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Parse M2 render flags and apply per-batch blend modes

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Water/lava batches in fountain and Ironforge M2 models use non-opaque
blend modes (alpha, additive) defined in the M2 material table. Without
parsing these, they rendered as solid surfaces extending visibly beyond
their containers. Now each batch looks up its blend mode from the
material array and sets the appropriate GL blend function.
This commit is contained in:
Kelsi 2026-02-06 01:54:25 -08:00
parent ad04da31c3
commit 4d80b92c39
4 changed files with 76 additions and 1 deletions
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7
include/pipeline/m2_loader.hpp
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@ -109,6 +109,12 @@ struct M2Batch {
uint16_t submeshLevel = 0; // Submesh level (0=base, 1+=LOD/alternate mesh)
};
// Material / render flags (per-batch blend mode)
struct M2Material {
uint16_t flags; // Render flags (unlit, unfogged, two-sided, etc.)
uint16_t blendMode; // 0=Opaque, 1=AlphaKey, 2=Alpha, 3=Add, 4=Mod, 5=Mod2x, 6=BlendAdd, 7=Screen
};
// Texture transform (UV animation) data
struct M2TextureTransform {
M2AnimationTrack translation; // UV translation keyframes
@ -145,6 +151,7 @@ struct M2Model {
std::vector<M2Batch> batches;
std::vector<M2Texture> textures;
std::vector<uint16_t> textureLookup; // Batch texture index lookup
std::vector<M2Material> materials; // Render flags / blend modes
// Texture transforms (UV animation)
std::vector<M2TextureTransform> textureTransforms;