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diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.h b/libs/renderengine/skia/SkiaGLRenderEngine.h
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+++ b/libs/renderengine/skia/SkiaGLRenderEngine.h
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+/*
+ * Copyright 2020 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 SF_SKIAGLRENDERENGINE_H_
+#define SF_SKIAGLRENDERENGINE_H_
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+#include <GrDirectContext.h>
+#include <SkSurface.h>
+#include <android-base/thread_annotations.h>
+#include <renderengine/ExternalTexture.h>
+#include <renderengine/RenderEngine.h>
+#include <sys/types.h>
+
+#include <mutex>
+#include <unordered_map>
+
+#include "AutoBackendTexture.h"
+#include "EGL/egl.h"
+#include "GrContextOptions.h"
+#include "SkImageInfo.h"
+#include "SkiaRenderEngine.h"
+#include "android-base/macros.h"
+#include "debug/SkiaCapture.h"
+#include "filters/BlurFilter.h"
+#include "filters/LinearEffect.h"
+#include "filters/StretchShaderFactory.h"
+
+namespace android {
+namespace renderengine {
+namespace skia {
+
+class SkiaGLRenderEngine : public skia::SkiaRenderEngine {
+public:
+    static std::unique_ptr<SkiaGLRenderEngine> create(const RenderEngineCreationArgs& args);
+    SkiaGLRenderEngine(const RenderEngineCreationArgs& args, EGLDisplay display, EGLContext ctxt,
+                       EGLSurface placeholder, EGLContext protectedContext,
+                       EGLSurface protectedPlaceholder);
+    ~SkiaGLRenderEngine() override EXCLUDES(mRenderingMutex);
+
+    std::future<void> primeCache() override;
+    status_t drawLayers(const DisplaySettings& display,
+                        const std::vector<const LayerSettings*>& layers,
+                        const std::shared_ptr<ExternalTexture>& buffer,
+                        const bool useFramebufferCache, base::unique_fd&& bufferFence,
+                        base::unique_fd* drawFence) override;
+    void cleanupPostRender() override;
+    void cleanFramebufferCache() override{};
+    int getContextPriority() override;
+    bool isProtected() const override { return mInProtectedContext; }
+    bool supportsProtectedContent() const override;
+    void useProtectedContext(bool useProtectedContext) override;
+    bool supportsBackgroundBlur() override { return mBlurFilter != nullptr; }
+    void assertShadersCompiled(int numShaders) override;
+    void onPrimaryDisplaySizeChanged(ui::Size size) override;
+    int reportShadersCompiled() override;
+
+protected:
+    void dump(std::string& result) override;
+    size_t getMaxTextureSize() const override;
+    size_t getMaxViewportDims() const override;
+    void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;
+    void unmapExternalTextureBuffer(const sp<GraphicBuffer>& buffer) override;
+    bool canSkipPostRenderCleanup() const override;
+
+private:
+    static EGLConfig chooseEglConfig(EGLDisplay display, int format, bool logConfig);
+    static EGLContext createEglContext(EGLDisplay display, EGLConfig config,
+                                       EGLContext shareContext,
+                                       std::optional<ContextPriority> contextPriority,
+                                       Protection protection);
+    static std::optional<RenderEngine::ContextPriority> createContextPriority(
+            const RenderEngineCreationArgs& args);
+    static EGLSurface createPlaceholderEglPbufferSurface(EGLDisplay display, EGLConfig config,
+                                                         int hwcFormat, Protection protection);
+    inline SkRect getSkRect(const FloatRect& layer);
+    inline SkRect getSkRect(const Rect& layer);
+    inline std::pair<SkRRect, SkRRect> getBoundsAndClip(const FloatRect& bounds,
+                                                        const FloatRect& crop, float cornerRadius);
+    inline bool layerHasBlur(const LayerSettings* layer, bool colorTransformModifiesAlpha);
+    inline SkColor getSkColor(const vec4& color);
+    inline SkM44 getSkM44(const mat4& matrix);
+    inline SkPoint3 getSkPoint3(const vec3& vector);
+    inline GrDirectContext* getActiveGrContext() const;
+
+    base::unique_fd flush();
+    bool waitFence(base::unique_fd fenceFd);
+    void initCanvas(SkCanvas* canvas, const DisplaySettings& display);
+    void drawShadow(SkCanvas* canvas, const SkRRect& casterRRect,
+                    const ShadowSettings& shadowSettings);
+    // If requiresLinearEffect is true or the layer has a stretchEffect a new shader is returned.
+    // Otherwise it returns the input shader.
+    sk_sp<SkShader> createRuntimeEffectShader(sk_sp<SkShader> shader,
+                                              const LayerSettings* layer,
+                                              const DisplaySettings& display,
+                                              bool undoPremultipliedAlpha,
+                                              bool requiresLinearEffect);
+
+    EGLDisplay mEGLDisplay;
+    EGLContext mEGLContext;
+    EGLSurface mPlaceholderSurface;
+    EGLContext mProtectedEGLContext;
+    EGLSurface mProtectedPlaceholderSurface;
+    BlurFilter* mBlurFilter = nullptr;
+
+    const PixelFormat mDefaultPixelFormat;
+    const bool mUseColorManagement;
+
+    // Identifier used or various mappings of layers to various
+    // textures or shaders
+    using GraphicBufferId = uint64_t;
+
+    // Number of external holders of ExternalTexture references, per GraphicBuffer ID.
+    std::unordered_map<GraphicBufferId, int32_t> mGraphicBufferExternalRefs
+            GUARDED_BY(mRenderingMutex);
+    // Cache of GL textures that we'll store per GraphicBuffer ID, shared between GPU contexts.
+    std::unordered_map<GraphicBufferId, std::shared_ptr<AutoBackendTexture::LocalRef>> mTextureCache
+            GUARDED_BY(mRenderingMutex);
+    std::unordered_map<LinearEffect, sk_sp<SkRuntimeEffect>, LinearEffectHasher> mRuntimeEffects;
+    AutoBackendTexture::CleanupManager mTextureCleanupMgr GUARDED_BY(mRenderingMutex);
+
+    StretchShaderFactory mStretchShaderFactory;
+    // Mutex guarding rendering operations, so that:
+    // 1. GL operations aren't interleaved, and
+    // 2. Internal state related to rendering that is potentially modified by
+    // multiple threads is guaranteed thread-safe.
+    mutable std::mutex mRenderingMutex;
+
+    sp<Fence> mLastDrawFence;
+
+    // Graphics context used for creating surfaces and submitting commands
+    sk_sp<GrDirectContext> mGrContext;
+    // Same as above, but for protected content (eg. DRM)
+    sk_sp<GrDirectContext> mProtectedGrContext;
+
+    bool mInProtectedContext = false;
+    // Object to capture commands send to Skia.
+    std::unique_ptr<SkiaCapture> mCapture;
+
+    // Implements PersistentCache as a way to monitor what SkSL shaders Skia has
+    // cached.
+    class SkSLCacheMonitor : public GrContextOptions::PersistentCache {
+    public:
+        SkSLCacheMonitor() = default;
+        ~SkSLCacheMonitor() override = default;
+
+        sk_sp<SkData> load(const SkData& key) override;
+
+        void store(const SkData& key, const SkData& data, const SkString& description) override;
+
+        int shadersCachedSinceLastCall() {
+            const int shadersCachedSinceLastCall = mShadersCachedSinceLastCall;
+            mShadersCachedSinceLastCall = 0;
+            return shadersCachedSinceLastCall;
+        }
+
+    private:
+        int mShadersCachedSinceLastCall = 0;
+    };
+
+    SkSLCacheMonitor mSkSLCacheMonitor;
+};
+
+} // namespace skia
+} // namespace renderengine
+} // namespace android
+
+#endif /* SF_GLESRENDERENGINE_H_ */