From 948dc7b9e711177c0d01507d0a1b62009f1c344d Mon Sep 17 00:00:00 2001
From: willjnz <will.jones@hotmail.co.nz>
Date: Tue, 25 Aug 2026 11:11:20 +1000
Subject: [PATCH] Allow MultiCOGLayer sampler to be overridden

---
 .../deck.gl-geotiff/src/multi-cog-layer.ts    | 33 ++++++++++++++++---
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/packages/deck.gl-geotiff/src/multi-cog-layer.ts b/packages/deck.gl-geotiff/src/multi-cog-layer.ts
index 7b50a574..eba5c1fb 100644
--- a/packages/deck.gl-geotiff/src/multi-cog-layer.ts
+++ b/packages/deck.gl-geotiff/src/multi-cog-layer.ts
@@ -48,7 +48,7 @@ import {
   metersPerUnit,
   parseWkt,
 } from "@developmentseed/proj";
-import type { Device, TextureFormat } from "@luma.gl/core";
+import type { Device, SamplerProps, TextureFormat } from "@luma.gl/core";
 import { Texture } from "@luma.gl/core";
 import proj4 from "proj4";
 import { DEFAULT_CONCURRENCY_LIMITER } from "./default-concurrency-limiter.js";
@@ -185,6 +185,17 @@ export type MultiCOGLayerProps = CompositeLayerProps &
      */
     renderPipeline?: RasterModule[];
 
+    /**
+     * Sampler used for each band's GPU texture.
+     *
+     * Linear blends real data with nodata/out-of-bounds fill at mask, tile,
+     * and dataset edges. Use nearest to avoid that blending, at the cost of
+     * blocky pixels when zoomed in past native resolution.
+     *
+     * @default { minFilter: "linear", magFilter: "linear" }
+     */
+    bandSampler?: SamplerProps;
+
     /**
      * EPSG code resolver used to look up projection definitions for numeric
      * CRS codes found in GeoTIFF metadata.
@@ -725,7 +736,11 @@ export class MultiCOGLayer extends RasterTileLayer<
       signal,
     });
 
-    const texture = createBandTexture(device, tile.array);
+    const texture = createBandTexture(
+      device,
+      tile.array,
+      this.props.bandSampler,
+    );
     const arr = tile.array;
     const byteLength =
       arr.layout === "pixel-interleaved"
@@ -832,7 +847,11 @@ export class MultiCOGLayer extends RasterTileLayer<
       minRow: resolution.minRow,
     });
 
-    const texture = createBandTexture(device, assembled);
+    const texture = createBandTexture(
+      device,
+      assembled,
+      this.props.bandSampler,
+    );
     const assembledByteLength =
       assembled.layout === "pixel-interleaved"
         ? assembled.data.byteLength
@@ -1024,7 +1043,11 @@ function selectImage(geotiff: GeoTIFF, z: number): GeoTIFF | Overview {
  *
  * TODO: use `inferTextureFormat` from `texture.ts` for full format support.
  */
-function createBandTexture(device: Device, array: RasterArray): Texture {
+function createBandTexture(
+  device: Device,
+  array: RasterArray,
+  sampler: SamplerProps = { minFilter: "linear", magFilter: "linear" },
+): Texture {
   if (array.layout !== "pixel-interleaved") {
     throw new Error("Band-separate layout not yet supported in MultiCOGLayer");
   }
@@ -1048,7 +1071,7 @@ function createBandTexture(device: Device, array: RasterArray): Texture {
     format,
     width,
     height,
-    sampler: { minFilter: "linear", magFilter: "linear" },
+    sampler,
   });
 }