You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
888 B
C
36 lines
888 B
C
2 years ago
|
__kernel void mandelbrot_calc(const __global double2 *c_pt,
|
||
|
|
__global unsigned int *out_it,
|
||
|
|
const unsigned int max_iterations)
|
||
|
|
{
|
||
|
|
const int id = get_global_id(0);
|
||
|
|
const double2 opt = c_pt[id];
|
||
|
|
|
||
|
|
double2 pt = opt;
|
||
|
|
double tmp = pt.x * pt.y;
|
||
|
|
unsigned int iterations = 0;
|
||
|
|
|
||
|
|
double q = (pt.x - 0.25) * (pt.x - 0.25) + pt.y * pt.y;
|
||
|
|
if (q * (q + (pt.x - 0.25)) <= 0.25 * pt.y * pt.y)
|
||
|
|
iterations = max_iterations;
|
||
|
|
|
||
|
|
while (iterations < max_iterations) {
|
||
|
|
pt *= pt;
|
||
|
|
|
||
|
|
if (pt.x + pt.y > 4.0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
pt.x = pt.x - pt.y;
|
||
|
|
pt.y = 2 * tmp;
|
||
|
|
pt += opt;
|
||
|
|
tmp = pt.x * pt.y;
|
||
|
|
|
||
|
|
++iterations;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (iterations == max_iterations)
|
||
|
|
out_it[id] = 0;
|
||
|
|
else
|
||
|
|
out_it[id] = ((iterations & 0xFF) << 16) | ((iterations & 0x07) << 6);
|
||
|
|
}
|
||
|
|
|