Add ContextCreateEvent and ContextDestroyEvent.

include/widget/FramebufferWidget.hpp

@@ -32,6 +32,8 @@ struct FramebufferWidget : Widget {
 	NVGLUframebuffer* getFramebuffer();
 	math::Vec getFramebufferSize();
 	void setScale(math::Vec scale);
+	void onContextCreate(const ContextCreateEvent& e) override;
+	void onContextDestroy(const ContextDestroyEvent& e) override;
 };
 
 

include/widget/Widget.hpp

@@ -452,13 +452,33 @@ struct Widget : WeakBase {
 	virtual void onHide(const HideEvent& e) {
 		recurseEvent(&Widget::onHide, e);
 	}
+
+	/** Occurs after the Window, OpenGL context, and Nanovg are created.
+	Recurses.
+	*/
+	struct ContextCreateEvent : BaseEvent {
+		NVGcontext* vg;
+	};
+	virtual void onContextCreate(const ContextCreateEvent& e) {
+		recurseEvent(&Widget::onContextCreate, e);
+	}
+
+	/** Occurs before the Window, OpenGL context, and Nanovg are destroyed.
+	Recurses.
+	*/
+	struct ContextDestroyEvent : BaseEvent {
+		NVGcontext* vg;
+	};
+	virtual void onContextDestroy(const ContextDestroyEvent& e) {
+		recurseEvent(&Widget::onContextDestroy, e);
+	}
 };
 
 
 } // namespace widget
 
 /** Deprecated Rack v1 event namespace.
-Use `FooEvent` instead of `event::Foo` in new code.
+Use `FooEvent` (defined in widget::Widget) instead of `event::Foo` in new code.
 */
 namespace event {
 using Base = widget::BaseEvent;

src/widget/FramebufferWidget.cpp

@@ -50,7 +50,7 @@ void FramebufferWidget::setDirty(bool dirty) {
 
 
 void FramebufferWidget::onDirty(const DirtyEvent& e) {
-	dirty = true;
+	setDirty();
 	Widget::onDirty(e);
 }
 
@@ -71,7 +71,7 @@ void FramebufferWidget::step() {
 		return;
 
 	// In case we fail drawing the framebuffer, don't try again the next frame, so reset `dirty` here.
-	dirty = false;
+	setDirty(false);
 	NVGcontext* vg = APP->window->vg;
 
 	internal->fbScale = internal->scale;
@@ -186,12 +186,12 @@ void FramebufferWidget::draw(const DrawArgs& args) {
 	if (dirtyOnSubpixelChange && !(math::isNear(internal->offsetF.x, internal->fbOffsetF.x, 0.01f) && math::isNear(internal->offsetF.y, internal->fbOffsetF.y, 0.01f))) {
 		// If drawing to a new subpixel location, rerender in the next frame.
 		// DEBUG("%p dirty subpixel", this);
-		dirty = true;
+		setDirty();
 	}
 	if (!internal->scale.equals(internal->fbScale)) {
 		// If rescaled, rerender in the next frame.
 		// DEBUG("%p dirty scale", this);
-		dirty = true;
+		setDirty();
 	}
 
 	math::Vec scaleRatio = math::Vec(1, 1);
@@ -285,5 +285,18 @@ void FramebufferWidget::setScale(math::Vec scale) {
 }
 
 
+void FramebufferWidget::onContextCreate(const ContextCreateEvent& e) {
+	setDirty();
+	Widget::onContextCreate(e);
+}
+
+
+void FramebufferWidget::onContextDestroy(const ContextDestroyEvent& e) {
+	if (internal->fb)
+		nvgluDeleteFramebuffer(internal->fb);
+	Widget::onContextDestroy(e);
+}
+
+
 } // namespace widget
 } // namespace rack

src/window.cpp

@@ -327,6 +327,11 @@ Window::Window() {
 	// Load default Blendish font
 	uiFont = loadFont(asset::system("res/fonts/DejaVuSans.ttf"));
 	bndSetFont(uiFont->handle);
+
+	if (APP->scene) {
+		widget::Widget::ContextCreateEvent e;
+		APP->scene->onContextCreate(e);
+	}
 }
 
 
@@ -344,6 +349,11 @@ Window::~Window() {
 		settings::windowPos = math::Vec(winX, winY);
 	}
 
+	if (APP->scene) {
+		widget::Widget::ContextDestroyEvent e;
+		APP->scene->onContextDestroy(e);
+	}
+
 #if defined NANOVG_GL2
 	nvgDeleteGL2(vg);
 #elif defined NANOVG_GL3
@@ -422,30 +432,32 @@ void Window::step() {
 	glfwGetWindowSize(win, &winWidth, &winHeight);
 	windowRatio = (float)fbWidth / winWidth;
 
-	// DEBUG("%f %f %d %d", pixelRatio, windowRatio, fbWidth, winWidth);
-	// Resize scene
-	APP->scene->box.size = math::Vec(fbWidth, fbHeight).div(pixelRatio);
-
-	// Step scene
-	APP->scene->step();
-
-	// Render scene
-	bool visible = glfwGetWindowAttrib(win, GLFW_VISIBLE) && !glfwGetWindowAttrib(win, GLFW_ICONIFIED);
-	if (visible) {
-		// Update and render
-		nvgBeginFrame(vg, fbWidth, fbHeight, pixelRatio);
-		nvgScale(vg, pixelRatio, pixelRatio);
-
-		// Draw scene
-		widget::Widget::DrawArgs args;
-		args.vg = vg;
-		args.clipBox = APP->scene->box.zeroPos();
-		APP->scene->draw(args);
-
-		glViewport(0, 0, fbWidth, fbHeight);
-		glClearColor(0.0, 0.0, 0.0, 1.0);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
-		nvgEndFrame(vg);
+	if (APP->scene) {
+		// DEBUG("%f %f %d %d", pixelRatio, windowRatio, fbWidth, winWidth);
+		// Resize scene
+		APP->scene->box.size = math::Vec(fbWidth, fbHeight).div(pixelRatio);
+
+		// Step scene
+		APP->scene->step();
+
+		// Render scene
+		bool visible = glfwGetWindowAttrib(win, GLFW_VISIBLE) && !glfwGetWindowAttrib(win, GLFW_ICONIFIED);
+		if (visible) {
+			// Update and render
+			nvgBeginFrame(vg, fbWidth, fbHeight, pixelRatio);
+			nvgScale(vg, pixelRatio, pixelRatio);
+
+			// Draw scene
+			widget::Widget::DrawArgs args;
+			args.vg = vg;
+			args.clipBox = APP->scene->box.zeroPos();
+			APP->scene->draw(args);
+
+			glViewport(0, 0, fbWidth, fbHeight);
+			glClearColor(0.0, 0.0, 0.0, 1.0);
+			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+			nvgEndFrame(vg);
+		}
 	}
 
 	glfwSwapBuffers(win);

standalone/main.cpp

@@ -223,6 +223,12 @@ int main(int argc, char* argv[]) {
 		INFO("Running window");
 		APP->window->run();
 		INFO("Stopped window");
+		delete APP->window;
+		APP->window = NULL;
+
+		INFO("Re-creating window");
+		APP->window = new Window;
+		APP->window->run();
 	}
 
 	// Destroy context