#define USE_FORGE_CPU_COPY_HELPERS
#include <complex>
#include <cmath>
const unsigned DIMX = 512;
const unsigned DIMY = 512;
struct Bitmap {
unsigned char *ptr;
unsigned width;
unsigned height;
};
Bitmap createBitmap(unsigned w, unsigned h);
void destroyBitmap(Bitmap& bmp);
void kernel(Bitmap& bmp);
int julia(int x, int y, int width, int height);
int main(void)
{
Bitmap bmp = createBitmap(DIMX, DIMY);
wnd.makeCurrent();
#ifdef OS_WIN
#else
#endif
wnd.setFont(&fnt);
kernel(bmp);
do {
wnd.draw(img);
} while(!wnd.close());
releaseGLBuffer(handle);
destroyBitmap(bmp);
return 0;
}
Bitmap createBitmap(unsigned w, unsigned h)
{
Bitmap retVal;
retVal.width = w;
retVal.height= h;
retVal.ptr = new unsigned char[4*w*h];
return retVal;
}
void destroyBitmap(Bitmap& bmp)
{
delete[] bmp.ptr;
}
void kernel(Bitmap& bmp)
{
for (unsigned y=0; y<bmp.height; ++y) {
for (unsigned x=0; x<bmp.width; ++x) {
int offset = x + y * bmp.width;
int juliaVal= julia(x, y, bmp.width, bmp.height);
bmp.ptr[offset*4 + 0] = 255 * juliaVal;
bmp.ptr[offset*4 + 1] = 0;
bmp.ptr[offset*4 + 2] = 0;
bmp.ptr[offset*4 + 3] = 255;
}
}
}
int julia(int x, int y, int width, int height)
{
const float scale = 1.5;
float jx = scale * (float)(width/2.0f - x)/(width/2.0f);
float jy = scale * (float)(height/2.0f - y)/(height/2.0f);
std::complex<float> c(-0.8f, 0.156f);
std::complex<float> a(jx, jy);
for (int i=0; i<200; i++) {
a = a * a + c;
if (abs(a) > 1000)
return 0;
}
return 1;
}