void FrameBuffer::Draw3DPoint(V3 pt, PPC *ppc, int psize, V3 color) {
V3 ppt;
if (!ppc->Project(pt, ppt))
return;
DrawPoint((int)ppt[0], (int)ppt[1], psize, color.getColor());
}
void TMesh::RenderFilled(PPC *ppc, FrameBuffer *fb, unsigned int color, V3 L,
float ka, float se, int tm, int tl)
{
//Project all vertices
V3 *pverts = new V3[vertsN];
for (int vi = 0; vi < vertsN; vi++) {
ppc->Project(verts[vi], pverts[vi]);
}
for (int tri = 0; tri < trisN; tri++) {
int vinds[3];
vinds[0] = tris[tri*3+0];
vinds[1] = tris[tri*3+1];
vinds[2] = tris[tri*3+2];
// Do not render triangle if any of its vertices had an invalid projection
if (pverts[vinds[0]][0] == FLT_MAX ||
pverts[vinds[1]][0] == FLT_MAX ||
pverts[vinds[2]][0] == FLT_MAX)
continue;
// Compute bounding box aabb of projected vertices
AABB aabb(pverts[vinds[0]]);
aabb.AddPoint(pverts[vinds[1]]);
aabb.AddPoint(pverts[vinds[2]]);
// Clip aabb with frame
if (!aabb.Clip(0.0f, (float) fb->w, 0.0f, (float) fb->h)) {
continue;
}
// Setup edge equations ee0, ee1, ee2
V3 eeqs[3];
SetEEQS(pverts[vinds[0]], pverts[vinds[1]], pverts[vinds[2]], eeqs);
//Setup coefficient matrix
M33 ptm;
ptm[0] = pverts[vinds[0]];
ptm[1] = pverts[vinds[1]];
ptm[2] = pverts[vinds[2]];
ptm.setColumn(2, V3(1.0f, 1.0f, 1.0f));
ptm = ptm.inverse();
//Get colors at verts
V3 reds(cols[vinds[0]][0], cols[vinds[1]][0], cols[vinds[2]][0]);
V3 greens(cols[vinds[0]][1], cols[vinds[1]][1], cols[vinds[2]][1]);
V3 blues(cols[vinds[0]][2], cols[vinds[1]][2], cols[vinds[2]][2]);
// Setup screen space interpolation of depth: zABC
V3 zABC = ptm*V3(pverts[vinds[0]][2],
pverts[vinds[1]][2], pverts[vinds[2]][2]);
//Setup screen space interpolation of normals
V3 nxABC = ptm*V3(normals[vinds[0]][0],
normals[vinds[1]][0], normals[vinds[2]][0]);
V3 nyABC = ptm*V3(normals[vinds[0]][1],
normals[vinds[1]][1], normals[vinds[2]][1]);
V3 nzABC = ptm*V3(normals[vinds[0]][2],
normals[vinds[1]][2], normals[vinds[2]][2]);
//Model space interpolation parameters
M33 msiQ = GetMSIQ(verts[vinds[0]], verts[vinds[1]], verts[vinds[2]], ppc);
V3 denABC = msiQ[0] + msiQ[1] + msiQ[2];
V3 redNABC(msiQ.getColumn(0) * reds, msiQ.getColumn(1) * reds,
msiQ.getColumn(2) * reds);
V3 greenNABC(msiQ.getColumn(0) * greens, msiQ.getColumn(1) * greens,
msiQ.getColumn(2) * greens);
V3 blueNABC(msiQ.getColumn(0) * blues, msiQ.getColumn(1) * blues,
msiQ.getColumn(2) * blues);
//Texture coordinates interpolation
V3 sNumABC, tNumABC, sABC, tABC;
if (tcs) {
V3 ss(tcs[2*vinds[0]+0], tcs[2*vinds[1]+0], tcs[2*vinds[2]+0]);
V3 ts(tcs[2*vinds[0]+1], tcs[2*vinds[1]+1], tcs[2*vinds[2]+1]);
sNumABC = V3(msiQ.getColumn(0) * ss, msiQ.getColumn(1) * ss,
msiQ.getColumn(2) * ss);
tNumABC = V3(msiQ.getColumn(0) * ts, msiQ.getColumn(1) * ts,
msiQ.getColumn(2) * ts);
sABC = ptm * ss;
tABC = ptm * ts;
}
// For every pixel in the bounding box
int top = (int) (aabb.corners[0][1] + 0.5f);
int bottom = (int) (aabb.corners[1][1] - 0.5f);
int left = (int) (aabb.corners[0][0] + 0.5f);
int right = (int) (aabb.corners[1][0] - 0.5f);
for (int v = top; v <= bottom; v++) {
for (int u = left; u <= right; u++) {
V3 pixv(.5f + (float)u, .5f + (float)v, 1.0f);
//Check edge equations
if (eeqs[0]*pixv < 0.0f ||
eeqs[1]*pixv < 0.0f ||
eeqs[2]*pixv < 0.0f)
continue;
// Check z-buffer
float currz = zABC * pixv;
if (fb->IsFarther(u, v, currz))
continue;
fb->SetZ(u, v, currz);
V3 currColor;
float msdn = denABC * pixv;
V3 fullColor;
if (tcs) {
float currs = sABC * pixv;
float currt = tABC * pixv;
int ut, vt;
ut=vt=0;
if (tm == 0) { //nearest neighbor
ut = (int) (currs * (float) texture->w);
vt = (int) (currt * (float) texture->h);
}
else if(tm == 1) { //bilinear
}
fullColor.setFromColor(texture->Get(ut, vt));
}
else {
fullColor = V3(redNABC * pixv, greenNABC * pixv, blueNABC * pixv) / msdn;
}
V3 currNormal, lv;
V3 pp(pixv);
pp[2] = currz;
lv = (L - ppc->UnProject(pp)).normalize();
currNormal = V3(nxABC*pixv, nyABC*pixv, nzABC*pixv).normalize();
float kd = lv * currNormal;
kd = (kd < 0.0f) ? 0.0f : kd;
float ks = 0; //pow(reflectedLightVector * eyeVector, se)
currColor = fullColor * (ka + (1.0f-ka)*kd + ks);
fb->Set(u, v, currColor.getColor());
}
}
}
delete []pverts;
}
