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Implement M2 texture animation (UV scrolling) for fountain water

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Parse M2TextureTransform entries and texture transform lookups from the
M2 binary, then apply per-batch UV offsets in the vertex shader using
the existing animation time base and global sequence durations.
This commit is contained in:
Kelsi 2026-02-06 01:49:27 -08:00
parent 4bb2828b21
commit ad04da31c3
4 changed files with 83 additions and 1 deletions
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36
src/pipeline/m2_loader.cpp
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@ -210,6 +210,13 @@ struct CompressedQuat {
int16_t x, y, z, w;
};
// M2 texture transform (on-disk, 3 × M2TrackDisk = 60 bytes)
struct M2TextureTransformDisk {
M2TrackDisk translation; // 20
M2TrackDisk rotation; // 20
M2TrackDisk scaling; // 20
};
// M2 attachment point (on-disk)
struct M2AttachmentDisk {
uint32_t id;
@ -511,6 +518,35 @@ M2Model M2Loader::load(const std::vector<uint8_t>& m2Data) {
model.textureLookup = readArray<uint16_t>(m2Data, header.ofsTexLookup, header.nTexLookup);
}
// Read texture transforms (UV animation data)
if (header.nUVAnimation > 0 && header.ofsUVAnimation > 0) {
// Build per-sequence flags for skipping external .anim data
std::vector<uint32_t> seqFlags;
seqFlags.reserve(model.sequences.size());
for (const auto& seq : model.sequences) {
seqFlags.push_back(seq.flags);
}
model.textureTransforms.reserve(header.nUVAnimation);
for (uint32_t i = 0; i < header.nUVAnimation; i++) {
uint32_t ofs = header.ofsUVAnimation + i * sizeof(M2TextureTransformDisk);
if (ofs + sizeof(M2TextureTransformDisk) > m2Data.size()) break;
M2TextureTransformDisk dt = readValue<M2TextureTransformDisk>(m2Data, ofs);
M2TextureTransform tt;
parseAnimTrack(m2Data, dt.translation, tt.translation, TrackType::VEC3, seqFlags);
parseAnimTrack(m2Data, dt.rotation, tt.rotation, TrackType::QUAT_COMPRESSED, seqFlags);
parseAnimTrack(m2Data, dt.scaling, tt.scale, TrackType::VEC3, seqFlags);
model.textureTransforms.push_back(std::move(tt));
}
core::Logger::getInstance().debug(" Texture transforms: ", model.textureTransforms.size());
}
// Read texture transform lookup (nTransLookup)
if (header.nTransLookup > 0 && header.ofsTransLookup > 0) {
model.textureTransformLookup = readArray<uint16_t>(m2Data, header.ofsTransLookup, header.nTransLookup);
}
// Read attachment points
if (header.nAttachments > 0 && header.ofsAttachments > 0) {
auto diskAttachments = readArray<M2AttachmentDisk>(m2Data, header.ofsAttachments, header.nAttachments);