TSL: Fix coordinate types for `load()` on 3D texture nodes (#31775)

* Fix incorrect coordinate types for load()

* Fix null level, align the order of parameters with generateTexture

src/nodes/accessors/CubeTextureNode.js

@@ -123,7 +123,7 @@ class CubeTextureNode extends TextureNode {
 	 */
 	generateUV( builder, cubeUV ) {
 
-		return cubeUV.build( builder, 'vec3' );
+		return cubeUV.build( builder, this.sampler === true ? 'vec3' : 'ivec3' );
 
 	}
 

src/nodes/accessors/Texture3DNode.js

@@ -153,7 +153,7 @@ class Texture3DNode extends TextureNode {
 	 */
 	generateUV( builder, uvNode ) {
 
-		return uvNode.build( builder, 'vec3' );
+		return uvNode.build( builder, this.sampler === true ? 'vec3' : 'ivec3' );
 
 	}
 

src/nodes/accessors/TextureNode.js

@@ -423,11 +423,7 @@ class TextureNode extends UniformNode {
 
 		let snippet;
 
-		if ( levelSnippet ) {
-
-			snippet = builder.generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, offsetSnippet );
-
-		} else if ( biasSnippet ) {
+		if ( biasSnippet ) {
 
 			snippet = builder.generateTextureBias( texture, textureProperty, uvSnippet, biasSnippet, depthSnippet, offsetSnippet );
 
@@ -441,7 +437,11 @@ class TextureNode extends UniformNode {
 
 		} else if ( this.sampler === false ) {
 
-			snippet = builder.generateTextureLoad( texture, textureProperty, uvSnippet, depthSnippet, offsetSnippet );
+			snippet = builder.generateTextureLoad( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, offsetSnippet );
+
+		} else if ( levelSnippet ) {
+
+			snippet = builder.generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, offsetSnippet );
 
 		} else {
 

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

@@ -367,7 +367,7 @@ ${ flowData.code }
 			const channel = '.' + vectorComponents.join( '' ).slice( 0, itemSize );
 			const uvSnippet = `ivec2(${indexSnippet} % ${ propertySizeName }, ${indexSnippet} / ${ propertySizeName })`;
 
-			const snippet = this.generateTextureLoad( null, textureName, uvSnippet, null, null, '0' );
+			const snippet = this.generateTextureLoad( null, textureName, uvSnippet, '0', null, null );
 
 			//
 
@@ -400,12 +400,14 @@ ${ flowData.code }
 	 * @param {?Texture} texture - The texture.
 	 * @param {string} textureProperty - The name of the texture uniform in the shader.
 	 * @param {string} uvIndexSnippet - A GLSL snippet that represents texture coordinates used for sampling.
+	 * @param {?string} levelSnippet - A GLSL snippet that represents the mip level, with level 0 containing a full size version of the texture.
 	 * @param {?string} depthSnippet - A GLSL snippet that represents the 0-based texture array index to sample.
 	 * @param {?string} offsetSnippet - A GLSL snippet that represents the offset that will be applied to the unnormalized texture coordinate before sampling the texture.
-	 * @param {string} [levelSnippet='0u'] - A GLSL snippet that represents the mip level, with level 0 containing a full size version of the texture.
 	 * @return {string} The GLSL snippet.
 	 */
-	generateTextureLoad( texture, textureProperty, uvIndexSnippet, depthSnippet, offsetSnippet, levelSnippet = '0' ) {
+	generateTextureLoad( texture, textureProperty, uvIndexSnippet, levelSnippet, depthSnippet, offsetSnippet ) {
+
+		if ( levelSnippet === null ) levelSnippet = '0';
 
 		let snippet;
 

src/renderers/webgpu/nodes/WGSLNodeBuilder.js

@@ -497,7 +497,7 @@ class WGSLNodeBuilder extends NodeBuilder {
 
 		const coordSnippet = `${ vecType }<u32>( ${ wrapFunction }( ${ uvSnippet } ) * ${ vecType }<f32>( ${ textureDimension } ) )`;
 
-		return this.generateTextureLoad( texture, textureProperty, coordSnippet, depthSnippet, null, levelSnippet );
+		return this.generateTextureLoad( texture, textureProperty, coordSnippet, levelSnippet, depthSnippet, null );
 
 	}
 
@@ -507,14 +507,14 @@ class WGSLNodeBuilder extends NodeBuilder {
 	 * @param {Texture} texture - The texture.
 	 * @param {string} textureProperty - The name of the texture uniform in the shader.
 	 * @param {string} uvIndexSnippet - A WGSL snippet that represents texture coordinates used for sampling.
+	 * @param {?string} levelSnippet - A WGSL snippet that represents the mip level, with level 0 containing a full size version of the texture.
 	 * @param {?string} depthSnippet - A WGSL snippet that represents 0-based texture array index to sample.
 	 * @param {?string} offsetSnippet - A WGSL snippet that represents the offset that will be applied to the unnormalized texture coordinate before sampling the texture.
-	 * @param {string} [levelSnippet='0u'] - A WGSL snippet that represents the mip level, with level 0 containing a full size version of the texture.
 	 * @return {string} The WGSL snippet.
 	 */
-	generateTextureLoad( texture, textureProperty, uvIndexSnippet, depthSnippet, offsetSnippet, levelSnippet = '0u' ) {
+	generateTextureLoad( texture, textureProperty, uvIndexSnippet, levelSnippet, depthSnippet, offsetSnippet ) {
 
-		let snippet;
+		if ( levelSnippet === null ) levelSnippet = '0u';
 
 		if ( offsetSnippet ) {
 
@@ -522,6 +522,8 @@ class WGSLNodeBuilder extends NodeBuilder {
 
 		}
 
+		let snippet;
+
 		if ( depthSnippet ) {
 
 			snippet = `textureLoad( ${ textureProperty }, ${ uvIndexSnippet }, ${ depthSnippet }, u32( ${ levelSnippet } ) )`;