1 files changed, 61 insertions, 0 deletions
diff --git a/platform_tools/android/apps/arcore/src/main/cpp/background_renderer.h b/platform_tools/android/apps/arcore/src/main/cpp/background_renderer.h
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index 0000000000..0e4f701f44
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+++ b/platform_tools/android/apps/arcore/src/main/cpp/background_renderer.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2017 Google Inc. All Rights Reserved.
+ *
+ * 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 C_ARCORE_HELLO_AR_BACKGROUND_RENDERER_H_
+#define C_ARCORE_HELLO_AR_BACKGROUND_RENDERER_H_
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <cstdlib>
+
+#include "arcore_c_api.h"
+#include "util.h"
+
+namespace hello_ar {
+
+// This class renders the passthrough camera image into the OpenGL frame.
+    class BackgroundRenderer {
+    public:
+        BackgroundRenderer() = default;
+
+        ~BackgroundRenderer() = default;
+
+        // Sets up OpenGL state.  Must be called on the OpenGL thread and before any
+        // other methods below.
+        void InitializeGlContent();
+
+        // Draws the background image.  This methods must be called for every ArFrame
+        // returned by ArSession_update() to catch display geometry change events.
+        void Draw(const ArSession *session, const ArFrame *frame);
+
+        // Returns the generated texture name for the GL_TEXTURE_EXTERNAL_OES target.
+        GLuint GetTextureId() const;
+
+    private:
+        static constexpr int kNumVertices = 4;
+
+        GLuint shader_program_;
+        GLuint texture_id_;
+
+        GLuint attribute_vertices_;
+        GLuint attribute_uvs_;
+        GLuint uniform_texture_;
+
+        float transformed_uvs_[kNumVertices * 2];
+        bool uvs_initialized_ = false;
+    };
+}  // namespace hello_ar
+#endif  // C_ARCORE_HELLO_AR_BACKGROUND_RENDERER_H_