51 lines
1.4 KiB
Zig
51 lines
1.4 KiB
Zig
const std = @import("std");
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const math = @import("math.zig");
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const vm = @import("vecmath");
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const Noise = struct {
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horizontal_scale: f32,
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value_median: f32,
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value_amplitude: f32,
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pub fn sample(self: Noise, seed: u64, pos: vm.Vector2) f32 {
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return math.noise2(seed, pos.divScalar(self.horizontal_scale)) * self.value_amplitude + self.value_median;
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}
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pub fn samplev(self: Noise, seed: u64, pos: vm.Vector2x8) vm.f32x8 {
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return math.noise2x8(seed, pos.divScalarSingle(self.horizontal_scale)) * vm.ps(self.value_amplitude) + vm.ps(self.value_median);
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}
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};
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const noise_main: Noise = .{
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.horizontal_scale = 80,
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.value_median = 7,
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.value_amplitude = 5,
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};
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const noise_secondary: Noise = .{
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.horizontal_scale = 15,
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.value_median = 0,
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.value_amplitude = 0.5,
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};
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pub fn heightF(seed: u64, pos: vm.Vector2) f32 {
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const main = noise_main.sample(seed, pos);
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const secondary = noise_secondary.sample(seed, pos);
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return @round(main + secondary);
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}
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pub fn heightFv(seed: u64, pos: vm.Vector2x8) vm.f32x8 {
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const main = noise_main.samplev(seed, pos);
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const secondary = noise_secondary.samplev(seed, pos);
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return @round(main + secondary);
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}
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pub fn heightI(seed: u64, pos: vm.Vector2) i32 {
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return @intFromFloat(heightF(seed, pos));
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}
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pub fn heightIv(seed: u64, pos: vm.Vector2x8) vm.i32x8 {
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return @intFromFloat(heightFv(seed, pos));
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}
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