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Packages/com.omarator.mosissdk/Plugins/Android/cpp/opengl_backend.h

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+#pragma once
+
+#include "texture_backend.h"
+#include <glad/gles2.h>
+#include <glad/egl.h>
+
+/**
+ * OpenGL ES implementation of ITextureBackend.
+ * Imports AHardwareBuffer via EGL image and blits to a standard GL_TEXTURE_2D.
+ */
+class OpenGLTextureBackend : public ITextureBackend
+{
+public:
+    OpenGLTextureBackend() = default;
+    ~OpenGLTextureBackend() override { Destroy(); }
+
+    bool Create(AHardwareBuffer* buffer) override;
+    void Update() override;
+    void Destroy() override;
+    void* GetNativeTexturePtr() override;
+    int GetWidth() const override { return m_Width; }
+    int GetHeight() const override { return m_Height; }
+    bool IsVulkan() const override { return false; }
+
+    /**
+     * Initialize GLAD for OpenGL ES.
+     * Must be called on the render thread before Create().
+     * @return true if initialization succeeded
+     */
+    static bool InitializeGLAD();
+
+private:
+    void Blit();
+
+    GLuint m_SourceTexture = 0;      // GL_TEXTURE_EXTERNAL_OES from HardwareBuffer
+    GLuint m_SourceFramebuffer = 0;
+    GLuint m_DestTexture = 0;        // GL_TEXTURE_2D for Unity
+    GLuint m_DestFramebuffer = 0;
+    GLint m_Width = 0;
+    GLint m_Height = 0;
+    bool m_Created = false;
+};