NodeBuilder - Fix Interpolation (#31222)

* init branch

* fix

* remove comment

* Update GLSLNodeBuilder.js

Clean up.

---------

Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>

examples/webgpu_centroid_sampling.html

@@ -158,8 +158,8 @@
 
 				};
 
-				const withFlatFirstShader = createShader( THREE.InterpolationSamplingType.FLAT, THREE.InterpolationSamplingMode.FLAT_FIRST );
-				const withFlatEitherShader = createShader( THREE.InterpolationSamplingType.FLAT, THREE.InterpolationSamplingMode.FLAT_EITHER );
+				const withFlatFirstShader = createShader( THREE.InterpolationSamplingType.FLAT, THREE.InterpolationSamplingMode.FIRST );
+				const withFlatEitherShader = createShader( THREE.InterpolationSamplingType.FLAT, THREE.InterpolationSamplingMode.EITHER );
 
 				const withSampleShader = Fn( () => {
 
@@ -235,16 +235,16 @@
 					THREE.InterpolationSamplingMode.NORMAL,
 					THREE.InterpolationSamplingMode.CENTROID,
 					THREE.InterpolationSamplingMode.SAMPLE,
-					THREE.InterpolationSamplingMode.FLAT_FIRST,
-					THREE.InterpolationSamplingMode.FLAT_EITHER
+					'flat first',
+					'flat either'
 				] ).onChange( () => {
 
 					const interpolationShaderLib = {
 						[ THREE.InterpolationSamplingMode.NORMAL ]: withoutInterpolationShader,
 						[ THREE.InterpolationSamplingMode.CENTROID ]: withInterpolationShader,
 						[ THREE.InterpolationSamplingMode.SAMPLE ]: withSampleShader,
-						[ THREE.InterpolationSamplingMode.FLAT_FIRST ]: withFlatFirstShader,
-						[ THREE.InterpolationSamplingMode.FLAT_EITHER ]: withFlatEitherShader
+						[ 'flat first' ]: withFlatFirstShader,
+						[ 'flat either' ]: withFlatEitherShader
 					};
 
 					const shader = interpolationShaderLib[ effectController.sampling ];

src/constants.js

@@ -1612,8 +1612,8 @@ export const InterpolationSamplingMode = {
 	NORMAL: 'normal',
 	CENTROID: 'centroid',
 	SAMPLE: 'sample',
-	FLAT_FIRST: 'flat first',
-	FLAT_EITHER: 'flat either'
+	FIRST: 'first',
+	EITHER: 'either'
 };
 
 /**

src/renderers/webgl-fallback/nodes/GLSLNodeBuilder.js

@@ -30,9 +30,7 @@ const interpolationTypeMap = {
 };
 
 const interpolationModeMap = {
-	'centroid': 'centroid',
-	'flat first': 'flat',
-	'flat either': 'flat'
+	'centroid': 'centroid'
 };
 
 const defaultPrecisions = `