void BlitInternal(int i0, int i1, int i2, Vector2[] verts, Vector2[] uv, PlotDelegate plotDelegate)
{
SortIndex(i0, i1, i2, verts, out i0, out i1, out i2);
var v0 = verts[i0];
var v1 = verts[i1];
var v2 = verts[i2];
var uv0 = uv[i0];
var uv1 = uv[i1];
var uv2 = uv[i2];
if (v0.y == v1.y)
{
BlitTriangle(v0, v1, v2, uv0, uv1, uv2, plotDelegate);
}
else if (v1.y == v2.y)
{
BlitTriangle(v1, v2, v0, uv1, uv2, uv0, plotDelegate);
}
else
{
var y = v1.y;
var x = v0.x - (v0.y - y) / (v0.y - v2.y) * (v0.x - v2.x);
var v3 = new Vector2(x, y);
var uv3 = uv2 + (uv1 - uv2) * (v3 - v2).magnitude / (v0 - v2).magnitude;
BlitTriangle(v1, v3, v0, uv1, uv3, uv0, plotDelegate);
BlitTriangle(v1, v3, v2, uv1, uv3, uv2, plotDelegate);
}
}
void BlitHorizontalLine(int x0, int x1, int y, Vector2 uv0, Vector2 uv1, PlotDelegate plotDelegate)
{
if (x0 > x1)
{
MUtils.Swap(ref x0, ref x1);
}
float xx0, yy0;
Vector2 newUv = Vector2.zero;
for (int x = x0; x <= x1; ++x)
{
ToWorldSpace(x, y, out xx0, out yy0);
plotDelegate(new Vector2(xx0, yy0), newUv);
}
}
public void Blit(SpriteRenderer spr, PlotDelegate plotDelegate)
{
var sp = spr.sprite;
var verts = sp.vertices;
ToBlitSpace(verts, spr.transform);
// bounds
var uv = sp.uv;
// blit each triangle
var tris = sp.triangles;
for (int i = 0; i < tris.Length; i += 3)
{
var i0 = tris[i + 0];
var i1 = tris[i + 1];
var i2 = tris[i + 2];
BlitInternal(i0, i1, i2, verts, uv, plotDelegate);
}
}
/*
* . v0
* / \
* v1 /___\ v2
*
*/
void BlitUpperTriangle(Vector2 v0, Vector2 v1, Vector2 v2, Vector2 uv0, Vector2 uv1, Vector2 uv2, PlotDelegate plotDelegate)
{
if (v1.x > v2.x)
{
MUtils.Swap(ref v1, ref v2);
}
var L1 = new RasterizedLine(v1, v0);
var i1 = L1.CreatePixelIterator();
int y0 = int.MinValue;
int x0;
int x1;
float dx = v2.x - v0.x;
float dy = v0.y - v2.y;
Vector2 newUv0 = Vector2.zero;
Vector3 newUv1 = Vector2.zero;
if (dy != 0)
{
while (NextY(i1, y0, out x0, out y0))
{
x1 = Mathf.RoundToInt(v2.x - dx * (y0 - v2.y) / dy);
BlitHorizontalLine(x0, x1, y0, newUv0, newUv1, plotDelegate);
}
}
}
public static void Rasterize(this SpriteRenderer spr, Target target, PlotDelegate plotDelegate)
{
target.Blit(spr, plotDelegate);
}
/*
* v0 ---- v1
\ /
\/
\ v2
*/
void BlitTriangle(Vector2 v0, Vector2 v1, Vector2 v2, Vector2 uv0, Vector2 uv1, Vector2 uv2, PlotDelegate plotDelegate)
{
if (v0.x > v1.x)
{
MUtils.Swap(ref v0, ref v1);
}
var L1 = new RasterizedLine(v0, v2);
var L2 = new RasterizedLine(v1, v2);
var i1 = L1.CreatePixelIterator();
var i2 = L2.CreatePixelIterator();
Vector2 newUv0 = Vector2.zero;
Vector3 newUv1 = Vector2.zero;
var pList1 = ArrayPool <RasterizedLine.Pixel> .Get();
var pList2 = ArrayPool <RasterizedLine.Pixel> .Get();
CacheYOnChanged(i1, pList1);
CacheYOnChanged(i2, pList2);
if (CheckSequence(pList1, pList2))
{
for (int i = 0; i < pList1.length; ++i)
{
var a = pList1[i];
var b = pList2[i];
BlitHorizontalLine(a.x, b.x, a.y, newUv0, newUv1, plotDelegate);
}
}
else
{
for (int i = 0; i < pList1.length; ++i)
{
var a = pList1[i];
var b = pList2[-i - 1];
BlitHorizontalLine(a.x, b.x, a.y, newUv0, newUv1, plotDelegate);
}
}
ArrayPool <RasterizedLine.Pixel> .Release(pList1);
ArrayPool <RasterizedLine.Pixel> .Release(pList2);
}
