Support imepller in egl renderer (#70)

Author: JSUYA

flutter/shell/platform/tizen/flutter_tizen_engine.cc

@@ -91,7 +91,8 @@ void FlutterTizenEngine::CreateRenderer(
         },
         renderer_.get());
   } else {
-    renderer_ = std::make_unique<TizenRendererEgl>();
+    renderer_ = std::make_unique<TizenRendererEgl>(
+        project_->HasArgument("--enable-impeller"));
   }
 }
 

flutter/shell/platform/tizen/tizen_renderer_egl.cc

@@ -19,7 +19,8 @@
 
 namespace flutter {
 
-TizenRendererEgl::TizenRendererEgl() {}
+TizenRendererEgl::TizenRendererEgl(bool enable_impeller)
+    : enable_impeller_(enable_impeller) {}
 
 TizenRendererEgl::~TizenRendererEgl() {
   DestroySurface();
@@ -144,20 +145,6 @@ void TizenRendererEgl::DestroySurface() {
 }
 
 bool TizenRendererEgl::ChooseEGLConfiguration() {
-  EGLint config_attribs[] = {
-      // clang-format off
-      EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
-      EGL_RED_SIZE,        8,
-      EGL_GREEN_SIZE,      8,
-      EGL_BLUE_SIZE,       8,
-      EGL_ALPHA_SIZE,      EGL_DONT_CARE,
-      EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
-      EGL_SAMPLE_BUFFERS,  EGL_DONT_CARE,
-      EGL_SAMPLES,         EGL_DONT_CARE,
-      EGL_NONE
-      // clang-format on
-  };
-
   if (!eglInitialize(egl_display_, nullptr, nullptr)) {
     PrintEGLError();
     FT_LOG(Error) << "Could not initialize the EGL display.";
@@ -179,12 +166,50 @@ bool TizenRendererEgl::ChooseEGLConfiguration() {
 
   EGLConfig* configs = (EGLConfig*)calloc(config_size, sizeof(EGLConfig));
   EGLint num_config;
-  if (!eglChooseConfig(egl_display_, config_attribs, configs, config_size,
-                       &num_config)) {
-    free(configs);
-    PrintEGLError();
-    FT_LOG(Error) << "No matching configurations found.";
-    return false;
+  if (enable_impeller_) {
+    EGLint impeller_config_attribs[] = {
+        // clang-format off
+        EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
+        EGL_RED_SIZE,        8,
+        EGL_GREEN_SIZE,      8,
+        EGL_BLUE_SIZE,       8,
+        EGL_ALPHA_SIZE,      8,
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+        EGL_SAMPLE_BUFFERS,  1,
+        EGL_SAMPLES,         4,
+        EGL_STENCIL_SIZE,    8,
+        EGL_DEPTH_SIZE,      0,
+        EGL_NONE
+        // clang-format on
+    };
+    if (!eglChooseConfig(egl_display_, impeller_config_attribs, configs,
+                         config_size, &num_config)) {
+      free(configs);
+      PrintEGLError();
+      FT_LOG(Error) << "No matching configurations found.";
+      return false;
+    }
+  } else {
+    EGLint config_attribs[] = {
+        // clang-format off
+        EGL_SURFACE_TYPE,    EGL_WINDOW_BIT,
+        EGL_RED_SIZE,        8,
+        EGL_GREEN_SIZE,      8,
+        EGL_BLUE_SIZE,       8,
+        EGL_ALPHA_SIZE,      EGL_DONT_CARE,
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+        EGL_SAMPLE_BUFFERS,  EGL_DONT_CARE,
+        EGL_SAMPLES,         EGL_DONT_CARE,
+        EGL_NONE
+        // clang-format on
+    };
+    if (!eglChooseConfig(egl_display_, config_attribs, configs, config_size,
+                         &num_config)) {
+      free(configs);
+      PrintEGLError();
+      FT_LOG(Error) << "No matching configurations found.";
+      return false;
+    }
   }
 
   int buffer_size = 32;

flutter/shell/platform/tizen/tizen_renderer_egl.h

@@ -15,7 +15,7 @@ namespace flutter {
 
 class TizenRendererEgl : public TizenRenderer {
  public:
-  explicit TizenRendererEgl();
+  explicit TizenRendererEgl(bool enable_impeller);
 
   virtual ~TizenRendererEgl();
 
@@ -55,6 +55,7 @@ class TizenRendererEgl : public TizenRenderer {
   EGLSurface egl_resource_surface_ = EGL_NO_SURFACE;
 
   std::string egl_extension_str_;
+  bool enable_impeller_;
 };
 
 }  // namespace flutter