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examples: speed up mandelbrot.v a little, increase iterations/details too

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Delyan Angelov 2022-06-09 20:10:00 +03:00
parent 922f003729
commit ea71ea3ec1
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1 changed files with 20 additions and 11 deletions
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31
examples/gg/mandelbrot.v
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@ -11,6 +11,8 @@ const chunk_height = 2 // the image is recalculated in chunks, each chunk proces
const zoom_factor = 1.1
const max_iterations = 255
struct ViewRect {
mut:
x_min f64
@ -33,12 +35,13 @@ mut:
iidx int
pixels &u32 = unsafe { vcalloc(pwidth * pheight * sizeof(u32)) }
npixels &u32 = unsafe { vcalloc(pwidth * pheight * sizeof(u32)) } // all drawing happens here, results are swapped at the end
view ViewRect = ViewRect{-2.7610033817025625, 1.1788897130338223, -1.824584023871934, 2.1153096311072788}
view ViewRect = ViewRect{-3.0773593290970673, 1.4952456603855397, -2.019938598189011, 2.3106642054225945}
scale int = 1
ntasks int = runtime.nr_jobs()
}
const colors = [gx.black, gx.blue, gx.red, gx.green, gx.yellow, gx.orange, gx.purple, gx.white,
gx.indigo, gx.violet, gx.black].map(u32(it.abgr8()))
gx.indigo, gx.violet, gx.black, gx.blue, gx.orange, gx.yellow, gx.green].map(u32(it.abgr8()))
struct MandelChunk {
cview ViewRect
@ -83,30 +86,35 @@ fn (mut state AppState) update() {
}
// everything is done, swap the buffer pointers
state.pixels, state.npixels = state.npixels, state.pixels
println('$state.ntasks threads; $sw.elapsed().milliseconds() ms / frame')
println('${state.ntasks:2} threads; ${sw.elapsed().milliseconds():3} ms / frame; scale: ${state.scale:4}')
oview = cview
}
}
[direct_array_access]
fn (mut state AppState) worker(id int, input chan MandelChunk, ready chan bool) {
for {
chunk := <-input or { break }
yscale := chunk.cview.height() / pheight
xscale := chunk.cview.width() / pwidth
mut x, mut y, mut iter := 0.0, 0.0, 0
mut y0 := chunk.ymin * yscale + chunk.cview.y_min
mut x0 := chunk.cview.x_min
for y_pixel := chunk.ymin; y_pixel < chunk.ymax && y_pixel < pheight; y_pixel++ {
y0 := y_pixel * yscale + chunk.cview.y_min
for x_pixel := 0.0; x_pixel < pwidth; x_pixel++ {
x0 := x_pixel * xscale + chunk.cview.x_min
mut x, mut y := x0, y0
mut iter := 0
for ; iter < 80; iter++ {
yrow := unsafe { &state.npixels[int(y_pixel * pwidth)] }
y0 += yscale
x0 = chunk.cview.x_min
for x_pixel := 0; x_pixel < pwidth; x_pixel++ {
x0 += xscale
x, y = x0, y0
for iter = 0; iter < max_iterations; iter++ {
x, y = x * x - y * y + x0, 2 * x * y + y0
if x * x + y * y > 4 {
break
}
}
unsafe {
state.npixels[int(y_pixel * pwidth) + int(x_pixel)] = colors[iter & 7]
yrow[x_pixel] = colors[iter & 15]
}
}
}
@ -128,6 +136,7 @@ fn (mut state AppState) zoom(zoom_factor f64) {
state.view.x_max = c_x + zoom_factor * d_x
state.view.y_min = c_y - zoom_factor * d_y
state.view.y_max = c_y + zoom_factor * d_y
state.scale += if zoom_factor < 1 { 1 } else { -1 }
}
fn (mut state AppState) center(s_x f64, s_y f64) {
@ -182,7 +191,7 @@ fn graphics_keydown(code gg.KeyCode, mod gg.Modifier, mut state AppState) {
// movement
mut d_x, mut d_y := 0.0, 0.0
if code == .enter {
println('> $state.view.x_min | $state.view.x_max | $state.view.y_min | $state.view.y_max')
println('> ViewRect{$state.view.x_min, $state.view.x_max, $state.view.y_min, $state.view.y_max}')
}
if state.gg.pressed_keys[int(gg.KeyCode.left)] {
d_x -= s_x