protected static void _PrepareLine(ref Internal.VertexBuffer <GeometryVertex> vb, ref Internal.IndexBuffer ib, ref GeometryDrawCall dc)
{
var vw = vb.GetWriter(2);
var iw = ib.GetWriter(LineIndices.Length, ref vw);
vw.Write(MakeVertex(dc.Vector0.X, dc.Vector0.Y, dc.Z, dc.Color0));
vw.Write(MakeVertex(dc.Vector1.X, dc.Vector1.Y, dc.Z, dc.Color1));
iw.Write(LineIndices);
}
public static unsafe void _PrepareRing(ref Internal.VertexBuffer <GeometryVertex> vb, ref Internal.IndexBuffer ib, ref GeometryDrawCall dc)
{
int numPoints = ComputeRingPoints(ref dc.Vector2);
const int vertexStride = 2;
const int indexStride = 6;
var vw = vb.GetWriter(numPoints * vertexStride);
var iw = ib.GetWriter((numPoints - 1) * indexStride, ref vw);
float a = dc.Scalar0;
float step = (float)((dc.Scalar1 - dc.Scalar0) / (numPoints - 1));
float cos, sin;
float colorA = 0, colorStep = 1.0f / (numPoints - 1);
var vertexInner = new GeometryVertex(new Vector3(0, 0, dc.Z), dc.Color0);
var vertexOuter = new GeometryVertex(new Vector3(0, 0, dc.Z), dc.Color1);
fixed(GeometryVertex *pVertices = &vw.Storage.Array[vw.Storage.Offset])
fixed(ushort *pIndices = &iw.Storage.Array[iw.Storage.Offset])
for (int i = 0, j = 0, k = 0; i < numPoints; i++, j += vertexStride, k += indexStride)
{
cos = (float)Math.Cos(a);
sin = (float)Math.Sin(a);
vertexInner.Position.X = dc.Vector0.X + (float)(cos * dc.Vector1.X);
vertexInner.Position.Y = dc.Vector0.Y + (float)(sin * dc.Vector1.Y);
vertexInner.Color = Color.Lerp(dc.Color0, dc.Color2, colorA);
pVertices[j] = vertexInner;
vertexOuter.Position.X = dc.Vector0.X + (float)(cos * dc.Vector2.X);
vertexOuter.Position.Y = dc.Vector0.Y + (float)(sin * dc.Vector2.Y);
vertexOuter.Color = Color.Lerp(dc.Color1, dc.Color3, colorA);
pVertices[j + 1] = vertexOuter;
if (i == (numPoints - 1))
{
break;
}
pIndices[k] = (ushort)(j + vw.IndexOffset);
pIndices[k + 1] = (ushort)(j + 1 + vw.IndexOffset);
pIndices[k + 2] = (ushort)(j + 3 + vw.IndexOffset);
pIndices[k + 3] = (ushort)(j + 2 + vw.IndexOffset);
pIndices[k + 4] = (ushort)(j + vw.IndexOffset);
pIndices[k + 5] = (ushort)(j + 3 + vw.IndexOffset);
a += step;
colorA += colorStep;
}
}
protected static void _PrepareQuadBorder(ref Internal.VertexBuffer <GeometryVertex> vb, ref Internal.IndexBuffer ib, ref GeometryDrawCall dc)
{
var vw = vb.GetWriter(8);
var iw = ib.GetWriter(QuadBorderIndices.Length, ref vw);
var tl = dc.Vector0;
var br = dc.Vector1;
var border = dc.Scalar0;
var vInner = new GeometryVertex(new Vector3(tl.X, tl.Y, dc.Z), dc.Color0);
var vOuter = new GeometryVertex(new Vector3(tl.X - border, tl.Y - border, dc.Z), dc.Color1);
vw.Write(ref vInner);
vw.Write(ref vOuter);
vInner.Position.X = br.X;
vOuter.Position.X = br.X + border;
vw.Write(ref vInner);
vw.Write(ref vOuter);
vInner.Position.Y = br.Y;
vOuter.Position.Y = br.Y + border;
vw.Write(ref vInner);
vw.Write(ref vOuter);
vInner.Position.X = tl.X;
vOuter.Position.X = tl.X - border;
vw.Write(ref vInner);
vw.Write(ref vOuter);
iw.Write(QuadBorderIndices);
}