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#if SHADERPASS != SHADERPASS_VELOCITY
#error SHADERPASS_is_not_correctly_define
#endif
// Available semantic start from TEXCOORD4
struct AttributesPass
{
float3 previousPositionOS : NORMAL; // Contain previous transform position (in case of skinning for example)
// TODO: Caution - For now the tesselation doesn't displace along the normal with Velocity shader as the previous previous position
// conflict with the normal in the semantic. This need to be fix!
};
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 ouput;
TESSELLATION_INTERPOLATE_BARY(positionCS, baryCoords);
TESSELLATION_INTERPOLATE_BARY(previousPositionCS, baryCoords);
return ouput;
}
#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"
PackedVaryingsType Vert(AttributesMesh inputMesh,
AttributesPass inputPass)
{
VaryingsType varyingsType;
varyingsType.vmesh = VertMesh(inputMesh);
// 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, mul(unity_ObjectToWorld, float4(inputMesh.positionOS, 1.0)));
varyingsType.vpass.previousPositionCS = mul(_PrevViewProjMatrix, mul(unity_MatrixPreviousM, unity_MotionVectorsParams.x ? float4(inputPass.previousPositionOS, 1.0) : float4(inputMesh.positionOS, 1.0)));
return PackVaryingsType(varyingsType);
}
#ifdef TESSELLATION_ON
PackedVaryingsToPS VertTesselation(VaryingsToDS input)
{
VaryingsToPS output;
output.vmesh = VertMeshTesselation(input.vmesh);
output.vpass.positionCS = input.vpass.positionCS;
output.vpass.previousPositionCS = input.vpass.previousPositionCS;
return PackVaryingsToPS(output);
}
#include "TessellationShare.hlsl"
#endif // TESSELLATION_ON
float4 Frag(PackedVaryingsToPS packedInput) : SV_Target
{
FragInputs input = UnpackVaryingsMeshToFragInputs(packedInput.vmesh);
// input.positionSS is SV_Position
PositionInputs posInput = GetPositionInput(input.positionSS.xy, _ScreenSize.zw);
UpdatePositionInput(input.positionSS.z, input.positionSS.w, input.positionWS, posInput);
#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);
float4 outBuffer;
EncodeVelocity(velocity, outBuffer);
return outBuffer;
}