#if SHADERPASS != SHADERPASS_VELOCITY #error SHADERPASS_is_not_correctly_define #endif // Available semantic start from TEXCOORD4 struct AttributesPass { float3 previousPositionOS : TEXCOORD4; // Contain previous transform position (in case of skinning for example) }; struct VaryingsPassToPS { // Note: Z component is not use currently // This is the clip space position. Warning, do not confuse with the value of positionCS in PackedVarying which is SV_POSITION and store in positionSS float4 positionCS; float4 previousPositionCS; }; // Available interpolator start from TEXCOORD8 struct PackedVaryingsPassToPS { // Note: Z component is not use float3 interpolators0 : TEXCOORD8; float3 interpolators1 : TEXCOORD9; }; PackedVaryingsPassToPS PackVaryingsPassToPS(VaryingsPassToPS input) { PackedVaryingsPassToPS output; output.interpolators0 = float3(input.positionCS.xyw); output.interpolators1 = float3(input.previousPositionCS.xyw); return output; } VaryingsPassToPS UnpackVaryingsPassToPS(PackedVaryingsPassToPS input) { VaryingsPassToPS output; output.positionCS = float4(input.interpolators0.xy, 0.0, input.interpolators0.z); output.previousPositionCS = float4(input.interpolators1.xy, 0.0, input.interpolators1.z); return output; } #ifdef TESSELLATION_ON // Available interpolator start from TEXCOORD4 // Same as ToPS here #define VaryingsPassToDS VaryingsPassToPS #define PackedVaryingsPassToDS PackedVaryingsPassToPS #define PackVaryingsPassToDS PackVaryingsPassToPS #define UnpackVaryingsPassToDS UnpackVaryingsPassToPS VaryingsPassToDS InterpolateWithBaryCoordsPassToDS(VaryingsPassToDS input0, VaryingsPassToDS input1, VaryingsPassToDS input2, float3 baryCoords) { VaryingsPassToDS output; TESSELLATION_INTERPOLATE_BARY(positionCS, baryCoords); TESSELLATION_INTERPOLATE_BARY(previousPositionCS, baryCoords); return output; } #endif // TESSELLATION_ON #ifdef TESSELLATION_ON #define VaryingsPassType VaryingsPassToDS #else #define VaryingsPassType VaryingsPassToPS #endif // We will use custom attributes for this pass #define VARYINGS_NEED_PASS #include "VertMesh.hlsl" // Transforms normal from object to world space float3 TransformPreviousObjectToWorldNormal(float3 normalOS) { #ifdef UNITY_ASSUME_UNIFORM_SCALING return normalize(mul((float3x3)unity_MatrixPreviousM, normalOS)); #else // Normal need to be multiply by inverse transpose // mul(IT_M, norm) => mul(norm, I_M) => {dot(norm, I_M.col0), dot(norm, I_M.col1), dot(norm, I_M.col2)} return normalize(mul(normalOS, (float3x3)unity_MatrixPreviousMI)); #endif } void VelocityPositionZBias(VaryingsToPS input) { #if defined(UNITY_REVERSED_Z) input.vmesh.positionCS.z -= unity_MotionVectorsParams.z * input.vmesh.positionCS.w; #else input.vmesh.positionCS.z += unity_MotionVectorsParams.z * input.vmesh.positionCS.w; #endif } PackedVaryingsType Vert(AttributesMesh inputMesh, AttributesPass inputPass) { VaryingsType varyingsType; varyingsType.vmesh = VertMesh(inputMesh); #if !defined(TESSELLATION_ON) VelocityPositionZBias(varyingsType); #endif // It is not possible to correctly generate the motion vector for tesselated geometry as tessellation parameters can change // from one frame to another (adaptative, lod) + in Unity we only receive information for one non tesselated vertex. // So motion vetor will be based on interpolate previous position at vertex level instead. varyingsType.vpass.positionCS = mul(_NonJitteredViewProjMatrix, float4(varyingsType.vmesh.positionWS, 1.0)); // Note: unity_MotionVectorsParams.y is 0 is forceNoMotion is enabled bool forceNoMotion = unity_MotionVectorsParams.y == 0.0; if (forceNoMotion) { varyingsType.vpass.previousPositionCS = float4(0.0, 0.0, 0.0, 1.0); } else { bool hasDeformation = unity_MotionVectorsParams.x > 0.0; // Skin or morph target //Need to apply any vertex animation to the previous worldspace position, if we want it to show up in the velocity buffer float3 previousPositionWS = mul(unity_MatrixPreviousM, hasDeformation ? float4(inputPass.previousPositionOS, 1.0) : float4(inputMesh.positionOS, 1.0)).xyz; #ifdef ATTRIBUTES_NEED_NORMAL float3 normalWS = TransformPreviousObjectToWorldNormal(inputMesh.normalOS); #else float3 normalWS = float3(0.0, 0.0, 0.0); #endif #if defined(HAVE_VERTEX_MODIFICATION) ApplyVertexModification(inputMesh, normalWS, previousPositionWS, _PreviousTime); #endif //Need this since we are using the current position from VertMesh() previousPositionWS = GetCameraRelativePositionWS(previousPositionWS); varyingsType.vpass.previousPositionCS = mul(_PrevViewProjMatrix, float4(previousPositionWS, 1.0)); } return PackVaryingsType(varyingsType); } #ifdef TESSELLATION_ON PackedVaryingsToPS VertTesselation(VaryingsToDS input) { VaryingsToPS output; output.vmesh = VertMeshTesselation(input.vmesh); VelocityPositionZBias(output); output.vpass.positionCS = input.vpass.positionCS; output.vpass.previousPositionCS = input.vpass.previousPositionCS; return PackVaryingsToPS(output); } #include "TessellationShare.hlsl" #endif // TESSELLATION_ON void Frag( PackedVaryingsToPS packedInput, out float4 outColor : SV_Target0 #ifdef _DEPTHOFFSET_ON , out float outputDepth : SV_Depth #endif ) { FragInputs input = UnpackVaryingsMeshToFragInputs(packedInput.vmesh); // input.positionSS is SV_Position PositionInputs posInput = GetPositionInput(input.positionSS.xy, _ScreenSize.zw, input.positionSS.z, input.positionSS.w, input.positionWS); #ifdef VARYINGS_NEED_POSITION_WS float3 V = GetWorldSpaceNormalizeViewDir(input.positionWS); #else float3 V = 0; // Avoid the division by 0 #endif // Perform alpha testing + get velocity SurfaceData surfaceData; BuiltinData builtinData; GetSurfaceAndBuiltinData(input, V, posInput, surfaceData, builtinData); VaryingsPassToPS inputPass = UnpackVaryingsPassToPS(packedInput.vpass); #ifdef _DEPTHOFFSET_ON inputPass.positionCS.w += builtinData.depthOffset; inputPass.previousPositionCS.w += builtinData.depthOffset; #endif // TODO: How to allow overriden velocity vector from GetSurfaceAndBuiltinData ? float2 velocity = CalculateVelocity(inputPass.positionCS, inputPass.previousPositionCS); EncodeVelocity(velocity, outColor); // Note: unity_MotionVectorsParams.y is 0 is forceNoMotion is enabled bool forceNoMotion = unity_MotionVectorsParams.y == 0.0; if (forceNoMotion) outColor = float4(0.0, 0.0, 0.0, 0.0); #ifdef _DEPTHOFFSET_ON outputDepth = posInput.deviceDepth; #endif }