protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
if (mask.Length == 0)
{
return new VFXExpression[] { }
}
;
var inputComponents = (inputExpression.Length > 0) ? VFXOperatorUtility.ExtractComponents(inputExpression[0]).ToArray() : new VFXExpression[0];
var componentStack = new Stack <VFXExpression>();
int outputSize = mask.Length;
for (int iComponent = 0; iComponent < outputSize; iComponent++)
{
char componentChar = char.ToLower(mask[iComponent]);
int currentComponent = Math.Min(CharToComponentIndex(componentChar), inputComponents.Length - 1);
componentStack.Push(inputComponents[currentComponent]);
}
VFXExpression finalExpression = null;
if (componentStack.Count == 1)
{
finalExpression = componentStack.Pop();
}
else
{
finalExpression = new VFXExpressionCombine(componentStack.Reverse().ToArray());
}
return(new[] { finalExpression });
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var components = VFXOperatorUtility.ExtractComponents(inputExpression[0]);
VFXExpression rgb = new VFXExpressionCombine(components.Take(3).ToArray());
return(new[] { new VFXExpressionRGBtoHSV(rgb) });
}
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 sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var location = new VFXExpressionCombine(
new VFXExpressionCastUintToFloat(inputExpression[1]),
new VFXExpressionCastUintToFloat(inputExpression[2]));
return(new[] { new VFXExpressionLoadCameraBuffer(inputExpression[0], location) });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var location = new VFXExpressionCombine(
new VFXExpressionCastUintToFloat(inputExpression[1]),
new VFXExpressionCastUintToFloat(inputExpression[2]),
new VFXExpressionCastUintToFloat(inputExpression[3]),
new VFXExpressionCastUintToFloat(inputExpression[4]));
return(new[] { new VFXExpressionLoadTexture2DArray(inputExpression[0], location) });
}
VFXExpression AngleFadeSimplification(VFXExpression angleFadeExp)
{
angleFadeExp = angleFadeExp / VFXValue.Constant(new Vector2(180.0f, 180.0f));
var angleStart = new VFXExpressionExtractComponent(angleFadeExp, 0);
var angleEnd = new VFXExpressionExtractComponent(angleFadeExp, 1);
var range = new VFXExpressionMax(VFXValue.Constant(0.0001f), angleEnd - angleStart);
var simplifiedAngleFade = new VFXExpressionCombine(
VFXValue.Constant(1.0f) - (VFXValue.Constant(0.25f) - angleStart) / range,
VFXValue.Constant(-0.25f) / range);
return(simplifiedAngleFade);
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression parameters = new VFXExpressionCombine(inputExpression[1], inputExpression[2], inputExpression[4]);
if (type == NoiseType.Curl)
{
if (curlDimensions == CurlDimensionCount.Two)
{
return(new[] { new VFXExpressionPerlinCurlNoise2D(inputExpression[0], parameters, inputExpression[3]) });
}
else
{
return(new[] { new VFXExpressionPerlinCurlNoise3D(inputExpression[0], parameters, inputExpression[3]) });
}
}
else
{
VFXExpression rangeMultiplier = (inputExpression[5].y - inputExpression[5].x);
if (dimensions == DimensionCount.One)
{
VFXExpression noise = new VFXExpressionPerlinNoise1D(inputExpression[0], parameters, inputExpression[3]);
VFXExpression x = VFXOperatorUtility.Fit(noise.x, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f), inputExpression[5].x, inputExpression[5].y);
VFXExpression y = noise.y * rangeMultiplier;
return(new[] { x, y });
}
else if (dimensions == DimensionCount.Two)
{
VFXExpression noise = new VFXExpressionPerlinNoise2D(inputExpression[0], parameters, inputExpression[3]);
VFXExpression x = VFXOperatorUtility.Fit(noise.x, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f), inputExpression[5].x, inputExpression[5].y);
VFXExpression y = noise.y * rangeMultiplier;
VFXExpression z = noise.z * rangeMultiplier;
return(new[] { x, new VFXExpressionCombine(y, z) });
}
else
{
VFXExpression noise = new VFXExpressionPerlinNoise3D(inputExpression[0], parameters, inputExpression[3]);
VFXExpression x = VFXOperatorUtility.Fit(noise.x, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f), inputExpression[5].x, inputExpression[5].y);
VFXExpression y = noise.y * rangeMultiplier;
VFXExpression z = noise.z * rangeMultiplier;
VFXExpression w = noise.w * rangeMultiplier;
return(new[] { x, new VFXExpressionCombine(y, z, w) });
}
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var mask = new Component[4] {
x, y, z, w
};
// var mask = new Component[4] { Component.X, Component.Y, Component.Z, Component.W };
int maskSize = 4;
while (maskSize > 1 && mask[maskSize - 1] == Component.None)
{
--maskSize;
}
var inputComponents = VFXOperatorUtility.ExtractComponents(inputExpression[0]).ToArray();
var componentStack = new Stack <VFXExpression>();
int outputSize = GetMaskSize(mask);
for (int iComponent = 0; iComponent < outputSize; iComponent++)
{
Component currentComponent = mask[iComponent];
if (currentComponent != Component.None && (int)currentComponent < inputComponents.Length)
{
componentStack.Push(inputComponents[(int)currentComponent]);
}
else
{
componentStack.Push(VFXValue <float> .Default);
}
}
VFXExpression finalExpression = null;
if (componentStack.Count == 1)
{
finalExpression = componentStack.Pop();
}
else
{
finalExpression = new VFXExpressionCombine(componentStack.Reverse().ToArray());
}
return(new[] { finalExpression });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression parameters = new VFXExpressionCombine(inputExpression[1], inputExpression[2], inputExpression[4]);
if (dimensions == DimensionCount.One)
{
return new[] { new VFXExpressionValueNoise1D(inputExpression[0], parameters, inputExpression[3]) }
}
;
else if (dimensions == DimensionCount.Two)
{
return new[] { new VFXExpressionValueNoise2D(inputExpression[0], parameters, inputExpression[3]) }
}
;
else
{
return new[] { new VFXExpressionValueNoise3D(inputExpression[0], parameters, inputExpression[3]) }
};
}
}
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) });
}
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 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);
// renormalize XY from viewport position [0, 1] to clip position [-1, 1]
VFXExpression viewportPosExpression = inputExpression[0];
VFXExpression oneExpression = VFXValue.Constant(1.0f);
VFXExpression twoExpression = VFXValue.Constant(2.0f);
VFXExpression clipPosExpression = new VFXExpressionCombine(viewportPosExpression.x * twoExpression - oneExpression, viewportPosExpression.y * twoExpression - oneExpression, oneExpression, oneExpression);
// result = clipPos * ClipToView * ViewToVFX
VFXExpression viewPosExpression = new VFXExpressionTransformVector4(matricesExpressions.ClipToView.exp, clipPosExpression);
viewPosExpression = new VFXExpressionCombine(viewPosExpression.x, viewPosExpression.y, viewPosExpression.z) * viewportPosExpression.zzz;
VFXExpression positionExpression = new VFXExpressionTransformPosition(matricesExpressions.ViewToVFX.exp, viewPosExpression);
return(new VFXExpression[]
{
positionExpression
});
}
private static IEnumerable <VFXNamedExpression> GetExpressionsImpl(
InitializeSolver initializeBlock,
SolverDataParameters solverDataParams,
IEnumerable <VFXNamedExpression> fluid,
VFXExpression h,
VFXExpression mass,
VFXExpression density,
VFXExpression gravity)
{
// Fluid
if (fluid == null || h == null || mass == null || density == null)
{
var defaultFluid = Fluid.defaultValue;
h = VFXValue.Constant(defaultFluid.SmoothingDistance);
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_ParticleMass))
{
yield return(new VFXNamedExpression(
GetParticleMass(
initializeBlock,
h,
VFXValue.Constant(defaultFluid.ParticleMass),
VFXValue.Constant(defaultFluid.Density)
), "solverData_Fluid_ParticleMass"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_Density))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.Density), "solverData_Fluid_Density"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_MinimumDensity))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.MinimumDensity), "solverData_Fluid_MinimumDensity"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_GasConstant))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.GasConstant), "solverData_Fluid_GasConstant"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_Viscosity))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.Viscosity), "solverData_Fluid_Viscosity"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_SurfaceTension))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.SurfaceTension), "solverData_Fluid_SurfaceTension"));
}
if (solverDataParams.HasFlag(SolverDataParameters.Fluid_BuoyancyCoefficient))
{
yield return(new VFXNamedExpression(
VFXValue.Constant(defaultFluid.BuoyancyCoefficient), "solverData_Fluid_BuoyancyCoefficient"));
}
}
else
{
foreach (var expression in fluid)
{
if (Enum.TryParse(expression.name, out SolverDataParameters solverDataParameter) &&
solverDataParams.HasFlag(solverDataParameter))
{
if (solverDataParameter == SolverDataParameters.Fluid_ParticleMass)
{
yield return(new VFXNamedExpression(
GetParticleMass(initializeBlock, h, mass, density), "solverData_Fluid_ParticleMass"));
continue;
}
yield return(new VFXNamedExpression(expression.exp, $"solverData_{expression.name}"));
}
}
;
}
// KernelSize: x - h, y - h^2, z - h^3, w - h / 2
if (solverDataParams.HasFlag(SolverDataParameters.KernelSize))
{
yield return(new VFXNamedExpression(new VFXExpressionCombine(new []
{
h,
h * h,
h * h * h,
h * VFXValue.Constant(0.5f),
}),
"solverData_KernelSize"));
}
// KernelFactors: x - poly6, y - spiky, z - viscosity
if (solverDataParams.HasFlag(SolverDataParameters.KernelFactors))
{
var poly6 = new Poly6Kernel(h);
var spiky = new SpikyKernel(h);
var viscosity = new ViscosityKernel(h);
yield return(new VFXNamedExpression(new VFXExpressionCombine(new []
{
poly6.GetFactor(), spiky.GetFactor(), viscosity.GetFactor()
}),
"solverData_KernelFactors"));
}
// Gravity
if (solverDataParams.HasFlag(SolverDataParameters.Gravity))
{
if (gravity == null)
{
gravity = new VFXExpressionCombine(new []
{
VFXValue.Constant(0.0f), VFXValue.Constant(-9.81f), VFXValue.Constant(0.0f),
});
}
yield return(new VFXNamedExpression(gravity, "solverData_Gravity"));
}
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression parameters = new VFXExpressionCombine(inputExpression[2], inputExpression[3], inputExpression[4]);
return(new[] { new VFXExpressionVoroNoise2D(inputExpression[0], parameters) * inputExpression[1] });
}
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[3], inputExpression[4]);
VFXExpression rangeMultiplier = (inputExpression[5].y - inputExpression[5].x);
VFXExpression result;
VFXExpression rangeMin = VFXValue.Constant(0.0f);
VFXExpression rangeMax = VFXValue.Constant(1.0f);
if (dimensions == DimensionCount.One)
{
if (type == NoiseType.Value)
{
result = new VFXExpressionValueNoise1D(inputExpression[0], parameters, inputExpression[2]);
}
else if (type == NoiseType.Perlin)
{
result = new VFXExpressionPerlinNoise1D(inputExpression[0], parameters, inputExpression[2]);
rangeMin = VFXValue.Constant(-1.0f);
}
else
{
result = new VFXExpressionCellularNoise1D(inputExpression[0], parameters, inputExpression[2]);
}
VFXExpression x = VFXOperatorUtility.Fit(result.x, rangeMin, rangeMax, inputExpression[5].x, inputExpression[5].y);
VFXExpression y = result.y * rangeMultiplier;
return(new[] { x, y });
}
else if (dimensions == DimensionCount.Two)
{
if (type == NoiseType.Value)
{
result = new VFXExpressionValueNoise2D(inputExpression[0], parameters, inputExpression[2]);
}
else if (type == NoiseType.Perlin)
{
result = new VFXExpressionPerlinNoise2D(inputExpression[0], parameters, inputExpression[2]);
rangeMin = VFXValue.Constant(-1.0f);
}
else
{
result = new VFXExpressionCellularNoise2D(inputExpression[0], parameters, inputExpression[2]);
}
VFXExpression x = VFXOperatorUtility.Fit(result.x, rangeMin, rangeMax, inputExpression[5].x, inputExpression[5].y);
VFXExpression y = result.y * rangeMultiplier;
VFXExpression z = result.z * rangeMultiplier;
return(new[] { x, new VFXExpressionCombine(y, z) });
}
else
{
if (type == NoiseType.Value)
{
result = new VFXExpressionValueNoise3D(inputExpression[0], parameters, inputExpression[2]);
}
else if (type == NoiseType.Perlin)
{
result = new VFXExpressionPerlinNoise3D(inputExpression[0], parameters, inputExpression[2]);
rangeMin = VFXValue.Constant(-1.0f);
}
else
{
result = new VFXExpressionCellularNoise3D(inputExpression[0], parameters, inputExpression[2]);
}
VFXExpression x = VFXOperatorUtility.Fit(result.x, rangeMin, rangeMax, inputExpression[5].x, inputExpression[5].y);
VFXExpression y = result.y * rangeMultiplier;
VFXExpression z = result.z * rangeMultiplier;
VFXExpression w = result.w * rangeMultiplier;
return(new[] { x, new VFXExpressionCombine(y, z, w) });
}
}
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());
}
