private static Interpolator GetInterpolatorForFace(Face face, TriangleShade shade)
{
var useTexture = false;
if( null != face.Material && null != face.Material.DiffuseMap)
{
useTexture = true;
}
switch (shade)
{
case TriangleShade.Flat:
{
if( useTexture )
{
return TextureInterpolator;
}
return FlatInterpolator;
}
break;
case TriangleShade.Gouraud:
{
if (useTexture)
{
return TextureInterpolator;
}
return GouraudInterpolator;
}
break;
}
return null;
}
public void SetFace(int index, Face face)
{
var v1 = Vertices[face.B].Vector - Vertices[face.A].Vector;
var v2 = Vertices[face.C].Vector - Vertices[face.A].Vector;
var cross = v1.Cross(v2);
cross.Normalize();
face.Normal = cross;
var v = Vertices[face.A].Vector + Vertices[face.B].Vector + Vertices[face.C].Vector;
face.Position = v/3;
this.Faces[index] = face;
}
public void AllocateFaces(int count)
{
Faces = new Face[count];
}
public void SetFace(int index, Face face)
{
Faces[index] = face;
}
public static void Draw(IBuffers buffers, ISpanRenderer renderer, TriangleShade shade, Face face, Vertex[] vertices, TextureCoordinate[] textureCoordinates)
{
var vertexA = vertices[face.A];
var vertexB = vertices[face.B];
var vertexC = vertices[face.C];
var textureA = ZeroTextureCoordinate;
var textureB = ZeroTextureCoordinate;
var textureC = ZeroTextureCoordinate;
Image image = null;
ImageContext texture = null;
var useTexture = false;
if( null != face.Material && null != face.Material.DiffuseMap)
{
useTexture = true;
image = face.Material.DiffuseMap;
texture = face.Material.DiffuseMap.ImageContext as ImageContext;
textureA = textureCoordinates[face.DiffuseA];
textureB = textureCoordinates[face.DiffuseB];
textureC = textureCoordinates[face.DiffuseC];
}
/*
SetSphericalEnvironmentMapTextureCoordinate(ref vertexA, ref textureA);
SetSphericalEnvironmentMapTextureCoordinate(ref vertexB, ref textureB);
SetSphericalEnvironmentMapTextureCoordinate(ref vertexC, ref textureC);
*/
GetSortedPoints(ref vertexA, ref vertexB, ref vertexC, ref textureA, ref textureB, ref textureC);
var interpolator = GetInterpolatorForFace(face, shade);
var secondaryStartY = (int)(vertexB.TranslatedScreenCoordinates.Y - vertexA.TranslatedScreenCoordinates.Y);
var spreadCount = ((int)(vertexC.TranslatedScreenCoordinates.Y - vertexA.TranslatedScreenCoordinates.Y)) + 1;
interpolator.SetPoint(0, (int)vertexA.TranslatedScreenCoordinates.X, (int)vertexC.TranslatedScreenCoordinates.X);
interpolator.SetPoint(1, (int)vertexA.TranslatedScreenCoordinates.X, (int)vertexB.TranslatedScreenCoordinates.X, (int)vertexB.TranslatedScreenCoordinates.X, (int)vertexC.TranslatedScreenCoordinates.X, secondaryStartY);
interpolator.SetPoint(2, vertexA.DepthBufferAdjustedZ, vertexC.DepthBufferAdjustedZ);
interpolator.SetPoint(3, vertexA.DepthBufferAdjustedZ, vertexB.DepthBufferAdjustedZ, vertexB.DepthBufferAdjustedZ, vertexC.DepthBufferAdjustedZ, secondaryStartY);
if (useTexture)
{
interpolator.SetPoint(4, textureA.U, textureC.U);
interpolator.SetPoint(5, textureA.U, textureB.U, textureB.U, textureC.U, secondaryStartY);
interpolator.SetPoint(6, textureA.V, textureC.V);
interpolator.SetPoint(7, textureA.V, textureB.V, textureB.V, textureC.V, secondaryStartY);
}
var color = Color.FromArgb(0xff, 0xff, 0xff, 0xff);
if (shade == TriangleShade.Gouraud && !useTexture)
{
var vertexAColor = vertexA.Color.ToVector();
var vertexBColor = vertexB.Color.ToVector();
var vertexCColor = vertexC.Color.ToVector();
interpolator.SetPoint(4, vertexAColor.Red, vertexCColor.Red);
interpolator.SetPoint(5, vertexAColor.Red, vertexBColor.Red, vertexBColor.Red, vertexCColor.Red, secondaryStartY);
interpolator.SetPoint(6, vertexAColor.Green, vertexCColor.Green);
interpolator.SetPoint(7, vertexAColor.Green, vertexBColor.Green, vertexBColor.Green, vertexCColor.Green, secondaryStartY);
interpolator.SetPoint(8, vertexAColor.Blue, vertexCColor.Blue);
interpolator.SetPoint(9, vertexAColor.Blue, vertexBColor.Blue, vertexBColor.Blue, vertexCColor.Blue, secondaryStartY);
interpolator.SetPoint(10, vertexAColor.Alpha, vertexCColor.Alpha);
interpolator.SetPoint(11, vertexAColor.Alpha, vertexBColor.Alpha, vertexBColor.Alpha, vertexCColor.Alpha, secondaryStartY);
}
else
{
color = face.Color;
}
interpolator.Interpolate(spreadCount);
var yPosition = vertexA.TranslatedScreenCoordinates.Y;
var clip = false;
if( null == buffers )
{
return;
}
for (var index = 0; index < spreadCount; index++)
{
if( yPosition < 0 || yPosition >= buffers.Height )
{
clip = true;
} else
{
clip = false;
}
var span = GetSpan(index, interpolator, vertexA, useTexture);
if (null != span && !clip )
{
var actualSpan = (Span)span;
var swapIndex = ((Span)span).Swap ? 1 : 0;
actualSpan.ZStart = interpolator.Points[2 + swapIndex].InterpolatedValues[index];
actualSpan.ZEnd = interpolator.Points[3 - swapIndex].InterpolatedValues[index];
switch (shade)
{
case TriangleShade.Flat:
{
if (useTexture)
{
renderer.Texture(buffers, actualSpan, image, texture);
}
else
{
renderer.Flat(buffers, actualSpan, color);
}
}
break;
case TriangleShade.Gouraud:
{
if (useTexture)
{
renderer.Texture(buffers, actualSpan, image, texture);
}
else
{
actualSpan.ColorStart.Red = interpolator.Points[4 + swapIndex].InterpolatedValues[index];
actualSpan.ColorEnd.Red = interpolator.Points[5 - swapIndex].InterpolatedValues[index];
actualSpan.ColorStart.Green = interpolator.Points[6 + swapIndex].InterpolatedValues[index];
actualSpan.ColorEnd.Green = interpolator.Points[7 - swapIndex].InterpolatedValues[index];
actualSpan.ColorStart.Blue = interpolator.Points[8 + swapIndex].InterpolatedValues[index];
actualSpan.ColorEnd.Blue = interpolator.Points[9 - swapIndex].InterpolatedValues[index];
actualSpan.ColorStart.Alpha = interpolator.Points[10 + swapIndex].InterpolatedValues[index];
actualSpan.ColorEnd.Alpha = interpolator.Points[11 - swapIndex].InterpolatedValues[index];
renderer.Gouraud(buffers, actualSpan);
}
}
break;
}
}
yPosition++;
}
}