public static IEnumerable <VFXExpression> SampleEdgeAttribute(VFXExpression source, VFXExpression index, VFXExpression lerp, IEnumerable <VertexAttribute> vertexAttributes)
{
bool skinnedMesh = source.valueType == UnityEngine.VFX.VFXValueType.SkinnedMeshRenderer;
var mesh = !skinnedMesh ? source : new VFXExpressionMeshFromSkinnedMeshRenderer(source);
var meshIndexFormat = new VFXExpressionMeshIndexFormat(mesh);
var oneInt = VFXOperatorUtility.OneExpression[UnityEngine.VFX.VFXValueType.Int32];
var oneUint = VFXOperatorUtility.OneExpression[UnityEngine.VFX.VFXValueType.Uint32];
var threeUint = VFXOperatorUtility.ThreeExpression[UnityEngine.VFX.VFXValueType.Uint32];
var nextIndex = index + oneUint;
//Loop triangle
var loop = VFXOperatorUtility.Modulo(nextIndex, threeUint);
var predicat = new VFXExpressionCondition(UnityEngine.VFX.VFXValueType.Uint32, VFXCondition.NotEqual, loop, VFXOperatorUtility.ZeroExpression[UnityEngine.VFX.VFXValueType.Uint32]);
nextIndex = new VFXExpressionBranch(predicat, nextIndex, nextIndex - threeUint);
var sampledIndex_A = new VFXExpressionSampleIndex(mesh, index, meshIndexFormat);
var sampledIndex_B = new VFXExpressionSampleIndex(mesh, nextIndex, meshIndexFormat);
var sampling_A = SampleVertexAttribute(source, sampledIndex_A, vertexAttributes).ToArray();
var sampling_B = SampleVertexAttribute(source, sampledIndex_B, vertexAttributes).ToArray();
for (int i = 0; i < vertexAttributes.Count(); ++i)
{
var outputValueType = sampling_A[i].valueType;
var s = VFXOperatorUtility.CastFloat(lerp, outputValueType);
yield return(VFXOperatorUtility.Lerp(sampling_A[i], sampling_B[i], s));
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var t = inputExpression[0];
var posA = inputExpression[1];
var posB = inputExpression[2];
var posC = inputExpression[3];
var posD = inputExpression[4];
var vt = VFXOperatorUtility.CastFloat(t, VFXValueType.Float3);
var vtc = VFXOperatorUtility.CastFloat(VFXOperatorUtility.OneExpression[VFXValueType.Float] - t, VFXValueType.Float3);
var three = VFXOperatorUtility.CastFloat(VFXValue.Constant(3.0f), VFXValueType.Float3);
var six = VFXOperatorUtility.CastFloat(VFXValue.Constant(6.0f), VFXValueType.Float3);
// Position
var A = posA * vtc * vtc * vtc;
var B = three * posB * vtc * vtc * vt;
var C = three * posC * vtc * vt * vt;
var D = posD * vt * vt * vt;
// Derivative
var dA = three * vtc * vtc * (posB - posA);
var dB = six * vtc * vt * (posC - posB);
var dC = three * vt * vt * (posD - posC);
return(new[] { A + B + C + D, dA + dB + dC });
}
public void ProcessExpressionBasic()
{
//Reference some float math operation
var a = new Vector2(0.75f, 0.5f);
var b = new Vector3(1.3f, 0.2f, 0.7f);
var c = 0.8f;
var d = 0.1f;
var refResultA = new Vector3(a.x + b.x, a.y + b.y, b.z);
var refResultB = new Vector3(Mathf.Sin(refResultA.x), Mathf.Sin(refResultA.y), Mathf.Sin(refResultA.z));
var refResultC = refResultB * c;
var refResultD = new Vector3(d, d, d) - refResultC;
//Using expression system
var value_a = new VFXValue <Vector2>(a);
var value_b = new VFXValue <Vector3>(b);
var value_c = new VFXValue <float>(c);
var value_d = new VFXValue <float>(d);
var addExpression = VFXOperatorUtility.CastFloat(value_a, value_b.valueType) + value_b;
var sinExpression = new VFXExpressionSin(addExpression);
var mulExpression = (sinExpression * VFXOperatorUtility.CastFloat(value_c, sinExpression.valueType));
var subtractExpression = VFXOperatorUtility.CastFloat(value_d, mulExpression.valueType) - mulExpression;
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultA = context.Compile(addExpression);
var resultB = context.Compile(sinExpression);
var resultC = context.Compile(mulExpression);
var resultD = context.Compile(subtractExpression);
Assert.AreEqual(refResultA, resultA.Get <Vector3>());
Assert.AreEqual(refResultB, resultB.Get <Vector3>());
Assert.AreEqual(refResultC, resultC.Get <Vector3>());
Assert.AreEqual(refResultD, resultD.Get <Vector3>());
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression planeDistance = VFXOperatorUtility.SignedDistanceToPlane(inputExpression[0], inputExpression[1], inputExpression[2]);
VFXExpression pointOnPlane = (inputExpression[2] - inputExpression[1] * VFXOperatorUtility.CastFloat(planeDistance, inputExpression[1].valueType));
return(new VFXExpression[] { pointOnPlane, planeDistance });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression sphereDelta = (inputExpression[2] - inputExpression[0]);
VFXExpression sphereDeltaLength = VFXOperatorUtility.Length(sphereDelta);
VFXExpression sphereDistance = (sphereDeltaLength - inputExpression[1]);
VFXExpression pointOnSphere = (inputExpression[1] / sphereDeltaLength);
pointOnSphere = (sphereDelta * VFXOperatorUtility.CastFloat(pointOnSphere, inputExpression[0].valueType) + inputExpression[0]);
return(new VFXExpression[] { pointOnSphere, sphereDistance });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression lineDelta = (inputExpression[1] - inputExpression[0]);
VFXExpression lineLength = new VFXExpressionMax(VFXOperatorUtility.Dot(lineDelta, lineDelta), VFXValue.Constant(Mathf.Epsilon));
VFXExpression t = VFXOperatorUtility.Dot(inputExpression[2] - inputExpression[0], lineDelta);
t = VFXOperatorUtility.Clamp(t / lineLength, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f));
VFXExpression pointOnLine = (inputExpression[0] + VFXOperatorUtility.CastFloat(t, lineDelta.valueType) * lineDelta);
VFXExpression lineDistance = VFXOperatorUtility.Distance(inputExpression[2], pointOnLine);
return(new VFXExpression[] { pointOnLine, lineDistance });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var pos = inputExpression[0];
var center = inputExpression[1];
var wAxis = inputExpression[2];
var angle = inputExpression[3];
var projPoint = center + (wAxis * VFXOperatorUtility.CastFloat(VFXOperatorUtility.Dot(wAxis, pos - center), VFXValueType.Float3));
var uAxis = pos - projPoint;
var vAxis = VFXOperatorUtility.Cross(uAxis, wAxis);
var sinAngle = VFXOperatorUtility.CastFloat(new VFXExpressionSin(angle), VFXValueType.Float3);
var cosAngle = VFXOperatorUtility.CastFloat(new VFXExpressionCos(angle), VFXValueType.Float3);
return(new[] { projPoint + (uAxis * cosAngle) + (vAxis * sinAngle) });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression parameters = new VFXExpressionCombine(inputExpression[1], inputExpression[3], inputExpression[4]);
VFXExpression result;
if (dimensions == DimensionCount.Two)
{
if (type == NoiseType.Value)
{
result = new VFXExpressionValueCurlNoise2D(inputExpression[0], parameters, inputExpression[2]);
}
else if (type == NoiseType.Perlin)
{
result = new VFXExpressionPerlinCurlNoise2D(inputExpression[0], parameters, inputExpression[2]);
}
else
{
result = new VFXExpressionCellularCurlNoise2D(inputExpression[0], parameters, inputExpression[2]);
}
}
else
{
if (type == NoiseType.Value)
{
result = new VFXExpressionValueCurlNoise3D(inputExpression[0], parameters, inputExpression[2]);
}
else if (type == NoiseType.Perlin)
{
result = new VFXExpressionPerlinCurlNoise3D(inputExpression[0], parameters, inputExpression[2]);
}
else
{
result = new VFXExpressionCellularCurlNoise3D(inputExpression[0], parameters, inputExpression[2]);
}
}
return(new[] { result *VFXOperatorUtility.CastFloat(inputExpression[5], result.valueType) });
}
public void ProcessOperatorLerp()
{
var a = new Vector3(0.2f, 0.3f, 0.4f);
var b = new Vector3(1.0f, 2.3f, 5.4f);
var c = 0.2f;
var d = 1.5f;
var resultA = Vector3.LerpUnclamped(a, b, c);
var resultB = Vector3.LerpUnclamped(a, b, d);
var value_a = new VFXValue <Vector3>(a);
var value_b = new VFXValue <Vector3>(b);
var value_c = new VFXValue <float>(c);
var value_d = new VFXValue <float>(d);
var expressionA = VFXOperatorUtility.Lerp(value_a, value_b, VFXOperatorUtility.CastFloat(value_c, value_b.valueType));
var expressionB = VFXOperatorUtility.Lerp(value_a, value_b, VFXOperatorUtility.CastFloat(value_d, value_b.valueType));
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultExpressionA = context.Compile(expressionA);
var resultExpressionB = context.Compile(expressionB);
Assert.AreEqual((resultA - resultExpressionA.Get <Vector3>()).magnitude, 0.0f, 0.001f);
Assert.AreEqual((resultB - resultExpressionB.Get <Vector3>()).magnitude, 0.0f, 0.001f);
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var expressions = Block.CameraHelper.AddCameraExpressions(GetExpressionsFromSlots(this), camera);
// camera matrix is already in world even in custom mode due to GetOutputSpaceFromSlot returning world space
Block.CameraMatricesExpressions matricesExpressions = Block.CameraHelper.GetMatricesExpressions(expressions, VFXCoordinateSpace.World, VFXCoordinateSpace.World);
// result = position * VFXToView * ViewToClip
VFXExpression positionExpression = inputExpression[0];
VFXExpression viewPosExpression = new VFXExpressionTransformPosition(matricesExpressions.VFXToView.exp, positionExpression);
VFXExpression clipPosExpression = new VFXExpressionTransformVector4(matricesExpressions.ViewToClip.exp, VFXOperatorUtility.CastFloat(viewPosExpression, VFXValueType.Float4, 1.0f));
// normalize using w component and renormalize to range [0, 1]
VFXExpression halfExpression = VFXValue.Constant(0.5f);
VFXExpression normalizedExpression = new VFXExpressionCombine(new VFXExpression[]
{
(clipPosExpression.x / clipPosExpression.w) * halfExpression + halfExpression,
(clipPosExpression.y / clipPosExpression.w) * halfExpression + halfExpression,
viewPosExpression.z // The z position is in world units from the camera
});
return(new VFXExpression[]
{
normalizedExpression
});
}
protected override VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
// Offset to compensate for the numerous custom camera generated expressions
_customCameraOffset = 0;
// Get the extra number of expressions if a custom camera input is used
if (camera == CameraMode.Custom)
{
_customCameraOffset = GetInputSlot(0).children.Count() - 1;
}
// List to gather all output expressions as their number can vary
List <VFXExpression> outputs = new List <VFXExpression>();
// Camera expressions
var expressions = Block.CameraHelper.AddCameraExpressions(GetExpressionsFromSlots(this), camera);
Block.CameraMatricesExpressions camMatrices = Block.CameraHelper.GetMatricesExpressions(expressions);
var Camera_depthBuffer = expressions.First(e => e.name == "Camera_depthBuffer").exp;
var CamPixDim = expressions.First(e => e.name == "Camera_pixelDimensions").exp;
// Set uvs
VFXExpression uv = VFXValue.Constant <Vector2>();
// Determine how the particles are spawned on the screen
switch (mode)
{
case PositionMode.Random:
// Random UVs
uv = new VFXExpressionCombine(VFXOperatorUtility.FixedRandom(0, VFXSeedMode.PerParticle), VFXOperatorUtility.FixedRandom(1, VFXSeedMode.PerParticle));
break;
case PositionMode.Sequential:
// Pixel perfect spawn
VFXExpression gridStep = inputExpression[inputSlots.IndexOf(inputSlots.First(o => o.name == "GridStep")) + _customCameraOffset];
VFXExpression sSizeX = new VFXExpressionCastFloatToUint(CamPixDim.x / new VFXExpressionCastUintToFloat(gridStep));
VFXExpression sSizeY = new VFXExpressionCastFloatToUint(CamPixDim.y / new VFXExpressionCastUintToFloat(gridStep));
VFXExpression nbPixels = sSizeX * sSizeY;
VFXExpression particleID = new VFXAttributeExpression(VFXAttribute.ParticleId);
VFXExpression id = VFXOperatorUtility.Modulo(particleID, nbPixels);
VFXExpression shift = new VFXExpressionBitwiseRightShift(gridStep, VFXValue.Constant <uint>(1));
VFXExpression U = VFXOperatorUtility.Modulo(id, sSizeX) * gridStep + shift;
VFXExpression V = id / sSizeX * gridStep + shift;
VFXExpression ids = new VFXExpressionCombine(new VFXExpressionCastUintToFloat(U), new VFXExpressionCastUintToFloat(V));
uv = new VFXExpressionDivide(ids + VFXOperatorUtility.CastFloat(VFXValue.Constant(0.5f), VFXValueType.Float2), CamPixDim);
break;
case PositionMode.Custom:
// Custom UVs
uv = inputExpression[inputSlots.IndexOf(inputSlots.FirstOrDefault(o => o.name == "UVSpawn")) + _customCameraOffset];
break;
}
VFXExpression projpos = uv * VFXValue.Constant <Vector2>(new Vector2(2f, 2f)) - VFXValue.Constant <Vector2>(Vector2.one);
VFXExpression uvs = new VFXExpressionCombine(uv.x * CamPixDim.x, uv.y * CamPixDim.y, VFXValue.Constant(0f), VFXValue.Constant(0f));
// Get depth
VFXExpression depth = new VFXExpressionExtractComponent(new VFXExpressionLoadTexture2DArray(Camera_depthBuffer, uvs), 0);
if (SystemInfo.usesReversedZBuffer)
{
depth = VFXOperatorUtility.OneExpression[depth.valueType] - depth;
}
VFXExpression isAlive = VFXValue.Constant(true);
// Determine how the particles are culled
switch (cullMode)
{
case CullMode.None:
// do nothing
break;
case CullMode.Range:
VFXExpression depthRange = inputExpression[inputSlots.IndexOf(inputSlots.LastOrDefault(o => o.name == "DepthRange")) + _customCameraOffset];
VFXExpression nearRangeCheck = new VFXExpressionCondition(VFXCondition.Less, depth, depthRange.x);
VFXExpression farRangeCheck = new VFXExpressionCondition(VFXCondition.Greater, depth, depthRange.y);
VFXExpression logicOr = new VFXExpressionLogicalOr(nearRangeCheck, farRangeCheck);
isAlive = new VFXExpressionBranch(logicOr, VFXValue.Constant(false), VFXValue.Constant(true));
break;
case CullMode.FarPlane:
VFXExpression farPlaneCheck = new VFXExpressionCondition(VFXCondition.GreaterOrEqual, depth, VFXValue.Constant(1f) - VFXValue.Constant(Mathf.Epsilon));
isAlive = new VFXExpressionBranch(farPlaneCheck, VFXValue.Constant(false), VFXValue.Constant(true));
break;
}
VFXExpression zMultiplier = inputExpression[inputSlots.IndexOf(inputSlots.First(o => o.name == "ZMultiplier")) + _customCameraOffset];
VFXExpression clipPos = new VFXExpressionCombine(projpos.x, projpos.y,
depth * zMultiplier * VFXValue.Constant(2f) - VFXValue.Constant(1f),
VFXValue.Constant(1f)
);
VFXExpression clipToVFX = new VFXExpressionTransformMatrix(camMatrices.ViewToVFX.exp, camMatrices.ClipToView.exp);
VFXExpression vfxPos = new VFXExpressionTransformVector4(clipToVFX, clipPos);
VFXExpression position = new VFXExpressionCombine(vfxPos.x, vfxPos.y, vfxPos.z) / VFXOperatorUtility.CastFloat(vfxPos.w, VFXValueType.Float3);
VFXExpression color = VFXValue.Constant <Vector4>();
// Assigning the color output to the corresponding color buffer value
if (inheritSceneColor)
{
VFXExpression Camera_colorBuffer = expressions.First(e => e.name == "Camera_colorBuffer").exp;
VFXExpression tempColor = new VFXExpressionLoadTexture2DArray(Camera_colorBuffer, uvs);
color = new VFXExpressionCombine(tempColor.x, tempColor.y, tempColor.z, VFXValue.Constant(1.0f));
}
// Add expressions in the right output order
outputs.Add(position);
if (inheritSceneColor)
{
outputs.Add(color);
}
if (cullMode != CullMode.None)
{
outputs.Add(isAlive);
}
return(outputs.ToArray());
}
public static IEnumerable <VFXExpression> SampleTriangleAttribute(VFXExpression source, VFXExpression triangleIndex, VFXExpression coord, SurfaceCoordinates coordMode, IEnumerable <VertexAttribute> vertexAttributes)
{
bool skinnedMesh = source.valueType == UnityEngine.VFX.VFXValueType.SkinnedMeshRenderer;
var mesh = !skinnedMesh ? source : new VFXExpressionMeshFromSkinnedMeshRenderer(source);
var meshIndexCount = new VFXExpressionMeshIndexCount(mesh);
var meshIndexFormat = new VFXExpressionMeshIndexFormat(mesh);
var threeUint = VFXOperatorUtility.ThreeExpression[UnityEngine.VFX.VFXValueType.Uint32];
var baseIndex = triangleIndex * threeUint;
var sampledIndex_A = new VFXExpressionSampleIndex(mesh, baseIndex, meshIndexFormat);
var sampledIndex_B = new VFXExpressionSampleIndex(mesh, baseIndex + VFXValue.Constant <uint>(1u), meshIndexFormat);
var sampledIndex_C = new VFXExpressionSampleIndex(mesh, baseIndex + VFXValue.Constant <uint>(2u), meshIndexFormat);
var allInputValues = new List <VFXExpression>();
var sampling_A = SampleVertexAttribute(source, sampledIndex_A, vertexAttributes).ToArray();
var sampling_B = SampleVertexAttribute(source, sampledIndex_B, vertexAttributes).ToArray();
var sampling_C = SampleVertexAttribute(source, sampledIndex_C, vertexAttributes).ToArray();
VFXExpression barycentricCoordinates = null;
var one = VFXOperatorUtility.OneExpression[UnityEngine.VFX.VFXValueType.Float];
if (coordMode == SurfaceCoordinates.Barycentric)
{
var barycentricCoordinateInput = coord;
barycentricCoordinates = new VFXExpressionCombine(barycentricCoordinateInput.x, barycentricCoordinateInput.y, one - barycentricCoordinateInput.x - barycentricCoordinateInput.y);
}
else if (coordMode == SurfaceCoordinates.Uniform)
{
//https://hal.archives-ouvertes.fr/hal-02073696v2/document
var input = coord;
var half2 = VFXOperatorUtility.HalfExpression[UnityEngine.VFX.VFXValueType.Float2];
var zero = VFXOperatorUtility.ZeroExpression[UnityEngine.VFX.VFXValueType.Float];
var t = input * half2;
var offset = t.y - t.x;
var pred = new VFXExpressionCondition(UnityEngine.VFX.VFXValueType.Float, VFXCondition.Greater, offset, zero);
var t2 = new VFXExpressionBranch(pred, t.y + offset, t.y);
var t1 = new VFXExpressionBranch(pred, t.x, t.x - offset);
var t3 = one - t2 - t1;
barycentricCoordinates = new VFXExpressionCombine(t1, t2, t3);
/* Possible variant See http://inis.jinr.ru/sl/vol1/CMC/Graphics_Gems_1,ed_A.Glassner.pdf (p24) uniform distribution from two numbers in triangle generating barycentric coordinate
* var input = VFXOperatorUtility.Saturate(inputExpression[2]);
* var s = input.x;
* var t = VFXOperatorUtility.Sqrt(input.y);
* var a = one - t;
* var b = (one - s) * t;
* var c = s * t;
* barycentricCoordinates = new VFXExpressionCombine(a, b, c);
*/
}
else
{
throw new InvalidOperationException("No supported surfaceCoordinates : " + coord);
}
for (int i = 0; i < vertexAttributes.Count(); ++i)
{
var outputValueType = sampling_A[i].valueType;
var barycentricCoordinateX = VFXOperatorUtility.CastFloat(barycentricCoordinates.x, outputValueType);
var barycentricCoordinateY = VFXOperatorUtility.CastFloat(barycentricCoordinates.y, outputValueType);
var barycentricCoordinateZ = VFXOperatorUtility.CastFloat(barycentricCoordinates.z, outputValueType);
var r = sampling_A[i] * barycentricCoordinateX + sampling_B[i] * barycentricCoordinateY + sampling_C[i] * barycentricCoordinateZ;
yield return(r);
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression parameters = new VFXExpressionCombine(inputExpression[1], inputExpression[2], inputExpression[4]);
if (dimensions == DimensionCount.One)
{
VFXExpression noise = new VFXExpressionPerlinNoise1D(inputExpression[0], parameters, inputExpression[3]);
noise = VFXOperatorUtility.Fit(noise, VFXValue.Constant(new Vector2(-1.0f, -1.0f)), VFXValue.Constant(Vector2.one), VFXOperatorUtility.CastFloat(inputExpression[5].x, noise.valueType), VFXOperatorUtility.CastFloat(inputExpression[5].y, noise.valueType));
return(new[] { noise.x, noise.y });
}
else if (dimensions == DimensionCount.Two)
{
VFXExpression noise = new VFXExpressionPerlinNoise2D(inputExpression[0], parameters, inputExpression[3]);
noise = VFXOperatorUtility.Fit(noise, VFXValue.Constant(new Vector3(-1.0f, -1.0f, -1.0f)), VFXValue.Constant(Vector3.one), VFXOperatorUtility.CastFloat(inputExpression[5].x, noise.valueType), VFXOperatorUtility.CastFloat(inputExpression[5].y, noise.valueType));
return(new[] { noise.x, new VFXExpressionCombine(noise.y, noise.z) });
}
else
{
VFXExpression noise = new VFXExpressionPerlinNoise3D(inputExpression[0], parameters, inputExpression[3]);
noise = VFXOperatorUtility.Fit(noise, VFXValue.Constant(new Vector4(-1.0f, -1.0f, -1.0f, -1.0f)), VFXValue.Constant(Vector4.one), VFXOperatorUtility.CastFloat(inputExpression[5].x, noise.valueType), VFXOperatorUtility.CastFloat(inputExpression[5].y, noise.valueType));
return(new[] { noise.x, new VFXExpressionCombine(noise.y, noise.z, noise.w) });
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var t = new VFXExpressionSharedRandom(inputExpression[1] * VFXValue.Constant(2u) + VFXValue.Constant(1u)) * VFXValue.Constant(Mathf.PI * 2);
var z = new VFXExpressionSharedRandom(inputExpression[1] * VFXValue.Constant(2u)) * VFXValue.Constant(2.0f) - VFXValue.Constant(1.0f);
var w = VFXOperatorUtility.Sqrt(VFXValue.Constant(1.0f) - z * z);
return(new[] { new VFXExpressionCombine(new VFXExpressionCos(t) * w, new VFXExpressionSin(t) * w, z) * VFXOperatorUtility.CastFloat(inputExpression[0], VFXValueType.Float3) });
}
