public static void DrawXAlignedTexturedTriangle(this HdrBuffer image,
double3 pStart, double endX1, double endX2, double sideY,
double endZ1, double endZ2,
double2 tStart, double2 endT1, double2 endT2,
Sampler2d sampler, double tpp)
{
int w1 = image.Size.width - 1,
h1 = image.Size.height - 1;
if ((pStart.y < 0 && sideY < 0) ||
(pStart.y > h1 && sideY > h1) ||
(pStart.x < 0 && endX1 < 0 && endX2 < 0) ||
(pStart.x > w1 && endX1 > w1 && endX2 > w1))
{
return;
}
if (endX1 > endX2)
{
Util.Swap(ref endX1, ref endX2);
Util.Swap(ref endZ1, ref endZ2);
Util.Swap(ref endT1, ref endT2);
}
double dy = Math.Abs(sideY - pStart.y);
var x1Lerp = pStart.x.LerpTo(endX1, dy).GetInterpolator();
var x2Lerp = pStart.x.LerpTo(endX2, dy).GetInterpolator();
var z1Lerp = pStart.z.ZLerpTo(endZ1, dy, pStart.z, endZ1).GetInterpolator();
var z2Lerp = pStart.z.ZLerpTo(endZ2, dy, pStart.z, endZ2).GetInterpolator();
var t1Lerp = tStart.ZLerpTo(endT1, dy, pStart.z, endZ1).GetInterpolator();
var t2Lerp = tStart.ZLerpTo(endT2, dy, pStart.z, endZ2).GetInterpolator();
var yRasterizer = Rasterizer.Create <object> (0, h1, pStart.y, sideY, null,
x1Lerp, x2Lerp,
z1Lerp, z2Lerp,
t1Lerp, t2Lerp
);
foreach (var ySample in yRasterizer)
{
int iy = ySample.Item1.PreciseRound();
double x1 = x1Lerp.Current;
double x2 = x2Lerp.Current;
double z1 = z1Lerp.Current;
double z2 = z2Lerp.Current;
double2 t1 = t1Lerp.Current;
double2 t2 = t2Lerp.Current;
double dx = Math.Abs(x2 - x1);
if (dx == 0)
{
continue; // FIXIT: draw 1 pixel or...
}
var zLerp = z1.ZLerpTo(z2, dx, z1, z2).GetInterpolator();
var tLerp = t1.ZLerpTo(t2, dx, z1, z2).GetInterpolator();
var xRasterizer = Rasterizer.Create <object> (0, w1, x1, x2, null,
zLerp, tLerp);
foreach (var xSample in xRasterizer)
{
int ix = xSample.Item1.PreciseRound();
double z = zLerp.Current;
double2 t = tLerp.Current;
double lod = Math.Log(tpp * z, 2);
if (ShowLods)
{
// Grayscale lods
//double intLod = ( double ) ( int ) lod / sampler.Map.NumLods;
//double realLod = lod / sampler.Map.NumLods;
//image.Values [ix, iy] = new double3 ( realLod, intLod, intLod );
// Colored lods
int intLod = ( int )Math.Abs(lod);
if (intLod != 0)
{
double lodMagnitude = 0.5;
double3 lodColor = double3.Zero;
if ((intLod & 1) == 1)
{
lodColor [0] = lodMagnitude;
}
if ((intLod & 2) == 2)
{
lodColor [1] = lodMagnitude;
}
if ((intLod & 4) == 4)
{
lodColor [2] = lodMagnitude;
}
double3 c = sampler.GetColor(t, lod);
image.Values [ix, iy] = (lodColor + c) * 0.5;
}
else
{
image.Values [ix, iy] = sampler.GetColor(t, lod);
}
}
else
{
image.Values [ix, iy] = sampler.GetColor(t, lod);
}
}
}
}
