// Render a mandelbrot fractal onto the given sdl surface
func Mandelbrot(state *FractalData, screen *sdl.Surface, pal []uint32) {
fmt.Println("Beginning Mandelbrot")
var wg sync.WaitGroup
aspect := state.FractalState.Aspect()
xincr, yincr := state.FractalState.Increments()
y_cur := imag(state.Center) + (state.Scale/aspect)/2.0
wg.Add(state.Height)
for y := 0; y < state.Height; y++ {
x_cur := real(state.Center) - state.Scale/2.0
go mandelbrot_row(x_cur, y_cur, xincr, y, state, &wg)
y_cur -= yincr
}
wg.Wait()
fmt.Println("Rendering mandelbrot")
screen.Lock()
defer screen.Unlock()
wg.Add(state.Height)
offset := uintptr(unsafe.Pointer(screen.Pixels))
delta := uintptr(screen.Pitch / 1)
for y := 0; y < state.Height; y++ {
go renderRow(offset, y, state, pal, &wg)
offset += delta
}
wg.Wait()
//invocations++
fmt.Println("Mandeblrot completed")
}
