feat(vr): reproject stereo

features/Extended Materials/Shaders/ExtendedMaterials/ExtendedMaterials.hlsli

@@ -325,6 +325,7 @@ namespace ExtendedMaterials
 	float2 GetParallaxCoords(float distance, float2 coords, float mipLevel, float3 viewDir, float3x3 tbn, float noise, Texture2D<float4> tex, SamplerState texSampler, uint channel, DisplacementParams params, out float pixelOffset)
 #endif
 	{
+		pixelOffset = 0.5;
 		float3 viewDirTS = normalize(mul(tbn, viewDir));
 #if defined(LANDSCAPE)
 		viewDirTS.xy /= viewDirTS.z * 0.7 + 0.3 + params[0].FlattenAmount;  // Fix for objects at extreme viewing angles
@@ -496,7 +497,7 @@ namespace ExtendedMaterials
 #endif
 				nearBlendToFar *= nearBlendToFar;
 			float offset = (1.0 - parallaxAmount) * -maxHeight + minHeight;
-			pixelOffset = lerp(parallaxAmount * scale, 0, nearBlendToFar);
+			pixelOffset = saturate(lerp(parallaxAmount, 0.5, nearBlendToFar));
 			return lerp(viewDirTS.xy * offset + coords.xy, coords, nearBlendToFar);
 		}
 
@@ -509,7 +510,7 @@ namespace ExtendedMaterials
 		weights[5] = input.LandBlendWeights2.y;
 #endif
 
-		pixelOffset = 0;
+		pixelOffset = 0.5;
 		return coords;
 	}
 

package/Shaders/Common/Math.hlsli

@@ -3,10 +3,13 @@
 
 #define EPSILON_SSS_ALBEDO 1e-3f   // For albedo clamping in SSS calculations
 #define EPSILON_DOT_CLAMP 1e-5f    // For dot product clamping
+#define EPSILON_DEPTH_SKY 1e-5f    // Depth threshold for sky/unrendered pixel detection (raw reversed-Z near zero)
 #define EPSILON_DIVISION 1e-6f     // For division to avoid division by zero
 #define EPSILON_GLINTS 1e-8f       // For glints calculations
 #define EPSILON_WEIGHT_SUM 1e-10f  // For weight normalization
 
+#define DEPTH_SKY_SENTINEL 999999.0f  // Linearized depth sentinel for sky/unmapped pixels (beyond any real geometry)
+
 namespace Math
 {
 	static const float4x4 IdentityMatrix = {

package/Shaders/Common/SharedData.hlsli

@@ -23,7 +23,7 @@ namespace SharedData
 		bool InInterior;  // If the area lacks a directional shadow light e.g. the sun or moon
 		bool InMapMenu;   // If the world/local map is open (note that the renderer is still deferred here)
 		bool HideSky;     // HideSky flag in WorldSpace, e.g. Blackreach
-		float MipBias;    // Offset to mip level for TAA sharpness#
+		float MipBias;    // Offset to mip level for TAA sharpness
 		float pad0;
 		float4 AmbientSHR;
 		float4 AmbientSHG;
@@ -52,7 +52,7 @@ namespace SharedData
 		bool EnableShadows;
 		bool ExtendShadows;
 		bool EnableParallaxWarpingFix;
-		float1 pad0;
+		bool pad0;
 	};
 
 	struct CubemapCreatorSettings

package/Shaders/DeferredCompositeCS.hlsl

@@ -19,6 +19,11 @@ RWTexture2D<float4> NormalTAAMaskSpecularMaskRW : register(u1);
 RWTexture2D<float2> MotionVectorsRW : register(u2);
 Texture2D<float> DepthTexture : register(t4);
 
+#if defined(VR_STEREO_OPT)
+#	include "VRStereoOptimizations/modes.hlsli"
+Texture2D<uint> StereoOptModeTexture : register(t16);
+#endif
+
 #if defined(DYNAMIC_CUBEMAPS)
 Texture2D<float3> ReflectanceTexture : register(t5);
 TextureCube<float3> EnvTexture : register(t6);
@@ -92,6 +97,16 @@ void SampleSSGISpecular(uint2 pixCoord, sh2 lobe, inout float ao, out float3 il,
 	uv *= FrameBuffer::DynamicResolutionParams2.xy;  // adjust for dynamic res
 
 	uint eyeIndex = Stereo::GetEyeIndexFromTexCoord(uv);
+
+#if defined(VR_STEREO_OPT)
+	if (eyeIndex == 1) {
+		uint mode = StereoOptModeTexture[uint2(dispatchID.xy)] & 0x0F;
+		if (mode == MODE_MAIN) {  // stencil-culled in Eye 1, filled by ReprojectionCS
+			return;
+		}
+	}
+#endif
+
 	uv = Stereo::ConvertFromStereoUV(uv, eyeIndex);
 
 	float3 normalGlossiness = NormalRoughnessTexture[dispatchID.xy];

package/Shaders/Lighting.hlsl

@@ -3166,7 +3166,15 @@ PS_OUTPUT main(PS_INPUT input, bool frontFace : SV_IsFrontFace)
 	}
 #		endif
 
-	psout.Reflectance = float4(indirectLobeWeights.specular, psout.Diffuse.w);
+#		if defined(VR) && (defined(EMAT) || defined(TRUE_PBR)) && (defined(PARALLAX) || defined(LANDSCAPE) || defined(EMAT_ENVMAP) || defined(TRUE_PBR))
+	// VR: store POM parallax amount for stereo reprojection depth correction.
+	// Read by StereoBlendCS to adjust Eye 1 (right eye) reprojection depth
+	// at POM-displaced surfaces. Not consumed on flat (SE/AE).
+	psout.Reflectance = float4(indirectLobeWeights.specular,
+		(pixelOffset > 0.0) ? saturate(pixelOffset) : 0.0);
+#		else
+	psout.Reflectance = float4(indirectLobeWeights.specular, 0.0);
+#		endif
 	psout.NormalGlossiness = float4(GBuffer::EncodeNormal(screenSpaceNormal), saturate(1.0 - material.Roughness), psout.Diffuse.w);
 
 #		if defined(SNOW)

package/Shaders/RunGrass.hlsl

@@ -850,7 +850,6 @@ PS_OUTPUT main(PS_INPUT input)
 
 #		if defined(RENDER_DEPTH)
 	float diffuseAlpha = input.VertexColor.w * baseColor.w;
-
 	if ((diffuseAlpha - AlphaTestRefRS) < 0) {
 		discard;
 	}