fix: base color index problem

Walkthrough

The changes in loader-impl.ts adjust the calculation of texture indexes in the TextureManager class. Specifically, the addTexture and getTexture methods now use a modified index when the isBaseColor flag is true, ensuring that the textures are uniquely and correctly identified within the manager.

Changes

File	Change Summary
`plugin-packages/.../gltf/loader-impl.ts`	Updated `TextureManager`'s `addTexture` and `getTexture` methods to include `(matIndex + 1)` in the index calculation when `isBaseColor` is true.

Sequence Diagram

sequenceDiagram
    participant User
    participant TextureManager

    User->>TextureManager: call addTexture(matIndex, texIndex, tex, isBaseColor)
    TextureManager->>TextureManager: calculate index
    TextureManager-->>User: add texture

    User->>TextureManager: call getTexture(matIndex, texIndex, isBaseColor)
    TextureManager->>TextureManager: calculate index
    TextureManager-->>User: return texture

Poem

In the code where textures align,
A tweak to keep them in line,
With base color's embrace,
Indexes find their place,
Now textures shine, divine!
🖼️✨

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galacean / effects-runtime