renamed dropdown ui control to select

the select option is now targeted in the user shader by a literal string value (preprocessed and converted to a uint)

Author: chrisj

src/annotation/type_handler.ts

@@ -629,7 +629,7 @@ if (ng_discardValue) {
       gl,
       shader,
       this.shaderControlState,
-      parameters.parseResult.controls,
+      parameters.parseResult,
     );
     gl.uniform3fv(shader.uniform("uSubspaceMatrix"), context.subspaceMatrix);
     gl.uniform1fv(shader.uniform("uModelClipBounds"), context.modelClipBounds);

src/layer/image/index.ts

@@ -448,7 +448,7 @@ export class ImageUserLayer extends Base {
           this.manager.root.display.gl,
           shader,
           this.shaderControlState,
-          shaderResult.parameters.parseResult.controls,
+          shaderResult.parameters.parseResult,
         );
       },
     };

src/single_mesh/frontend.ts

@@ -604,7 +604,7 @@ export class SingleMeshLayer extends PerspectiveViewRenderLayer<ThreeDimensional
       gl,
       shader,
       this.displayState.shaderControlState,
-      parameters.parseResult.controls,
+      parameters.parseResult,
     );
 
     const { pickIDs } = renderContext;

src/skeleton/frontend.ts

@@ -584,7 +584,7 @@ export class SkeletonLayer extends RefCounted {
       gl,
       edgeShader,
       shaderControlState,
-      edgeShaderParameters.parseResult.controls,
+      edgeShaderParameters.parseResult,
     );
     gl.uniform1f(edgeShader.uniform("uLineWidth"), lineWidth!);
 
@@ -595,7 +595,7 @@ export class SkeletonLayer extends RefCounted {
       gl,
       nodeShader,
       shaderControlState,
-      nodeShaderParameters.parseResult.controls,
+      nodeShaderParameters.parseResult,
     );
 
     const skeletons = source.chunks;

src/sliceview/volume/image_renderlayer.ts

@@ -143,7 +143,7 @@ export class ImageRenderLayer extends SliceViewVolumeRenderLayer<ShaderControlsB
       gl,
       shader,
       this.shaderControlState,
-      parameters.parseResult.controls,
+      parameters.parseResult,
     );
   }
 

src/volume_rendering/volume_render_layer.ts

@@ -908,7 +908,7 @@ outputValue = vec4(1.0, 1.0, 1.0, 1.0);
                 gl,
                 shader,
                 this.shaderControlState,
-                shaderResult.parameters.parseResult.controls,
+                shaderResult.parameters.parseResult,
               );
               this.bindDepthBufferTexture(renderContext, shader);
               chunkFormat.beginDrawing(gl, shader);
@@ -1078,7 +1078,7 @@ outputValue = vec4(1.0, 1.0, 1.0, 1.0);
                 gl,
                 shader,
                 this.shaderControlState,
-                shaderResult.parameters.parseResult.controls,
+                shaderResult.parameters.parseResult,
               );
               this.bindDepthBufferTexture(renderContext, shader);
               this.setShaderUniforms(shader, shaderSetupUniforms);

src/webgl/shader_source_preprocessing.ts

@@ -0,0 +1,42 @@
+/**
+ * @license
+ * Copyright 2026 Google Inc.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type ShaderStringLiteralIdMap = Map<string, number>;
+
+export interface ShaderSourcePreprocessingData {
+  stringLiteralIds: ShaderStringLiteralIdMap;
+}
+
+export interface ShaderStringPreprocessingResult {
+  code: string;
+  stringLiteralIds: ShaderStringLiteralIdMap;
+}
+
+export function preprocessStrings(
+  userShader: string,
+): ShaderStringPreprocessingResult {
+  const stringLiteralIds = new Map<string, number>();
+  const code = userShader.replace(/"(?:\\.|[^\\"])*"/g, (token) => {
+    const value = JSON.parse(token) as string;
+    let index = stringLiteralIds.get(value);
+    if (index === undefined) {
+      index = stringLiteralIds.size + 1;
+      stringLiteralIds.set(value, index);
+    }
+    return `${index}u`;
+  });
+  return { code, stringLiteralIds };
+}