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77 lines
2.2 KiB
Plaintext
77 lines
2.2 KiB
Plaintext
2 years ago
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// Copyright (c) 2023 Lachlan McDonald
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// This work is licensed under the MIT License (MIT)
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// https://github.com/lachlanmcdonald/magicavoxel-shaders
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//
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// This script utilises or modifies code from other projects or publications.
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// Please see the attributions below for more information:
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//
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// 1. Copyright (c) 2020 ValgoBoi <https://github.com/ValgoBoi/clover-noise>
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// MIT License (MIT)
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// https://github.com/ValgoBoi/clover-noise/blob/master/LICENSE
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//
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// xs brush/grass [Direction] [Mode] [Density] [Growth] [Seed]
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//
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// xs_begin
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// author : '@lachlanmcdonald'
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// arg : { name = 'Direction' var = 'm_direction' range = '0 1' value = '0' step = '1' precision = '0' }
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// arg : { name = 'Mode' var = 'm_mode' range = '0 4' value = '0' step = '1' precision = '0' }
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// arg : { name = 'Density' var = 'm_density' range = '1 256' value = '2' step = '1' precision = '0' }
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// arg : { name = 'Growth' var = 'm_growth' range = '0 100' value = '50' step = '1' precision = '0' }
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// arg : { name = 'Seed' var = 'global_seed' range = '1 100' value = '1' step = '1' precision = '0' }
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// xs_end
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int direction = int(m_direction);
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int mode = int(m_mode);
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float density = m_density;
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float growth = mix(1.0, -1.0, m_growth / 100.0);
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float hash(vec2 p, float seed) {
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p += seed + global_seed;
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return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x))));
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}
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float hash(vec2 co) {
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return hash(co, 0.0);
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}
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float pal(float p) {
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float f = floor(mix(0.0, float(i_num_color_sels), p));
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return color_sel(f);
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}
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float map(vec3 v) {
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if (direction == 1) {
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v.z = i_volume_size.z - v.z;
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}
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vec2 cell = floor(vec2(v.xy) / density);
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vec3 local = floor(mod(v, density));
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vec2 placement = floor(vec2(hash(cell.xy), hash(cell.xy, 170.3170)) * density);
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if (all(equal(local.xy, placement))) {
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float height = hash(cell.yx, -170.3170);
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float z = v.z / i_volume_size.z;
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float p = 1.0 - sqrt(1.0 - pow(height, 2.0));
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float p2 = mix(height, p, growth);
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if (z < p2) {
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float f;
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if (mode == 0) {
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f = p2;
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} else if (mode == 1) {
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f = hash(vec2(z, p));
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} else if (mode == 2) {
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f = hash(v.xy);
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} else if (mode == 3) {
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f = z / p2;
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} else if (mode == 4) {
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f = 1.0 - (z / p2);
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}
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return pal(f);
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}
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}
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return 0.0;
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}
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