add macOS implementation

macos/include/matdbg/ShaderExtractor.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef MATDBG_SHADEREXTRACTOR_H
+#define MATDBG_SHADEREXTRACTOR_H
+
+#include <filaflat/ChunkContainer.h>
+#include <filaflat/MaterialChunk.h>
+
+#include <backend/DriverEnums.h>
+
+#include <utils/CString.h>
+
+namespace filament {
+namespace matdbg {
+
+// ShaderExtractor is a utility class for extracting shader source from a material package. It works
+// in a manner similar to ShaderReplacer.
+class ShaderExtractor {
+public:
+    ShaderExtractor(backend::Backend backend, const void* data, size_t size);
+    bool parse() noexcept;
+    bool getShader(backend::ShaderModel shaderModel,
+            Variant variant, backend::ShaderStage stage, filaflat::ShaderContent& shader) noexcept;
+    bool getDictionary(filaflat::BlobDictionary& dictionary) noexcept;
+
+    static utils::CString spirvToGLSL(const uint32_t* data, size_t wordCount);
+    static utils::CString spirvToText(const uint32_t* data, size_t wordCount);
+
+private:
+    filaflat::ChunkContainer mChunkContainer;
+    filaflat::MaterialChunk mMaterialChunk;
+    filamat::ChunkType mMaterialTag = filamat::ChunkType::Unknown;
+    filamat::ChunkType mDictionaryTag = filamat::ChunkType::Unknown;
+};
+
+} // namespace matdbg
+} // namespace filament
+
+#endif  // MATDBG_SHADEREXTRACTOR_H