Merge branch 'master' of linz:/srv/git/lantea

[lantea.git] / js / map.js

diff --git a/js/map.js b/js/map.js
index 926177646f9a2f525f293d423fc3cf521eeef1a4..ff5112a6ed0d02e63397db6a259c1db55e846e87 100644 (file)
--- a/js/map.js
+++ b/js/map.js
@@ -72,11 +72,19 @@ function initMap() {
               gGLMapCanvas.getContext("experimental-webgl", {depth: false});
   }
   catch(e) {}
-  // If we don't have a GL context, give up now
   if (!gMap.gl) {
+    // If we don't have a GL context, give up now
     showGLWarningDialog();
     gMap.gl = null;
   }
+  else {
+    // GL context can be lost at any time, handle that.
+    // See http://www.khronos.org/webgl/wiki/HandlingContextLost
+    gGLMapCanvas.addEventListener("webglcontextlost",
+                                  gMap.handleContextLost, false);
+    gGLMapCanvas.addEventListener("webglcontextrestored",
+                                  gMap.handleContextRestored, false);
+  }
   gTrackCanvas = document.getElementById("track");
   gTrackContext = gTrackCanvas.getContext("2d");
   if (!gMap.activeMap)
@@ -321,8 +329,13 @@ var gMap = {
       gMap.glTxCleanIntervalID = window.setInterval(gMap.cleanTextures, 30 * 1000);
     }
 
-    var throwEv = new CustomEvent("mapinit-done");
-    gAction.dispatchEvent(throwEv);
+    if (!gAppInitDone) {
+      // We may be called when context was lost and destroyed,
+      // only send event when we are in app startup
+      // (gAppInitDone is set to true right after we return this event).
+      var throwEv = new CustomEvent("mapinit-done");
+      gAction.dispatchEvent(throwEv);
+    }
   },
 
   draw: function() {
@@ -512,9 +525,21 @@ var gMap = {
         }
       }
       console.log("Cleaning complete, " + Object.keys(gMap.glTextures).length + " textures left)");
-      //clearInterval(gMap.glTxCleanIntervalID);
     }
   },
+
+  handleContextLost: function(event) {
+    event.preventDefault();
+    // GL context is gone, let's reset everything that depends on it.
+    clearInterval(gMap.glTxCleanIntervalID);
+    gMap.glTextures = {};
+  },
+
+  handleContextRestored: function(event) {
+    // When GL context is back, init GL again and draw.
+    gMap.initGL();
+    gMap.draw();
+  },
 }
 
 // Using scale(x, y) together with drawing old data on scaled canvas would be an improvement for zooming.