From 2daa136b95c7536379ec566ca1daf105fade9ea9 Mon Sep 17 00:00:00 2001
From: serso <se.solovyev@gmail.com>
Date: Sat, 20 Sep 2014 14:26:55 +0200
Subject: [PATCH] Function plotter fixes

---
 .../solovyev/android/calculator/plot/GLView.java  | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/android-app/src/main/java/org/solovyev/android/calculator/plot/GLView.java b/android-app/src/main/java/org/solovyev/android/calculator/plot/GLView.java
index 40f46dcf..d2697f7e 100755
--- a/android-app/src/main/java/org/solovyev/android/calculator/plot/GLView.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/plot/GLView.java
@@ -161,10 +161,14 @@ abstract class GLView extends SurfaceView implements SurfaceHolder.Callback {
 		if (hasSurface && !paused) {
 			onDrawFrame(gl);
 			if (!egl.eglSwapBuffers(display, surface)) {
+				paused = true;
 			}
 			if (egl.eglGetError() == EGL11.EGL_CONTEXT_LOST) {
 				paused = true;
 			}
+			if(paused) {
+				reinitGL();
+			}
 			if (looping) {
 				requestDraw();
 			}
@@ -177,13 +181,22 @@ abstract class GLView extends SurfaceView implements SurfaceHolder.Callback {
 	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
 		this.width = width;
 		this.height = height;
-		boolean doInit = !hasSurface && !paused;
+		final boolean hadSurface = hasSurface;
+		boolean doInit = !hadSurface && !paused;
 		hasSurface = true;
 		if (doInit) {
 			initGL();
+		} else if (hadSurface) {
+			reinitGL();
 		}
 	}
 
+	private void reinitGL() {
+		deinitGL();
+		paused = false;
+		initGL();
+	}
+
 	public void surfaceDestroyed(SurfaceHolder holder) {
 		hasSurface = false;
 		deinitGL();