feat(layers) Port ColumnLayer to WebGPU

[ibgreen]

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[chatgpt-codex-connector]

💡 Codex Review

deck.gl/modules/layers/src/column-layer/column-layer.ts

Line 242 in 7dedee7

modules: [project32, flatShading ? phongMaterial : gouraudMaterial, picking, columnUniforms]

Load the WGSL color module for ColumnLayer

In WebGPU, this layer now assembles column-layer.wgsl.ts, but that shader reads color.opacity and calls deckgl_premultiplied_alpha while getShaders() only registers project32, the material module, picking, and columnUniforms. Because no color WGSL source is included, the assembled shader has no color symbol or premultiplied-alpha helper, so creating a ColumnLayer (and therefore GridCellLayer, which subclasses it) on WebGPU fails at shader compilation time.

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[coveralls]

coverage: 91.096% (+0.03%) from 91.066%
when pulling 7dedee7 on ib/webgpu-column-layer
into e61bc7d on master.

[felixpalmer]

Seems like a lot of repeated code, compared to the much more limited #define blocks in the GLSL

[felixpalmer]

Instead use string interpolation?