diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 69 |
1 files changed, 54 insertions, 15 deletions
@@ -300,7 +300,7 @@ triangle(Memimage *dst, Point p0, Point p1, Point p2, Memimage *src) bresenham(dst, t[0], t[1], src); bresenham(dst, t[1], t[2], src); - bresenham(dst, t[2], t[0], green); + bresenham(dst, t[2], t[0], src); } void @@ -339,7 +339,8 @@ filltriangle2(Memimage *dst, Triangle3 st, Triangle3 nt, Triangle2 tt, double in Point p, tp; Triangle2 st₂, tt₂; Point3 bc; - double z; + static Point3 light = {0,0,-1,0}; /* global light field */ + double z, intens[3]; uchar cbuf[4]; bbox = Rect( @@ -357,6 +358,14 @@ filltriangle2(Memimage *dst, Triangle3 st, Triangle3 nt, Triangle2 tt, double in if(bc.x < 0 || bc.y < 0 || bc.z < 0) continue; + intens[0] = dotvec3(nt.p0, light); + intens[1] = dotvec3(nt.p1, light); + intens[2] = dotvec3(nt.p2, light); + intensity = intens[0]*bc.x + intens[1]*bc.y + intens[2]*bc.z; + /* back-face culling */ + if(intensity <= 0) + continue; + z = st.p0.z*bc.x + st.p1.z*bc.y + st.p2.z*bc.z; lock(&zbuflk); if(z <= zbuf[p.x + p.y*Dx(dst->r)]){ @@ -460,9 +469,10 @@ shaderunit2(void *arg) Triangle3 t, st, nt; /* world-, screen-space and normals triangles */ Triangle2 tt; /* texture triangle */ Point3 n; /* surface normal */ - static Point3 light = {0,0,-1,0}; /* global light field */ - double intensity; - Point3 np0, np1; +// static Point3 light = {0,0,-1,0}; /* global light field */ +// double intensity, intens[3]; + Point3 np0, np1, bc; + Triangle2 st₂; params = arg; sp.frag = rgb(DBlack); @@ -480,6 +490,10 @@ shaderunit2(void *arg) t.p1 = Pt3(verts[idxtab->indices[1]].x,verts[idxtab->indices[1]].y,verts[idxtab->indices[1]].z,verts[idxtab->indices[1]].w); t.p2 = Pt3(verts[idxtab->indices[2]].x,verts[idxtab->indices[2]].y,verts[idxtab->indices[2]].z,verts[idxtab->indices[2]].w); + t.p0 = xform3(t.p0, rota); + t.p1 = xform3(t.p1, rota); + t.p2 = xform3(t.p2, rota); + st.p0 = xform3(t.p0, view); st.p1 = xform3(t.p1, view); st.p2 = xform3(t.p2, view); @@ -487,21 +501,47 @@ shaderunit2(void *arg) st.p1 = divpt3(st.p1, st.p1.w); st.p2 = divpt3(st.p2, st.p2.w); - n = normvec3(crossvec3(subpt3(t.p2, t.p0), subpt3(t.p1, t.p0))); - intensity = dotvec3(n, light); - /* back-face culling */ - if(intensity <= 0) - continue; +// n = normvec3(crossvec3(subpt3(t.p2, t.p0), subpt3(t.p1, t.p0))); +// intensity = dotvec3(n, light); +// /* back-face culling */ +// if(intensity <= 0) +// continue; - np0 = centroid3(st); - np1 = addpt3(np0, mulpt3(n, 10)); - bresenham(nfb, Pt(np0.x,np0.y), Pt(np1.x,np1.y), green); +// np0 = centroid3(st); +// np1 = addpt3(np0, mulpt3(n, 50)); +// bresenham(nfb, Pt(np0.x,np0.y), Pt(np1.x,np1.y), memwhite); idxtab = &(*ep)->indextab[OBJVNormal]; if(modeltex != nil && idxtab->nindex == 3){ nt.p0 = Vec3(nverts[idxtab->indices[0]].i, nverts[idxtab->indices[0]].j, nverts[idxtab->indices[0]].k); nt.p1 = Vec3(nverts[idxtab->indices[1]].i, nverts[idxtab->indices[1]].j, nverts[idxtab->indices[1]].k); nt.p2 = Vec3(nverts[idxtab->indices[2]].i, nverts[idxtab->indices[2]].j, nverts[idxtab->indices[2]].k); + nt.p0 = normvec3(nt.p0); nt.p0.z *= -1; + nt.p1 = normvec3(nt.p1); nt.p1.z *= -1; + nt.p2 = normvec3(nt.p2); nt.p2.z *= -1; +// nt.p0 = mulpt3(normvec3(nt.p0), -1); +// nt.p1 = mulpt3(normvec3(nt.p1), -1); +// nt.p2 = mulpt3(normvec3(nt.p2), -1); +// intens[0] = dotvec3(nt.p0, light); +// intens[1] = dotvec3(nt.p1, light); +// intens[2] = dotvec3(nt.p2, light); + + st₂.p0 = Pt2(st.p0.x, st.p0.y, 1); + st₂.p1 = Pt2(st.p1.x, st.p1.y, 1); + st₂.p2 = Pt2(st.p2.x, st.p2.y, 1); + bc = barycoords(st₂, centroid(st₂)); + np0 = centroid3(st); + np1 = Vec3( + nt.p0.x*bc.x + nt.p1.x*bc.y + nt.p2.x*bc.z, + nt.p0.y*bc.x + nt.p1.y*bc.y + nt.p2.y*bc.z, + nt.p0.z*bc.x + nt.p1.z*bc.y + nt.p2.z*bc.z); +// intensity = intens[0]*bc.x + intens[1]*bc.y + intens[2]*bc.z; +// /* back-face culling */ +// if(intensity <= 0) +// continue; + np1 = addpt3(np0, mulpt3(np1, 50)); + triangle(nfb, Pt(st.p0.x,st.p0.y), Pt(st.p1.x,st.p1.y), Pt(st.p2.x,st.p2.y), red); + bresenham(nfb, Pt(np0.x,np0.y), Pt(np1.x,np1.y), green); }else memset(&nt, 0, sizeof nt); @@ -513,7 +553,7 @@ shaderunit2(void *arg) }else memset(&tt, 0, sizeof tt); - filltriangle2(params->dst, st, nt, tt, intensity, sp.frag); + filltriangle2(params->dst, st, nt, tt, 0, sp.frag); } freememimage(sp.frag); @@ -960,7 +1000,6 @@ threadmain(int argc, char *argv[]) }; identity3(rota); mulm3(rota, yrot); - mulm3(proj, rota); mulm3(view, proj); rendering = 1; proccreate(renderer, nil, mainstacksize); |