private byte[,] fillFlatTop(byte[,] image, Mesh.point3[] sortedPoints, Mesh.point3[] unsortedPoints, byte[] brightness, Mesh.point2[] uvs = null)
{
float startX = sortedPoints[2].x;
float endX = sortedPoints[2].x;
float invslope1 = (float)(sortedPoints[2].x - sortedPoints[0].x) / (float)(sortedPoints[2].y - sortedPoints[0].y);
float invslope2 = (float)(sortedPoints[2].x - sortedPoints[1].x) / (float)(sortedPoints[2].y - sortedPoints[1].y);
for (int scanlineY = (int)sortedPoints[2].y; scanlineY > sortedPoints[0].y; scanlineY--)
{
drawLine(image, (int)startX, scanlineY, (int)endX, scanlineY, false, unsortedPoints, brightness, uvs);
startX -= invslope1;
endX -= invslope2;
}
return (image);
}
private byte[,] fillFlatBottom(byte[,] image, Mesh.point3[] sortedPoints, Mesh.point3[] unsortedPoints, byte[] brightness, Mesh.point2[] uvs = null)
{
float invslope1 = (float)(sortedPoints[2].x - sortedPoints[0].x) / (float)(sortedPoints[2].y - sortedPoints[0].y);
float invslope2 = (float)(sortedPoints[0].x - sortedPoints[1].x) / (float)(sortedPoints[0].y - sortedPoints[1].y);
float curx1 = sortedPoints[0].x;
float curx2 = sortedPoints[0].x;
for (int scanlineY = (int)sortedPoints[0].y; scanlineY <= sortedPoints[1].y; scanlineY++)
{
drawLine(image, (int)curx1, scanlineY, (int)curx2, scanlineY, false, unsortedPoints, brightness, uvs);
curx1 += invslope1;
curx2 += invslope2;
}
return (image);
}
public byte[,] drawLine(byte[,] image, /*start*/int x0, int y0, int x1, int y1,/*end*/ bool drawWireFrame, Mesh.point3[] unsortedPoints = null, byte[] color = null, Mesh.point2[] uvs = null)
{
float rise = y1 - y0;
float run = x1 - x0;
byte txl = 219;
//if (color != null)
//{
// color[0] = 0;
// color[1] = 50;
// color[2] = 100;
//}
if (run == 0)
{
if (drawWireFrame)
txl = 124;// |
if (y0 > y1)
swap(ref y0, ref y1);
while (y0 < y1)//DRAW
{
image[x0, y0] = txl;
y0++;
}
return (image);
}
float m = rise / run;
if (-1 <= rise / run && rise / run <= 1)
{
if (drawWireFrame)
{
if (rise / run > 0.5)
txl = 92;// /
else if (rise / run < -0.5)
txl = 47;// \
else
txl = 95;// -
}
if (x0 > x1)
{
swap(ref x0, ref x1);
swap(ref y0, ref y1);
}
float y = y0;
float x = x0;
float denom = 0;
if (!drawWireFrame)
denom = ((unsortedPoints[1].y - unsortedPoints[2].y) * (unsortedPoints[0].x - unsortedPoints[2].x) + (unsortedPoints[2].x - unsortedPoints[1].x) * (unsortedPoints[0].y - unsortedPoints[2].y));
while (x <= x1 && y < RENDER_HEIGHT && x < RENDER_WIDTH && y >= 0)
{
if (x > 0)//clipping logic < ^
{
int xtoi = (int)x;
int ytoi = (int)y;
if (drawWireFrame)
{
image[xtoi, ytoi] = txl;
y += m;
}
else//HERE'S WHERE WE DRAW TRIANGLES!
{
float b1 = (((unsortedPoints[1].y - unsortedPoints[2].y) * (x - unsortedPoints[2].x)) + ((unsortedPoints[2].x - unsortedPoints[1].x) * (y - unsortedPoints[2].y))) / denom;
float b2 = (((unsortedPoints[2].y - unsortedPoints[0].y) * (x - unsortedPoints[2].x)) + ((unsortedPoints[0].x - unsortedPoints[2].x) * (y - unsortedPoints[2].y))) / denom;
float b3 = 1 - b1 - b2;
int interpolatedZ = (int)(b1 * unsortedPoints[0].z + b2 * unsortedPoints[1].z + b3 * unsortedPoints[2].z);
if (interpolatedZ > zBuffer[xtoi, ytoi])
{ // use barycentric interpolation to do everything..
float interpU = (float)(b1 * uvs[0].x + b2 * uvs[1].x + b3 * uvs[2].x);
float interpV = (float)(b1 * uvs[0].y + b2 * uvs[1].y + b3 * uvs[2].y);
float interpBright = color[1];// + b2 * (float)color[1] + b3 * (float)color[2]);
Material someMat = someShape.matIDs[targFace.matID-1];
int xpos = Math.Min(Math.Max((int)(interpU * someMat.SIZE), 0), someMat.SIZE-1);
int ypos = Math.Min(Math.Max((int)(interpV * someMat.SIZE), 0), someMat.SIZE-1);
byte fa = someMat.bitmapColorsCached[(int)clamp(xpos, 0, someMat.SIZE-1), (int)clamp(ypos, 0, someMat.SIZE-1)];
image[xtoi, ytoi] = (byte)(Convert.ToInt32(levels[(int)clamp(fa + interpBright, 0, 255)]));
zBuffer[xtoi, ytoi] = interpolatedZ;
}
}
}
x++;
}
}
else
{
if (run / rise > 0.5)
txl = 92;// /
else if (run / rise < -0.5)
txl = 47;// \
else
txl = 124;// -
if (y0 > y1)
{
swap(ref x0, ref x1);
swap(ref y0, ref y1);
}
float x = x0;
float invSlope = 1 / m;
while (y0 < y1)
{
image[(int)x, y0] = txl;
x += invSlope;
y0++;
}
}
return (image);
}
private byte[,] drawTriangle(byte[,] image, Mesh.point3[] points, Mesh.point2[] uvs, byte[] brightness = null)
{
/*
* A
* B-------
* C
*
*/
//sort by lowest y value (highest on screen)
Mesh.point3[] unsortedPoints = new Mesh.point3[3];
points.CopyTo(unsortedPoints, 0);
if (points[1].y < points[0].y)
{//swap point[1] and point[0]
swap(ref points[0].y, ref points[1].y);
swap(ref points[0].x, ref points[1].x);
}
if (points[2].y < points[0].y)
{//swap point[0] and point[2]
swap(ref points[0].y, ref points[2].y);
swap(ref points[0].x, ref points[2].x);
}
if (points[2].y < points[1].y)
{//swap point[1] & point[2]
swap(ref points[1].y, ref points[2].y);
swap(ref points[1].x, ref points[2].x);
}
if (points[0].y == points[1].y)
{//flat top
image = fillFlatTop(image, points, unsortedPoints, brightness, uvs);
}
else if (points[1].y == points[2].y)
{//flat bottom
image = fillFlatBottom(image, points, unsortedPoints, brightness, uvs);
}
else
{//nontrivial
Mesh.point3 midpoint = new Mesh.point3((int)(Math.Ceiling(points[0].x + ((float)(points[1].y - points[0].y) / (float)(points[2].y - points[0].y)) * (points[2].x - points[0].x))), points[1].y);
fillFlatBottom(image, new Mesh.point3[] { points[0], points[1], midpoint }, unsortedPoints, brightness, uvs);
fillFlatTop(image, new Mesh.point3[] { points[1], midpoint, points[2] }, unsortedPoints, brightness, uvs);
}
return (image);
}
public byte[,] renderWire(Mesh someShape)
{
byte[,] image = new byte[RENDER_WIDTH, RENDER_HEIGHT];//
for (int x = 0; x < RENDER_WIDTH; x++)
for (int y = 0; y < RENDER_HEIGHT; y++)
image[x, y] = 32;
foreach (Mesh.triangle f in someShape.faces)
{
for (int i = 0; i < 3; i++)//each vertex
{
double depth = someShape.verts[f.vertIDs[i]].z;
int P_x1 = (int)((RENDER_WIDTH / 2) + someShape.verts[f.vertIDs[i]].x / depth);
int P_y1 = (int)(((RENDER_HEIGHT - 15) / 2) + someShape.verts[f.vertIDs[i]].y / depth);
if (P_y1 < RENDER_HEIGHT - 1 && P_y1 >= 0 && P_x1 < RENDER_WIDTH - 1 && P_x1 >= 0)//the vert is in bounds with the screen
for (int j = 0; j < 2; j++)//each of the 2 neighboring verts
{
double depth2 = someShape.verts[f.vertIDs[j]].z;
int P_x = (int)((RENDER_WIDTH / 2) + someShape.verts[f.vertIDs[j]].x / depth2);
int P_y = (int)(((RENDER_HEIGHT - 15) / 2) + someShape.verts[f.vertIDs[j]].y / depth2);
if (P_y < RENDER_HEIGHT - 1 && P_y >= 0 && P_x < RENDER_WIDTH - 1 && P_x >= 0)
image = drawLine(image, P_x, P_y, P_x1, P_y1, true);
}
}
}
return (image);
}
public byte[,] renderVerts(Mesh someShape)
{
byte[,] image = new byte[RENDER_WIDTH, RENDER_HEIGHT];//
for (int x = 0; x < RENDER_WIDTH; x++)
for (int y = 0; y < RENDER_HEIGHT; y++)
image[x, y] = 32;
foreach (Mesh.triangle f in someShape.faces)
{
for (int i = 0; i < 3; i++)//each vertex
{
double depth = someShape.verts[f.vertIDs[i]].z;
int P_x1 = (int)(someShape.verts[f.vertIDs[i]].x / depth);
int P_y1 = (int)(someShape.verts[f.vertIDs[i]].y / depth);
if (P_y1 < RENDER_HEIGHT - 1 && P_y1 >= 0 && P_x1 < RENDER_WIDTH - 1 && P_x1 >= 0)//the vert is in bounds with the screen
image[P_x1, P_y1] = 177;
}
}
return (image);
}
