void drawPolygon( uint8_t _x0, uint8_t _y0,
uint8_t _x1, uint8_t _y1,
uint8_t _x2, uint8_t _y2,
uint8_t _x3, uint8_t _y3,
uint32_t _c) {
int rl[MAX_X_3D*2];
int j,i;
for (i=0;i<MAX_X_3D;++i) {
rl[2*i+0] = MAX_Y_3D+1;
rl[2*i+1] = -1;
}
rasterLine( _x0, _y0, _x1, _y1, rl );
rasterLine( _x1, _y1, _x2, _y2, rl );
rasterLine( _x2, _y2, _x3, _y3, rl );
rasterLine( _x3, _y3, _x0, _y0, rl );
for (i=0;i<MAX_X_3D;++i) {
if (rl[2*i+1]>rl[2*i+0]) {
for( j=rl[2*i+0]; j<=rl[2*i+1]; ++j ) {
frame[j*MAX_Y_3D+i]=_c;
}
}
}
}
void drawLine(FrameBuffer * colorBuff)
{
for (int i=0; i<(int)OBJ->numtriangles; ++i)
{
//cout << "tri:" << i << endl;
//if (tri[i].N.z < 0) continue; // backface
Vertex a(OBJ, OBJ->triangles[i].vindices[0]);
Vertex b(OBJ, OBJ->triangles[i].vindices[1]);
Vertex c(OBJ, OBJ->triangles[i].vindices[2]);
rasterLine(colorBuff, a, b);
rasterLine(colorBuff, a, c);
rasterLine(colorBuff, b, c);
}
}
int main(int argc, char **argv)
{
//printf("Num args is %d\n", argc);
if (argc < 7) {
printf("Usage: ras width height x0 y0 x1 y1\n");
exit(1);
}
int a[6];
int i;
for (i=0; i<6; i++) {
a[i] = atoi(argv[i+1]);
}
imageData idata = getNewImageData(a[0], a[1]);
rasterLine(idata, a[2], a[3], a[4], a[5]);
writeImage("out.png", idata);
cleanupImageData(idata);
return 0;
}
void rasterTriangle(FrameBuffer* buf, GLMtriangle t)
{
Vertex a(OBJ, t.vindices[0]);
Vertex b(OBJ, t.vindices[1]);
Vertex c(OBJ, t.vindices[2]);
if (b.pos.y > a.pos.y) swap(a, b);
if (c.pos.y > a.pos.y) swap(a, c);
if (c.pos.y > b.pos.y) swap(b, c);
Vector ab = b.pos-a.pos;
Vector bc = c.pos-b.pos;
Vector ca = a.pos-c.pos;
Vertex left, right;
GLfloat y, x1, x2;
GLfloat m1_inv, m2_inv;
left = a;
right = a;
x1 = a.pos.x;
x2 = a.pos.x;
y = a.pos.y;
if (ab.y == 0) // top
{
right = b;
x2 = b.pos.x;
m1_inv = ca.x/ca.y;
m2_inv = bc.x/bc.y;
rasterLine(buf, left, right);
y--;
while (y > c.pos.y)
{
x1=x1-m1_inv; x2=x2-m2_inv;
left = interpolate(a, c, x1, y);
right = interpolate(b, c, x2, y);
rasterLine(buf, left, right);
y--;
}
}
else if (bc.y == 0) // bottom
{
m1_inv = ab.x/ab.y;
m2_inv = ca.x/ca.y;
rasterLine(buf, left, right);
y--;
while (y > c.pos.y)
{
x1=x1-m1_inv; x2=x2-m2_inv;
left = interpolate(a, b, x1, y);
right = interpolate(c, a, x2, y);
rasterLine(buf, left, right);
y--;
}
}
else
{
m1_inv = ab.x/ab.y;
m2_inv = ca.x/ca.y;
rasterLine(buf, left, right);
y--;
while (y > b.pos.y)
{
x1=x1-m1_inv; x2=x2-m2_inv;
left = interpolate(a, b, x1, y);
right = interpolate(c, a, x2, y);
rasterLine(buf, left, right);
y--;
}
m1_inv = bc.x/bc.y;
y = b.pos.y;
x1 = b.pos.x;
x2 = a.pos.x + m2_inv*(y-a.pos.y);
left = b;
right = interpolate(c, a, x2, y);
rasterLine(buf, left, right);
y--;
while (y > c.pos.y)
{
x1=x1-m1_inv; x2=x2-m2_inv;
left = interpolate(b, c, x1, y);
right = interpolate(c, a, x2, y);
rasterLine(buf, left, right);
y--;
}
}
}
