internal RibbonMesh(RibbonMeshCreateParams createParams)
{
_vertexStride = 0;
_faceCount = 0;
_vertices = null;
_indices = null;
_vertexBuffer = null;
_indexBuffer = null;
if (createParams.RibbonParameters == null)
{
return;
}
if (createParams.NotePairs == null)
{
return;
}
if (createParams.RibbonParameters.Length == 0 || createParams.NotePairs.Length == 0 || createParams.RibbonParameters.Length != createParams.NotePairs.Length)
{
throw new ArgumentException();
}
if (!createParams.RibbonParameters.Any(rp => rp.Visible))
{
throw new ArgumentException();
}
Dispose();
var vertexCount = 0;
var indexCount = 0;
var now = createParams.Now;
var slice = createParams.Slice;
var visualNoteMetrics = createParams.VisualNoteMetrics;
var animationMetrics = createParams.AnimationMetrics;
// First, calculate the total ribbon length.
// Since CGSS allows ribbon to "fold", we cannot simply use Y coord value to calculate texture V value.
var bezierCount = createParams.RibbonParameters.Count(rp => rp.Visible && !rp.IsLine);
var ribbonCache = bezierCount > 0 ? new RibbonPointCache[bezierCount] : null;
var ribbonLength = 0f;
var bezierIndex = 0;
for (var i = 0; i < createParams.RibbonParameters.Length; ++i)
{
var rp = createParams.RibbonParameters[i];
if (!rp.Visible)
{
continue;
}
var notePair = createParams.NotePairs[i];
if (rp.IsLine)
{
ribbonLength += Math.Abs(rp.Y1 - rp.Y2);
}
else
{
float startTime, endTime;
var startStatus = NoteAnimationHelper.GetOnStageStatusOf(notePair.Start, now, animationMetrics);
if (startStatus == OnStageStatus.Passed)
{
startTime = now;
}
else
{
startTime = notePair.Start.HitTime;
}
var endStatus = NoteAnimationHelper.GetOnStageStatusOf(notePair.End, now, animationMetrics);
if (endStatus == OnStageStatus.Incoming)
{
var endTimePoints = NoteAnimationHelper.CalculateNoteTimePoints(notePair.End, animationMetrics);
endTime = now + endTimePoints.Duration;
}
else
{
endTime = notePair.End.HitTime;
}
var pts = new Vector2[slice + 1];
for (var j = 0; j <= slice; ++j)
{
var t = (float)j / slice;
var pt = RibbonMathHelper.CubicBezier(rp, t);
pts[j] = pt;
if (j > 0)
{
ribbonLength += Math.Abs(pt.Y - pts[j - 1].Y);
}
}
var pointCache = new RibbonPointCache {
StartTime = startTime,
EndTime = endTime,
Locations = pts
};
if (ribbonCache == null)
{
throw new InvalidOperationException();
}
ribbonCache[bezierIndex] = pointCache;
++bezierIndex;
}
}
if (ribbonLength <= 0)
{
// An empty ribbon.
SetVertices(createParams.Device, (RibbonVertex[])null);
SetIndices(createParams.Device, null);
}
else
{
// Normal case.
foreach (var rp in createParams.RibbonParameters)
{
if (!rp.Visible)
{
continue;
}
if (rp.IsLine)
{
vertexCount += 4;
indexCount += 6;
}
else
{
vertexCount += (slice + 1) * 2;
indexCount += slice * 6;
}
}
var z = createParams.Z;
var foldedZ = z - createParams.LayerDepth / 2;
var vertices = new RibbonVertex[vertexCount];
var indices = new ushort[indexCount];
var vertexStart = 0;
var indexStart = 0;
// Generated vertex order for a non-folded fragment:
// 1---2
// | / |
// 3---4
// (1,2,3) (4,3,2)
var processedRibbonLength = 0f;
bezierIndex = 0;
var traceCalculator = createParams.AnimationCalculator;
var textureTopYRatio = createParams.TextureTopYRatio;
var textureBottomYRatio = createParams.TextureBottomYRatio;
for (var i = 0; i < createParams.RibbonParameters.Length; ++i)
{
var rp = createParams.RibbonParameters[i];
if (!rp.Visible)
{
continue;
}
var notePair = createParams.NotePairs[i];
// Normal ribbon is flowing from top to bottom (Y1 < Y2); CGSS would have a part from downside to upside.
// If this fragment is folded, we must place it under the normal layer (z - layerDepth / 2).
bool isFragmentFolded;
float zToUse;
float perc;
float v;
if (rp.IsLine)
{
var startRadius = traceCalculator.GetNoteRadius(notePair.Start, now, visualNoteMetrics, animationMetrics);
var endRadius = traceCalculator.GetNoteRadius(notePair.End, now, visualNoteMetrics, animationMetrics);
isFragmentFolded = rp.Y1 > rp.Y2;
zToUse = isFragmentFolded ? foldedZ : z;
perc = processedRibbonLength / ribbonLength;
v = MathHelper.Lerp(textureTopYRatio, textureBottomYRatio, perc);
var leftTopVertex = new RibbonVertex(rp.X1 - endRadius.X / 2, rp.Y1, zToUse, 0, 0, 1, 0, v);
var rightTopVertex = new RibbonVertex(rp.X1 + endRadius.X / 2, rp.Y1, zToUse, 0, 0, 1, 1, v);
perc = (processedRibbonLength + Math.Abs(rp.Y1 - rp.Y2)) / ribbonLength;
v = MathHelper.Lerp(textureTopYRatio, textureBottomYRatio, perc);
var leftBottomVertex = new RibbonVertex(rp.X2 - startRadius.X / 2, rp.Y2, zToUse, 0, 0, 1, 0, v);
var rightBottomVertex = new RibbonVertex(rp.X2 + startRadius.X / 2, rp.Y2, zToUse, 0, 0, 1, 1, v);
vertices[vertexStart] = leftTopVertex;
vertices[vertexStart + 1] = rightTopVertex;
vertices[vertexStart + 2] = leftBottomVertex;
vertices[vertexStart + 3] = rightBottomVertex;
if (isFragmentFolded)
{
indices[indexStart] = (ushort)(vertexStart + 2);
indices[indexStart + 1] = (ushort)(vertexStart + 1);
indices[indexStart + 2] = (ushort)vertexStart;
indices[indexStart + 3] = (ushort)(vertexStart + 1);
indices[indexStart + 4] = (ushort)(vertexStart + 2);
indices[indexStart + 5] = (ushort)(vertexStart + 3);
}
else
{
indices[indexStart] = (ushort)vertexStart;
indices[indexStart + 1] = (ushort)(vertexStart + 1);
indices[indexStart + 2] = (ushort)(vertexStart + 2);
indices[indexStart + 3] = (ushort)(vertexStart + 3);
indices[indexStart + 4] = (ushort)(vertexStart + 2);
indices[indexStart + 5] = (ushort)(vertexStart + 1);
}
vertexStart += 4;
indexStart += 6;
processedRibbonLength += Math.Abs(rp.Y1 - rp.Y2);
}
else
{
if (ribbonCache == null)
{
throw new InvalidOperationException();
}
var cache = ribbonCache[bezierIndex];
var deltaTime = cache.EndTime - cache.StartTime;
for (var j = 0; j <= slice; ++j)
{
var t = (float)j / slice;
var ribbonTime = cache.EndTime - deltaTime * t;
var pt = cache.Locations[j];
if (j < slice)
{
isFragmentFolded = pt.Y > cache.Locations[j + 1].Y;
}
else
{
// Here, j = slice
isFragmentFolded = cache.Locations[slice - 1].Y > pt.Y;
}
zToUse = isFragmentFolded ? foldedZ : z;
var noteRadius = traceCalculator.GetNoteRadius(notePair.Start, ribbonTime, visualNoteMetrics, animationMetrics);
perc = processedRibbonLength / ribbonLength;
v = MathHelper.Lerp(textureTopYRatio, textureBottomYRatio, perc);
var leftVertex = new RibbonVertex(pt.X - noteRadius.X / 2, pt.Y, zToUse, 0, 0, 1, 0, v);
var rightVertex = new RibbonVertex(pt.X + noteRadius.X / 2, pt.Y, zToUse, 0, 0, 1, 1, v);
vertices[vertexStart + j * 2] = leftVertex;
vertices[vertexStart + j * 2 + 1] = rightVertex;
if (j < slice)
{
if (isFragmentFolded)
{
indices[indexStart + j * 6] = (ushort)(vertexStart + j * 2 + 2);
indices[indexStart + j * 6 + 1] = (ushort)(vertexStart + j * 2 + 1);
indices[indexStart + j * 6 + 2] = (ushort)(vertexStart + j * 2);
indices[indexStart + j * 6 + 3] = (ushort)(vertexStart + j * 2 + 1);
indices[indexStart + j * 6 + 4] = (ushort)(vertexStart + j * 2 + 2);
indices[indexStart + j * 6 + 5] = (ushort)(vertexStart + j * 2 + 3);
}
else
{
indices[indexStart + j * 6] = (ushort)(vertexStart + j * 2);
indices[indexStart + j * 6 + 1] = (ushort)(vertexStart + j * 2 + 1);
indices[indexStart + j * 6 + 2] = (ushort)(vertexStart + j * 2 + 2);
indices[indexStart + j * 6 + 3] = (ushort)(vertexStart + j * 2 + 3);
indices[indexStart + j * 6 + 4] = (ushort)(vertexStart + j * 2 + 2);
indices[indexStart + j * 6 + 5] = (ushort)(vertexStart + j * 2 + 1);
}
processedRibbonLength += Math.Abs(cache.Locations[j + 1].Y - cache.Locations[j].Y);
}
}
vertexStart += (slice + 1) * 2;
indexStart += slice * 6;
++bezierIndex;
}
}
_vertices = vertices;
_indices = indices;
SetVertices(createParams.Device, vertices);
SetIndices(createParams.Device, indices);
}
}
public static Vector2 CalculateCubicBezier(this RibbonParameters rp, float t)
{
return(RibbonMathHelper.CubicBezier(rp, t));
}