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Eliminate overdraw with a nice little trick

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This commit is contained in:
GaborFarkas
2016-06-26 22:50:10 +02:00
parent c9c970303f
commit 249084dcd4
1 changed files with 12 additions and 0 deletions
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12
src/ol/render/webgl/imagereplay/index.js
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@@ -1397,12 +1397,24 @@ ol.render.webgl.LineStringReplay.prototype.setUpProgram_ = function(gl, context,
* @param {boolean} hitDetection Hit detection mode. * @param {boolean} hitDetection Hit detection mode.
*/ */
ol.render.webgl.LineStringReplay.prototype.drawReplay_ = function(gl, context, skippedFeaturesHash, hitDetection) { ol.render.webgl.LineStringReplay.prototype.drawReplay_ = function(gl, context, skippedFeaturesHash, hitDetection) {
//Save GL parameters.
var tmpDepthFunc = gl.getParameter(gl.DEPTH_FUNC);
var tmpDepthMask = gl.getParameter(gl.DEPTH_WRITEMASK);
gl.enable(gl.DEPTH_TEST);
gl.depthMask(true);
gl.depthFunc(gl.NOTEQUAL);
if (!goog.object.isEmpty(skippedFeaturesHash)) { if (!goog.object.isEmpty(skippedFeaturesHash)) {
// TODO: draw by blocks to skip features // TODO: draw by blocks to skip features
} else { } else {
var end = this.startIndices_[this.startIndices_.length - 1]; var end = this.startIndices_[this.startIndices_.length - 1];
this.drawElements_(gl, context, 0, end); this.drawElements_(gl, context, 0, end);
} }
gl.clear(gl.DEPTH_BUFFER_BIT);
gl.disable(gl.DEPTH_TEST);
//Restore GL parameters.
gl.depthMask(tmpDepthMask);
gl.depthFunc(tmpDepthFunc);
}; };
/** /**