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63bfaf545e
Every glitter brick had the same flecks in the same places: the UVs were the vertex positions projected on an axis plane, so bricks a whole tile apart (and every brick of the same shape at the same spot in its own model) looked identical. Each brick now has a number of its own (UgcGlitter::BrickSeed, from the model's id and the brick's index, kept per vertex in Mesh::brickSeeds) that turns the projection by an angle and moves it by an offset under a tile, differently for each axis plane. A model made again gets the same patterns; every LOD of a brick the same one. The icon now draws the flecks on the UVs the .nif has (Mesh::uvs read back by FromNif). New setting glitter_random (1; 0 puts the same pattern on every brick as before). Non-glitter models are byte-identical (hash tests unchanged). Check in game: reprocess a model with several glitter bricks of the same shape; the fleck patterns differ from brick to brick. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
49 lines
2.5 KiB
C++
49 lines
2.5 KiB
C++
#pragma once
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#include <cstdint>
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#include <vector>
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#include <glm/glm.hpp>
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/**
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* The glitter the UGC server gives glitter colors (docs/UgcServer.md, "Metal and glow"): a tileable texture of white
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* flecks (its alpha) laid over the brick's color by the client's LEGO-AnimUV shader (lerp(vertex color, texture,
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* texture alpha), then the LEGO lighting), on UVs projected from the model's own coordinates so every brick gets the
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* same density, turned and moved by a number of each brick's own (BrickSeed) so no two bricks have the same pattern,
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* drifting as the texture transform's translation loops. Pure.
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*/
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namespace UgcGlitter {
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// The texture's side in pixels (a power of two, mipmapped down to 1)
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constexpr int TEXTURE_SIZE = 128;
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struct Params {
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float tile{ 1.6f }; // glitter_size: the texture's side in model units (LDD units: a stud is 0.8)
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uint32_t flecks{ 50 }; // glitter_density: flecks in one tile
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float speed{ 1.0f }; // glitter_speed: 1 moves the flecks a tile in U in 7 s and in V in 11 s; 0 keeps them still
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bool random{ true }; // glitter_random: each brick its own pattern (BrickSeed), else the same on every brick
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// Seconds the texture's translation takes to go one tile in U and in V (0: no animation)
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float PeriodU() const { return speed > 0.0f ? 7.0f / speed : 0.0f; }
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float PeriodV() const { return speed > 0.0f ? 11.0f / speed : 0.0f; }
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bool operator==(const Params&) const = default;
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};
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// The texture's alpha (TEXTURE_SIZE squared, rows top to bottom): `flecks` soft dots at the same places every time,
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// wrapping around the edges so the texture tiles. Its color is white.
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std::vector<uint8_t> FleckAlpha(uint32_t flecks);
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// The texture's mipmaps' alpha, from TEXTURE_SIZE down to 1 (each the mean of 2x2 of the one before)
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std::vector<std::vector<uint8_t>> Mipmaps(const std::vector<uint8_t>& alpha);
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// A brick's number for placing its glitter (never 0), from the model's seed and the brick's index: the same for
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// the brick in every LOD and every time the model is made
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uint32_t BrickSeed(uint64_t modelSeed, uint32_t brick);
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// A vertex's UV: its position on the axis plane its normal faces most, in tiles, turned by an angle and moved by
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// an offset (under a tile) that `seed` (the brick's BrickSeed) picks for each plane; seed 0 leaves it as it is
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glm::vec2 Uv(const glm::vec3& position, const glm::vec3& normal, float tile, uint32_t seed = 0);
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// The texture's alpha (0..1) at `uv` (wrapping, bilinear)
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float Sample(const std::vector<uint8_t>& alpha, const glm::vec2& uv);
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}
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