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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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6
include/rendering/m2_renderer.hpp
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@ -31,6 +31,7 @@ struct M2ModelGPU {
uint32_t indexStart = 0; // offset in indices (not bytes)
uint32_t indexCount = 0;
bool hasAlpha = false;
uint16_t textureAnimIndex = 0xFFFF; // 0xFFFF = no texture animation
};
GLuint vao = 0;
@ -61,6 +62,11 @@ struct M2ModelGPU {
bool hasAnimation = false; // True if any bone has keyframes
bool isSmoke = false; // True for smoke models (UV scroll animation)
bool disableAnimation = false; // Keep foliage/tree doodads visually stable
bool hasTextureAnimation = false; // True if any batch has UV animation
// Texture transform data for UV animation
std::vector<pipeline::M2TextureTransform> textureTransforms;
std::vector<uint16_t> textureTransformLookup;
std::vector<int> idleVariationIndices; // Sequence indices for idle variations (animId 0)
bool isValid() const { return vao != 0 && indexCount > 0; }