refactor Windows rendering into standalone DLL

thermion_flutter/thermion_flutter/windows/CMakeLists.txt

@@ -14,11 +14,11 @@ list(APPEND PLUGIN_SOURCES
   "thermion_flutter_plugin.h"
 )
 
-set(USE_ANGLE FALSE)
+set(THERMION_EGL FALSE)
 set(WGL_USE_BACKING_WINDOW FALSE)
 
-if(USE_ANGLE)
-  add_compile_definitions(USE_ANGLE)
+if(THERMION_EGL)
+  add_compile_definitions(THERMION_EGL)
   list(APPEND PLUGIN_SOURCES    "flutter_angle_texture.cpp"   "egl_context.cpp"   )
 else() 
   if(WGL_USE_BACKING_WINDOW)
@@ -52,7 +52,7 @@ include_directories(
   "${CMAKE_SOURCE_DIR}/../../../../thermion_dart/native/include"
 )
 
-if(USE_ANGLE)
+if(THERMION_EGL)
   list(APPEND GL_LIBS
     EGL
     GLESv2
@@ -87,7 +87,7 @@ target_link_libraries(${PLUGIN_NAME} PRIVATE
 )
 
 # List of absolute paths to libraries that should be bundled with the plugin
-if(USE_ANGLE)
+if(THERMION_EGL)
 set(thermion_flutter_bundled_libraries
   ${CMAKE_CURRENT_SOURCE_DIR}/lib/Debug/angle/libEGL.dll
   ${CMAKE_CURRENT_SOURCE_DIR}/lib/Debug/angle/libGLESv2.dll

thermion_flutter/thermion_flutter/windows/egl_context.h

@@ -1,36 +0,0 @@
-#ifndef _EGL_CONTEXT_H
-#define _EGL_CONTEXT_H
-
-#include <Windows.h>
-
-#include <flutter/method_channel.h>
-#include <flutter/plugin_registrar_windows.h>
-#include <flutter/standard_method_codec.h>
-#include <flutter/texture_registrar.h>
-
-#include "flutter_angle_texture.h"
-#include "backend/platforms/PlatformEGL.h"
-#include "flutter_render_context.h"
-
-namespace thermion_flutter {
-
-class FlutterEGLContext : public FlutterRenderContext {
-public:
-  FlutterEGLContext(flutter::PluginRegistrarWindows* pluginRegistrar, flutter::TextureRegistrar* textureRegistrar);
-  void* GetSharedContext();    
-  void RenderCallback();
-  void* GetPlatform();
-  void CreateRenderingSurface(uint32_t width, uint32_t height, std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result, uint32_t left, uint32_t top );
-
-private:
-  void* _context = nullptr;
-  EGLConfig _eglConfig = NULL;
-  EGLDisplay _eglDisplay = NULL;
-  ID3D11Device* _D3D11Device = nullptr;
-  ID3D11DeviceContext* _D3D11DeviceContext = nullptr;
-  filament::backend::Platform* _platform = nullptr;
-};
-
-}
-
-#endif

thermion_flutter/thermion_flutter/windows/flutter_render_context.h

@@ -1,39 +0,0 @@
-#ifndef _FLUTTER_RENDER_CONTEXT_H
-#define _FLUTTER_RENDER_CONTEXT_H
-
-#include <flutter/method_channel.h>
-#include <flutter/plugin_registrar_windows.h>
-#include <flutter/standard_method_codec.h>
-#include <flutter/texture_registrar.h>
-
-#include "flutter_texture_buffer.h"
-
-namespace thermion_flutter {
-
-    class FlutterRenderContext {
-    public:
-
-        void CreateRenderingSurface(uint32_t width, uint32_t height, std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result, uint32_t left, uint32_t top);
-
-        void DestroyRenderingSurface(std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result);
-        
-        int64_t GetFlutterTextureId() {
-            if(!_active) {
-                return -1;
-            }
-            return _active->flutterTextureId;
-        }
-
-        void *GetSharedContext();
-       
-    protected:
-        FlutterRenderContext( flutter::PluginRegistrarWindows* pluginRegistrar, flutter::TextureRegistrar* textureRegistrar) : _pluginRegistrar(pluginRegistrar), _textureRegistrar(textureRegistrar) {};
-
-        flutter::PluginRegistrarWindows* _pluginRegistrar;
-        flutter::TextureRegistrar* _textureRegistrar;
-        std::unique_ptr<FlutterTextureBuffer> _active = nullptr;
-        std::unique_ptr<FlutterTextureBuffer> _inactive = nullptr;
-    };
-}
-
-#endif

thermion_flutter/thermion_flutter/windows/flutter_texture_buffer.h

@@ -1,18 +0,0 @@
-#ifndef _FLUTTER_TEXTURE_BUFFER_H
-#define _FLUTTER_TEXTURE_BUFFER_H
-
-#include <flutter/method_channel.h>
-#include <flutter/plugin_registrar_windows.h>
-#include <flutter/standard_method_codec.h>
-#include <flutter/texture_registrar.h>
-
-
-namespace thermion_flutter {
-
-    class FlutterTextureBuffer {
-    public:
-        int64_t flutterTextureId = -1;
-    };
-}
-
-#endif

thermion_flutter/thermion_flutter/windows/rendering/egl/CMakeLists.txt

@@ -0,0 +1,62 @@
+cmake_minimum_required(VERSION 3.14)
+set(PROJECT_NAME "thermion_egl")
+project(${PROJECT_NAME} LANGUAGES C CXX)
+
+cmake_policy(VERSION 3.14...3.25)
+
+add_compile_definitions(THERMION_EGL)
+
+set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+set(BUILD_SHARED_LIBS TRUE)
+set(CMAKE_ENABLE_EXPORTS TRUE)
+
+add_library(${PROJECT_NAME} SHARED
+  "egl_context.cpp"
+  "egl_texture.cpp"
+)
+
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_20)
+include_directories(${PROJECT_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/../../include"
+)
+
+add_library(EGL SHARED IMPORTED)
+set_property(TARGET EGL PROPERTY IMPORTED_IMPLIB_DEBUG "E:\\angle\\libEGL.dll.lib")
+set_property(TARGET EGL PROPERTY IMPORTED_IMPLIB_PROFILE "E:\\angle\\libEGL.dll.lib")
+set_property(TARGET EGL PROPERTY IMPORTED_IMPLIB_RELEASE "E:\\angle\\libEGL.dll.lib")
+set_property(TARGET EGL PROPERTY IMPORTED_IMPLIB_MINSIZEREL "E:\\angle\\libEGL.dll.lib")
+set_property(TARGET EGL PROPERTY IMPORTED_IMPLIB_RELWITHDEBINFO "E:\\angle\\libEGL.dll.lib")
+add_library(GLESv2 SHARED IMPORTED)
+set_property(TARGET GLESv2 PROPERTY IMPORTED_IMPLIB_DEBUG "E:\\angle\\libGLESv2.dll.lib")
+set_property(TARGET GLESv2 PROPERTY IMPORTED_IMPLIB_PROFILE "E:\\angle\\libGLESv2.dll.lib")
+set_property(TARGET GLESv2 PROPERTY IMPORTED_IMPLIB_RELEASE "E:\\angle\\libGLESv2.dll")
+set_property(TARGET GLESv2 PROPERTY IMPORTED_IMPLIB_MINSIZEREL "E:\\angle\\libGLESv2.dll")
+set_property(TARGET GLESv2 PROPERTY IMPORTED_IMPLIB_RELWITHDEBINFO "E:\\angle\\libGLESv2.dll")
+
+target_link_libraries(${PROJECT_NAME} PRIVATE 
+ Shlwapi
+ EGL 
+ GLESv2
+ dxgi
+  d3d11
+)
+
+# Test executable
+add_executable(${PROJECT_NAME}_test
+  "main.cpp"
+)
+
+# Make sure the test depends on the library
+add_dependencies(${PROJECT_NAME}_test ${PROJECT_NAME})
+
+target_link_libraries(${PROJECT_NAME}_test PRIVATE
+  ${PROJECT_NAME}
+)
+
+# Copy ANGLE DLLs to the output directory
+add_custom_command(TARGET ${PROJECT_NAME}_test POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        "E:/angle/libEGL.dll"
+        "E:/angle/libGLESv2.dll"
+        "$<TARGET_FILE_DIR:${PROJECT_NAME}_test>"
+)

thermion_flutter/thermion_flutter/windows/rendering/egl/egl_context.cpp

@@ -1,20 +1,13 @@
+#include <functional>
+#include <iostream>
+#include <vector>
 
 #include "egl_context.h"
 
-#define FILAMENT_USE_EXTERNAL_GLES3
-#include <gl_headers.h>
+namespace thermion::windows::egl {
 
-#pragma comment(lib, "dwmapi.lib")
-#pragma comment(lib, "comctl32.lib")
-
-namespace thermion_flutter {
-
-FlutterEGLContext::FlutterEGLContext(
-  flutter::PluginRegistrarWindows* pluginRegistrar, 
-  flutter::TextureRegistrar* textureRegistrar) : FlutterRenderContext(pluginRegistrar, textureRegistrar) {
+FlutterEGLContext::FlutterEGLContext() {
     
-  _platform = new filament::backend::PlatformEGL();
-
   // D3D starts here
   IDXGIAdapter *adapter_ = nullptr;
 
@@ -81,13 +74,17 @@ FlutterEGLContext::FlutterEGLContext(
   // *                 *
   // *******************
   EGLBoolean bindAPI = eglBindAPI(EGL_OPENGL_ES_API);
-  if (UTILS_UNLIKELY(!bindAPI)) {
+  if (!bindAPI) {
     std::cout << "eglBindAPI EGL_OPENGL_ES_API failed" << std::endl;
     return;
   }
 
   _eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
-  assert_invariant(_eglDisplay != EGL_NO_DISPLAY);
+  if (_eglDisplay == EGL_NO_DISPLAY) {
+      std::cout << "eglBindAPI EGL_OPENGL_ES_API failed" << std::endl;
+      return;
+  }
+ 
 
   EGLint major, minor;
   EGLBoolean initialized = false;
@@ -113,12 +110,12 @@ FlutterEGLContext::FlutterEGLContext(
 
   std::cout << "Got major " << major << " and minor " << minor << std::endl;
 
-  if (UTILS_UNLIKELY(!initialized)) {
+  if (!initialized) {
     std::cout << "eglInitialize failed" << std::endl;
     return;
   }
 
-  glext::importGLESExtensionsEntryPoints();
+  // glext::importGLESExtensionsEntryPoints();
 
   EGLint configsCount;
 
@@ -142,34 +139,33 @@ FlutterEGLContext::FlutterEGLContext(
   auto ctx = eglCreateContext(_eglDisplay, _eglConfig, EGL_NO_CONTEXT,contextAttribs);
   _context = (void*)ctx;
 
-  if (UTILS_UNLIKELY(_context == EGL_NO_CONTEXT)) {
+  if (_context == EGL_NO_CONTEXT) {
     return;
   }
 }
 
 void FlutterEGLContext::CreateRenderingSurface(
     uint32_t width, uint32_t height,
-    std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result, 
     uint32_t left, uint32_t top
     ) {
   
-  glext::importGLESExtensionsEntryPoints();
+  // glext::importGLESExtensionsEntryPoints();
 
   if(left != 0 || top != 0) {
-    result->Error("ERROR",
-                  "Rendering with EGL uses a Texture render target/Flutter widget and does not need a window offset.");
+    // result->Error("ERROR",
+    //               "Rendering with EGL uses a Texture render target/Flutter widget and does not need a window offset.");
     return;
   }
 
   if (_active.get()) {
-    result->Error("ERROR",
-                  "Texture already exists. You must call destroyTexture before "
-                  "attempting to create a new one.");
+    // result->Error("ERROR",
+    //               "Texture already exists. You must call destroyTexture before "
+    //               "attempting to create a new one.");
     return;
   }
 
-  std::unique_ptr<FlutterTextureBuffer> active = std::make_unique<FlutterAngleTexture>(
-      _pluginRegistrar, _textureRegistrar, std::move(result), width, height,
+  _active = std::make_unique<EGLTexture>(
+      width, height,
       _D3D11Device, _D3D11DeviceContext, _eglConfig, _eglDisplay, _context,
       [=](size_t width, size_t height) {
         std::cout << "RESIZE" << std::endl;
@@ -179,13 +175,12 @@ void FlutterEGLContext::CreateRenderingSurface(
           // auto val = std::make_unique<flutter::EncodableValue>(list);
           // this->_channel->InvokeMethod("resize", std::move(val), nullptr);
       });
-  _active = std::move(active);
 
 }
 
 void FlutterEGLContext::RenderCallback() {
   if(_active.get()) {
-    ((FlutterAngleTexture*)_active.get())->RenderCallback();
+    ((EGLTexture*)_active.get())->RenderCallback();
   }
 }
 
@@ -193,8 +188,5 @@ void* FlutterEGLContext::GetSharedContext() {
   return (void*)_context;
 }
 
-void* FlutterEGLContext::GetPlatform() { 
-  return (void*)_platform;
 }
 
-}

thermion_flutter/thermion_flutter/windows/rendering/egl/egl_context.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <memory>
+#include <Windows.h>
+
+#include "egl_texture.h"
+
+namespace thermion::windows::egl {
+
+class FlutterEGLContext {
+public:
+  FlutterEGLContext();
+  void* GetSharedContext();    
+  void RenderCallback();
+  void CreateRenderingSurface(uint32_t width, uint32_t height, uint32_t left, uint32_t top);
+
+private:
+  void* _context = nullptr;
+  EGLConfig _eglConfig = NULL;
+  EGLDisplay _eglDisplay = NULL;
+  ID3D11Device* _D3D11Device = nullptr;
+  ID3D11DeviceContext* _D3D11DeviceContext = nullptr;
+  std::unique_ptr<EGLTexture> _active;
+};
+
+}

thermion_flutter/thermion_flutter/windows/rendering/egl/egl_texture.cpp

@@ -1,13 +1,11 @@
-#include "flutter_angle_texture.h"
-
-#include <flutter/method_channel.h>
-#include <flutter/plugin_registrar_windows.h>
-#include <flutter/standard_method_codec.h>
-#include <flutter/texture_registrar.h>
+#include "egl_texture.h"
 
+#include <functional>
+#include <iostream>
+#include <memory>
 #include <thread>
 
-namespace thermion_flutter {
+namespace thermion::windows::egl {
 
 static void logEglError(const char *name) noexcept {
   const char *err;
@@ -61,14 +59,14 @@ static void logEglError(const char *name) noexcept {
   std::cout << name << " failed with " << err << std::endl;
 }
 
-void FlutterAngleTexture::RenderCallback() {
+void EGLTexture::RenderCallback() {
   glFinish();
   _D3D11DeviceContext->CopyResource(_externalD3DTexture2D.Get(),
                                     _internalD3DTexture2D.Get());
   _D3D11DeviceContext->Flush();
 }
 
-FlutterAngleTexture::~FlutterAngleTexture() {
+EGLTexture::~EGLTexture() {
   if (_eglDisplay != EGL_NO_DISPLAY && _eglSurface != EGL_NO_SURFACE) {
     eglReleaseTexImage(_eglDisplay, _eglSurface, EGL_BACK_BUFFER);
   }
@@ -81,17 +79,13 @@ FlutterAngleTexture::~FlutterAngleTexture() {
   glDeleteTextures(1, &this->glTextureId);
 }
 
-FlutterAngleTexture::FlutterAngleTexture(
-    flutter::PluginRegistrarWindows *pluginRegistrar,
-    flutter::TextureRegistrar *textureRegistrar,
-    std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result,
+EGLTexture::EGLTexture(
     uint32_t width, uint32_t height, ID3D11Device *D3D11Device,
     ID3D11DeviceContext *D3D11DeviceContext, EGLConfig eglConfig,
     EGLDisplay eglDisplay, EGLContext eglContext,
     std::function<void(size_t, size_t)> onResizeRequested
     )
-    : _pluginRegistrar(pluginRegistrar), _textureRegistrar(textureRegistrar),
-      _width(width), _height(height), _D3D11Device(D3D11Device),
+    : _width(width), _height(height), _D3D11Device(D3D11Device),
       _D3D11DeviceContext(D3D11DeviceContext), _eglConfig(eglConfig),
       _eglDisplay(eglDisplay), _eglContext(eglContext), _onResizeRequested(onResizeRequested) {
 
@@ -113,7 +107,7 @@ FlutterAngleTexture::FlutterAngleTexture(
   auto hr = _D3D11Device->CreateTexture2D(&d3d11_texture2D_desc, nullptr,
                                           &_internalD3DTexture2D);
   if FAILED (hr) {
-    result->Error("ERROR", "Failed to create D3D texture", nullptr);
+    // result->Error("ERROR", "Failed to create D3D texture", nullptr);
     return;
     ;
   }
@@ -121,14 +115,14 @@ FlutterAngleTexture::FlutterAngleTexture(
   hr = _internalD3DTexture2D.As(&resource);
 
   if FAILED (hr) {
-    result->Error("ERROR", "Failed to create D3D texture", nullptr);
+    // result->Error("ERROR", "Failed to create D3D texture", nullptr);
     return;
     ;
   }
   hr = resource->GetSharedHandle(&_internalD3DTextureHandle);
   if FAILED (hr) {
-    result->Error("ERROR", "Failed to get shared handle to D3D texture",
-                  nullptr);
+    // result->Error("ERROR", "Failed to get shared handle to D3D texture",
+    //               nullptr);
     return;
     ;
   }
@@ -140,22 +134,22 @@ FlutterAngleTexture::FlutterAngleTexture(
   hr = _D3D11Device->CreateTexture2D(&d3d11_texture2D_desc, nullptr,
                                      &_externalD3DTexture2D);
   if FAILED (hr) {
-    result->Error("ERROR", "Failed to create D3D texture", nullptr);
+    // result->Error("ERROR", "Failed to create D3D texture", nullptr);
     return;
     ;
   }
   hr = _externalD3DTexture2D.As(&resource);
 
   if FAILED (hr) {
-    result->Error("ERROR", "Failed to create D3D texture", nullptr);
+    // result->Error("ERROR", "Failed to create D3D texture", nullptr);
     return;
     ;
   }
   hr = resource->GetSharedHandle(&_externalD3DTextureHandle);
   if FAILED (hr) {
-    result->Error("ERROR",
-                  "Failed to get shared handle to external D3D texture",
-                  nullptr);
+    // result->Error("ERROR",
+    //               "Failed to get shared handle to external D3D texture",
+    //               nullptr);
     return;
     ;
   }
@@ -207,37 +201,27 @@ FlutterAngleTexture::FlutterAngleTexture(
   glGetIntegerv(GL_MAJOR_VERSION, &major);
   glGetIntegerv(GL_MINOR_VERSION, &minor);
 
-  _textureDescriptor = std::make_unique<FlutterDesktopGpuSurfaceDescriptor>();
-  _textureDescriptor->struct_size = sizeof(FlutterDesktopGpuSurfaceDescriptor);
-  _textureDescriptor->handle = _externalD3DTextureHandle;
-  _textureDescriptor->width = _textureDescriptor->visible_width = width;
-  _textureDescriptor->height = _textureDescriptor->visible_height = height;
-  _textureDescriptor->release_context = nullptr;
-  _textureDescriptor->release_callback = [](void *release_context) {
+  // _textureDescriptor = std::make_unique<FlutterDesktopGpuSurfaceDescriptor>();
+  // _textureDescriptor->struct_size = sizeof(FlutterDesktopGpuSurfaceDescriptor);
+  // _textureDescriptor->handle = _externalD3DTextureHandle;
+  // _textureDescriptor->width = _textureDescriptor->visible_width = width;
+  // _textureDescriptor->height = _textureDescriptor->visible_height = height;
+  // _textureDescriptor->release_context = nullptr;
+  // _textureDescriptor->release_callback = [](void *release_context) {
 
-  };
-  _textureDescriptor->format = kFlutterDesktopPixelFormatBGRA8888;
+  // };
+  // _textureDescriptor->format = kFlutterDesktopPixelFormatBGRA8888;
 
-  texture =
-      std::make_unique<flutter::TextureVariant>(flutter::GpuSurfaceTexture(
-          kFlutterDesktopGpuSurfaceTypeDxgiSharedHandle,
-          [&](size_t width, size_t height) { 
-            if(width != this->_width || height != this->_height) {
-              this->_onResizeRequested(width, height);
-            }
-            return _textureDescriptor.get(); 
-          }));
+  // texture =
+  //     std::make_unique<flutter::TextureVariant>(flutter::GpuSurfaceTexture(
+  //         kFlutterDesktopGpuSurfaceTypeDxgiSharedHandle,
+  //         [&](size_t width, size_t height) { 
+  //           if(width != this->_width || height != this->_height) {
+  //             this->_onResizeRequested(width, height);
+  //           }
+  //           return _textureDescriptor.get(); 
+  //         }));
 
-  flutterTextureId = _textureRegistrar->RegisterTexture(texture.get());
-  std::cout << "Registered Flutter texture ID " << flutterTextureId
-            << std::endl;
-
-  std::vector<flutter::EncodableValue> resultList;
-  resultList.push_back(flutter::EncodableValue(flutterTextureId));
-  resultList.push_back(flutter::EncodableValue((int64_t) nullptr));
-  resultList.push_back(flutter::EncodableValue(glTextureId));
-  resultList.push_back(flutter::EncodableValue((int64_t) eglContext));
-  result->Success(resultList);
 }
 
 } // namespace thermion_flutter

thermion_flutter/thermion_flutter/windows/rendering/egl/egl_texture.h

@@ -1,14 +1,8 @@
 #pragma once
 
-#ifndef _FLUTTER_ANGLE_TEXTURE_H 
-#define _FLUTTER_ANGLE_TEXTURE_H
-
+#include <functional>
 #include <mutex>
 
-#include <flutter/texture_registrar.h>
-#include <flutter/method_channel.h>
-#include <flutter/plugin_registrar_windows.h>
-
 #include <d3d.h>
 #include <d3d11.h>
 
@@ -22,18 +16,13 @@
 #include <Windows.h>
 #include <wrl.h>
 
-#include "flutter_texture_buffer.h"
-
 typedef uint32_t GLuint;
 
-namespace thermion_flutter {
+namespace thermion::windows::egl {
 
-class FlutterAngleTexture : public FlutterTextureBuffer {
+class EGLTexture {
   public:
-    FlutterAngleTexture(
-        flutter::PluginRegistrarWindows* pluginRegistrar,
-        flutter::TextureRegistrar* textureRegistrar,
-        std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result,
+    EGLTexture(
         uint32_t width,
         uint32_t height,
         ID3D11Device* D3D11Device,
@@ -43,16 +32,14 @@ class FlutterAngleTexture : public FlutterTextureBuffer {
         EGLContext eglContext,
         std::function<void(size_t, size_t)> onResizeRequested
     );    
-    ~FlutterAngleTexture();
+    ~EGLTexture();
 
     void RenderCallback();
-    
+   
     GLuint glTextureId = 0;
-    std::unique_ptr<flutter::TextureVariant> texture;
       
   private:
-    flutter::PluginRegistrarWindows* _pluginRegistrar;
-    flutter::TextureRegistrar* _textureRegistrar;
+    bool _error = false;
     uint32_t _width = 0;
     uint32_t _height = 0;
     bool logged = false;
@@ -72,9 +59,8 @@ class FlutterAngleTexture : public FlutterTextureBuffer {
     EGLConfig _eglConfig = EGL_NO_CONFIG_KHR;
     EGLSurface _eglSurface = EGL_NO_SURFACE;
     
-    std::unique_ptr<FlutterDesktopGpuSurfaceDescriptor> _textureDescriptor = nullptr;
+    // std::unique_ptr<FlutterDesktopGpuSurfaceDescriptor> _textureDescriptor = nullptr;
 
 };
 
 }
-#endif // _FLUTTER_ANGLE_TEXTURE 

thermion_flutter/thermion_flutter/windows/rendering/egl/main.cpp

@@ -0,0 +1,36 @@
+#include "egl_context.h"
+#include <iostream>
+#include <thread>
+#include <chrono>
+
+int main() {
+    std::cout << "Initializing EGL Context..." << std::endl;
+    
+    thermion::windows::egl::FlutterEGLContext context;
+    
+    // Create a rendering surface
+    const uint32_t width = 800;
+    const uint32_t height = 600;
+    
+    std::cout << "Creating rendering surface " << width << "x" << height << std::endl;
+    context.CreateRenderingSurface(width, height, 0, 0);
+    
+    void* sharedContext = context.GetSharedContext();
+    if (sharedContext) {
+        std::cout << "Successfully created shared context" << std::endl;
+    } else {
+        std::cout << "Failed to create shared context" << std::endl;
+        return 1;
+    }
+    
+    // Run a simple render loop
+    std::cout << "Starting render loop..." << std::endl;
+    for (int i = 0; i < 10; i++) {
+        context.RenderCallback();
+        std::cout << "Rendered frame " << i + 1 << std::endl;
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    }
+    
+    std::cout << "EGL Context demo completed" << std::endl;
+    return 0;
+}

thermion_flutter/thermion_flutter/windows/rendering/flutter_render_context.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "flutter_texture_buffer.h"
+
+namespace thermion_flutter {
+
+    class FlutterRenderContext {
+        public:
+            void CreateRenderingSurface(uint32_t width, uint32_t height, uint32_t left, uint32_t top);
+            void DestroyRenderingSurface();
+            void *GetSharedContext();
+            FlutterTextureBuffer GetActiveTexture() {
+                return _active->get();
+            }
+        
+        protected:
+            FlutterRenderContext();
+            std::unique_ptr<FlutterTextureBuffer> _active = nullptr;
+            std::unique_ptr<FlutterTextureBuffer> _inactive = nullptr;
+    };
+}
+
+#endif

thermion_flutter/thermion_flutter/windows/rendering/flutter_texture_buffer.h

@@ -0,0 +1,25 @@
+#ifndef _FLUTTER_TEXTURE_BUFFER_H
+#define _FLUTTER_TEXTURE_BUFFER_H
+
+#include <flutter/method_channel.h>
+#include <flutter/plugin_registrar_windows.h>
+#include <flutter/standard_method_codec.h>
+#include <flutter/texture_registrar.h>
+
+namespace thermion_flutter {
+
+    class FlutterTextureBuffer {
+        public:
+            flutter::TextureVariant GetTexture() {
+                return texture->get();
+            }
+            void RegisterFlutterTextureId(int64_t flutterTextureId);
+            int64_t GetFlutterTextureId();
+        private:
+            int64_t flutterTextureId = -1;
+            std::unique_ptr<flutter::TextureVariant> texture;
+
+    };
+}
+
+#endif

thermion_flutter/thermion_flutter/windows/thermion_flutter_plugin.cpp

@@ -29,7 +29,7 @@
 
 #include "flutter_render_context.h"
 
-#if USE_ANGLE
+#if THERMION_EGL
 #include "egl_context.h"
 #else
 #include "wgl_context.h"
@@ -150,6 +150,18 @@ void ThermionFlutterPlugin::CreateTexture(
   auto top = (uint32_t)round(dTop );
           
   _context->CreateRenderingSurface(width, height, std::move(result), left, top);
+  auto texture = _context->GetActiveTexture();
+
+  auto flutterTextureId = _textureRegistrar->RegisterTexture(texture.GetFlutterTextureId());
+  texture.RegisterFlutterTextureId(flutterTextureId);
+  std::cout << "Registered Flutter texture ID " << flutterTextureId
+            << std::endl;
+
+  std::vector<flutter::EncodableValue> resultList;
+  resultList.push_back(flutter::EncodableValue(flutterTextureId));
+  resultList.push_back(flutter::EncodableValue(glTextureId));
+  resultList.push_back(flutter::EncodableValue((int64_t) nullptr));
+  result->Success(resultList);
 }
 
 void ThermionFlutterPlugin::DestroyTexture(
@@ -180,7 +192,7 @@ void ThermionFlutterPlugin::HandleMethodCall(
     result->Success(flutter::EncodableValue((int64_t)wrapper));
   } else if(methodCall.method_name() == "getSharedContext")  {
     if (!_context) {
-    #ifdef USE_ANGLE
+    #ifdef THERMION_EGL
         _context = std::make_unique<FlutterEGLContext>(_pluginRegistrar, _textureRegistrar);
     #else
         _context = std::make_unique<WGLContext>(_pluginRegistrar, _textureRegistrar);
@@ -214,12 +226,13 @@ void ThermionFlutterPlugin::HandleMethodCall(
     DestroyTexture(methodCall, std::move(result));
   } else if (methodCall.method_name() == "markTextureFrameAvailable") {
      if (_context) {
-          auto flutterTextureId = _context->GetFlutterTextureId();
+          auto texture = context->GetActiveTexture();
+          auto flutterTextureId = texture.GetFlutterTextureId();
           if(flutterTextureId == -1) {
             std::cout << "Bad texture" << std::endl;
             return;
           }
-    #ifdef USE_ANGLE
+    #ifdef THERMION_EGL
         _context->RenderCallback();
     #endif
     #if !WGL_USE_BACKING_WINDOW
@@ -228,11 +241,7 @@ void ThermionFlutterPlugin::HandleMethodCall(
       }
     result->Success(flutter::EncodableValue((int64_t)nullptr));
   } else if (methodCall.method_name() == "getDriverPlatform") {
-#ifdef USE_ANGLE
-    result->Success(flutter::EncodableValue((int64_t)_context->GetPlatform()));
-#else
     result->Success(flutter::EncodableValue((int64_t) nullptr));
-#endif
   } else {
     result->Error("NOT_IMPLEMENTED", "Method is not implemented %s",
                   methodCall.method_name());

thermion_flutter/thermion_flutter/windows/thermion_flutter_plugin.h

@@ -16,7 +16,7 @@
 
 #include "ResourceBuffer.h"
 
-#if USE_ANGLE
+#if THERMION_EGL
 #include "egl_context.h"
 #else
 #include "wgl_context.h"
@@ -59,7 +59,7 @@ public:
   void freeResource(ResourceBuffer rbuf);
 
   private:
-    #ifdef USE_ANGLE
+    #ifdef THERMION_EGL
     std::unique_ptr<FlutterEGLContext> _context = nullptr;
     #else 
     std::unique_ptr<WGLContext> _context = nullptr;