private void RenderTriangle2(Vertex _v1, Vertex _v2, Vertex _v3, Material material, Float3 lightDirection)
{
IVertex v1 = new IVertex(_v1);
IVertex v2 = new IVertex(_v2);
IVertex v3 = new IVertex(_v3);
if (v1.y > v2.y) Utils.swap(ref v1, ref v2);
if (v1.y > v3.y) Utils.swap(ref v1, ref v3);
if (v2.y > v3.y) Utils.swap(ref v2, ref v3);
int triangleYHeight = v3.y - v1.y + 1;
int firstSegmentHeight = v2.y - v1.y + 1;
int secondSegmentHeight = v3.y - v2.y + 1;
for (int y = v1.y; y <= v3.y; y++)
{
bool isFirstSegment = y < v2.y;
int segmentStartY = isFirstSegment ? v1.y : v2.y;
float alpha = (float)(y - v1.y) / (float)triangleYHeight;
IVertex A = IVertex.lerp(v1, v3, alpha);
float beta = (float)(y - segmentStartY) / (float)(isFirstSegment ? firstSegmentHeight : secondSegmentHeight);
IVertex B = IVertex.lerp(isFirstSegment ? v1 : v2, isFirstSegment ? v2 : v3, beta);
if (A.x > B.x)
Utils.swap(ref A, ref B);
for (int x = A.x; x <= B.x; x++)
{
// check extremes
float delta = (A.x == B.x) ? 1.0f : (float)(x - A.x) / (float)(B.x - A.x);
IVertex C = IVertex.lerp(A, B, delta);
float lc = getLamberComponent(C.normal, lightDirection);
int intLambert = (int)(lc * 255);
Color c = Color.FromArgb(intLambert, intLambert, intLambert);
c = tex2D(material.diffuseTexture, C.u, C.v);
DrawPointToFrameBuffer(x, y, C.z, c);
}
}
}
private void RenderRegular(Mesh mesh, Material material, Float3 lightDirection)
{
rasterizer.Rasterize(mesh, material, lightDirection);
// FRAGMENT SHADER
for (int x = 0; x < Defaults.WIDTH; x++)
for (int y = 0; y < Defaults.HEIGHT; y++)
bitmap.elDrawPoint(x, y, zBuffer[x, y].color);
}
public void Rasterize(Mesh mesh, Material material, Float3 lightDirection)
{
// set interpolated color
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
//v2.normal = v1.normal;
//v3.normal = v1.normal;
int cc1 = (int)(getLamberComponent(v1.normal, lightDirection) * 255);
int cc2 = (int)(getLamberComponent(v2.normal, lightDirection) * 255);
int cc3 = (int)(getLamberComponent(v3.normal, lightDirection) * 255);
v1.color = Color.FromArgb(cc1, cc1, cc1);//.lerpTo(Color.Green, 0.5f);
v2.color = Color.FromArgb(cc2, cc2, cc2);//.lerpTo(Color.Blue, 0.5f);
v3.color = Color.FromArgb(cc3, cc3, cc3);//.lerpTo(Color.Red, 0.5f);
}
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
RenderTriangle2(v1, v2, v3, material, lightDirection);
}
}
