From 350f7a435713ec397f9a2ce321ca30de1551d796 Mon Sep 17 00:00:00 2001
From: Hermet Park <hermet@lottiefiles.com>
Date: Sun, 14 Jul 2024 11:58:00 +0900
Subject: [PATCH] examples: ++exception handling

Added handling for engine initialization failure.
---
 examples/Example.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/examples/Example.h b/examples/Example.h
index 8f7199f1..0ddc651c 100644
--- a/examples/Example.h
+++ b/examples/Example.h
@@ -122,8 +122,6 @@ struct Example
 
 struct Window
 {
-    static Window* instance;
-
     SDL_Window* window = nullptr;
 
     tvg::Canvas* canvas = nullptr;
@@ -134,6 +132,7 @@ struct Window
 
     bool needResize = false;
     bool needDraw = false;
+    bool initialized = false;
     bool print = false;
 
     Window(tvg::CanvasEngine engine, Example* example, uint32_t width, uint32_t height, uint32_t threadsCnt)
@@ -148,7 +147,7 @@ struct Window
         this->width = width;
         this->height = height;
         this->example = example;
-        this->instance = this;
+        this->initialized = true;
     }
 
     virtual ~Window()
@@ -254,8 +253,6 @@ struct Window
     virtual void refresh() {}
 };
 
-Window* Window::instance = nullptr;
-
 
 /************************************************************************/
 /* SwCanvas Window Code                                                 */
@@ -267,6 +264,8 @@ struct SwWindow : Window
 
     SwWindow(Example* example, uint32_t width, uint32_t height, uint32_t threadsCnt) : Window(tvg::CanvasEngine::Sw, example, width, height, threadsCnt)
     {
+        if (!initialized) return;
+
         window = SDL_CreateWindow("ThorVG Example (Software)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_HIDDEN | SDL_WINDOW_RESIZABLE);
 
         //Create a Canvas
@@ -308,6 +307,8 @@ struct GlWindow : Window
 
     GlWindow(Example* example, uint32_t width, uint32_t height, uint32_t threadsCnt) : Window(tvg::CanvasEngine::Gl, example, width, height, threadsCnt)
     {
+        if (!initialized) return;
+
 #ifdef THORVG_GL_TARGET_GLES
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
@@ -364,6 +365,8 @@ struct WgWindow : Window
 
     WgWindow(Example* example, uint32_t width, uint32_t height, uint32_t threadsCnt) : Window(tvg::CanvasEngine::Wg, example, width, height, threadsCnt)
     {
+        if (!initialized) return;
+
         window = SDL_CreateWindow("ThorVG Example (WebGPU)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_HIDDEN);
 
         //Here we create our WebGPU surface from the window!