fix(aggregation-layers): init geometry.uv in Heatmap/ScreenGrid fragment shaders (#10300)

[sergey-sotnikov]

Closes #10300

Background

HeatmapLayer and ScreenGridLayer fail to compile their fragment shaders on Chrome/Android with Adreno GPUs ("Fragment shader is not compiled", empty info log) — see #10300. Works in Firefox (non-ANGLE) and on desktop.

Root cause: weights-fs.glsl.ts and screen-grid-layer-fragment.glsl.ts call DECKGL_FILTER_COLOR(color, geometry) but never initialize the global geometry (FragmentGeometry). Every other layer fragment sets geometry.uv = ... before the hook call (see column-layer / solid-polygon-layer). Passing an uninitialized struct into a function is translated by ANGLE into code the Adreno driver's compiler silently rejects (chrome://gpu shows the dontInitializeUninitializedLocals Adreno workaround active).

Tested on Xiaomi Redmi Note 13 (Adreno 710), Chrome + Brave.

Change List

• HeatmapLayer: init geometry.uv = vec2(0.); at the top of main() in weights-fs.glsl.ts
• ScreenGridLayer: init geometry.uv = vec2(0.); at the top of main() in screen-grid-layer-fragment.glsl.ts

[chrisgervang]

Was this actually confirmed to fix the compile error on the reported Adreno device, or only inferred from the vertex-shader init pattern?

We have existing render golden-image tests covering both layers (test/render/test-cases/heatmap-layer.js, test/render/test-cases/screen-grid-layer.js), including gpuAggregation: true/false paths for ScreenGridLayer. These should catch any accidental visual regression from this change.. they still pass on my system, but I cannot test on Adreno.

Could you please run them (or an a similar test) on your Adreno device and provide screenshots of the before and after?

The big risk when accepting these device-specific changes are that they may fix this device, but may break another. The programming pattern is also not standardized across the project, so it's possible for a regression to occur and we don't have the ability to catch it.

[coveralls]

coverage: 83.166%. remained the same — sergey-sotnikov:patch-1 into visgl:master