54 lines
1.3 KiB
Plaintext
54 lines
1.3 KiB
Plaintext
#include <stdio.h>
|
|
#define blockIndex0 (blockIdx.x*4 + (threadIdx.x >> 5))
|
|
#define blockIndex1 (blockIdx.y)
|
|
#define vectorWidth (32)
|
|
#define vectorIndex (threadIdx.x & 31)
|
|
|
|
int __device__ __forceinline__
|
|
mandel(float c_re, float c_im, int count)
|
|
{
|
|
float z_re = c_re, z_im = c_im;
|
|
int i;
|
|
for (i = 0; i < count; ++i) {
|
|
if (z_re * z_re + z_im * z_im > 4.0f)
|
|
break;
|
|
|
|
float new_re = z_re*z_re - z_im*z_im;
|
|
float new_im = 2.0f * z_re * z_im;
|
|
{
|
|
z_re = c_re + new_re;
|
|
z_im = c_im + new_im;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
extern "C"
|
|
__global__ void mandelbrot_scanline(
|
|
float x0, float dx,
|
|
float y0, float dy,
|
|
int width, int height,
|
|
int xspan, int yspan,
|
|
int maxIterations, int output[])
|
|
{
|
|
const int xstart = blockIndex0 * xspan;
|
|
const int xend = min(xstart + xspan, width);
|
|
|
|
const int ystart = blockIndex1 * yspan;
|
|
const int yend = min(ystart + yspan, height);
|
|
|
|
for (int yi = ystart; yi < yend; yi++)
|
|
for (int xi = xstart; xi < xend; xi += vectorWidth)
|
|
{
|
|
const float x = x0 + (xi + vectorIndex) * dx;
|
|
const float y = y0 + yi * dy;
|
|
|
|
const int res = mandel(x,y,maxIterations);
|
|
const int index = yi * width + (xi + vectorIndex);
|
|
if (xi + vectorIndex < xend)
|
|
output[index] = res;
|
|
}
|
|
}
|
|
|