Fix for failing unit test

GitOrigin-RevId: bc3e7e3de55005e77d067ec788e2d94a9d48daa3

Author: dcoj

modules/hd_main_esm.ts

@@ -1,14 +1,18 @@
 import {warnOnce} from '../src/util/util';
 import {updateFrcCoverageFadeRange} from '../3d-style/style/frc_coverage_eager';
+import {buildElevationRequestParams} from '../3d-style/source/elevation_coverage_snapshot';
 
 import type {HD as HDType} from './hd_main_imports';
 
 // `updateFrcCoverageFadeRange` is pure config-walking — it must run before the first
 // tile request to set `painter.frcCoverageFadeRange` (read by `vector_tile_source`
 // when building worker tile params). Importing it statically pulls it into core.
+// `buildElevationRequestParams` is likewise needed before the first tile load so that
+// cross-source elevation stubs are generated even when the full HD chunk hasn't loaded yet.
 // Rest of HD stays lazy.
 export const HD: Partial<typeof HDType> = {
     updateFrcCoverageFadeRange,
+    buildElevationRequestParams,
 };
 
 export async function prepareHD() {

src/source/vector_tile_source.ts

@@ -346,8 +346,9 @@ class VectorTileSource extends Evented<SourceEvents> implements ISource<'vector'
 
         // Enable cross-source elevation while HD is loading so unmatched ids defer (not parse flat).
         // Inert on non-elevation styles (no hd-road-markup buckets).
+        const crossSourceElevationActive = !!(this.map.style && this.map.style._crossSourceElevationActive);
         const crossSourceElevationEnabled = !!(this.map.style &&
-            (this.map.style._crossSourceElevationActive || !HD.loaded));
+            (crossSourceElevationActive || !HD.loaded));
 
         const params: WorkerSourceVectorTileRequest = {
             request,
@@ -391,7 +392,7 @@ class VectorTileSource extends Evented<SourceEvents> implements ISource<'vector'
             terrainEnabled: !!(this.map.style && this.map.style.terrain),
             crossSourceElevationEnabled,
             elevation: HD.buildElevationRequestParams ?
-                HD.buildElevationRequestParams(this.map, tile, crossSourceElevationEnabled) : null,
+                HD.buildElevationRequestParams(this.map, tile, crossSourceElevationActive) : null,
             brightness: this.map.style ? (this.map.style.getBrightness() || 0.0) : 0.0,
             extraShadowCaster: tile.isExtraShadowCaster,
             tessellationStep: this.map._tessellationStep,

test/unit/source/elevation_coverage.test.ts

@@ -796,9 +796,9 @@ describe('HD elevation eager/lazy split (hd_main_esm)', () => {
         const {HD, prepareHD} = mod;
 
         expect(typeof HD.updateFrcCoverageFadeRange).toBe('function');
+        expect(typeof HD.buildElevationRequestParams).toBe('function');
         expect(HD.loaded).toBeFalsy();
         expect(HD.setupAndUpdateElevationCoverage).toBeUndefined();
-        expect(HD.buildElevationRequestParams).toBeUndefined();
         expect(HD.HdElevationState).toBeUndefined();
         expect(HD.updateElevationCoverage).toBeUndefined();
         expect(HD.updateHdElevationSourceCache).toBeUndefined();