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WebGL MapRenderer inicializaiton with a test (it may fail on computers without WebGL).

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This commit is contained in:
Petr Pridal
2012-06-21 15:51:00 +02:00
parent 1cca6b4069
commit 6ca9112af2
4 changed files with 17 additions and 5 deletions
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9
src/ol/renderer/WebGL.js
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@@ -8,6 +8,7 @@ goog.require('ol.renderer.MapRenderer');
goog.require('ol.layer.Layer');
goog.require('ol.Loc');
goog.require('goog.webgl');
/**
* Initialization of the native WebGL renderer (canvas, context, layers)
@@ -21,13 +22,13 @@ ol.renderer.WebGL = function(target) {
* @private
* @type {!Element}
*/
this.canvas_ = goog.dom.createDom('canvas', 'ol-renderer-webgl-canvas'}); // Suppose to have: style: 'width:100%;height:100%;'
this.canvas_ = goog.dom.createDom('canvas', 'ol-renderer-webgl-canvas'); // Suppose to have: style: 'width:100%;height:100%;'
/**
* @private
* @type {WebGLRenderingContext}
*/
this.gl_ = (canvas.getContext('experimental-webgl', {
this.gl_ = (this.canvas_.getContext('experimental-webgl', {
'alpha': false,
'depth': false,
'antialias': true,
@@ -39,7 +40,7 @@ ol.renderer.WebGL = function(target) {
goog.dom.append(target, this.canvas_);
var clearColor = opt_bgColor || [0, 0, 0];
var clearColor = [0, 0, 0]; // hardcoded background color
gl.clearColor(clearColor[0], clearColor[1], clearColor[2], 1);
gl.disable(goog.webgl.DEPTH_TEST);
gl.disable(goog.webgl.SCISSOR_TEST);
@@ -62,7 +63,7 @@ goog.inherits(ol.renderer.WebGL, ol.renderer.MapRenderer);
* @returns {boolean} This renderer is supported.
*/
ol.renderer.WebGL.isSupported = function() {
return true;
return !goog.isNull( goog.dom.createDom('canvas').getContext('experimental-webgl') );
};
/**