Add support for KTX & KTX2 image format

Add support glTF KHR_texture_basisu extension

2 files changed, 113 insertions, 0 deletions

diff --git a/modules/gltf/extensions/gltf_document_extension_texture_ktx.cpp b/modules/gltf/extensions/gltf_document_extension_texture_ktx.cpp
new file mode 100644
index 0000000000..ca61a24201
--- /dev/null
+++ b/modules/gltf/extensions/gltf_document_extension_texture_ktx.cpp
@@ -0,0 +1,66 @@
+/**************************************************************************/
+/*  gltf_document_extension_texture_ktx.cpp                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "gltf_document_extension_texture_ktx.h"
+
+// Import process.
+Error GLTFDocumentExtensionTextureKTX::import_preflight(Ref<GLTFState> p_state, Vector<String> p_extensions) {
+	if (!p_extensions.has("KHR_texture_basisu")) {
+		return ERR_SKIP;
+	}
+	return OK;
+}
+
+Vector<String> GLTFDocumentExtensionTextureKTX::get_supported_extensions() {
+	Vector<String> ret;
+	ret.push_back("KHR_texture_basisu");
+	return ret;
+}
+
+Error GLTFDocumentExtensionTextureKTX::parse_image_data(Ref<GLTFState> p_state, const PackedByteArray &p_image_data, const String &p_mime_type, Ref<Image> r_image) {
+	if (p_mime_type == "image/ktx2") {
+		return r_image->load_ktx_from_buffer(p_image_data);
+	}
+	return OK;
+}
+
+Error GLTFDocumentExtensionTextureKTX::parse_texture_json(Ref<GLTFState> p_state, const Dictionary &p_texture_json, Ref<GLTFTexture> r_gltf_texture) {
+	if (!p_texture_json.has("extensions")) {
+		return OK;
+	}
+	const Dictionary &extensions = p_texture_json["extensions"];
+	if (!extensions.has("KHR_texture_basisu")) {
+		return OK;
+	}
+	const Dictionary &texture_ktx = extensions["KHR_texture_basisu"];
+	ERR_FAIL_COND_V(!texture_ktx.has("source"), ERR_PARSE_ERROR);
+	r_gltf_texture->set_src_image(texture_ktx["source"]);
+	return OK;
+}
diff --git a/modules/gltf/extensions/gltf_document_extension_texture_ktx.h b/modules/gltf/extensions/gltf_document_extension_texture_ktx.h
new file mode 100644
index 0000000000..e4cb38a044
--- /dev/null
+++ b/modules/gltf/extensions/gltf_document_extension_texture_ktx.h
@@ -0,0 +1,47 @@
+/**************************************************************************/
+/*  gltf_document_extension_texture_ktx.h                                 */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#ifndef GLTF_DOCUMENT_EXTENSION_TEXTURE_KTX_H
+#define GLTF_DOCUMENT_EXTENSION_TEXTURE_KTX_H
+
+#include "gltf_document_extension.h"
+
+class GLTFDocumentExtensionTextureKTX : public GLTFDocumentExtension {
+	GDCLASS(GLTFDocumentExtensionTextureKTX, GLTFDocumentExtension);
+
+public:
+	// Import process.
+	Error import_preflight(Ref<GLTFState> p_state, Vector<String> p_extensions) override;
+	Vector<String> get_supported_extensions() override;
+	Error parse_image_data(Ref<GLTFState> p_state, const PackedByteArray &p_image_data, const String &p_mime_type, Ref<Image> r_image) override;
+	Error parse_texture_json(Ref<GLTFState> p_state, const Dictionary &p_texture_json, Ref<GLTFTexture> r_gltf_texture) override;
+};
+
+#endif // GLTF_DOCUMENT_EXTENSION_TEXTURE_KTX_H