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 VFXExpression[] ChainedBranchResult(VFXExpression[] compare, VFXExpression[] expressions, int[] valueStartIndex)
{
var expressionCountPerUniqueSlot = this.expressionCountPerUniqueSlot;
var branchResult = new VFXExpression[expressionCountPerUniqueSlot];
for (int subExpression = 0; subExpression < expressionCountPerUniqueSlot; ++subExpression)
{
var branch = new VFXExpression[valueStartIndex.Length];
branch[valueStartIndex.Length - 1] = expressions[valueStartIndex.Last() + subExpression]; //Last entry always is a fallback
for (int i = valueStartIndex.Length - 2; i >= 0; i--)
{
branch[i] = new VFXExpressionBranch(compare[i], expressions[valueStartIndex[i] + subExpression], branch[i + 1]);
}
branchResult[subExpression] = branch[0];
}
return(branchResult);
}
public void ProcessExpressionBranch()
{
var branch0 = VFXValue.Constant(Vector3.right);
var branch1 = VFXValue.Constant(Vector3.up);
var test0 = new VFXExpressionBranch(VFXValue.Constant(true), branch0, branch1);
var test1 = new VFXExpressionBranch(VFXValue.Constant(false), branch0, branch1);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultA = context.Compile(test0);
var resultB = context.Compile(test1);
Assert.AreEqual(Vector3.right, resultA.Get <Vector3>());
Assert.AreEqual(Vector3.up, resultB.Get <Vector3>());
// Test static branching
context = new VFXExpression.Context(VFXExpressionContextOption.Reduction);
var resultC = context.Compile(test0);
Assert.AreEqual(branch0, resultC);
}
public static CameraMatricesExpressions GetMatricesExpressions(IEnumerable <VFXNamedExpression> expressions, VFXCoordinateSpace cameraSpace, VFXCoordinateSpace outputSpace)
{
var fov = expressions.First(e => e.name == "Camera_fieldOfView");
var aspect = expressions.First(e => e.name == "Camera_aspectRatio");
var near = expressions.First(e => e.name == "Camera_nearPlane");
var far = expressions.First(e => e.name == "Camera_farPlane");
var cameraMatrix = expressions.First(e => e.name == "Camera_transform");
var isOrtho = expressions.First(e => e.name == "Camera_orthographic");
var orthoSize = expressions.First(e => e.name == "Camera_orthographicSize");
var lensShift = expressions.First(e => e.name == "Camera_lensShift");
VFXExpression ViewToVFX = cameraMatrix.exp;
if (cameraSpace == VFXCoordinateSpace.World && outputSpace == VFXCoordinateSpace.Local)
{
ViewToVFX = new VFXExpressionTransformMatrix(VFXBuiltInExpression.WorldToLocal, cameraMatrix.exp);
}
else if (cameraSpace == VFXCoordinateSpace.Local && outputSpace == VFXCoordinateSpace.World)
{
ViewToVFX = new VFXExpressionTransformMatrix(VFXBuiltInExpression.LocalToWorld, cameraMatrix.exp);
}
VFXExpression VFXToView = new VFXExpressionInverseTRSMatrix(ViewToVFX);
VFXExpression ViewToClip = new VFXExpressionBranch(isOrtho.exp,
VFXOperatorUtility.GetOrthographicMatrix(orthoSize.exp, aspect.exp, near.exp, far.exp),
VFXOperatorUtility.GetPerspectiveMatrix(fov.exp, aspect.exp, near.exp, far.exp, lensShift.exp));
VFXExpression ClipToView = new VFXExpressionInverseMatrix(ViewToClip);
return(new CameraMatricesExpressions()
{
ViewToVFX = new VFXNamedExpression(ViewToVFX, "ViewToVFX"),
VFXToView = new VFXNamedExpression(VFXToView, "VFXToView"),
ViewToClip = new VFXNamedExpression(ViewToClip, "ViewToClip"),
ClipToView = new VFXNamedExpression(ClipToView, "ClipToView"),
});
}
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);
}
}
