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update zig example

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This commit is contained in:
Dennis Ranke
2023-04-08 15:10:09 +02:00
parent d1b6fa36e8
commit 1a06ebbc95
2 changed files with 11 additions and 19 deletions
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12
examples/zig/main.zig
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@@ -1,11 +1,11 @@
extern fn atan2(x: f32, y: f32) f32;
extern fn time() f32;
pub const FRAMEBUFFER: *[320*240]u8 = @intToPtr(*[320*240]u8, 120);
pub const FRAMEBUFFER: *[320 * 240]u8 = @intToPtr(*[320 * 240]u8, 120);
export fn upd() void {
var i: u32 = 0;
while(true) {
while (true) {
var t = time() * 63.0;
var x = @intToFloat(f32, (@intCast(i32, i % 320) - 160));
var y = @intToFloat(f32, (@intCast(i32, i / 320) - 120));
@@ -13,8 +13,10 @@ export fn upd() void {
var u = atan2(x, y) * 512.0 / 3.141;
var c = @intCast(u8, (@floatToInt(i32, d + t * 2.0) ^ @floatToInt(i32, u + t)) & 255) >> 4;
FRAMEBUFFER[@as(usize, i)] = c;
FRAMEBUFFER[i] = c;
i += 1;
if(i >= 320*240) { break; }
if (i >= 320 * 240) {
break;
}
}
}
}