bool KDTree::rayintersectsbox(FSBoundingBox *box)
{
double pmin, pmax, tmin, tmax;
double dtemp;
// Get the parametric distance along each direction from the min point to
// the min and max box planes. If the min dist is grater than the max
// dist, we have to swap them. Keep a running total of the max min and the
// min max. The ray intersects the box iff tmin <= tmax and tmax >= 0.0.
// Otherwise, the ray misses the box or points away from the box (with the
// starting point outside).
tmin = (box->xmin - rayxstart)/dx;
tmax = (box->xmax - rayxstart)/dx;
if ( tmin > tmax ) {
dtemp = tmin; tmin = tmax; tmax = dtemp;
}
pmin = (box->ymin - rayystart)/dy;
pmax = (box->ymax - rayystart)/dy;
if ( pmin > pmax ) {
dtemp = pmin; pmin = pmax; pmax = dtemp;
}
tmin = MAXX(pmin,tmin);
tmax = MINN(pmax,tmax);
if ( tmin > tmax ) return false;
pmin = (box->zmin - rayzstart)/dz;
pmax = (box->zmax - rayzstart)/dz;
if ( pmin > pmax ) {
dtemp = pmin; pmin = pmax; pmax = dtemp;
}
tmin = MAXX(pmin,tmin);
tmax = MINN(pmax,tmax);
if ( (tmax < 0.0) || (tmin > tmax) ) return false;
return true;
}
void data_cl_realloc(framebuffer_t *fb, size_t buffer_size)
{
cl_int ret;
size_t orig_as, new_as;
ret = clFinish(fb->clctx.command_queue);
CL_ERR_NORET("clFinish in data_cl_realloc()", ret);
// free CL buffer
ret = clReleaseMemObject(fb->data_cl);
CL_ERR_NORET("clReleaseMemObject (in data_cl_realloc, for fb->data_cl)", ret);
// Calculate the new allocation size
orig_as = new_as = fb->data_cl_as;
do
{
new_as += (1LL << log2_ffo64(fb->data_cl_as+buffer_size) - (fb->data_cl_as+buffer_size > 200<<20 ? 3 : 2)); // Increment by 33%-50% or 17%-25% above 200 MB
}
while (new_as < fb->data_cl_as + buffer_size);
// Allocate the CL buffer and shrink it if needed
do
{
fb->data_cl = clCreateBuffer(fb->clctx.context, CL_MEM_READ_WRITE, new_as, NULL, &ret);
if (ret != CL_SUCCESS) // if it's too much
new_as -= 8 << 20; // remove 8 MB
}
while (ret != CL_SUCCESS);
if (new_as < fb->data_cl_as)
fprintf_rl(stderr, "data_cl_realloc() made fb->data_cl smaller, %g MB to %g MB\n", (double) fb->data_cl_as / sq(1024.), (double) new_as / sq(1024.));
// Resize the local buffer and copy it back
alloc_enough(&fb->data, new_as, &fb->data_cl_as, 1, 1.);
fb->data_cl_as = new_as;
cl_copy_buffer_to_device(*fb, fb->data, 0, MINN(orig_as, fb->data_cl_as)); // enqueue copy of everything
//fprintf_rl(stdout, "data_cl resized to %g MB\n", (double) fb->data_cl_as / sq(1024.));
}
int InsidePolygon(GLfloat x, GLfloat y, int N, GLfloat* polygon)
{
int counter = 0;
int i;
GLfloat xinters;
//Point p1,p2;
GLfloat x1, y1, x2, y2;
x1 = polygon[0];
y1 = polygon[1];
for (i=1;i<=N;i++) {
x2 = polygon[2*(i % N)];
y2 = polygon[2*(i % N)+1];
if (y > MINN(y1,y2)) {
if (y <= MAXX(y1,y2)) {
if (x <= MAXX(x1,x2)) {
if ( fabs(y1 - y2) > 1e-8 ) {
xinters = (y-y1)*(x2-x1)/(y2-y1)+x1;
if ( fabs(x1 - x2)<1e-8 || x <= xinters)
counter++;
}
}
}
}
x1 = x2;
y1 = y2;
}
return (counter %2 != 0);
/*
if (counter % 2 == 0)
return(OUTSIDE);
else
return(INSIDE);*/
}