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;
}
/* Render Modes are
* -Vertex Color Interpolation
* -Texture Mapping
* Renders the triangle mess, shades using the sence lights.
* Shadow Mapping implimented
*/
void TMesh::RenderFilled(PPC *ppc, FrameBuffer *fb, unsigned int color, int lightsN,
Light **L, float ka, FrameBuffer *texture,
enviromap *cube, int renderMode) {
//Project vertices on to the camera
vector *pverts = new vector[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];
if( pverts[vinds[0]][2] == FLT_MAX ||
pverts[vinds[1]][2] == FLT_MAX ||
pverts[vinds[2]][2] == 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;
int left = (int)(aabb.corners[0][0] + 0.5f);
int right = (int)(aabb.corners[1][0] - 0.5f);
int top = (int)(aabb.corners[0][1] + 0.5f);
int bottom = (int)(aabb.corners[1][1] - 0.5f);
vector red( cols[vinds[0]][0], cols[vinds[1]][0], cols[vinds[2]][0]);
vector green( cols[vinds[0]][1], cols[vinds[1]][1], cols[vinds[2]][1]);
vector blue( cols[vinds[0]][2], cols[vinds[1]][2], cols[vinds[2]][2]);
vector depth( pverts[vinds[0]][2], pverts[vinds[1]][2], pverts[vinds[2]][2] );
vector rABC, gABC, bABC, zABC, nxABC, nyABC, nzABC, sABC, tABC;
vector DEF;
vector eeqs[3];
SetEEQS( pverts[vinds[0]], pverts[vinds[1]], pverts[vinds[2]], eeqs);
matrix ptm(pverts[vinds[0]], pverts[vinds[1]], pverts[vinds[2]]);
ptm.setCol(2, vector(1.0f, 1.0f, 1.0f));
ptm = invert(ptm);
// Set up for normals
vector nx( normals[vinds[0]][0], normals[vinds[1]][0], normals[vinds[2]][0] );
vector ny( normals[vinds[0]][1], normals[vinds[1]][1], normals[vinds[2]][1] );
vector nz( normals[vinds[0]][2], normals[vinds[1]][2], normals[vinds[2]][2] );
// Set depth interpolation through screen space interpolation
zABC = ptm * depth;
//Matrix for Model Space interpolation
matrix Q;
Q = ComputeRastMatrix(ppc, verts[vinds[0]], verts[vinds[1]], verts[vinds[2]]);
DEF = Q[0] + Q[1] + Q[2];
//Compute Model Space interpolation constants
SetModelRast(Q, nx, &nxABC);
SetModelRast(Q, ny, &nyABC);
SetModelRast(Q, nz, &nzABC);
//SetModelRast(Q, depth, &zABC);
if( renderMode == VCI ) {
// Setup screen space linear variation of color
rABC = ptm * red;
gABC = ptm * green;
bABC = ptm * blue;
}else if( renderMode == MCI ) {
// Set Color Model Space Constants
SetModelRast(Q, red, &rABC);
SetModelRast(Q, green, &gABC);
SetModelRast(Q, blue, &bABC);
}else if( renderMode == TM) {
//Get texture model space parameters
vector s( tcs[2*vinds[0]+0], tcs[2*vinds[1]+0], tcs[2*vinds[2]+0]);
vector t( tcs[2*vinds[0]+1], tcs[2*vinds[1]+1], tcs[2*vinds[2]+1]);
SetModelRast(Q, s, &sABC);
SetModelRast(Q, t, &tABC);
}
for( int v = top; v <= bottom; v++ ){
for ( int u = left; u <= right; u++ ) {
if(fb->IsOutsideFrame(u,v))
continue;
vector pv((float)u+0.5f, (float)v+0.5f, 1.0f);
//Check whether pixel is inside triangle
if (eeqs[0]*pv < 0.0f || eeqs[1]*pv < 0.0f || eeqs[2]*pv < 0.0f)
continue;
// Check whether triangle is closer than what was previously
// seen at this pixel
float currz = zABC * pv;
//currz /= (DEF * pv);
if (fb->IsFarther(u, v, currz))
continue;
fb->SetZ(u, v, currz);
// pixel is inside triangle and triangle is visible at pixel
// compute color of pixel based on current triangle
vector currColor;
if ( renderMode == SM)
continue;
if ( renderMode == VCI ){
currColor = vector( rABC * pv, gABC * pv, bABC * pv );
}else if ( renderMode == MCI ) {
float r = ModelInterpolation(u, v, rABC, DEF);
float g = ModelInterpolation(u, v, gABC, DEF);
float b = ModelInterpolation(u, v, bABC, DEF);
currColor = vector(r,g,b);
}
if ( renderMode == TM) {
int w = texture->w;
int h = texture->h;
float miS = ModelInterpolation(u, v, sABC, DEF);
float miT = ModelInterpolation(u, v, tABC, DEF);
miS = (miS * (float)w);
miT = (miT * (float)h);
int st = (h-1-(int)(miT)%h) * w+(int)(miS)%w;
if(st < 0 || st > h*w) continue;
currColor.SetFromColor(texture->pix[st]);
}
vector currNormal = vector(nxABC*pv/(DEF*pv), nyABC*pv/(DEF*pv), nzABC*pv/(DEF*pv)).norm();
if ( renderMode == RFL ) {
vector eye = ppc->C;
vector P = ppc->UnProject(pv);
vector ev = (eye - P);
vector rv = currNormal*(currNormal*ev)*2.0f - ev;
rv = rv.norm();
//currColor = (rv + vector(1.0f, 1.0f, 1.0f))/2.0f;
currColor.SetFromColor(cube->getColor(rv));
}
//Calculated Color at pixel using phong equation
for( int li = 0; li < lightsN; li++ ){
if(!L[li]->on)
continue;
vector fullColor;
fullColor.SetFromColor(color);
vector lv;
vector pp(pv);
pp[2] = currz;
lv = (L[li]->L->C - ppc->UnProject(pp)).norm();
float kd = lv * currNormal;
kd = (kd < 0.0f) ? 0.0f : kd;
//currColor = currColor * ka ;
//currColor = currColor * (ka + (1.0f-ka)*kd);
vector point = ppc->UnProject(pp);
vector SMp;
L[li]->L->Project(point, SMp);
float ul = SMp[0];
float vl = SMp[1];
if(L[li]->sm->IsOutsideFrame(ul, vl)) {
currColor = currColor * ka ;
//fb->Set(u,v, currColor.GetColor());
continue;
}
//Check depth from light to calculate shadows
float e = SMp[2]*.01;
if(L[li]->sm->IsFarther((int)ul, (int)vl, SMp[2]+e)) {
currColor = currColor * ka ;
//fb->Set(u,v, currColor.GetColor());
}else {
currColor *= ka +(1.0f-ka)*kd;
//fb->Set(u,v, currColor.GetColor());
}
}
fb->Set(u,v, currColor.GetColor());
}
}
}
delete []pverts;
}
