundTransferScatter(pos, o.scatterCoords1)
#define SURFACE_SCATTER_APPLY(i, color) { \
float4 scatterPos = ComputeScreenPos(mul(UNITY_MATRIX_VP, float4(i.scaledWorldPos, 1.f))); \
color = VolundApplyScatter(i.scatterCoords1, scatterPos.xy / scatterPos.w, color); \
}
#elif defined(UNITY_PASS_FORWARDADD)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float scatterCoords1; float scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o) { float4 scatterCoords; VolundTransferScatter(pos, scatterCoords); o.scatterCoords1 = scatterCoords.a; }
#define SURFACE_SCATTER_APPLY(i, color) color = VolundApplyScatterAdd(i.scatterCoords1, color)
#endif
#elif defined(ATMOSPHERICS_PER_PIXEL)
#if defined(UNITY_PASS_FORWARDBASE) && defined(ATMOSPHERICS_OCCLUSION)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float scatterCoords1; float scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o)
#define SURFACE_SCATTER_APPLY(i, color) { \
float4 scatterPos = ComputeScreenPos(mul(UNITY_MATRIX_VP, float4(i.scaledWorldPos, 1.f))); \
float4 scatterCoords1; float3 scatterCoords2; VolundTransferScatterOcclusion(i.scaledWorldPos, scatterCoords1, scatterCoords2); \
color = VolundApplyScatterOcclusion(scatterCoords1, scatterCoords2, scatterPos.xy / scatterPos.w, color); \
}
#elif defined(UNITY_PASS_FORWARDBASE)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float scatterCoords1; float scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o)
#define SURFACE_SCATTER_APPLY(i, color) { \
float4 scatterCoords1; VolundTransferScatter(i.scaledWorldPos, scatterCoords1); \
float4 scatterPos = ComputeScreenPos(mul(UNITY_MATRIX_VP, float4(i.scaledWorldPos, 1.f))); \
color = VolundApplyScatter(scatterCoords1, scatterPos.xy / scatterPos.w, color); \
}
#elif defined(UNITY_PASS_FORWARDADD)
#define SURFACE_SCATTER_COORDS float3 scaledWorldPos; float scatterCoords1; float scatterCoords2;
#define SURFACE_SCATTER_TRANSFER(pos, o)
#define SURFACE_SCATTER_APPLY(i, color) { \
float4 scatterCoords1; VolundTransferScatter(i.scaledWorldPos, scatterCoords1); \
color = VolundApplyScatterAdd(scatterCoords1.a, color); \
}
#endif
#endif

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