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)
document.getElementById("body").addEventListener("keydown", mapEvHandler, false);
+ console.log("Events added.");
document.getElementById("copyright").innerHTML =
gMapStyles[gMap.activeMap].copyright;
+ console.log("Init loading tile...");
gLoadingTile = new Image();
- gLoadingTile.src = "style/loading.png";
gLoadingTile.onload = function() {
+ console.log("Loading tile loaded.");
var throwEv = new CustomEvent("prefload-done");
gAction.dispatchEvent(throwEv);
};
+ console.log("Set loading tile...");
+ gLoadingTile.src = "style/loading.png";
}
}
else {
initGL: function() {
// When called from the event listener, the "this" reference doesn't work, so use the object name.
+ console.log("Initializing WebGL...");
if (gMap.gl) {
gMap.gl.viewport(0, 0, gMap.gl.drawingBufferWidth, gMap.gl.drawingBufferHeight);
gMap.gl.clearColor(0.0, 0.0, 0.0, 0.5); // Set clear color to black, fully opaque.
gMap.gl.clear(gMap.gl.COLOR_BUFFER_BIT|gMap.gl.DEPTH_BUFFER_BIT); // Clear the color.
// Create and initialize the shaders.
+ console.log("Create and compile shaders...");
var vertShader = gMap.gl.createShader(gMap.gl.VERTEX_SHADER);
var fragShader = gMap.gl.createShader(gMap.gl.FRAGMENT_SHADER);
gMap.gl.shaderSource(vertShader, gMap.getVertShaderSource());
return null;
}
+ console.log("Create and link shader program...");
gMap.glShaderProgram = gMap.gl.createProgram();
gMap.gl.attachShader(gMap.glShaderProgram, vertShader);
gMap.gl.attachShader(gMap.glShaderProgram, fragShader);
gMap.glTextureCoordAttr = gMap.gl.getAttribLocation(gMap.glShaderProgram, "aTextureCoord");
gMap.glResolutionAttr = gMap.gl.getUniformLocation(gMap.glShaderProgram, "uResolution");
+ console.log("Set up vertex buffer...");
var tileVerticesBuffer = gMap.gl.createBuffer();
gMap.gl.bindBuffer(gMap.gl.ARRAY_BUFFER, tileVerticesBuffer);
// The vertices are the coordinates of the corner points of the square.
gMap.gl.uniform2f(gMap.glResolutionAttr, gGLMapCanvas.width, gGLMapCanvas.height);
// Create a buffer for the position of the rectangle corners.
+ console.log("Set up coord buffer...");
var mapVerticesTextureCoordBuffer = gMap.gl.createBuffer();
gMap.gl.bindBuffer(gMap.gl.ARRAY_BUFFER, mapVerticesTextureCoordBuffer);
gMap.gl.enableVertexAttribArray(gMap.glVertexPositionAttr);
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() {
y: Math.ceil((gMap.pos.y + gMap.baseDim.ht / 2) / gMap.baseDim.tsize) + 1,
z: gMap.pos.z});
console.log("In range: " + tMin.x + "," + tMin.y + "," + tMin.z + " - " + tMax.x + "," + tMax.y + "," + tMax.z);
- for (aTileKey in gMap.glTextures) {
- var keyMatches = aTileKey.match(/([^:]+)::(\d+),(\d+),(\d+)/);
+ for (var tileKey in gMap.glTextures) {
+ var keyMatches = tileKey.match(/([^:]+)::(\d+),(\d+),(\d+)/);
if (keyMatches && keyMatches[1] != "loading") {
var txData = {
style: keyMatches[1],
}
if (delTx) {
// Delete texture from GL and from the array we are holding.
- gMap.gl.deleteTexture(gMap.glTextures[aTileKey]);
- delete gMap.glTextures[aTileKey];
+ gMap.gl.deleteTexture(gMap.glTextures[tileKey]);
+ delete gMap.glTextures[tileKey];
}
}
}
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.