Updated builds

build/three.js

@@ -18775,11 +18775,9 @@
 				return;
 			}
 
-			const {
-				width,
-				height,
-				data
-			} = srcTexture.image;
+			const width = sourceBox.max.x - sourceBox.min.x + 1;
+			const height = sourceBox.max.y - sourceBox.min.y + 1;
+			const depth = sourceBox.max.z - sourceBox.min.z + 1;
 			const glFormat = utils.convert(dstTexture.format);
 			const glType = utils.convert(dstTexture.type);
 			let glTarget;
@@ -18811,9 +18809,11 @@
 
 			const unpackSkipImages = _gl.getParameter(_gl.UNPACK_SKIP_IMAGES);
 
-			_gl.pixelStorei(_gl.UNPACK_ROW_LENGTH, width);
+			const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[0] : srcTexture.image;
+
+			_gl.pixelStorei(_gl.UNPACK_ROW_LENGTH, image.width);
 
-			_gl.pixelStorei(_gl.UNPACK_IMAGE_HEIGHT, height);
+			_gl.pixelStorei(_gl.UNPACK_IMAGE_HEIGHT, image.height);
 
 			_gl.pixelStorei(_gl.UNPACK_SKIP_PIXELS, sourceBox.min.x);
 
@@ -18821,7 +18821,17 @@
 
 			_gl.pixelStorei(_gl.UNPACK_SKIP_IMAGES, sourceBox.min.z);
 
-			_gl.texSubImage3D(glTarget, level, position.x, position.y, position.z, sourceBox.max.x - sourceBox.min.x + 1, sourceBox.max.y - sourceBox.min.y + 1, sourceBox.max.z - sourceBox.min.z + 1, glFormat, glType, data);
+			if (srcTexture.isDataTexture || srcTexture.isDataTexture3D) {
+				_gl.texSubImage3D(glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image.data);
+			} else {
+				if (srcTexture.isCompressedTexture) {
+					console.warn('THREE.WebGLRenderer.copyTextureToTexture3D: untested support for compressed srcTexture.');
+
+					_gl.compressedTexSubImage3D(glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, image.data);
+				} else {
+					_gl.texSubImage3D(glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image);
+				}
+			}
 
 			_gl.pixelStorei(_gl.UNPACK_ROW_LENGTH, unpackRowLen);
 

build/three.module.js

@@ -25589,7 +25589,9 @@ function WebGLRenderer( parameters = {} ) {
 
 		}
 
-		const { width, height, data } = srcTexture.image;
+		const width = sourceBox.max.x - sourceBox.min.x + 1;
+		const height = sourceBox.max.y - sourceBox.min.y + 1;
+		const depth = sourceBox.max.z - sourceBox.min.z + 1;
 		const glFormat = utils.convert( dstTexture.format );
 		const glType = utils.convert( dstTexture.type );
 		let glTarget;
@@ -25621,25 +25623,32 @@ function WebGLRenderer( parameters = {} ) {
 		const unpackSkipRows = _gl.getParameter( 3315 );
 		const unpackSkipImages = _gl.getParameter( 32877 );
 
-		_gl.pixelStorei( 3314, width );
-		_gl.pixelStorei( 32878, height );
+		const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[ 0 ] : srcTexture.image;
+
+		_gl.pixelStorei( 3314, image.width );
+		_gl.pixelStorei( 32878, image.height );
 		_gl.pixelStorei( 3316, sourceBox.min.x );
 		_gl.pixelStorei( 3315, sourceBox.min.y );
 		_gl.pixelStorei( 32877, sourceBox.min.z );
 
-		_gl.texSubImage3D(
-			glTarget,
-			level,
-			position.x,
-			position.y,
-			position.z,
-			sourceBox.max.x - sourceBox.min.x + 1,
-			sourceBox.max.y - sourceBox.min.y + 1,
-			sourceBox.max.z - sourceBox.min.z + 1,
-			glFormat,
-			glType,
-			data
-		);
+		if ( srcTexture.isDataTexture || srcTexture.isDataTexture3D ) {
+
+			_gl.texSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image.data );
+
+		} else {
+
+			if ( srcTexture.isCompressedTexture ) {
+
+				console.warn( 'THREE.WebGLRenderer.copyTextureToTexture3D: untested support for compressed srcTexture.' );
+				_gl.compressedTexSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, image.data );
+
+			} else {
+
+				_gl.texSubImage3D( glTarget, level, position.x, position.y, position.z, width, height, depth, glFormat, glType, image );
+
+			}
+
+		}
 
 		_gl.pixelStorei( 3314, unpackRowLen );
 		_gl.pixelStorei( 32878, unpackImageHeight );