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Add hit-detection support for webgl

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This commit is contained in:
tsauerwein
2014-12-18 13:21:20 +01:00
parent 740420468e
commit 3ef61fa1c5
4 changed files with 293 additions and 21 deletions
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190
src/ol/render/webgl/webglreplay.js
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@@ -180,6 +180,13 @@ ol.render.webgl.ImageReplay = function(tolerance, maxExtent) {
*/
this.verticesBuffer_ = null;
/**
* Start indices per feature.
* @type {Array.<Array.<?>>}
* @private
*/
this.startIndexForFeature_ = [];
/**
* @type {number|undefined}
* @private
@@ -377,6 +384,7 @@ ol.render.webgl.ImageReplay.prototype.drawMultiLineStringGeometry =
*/
ol.render.webgl.ImageReplay.prototype.drawMultiPointGeometry =
function(multiPointGeometry, feature) {
this.startIndexForFeature_.push([this.indices_.length, feature]);
var flatCoordinates = multiPointGeometry.getFlatCoordinates();
var stride = multiPointGeometry.getStride();
this.drawCoordinates_(
@@ -396,6 +404,7 @@ ol.render.webgl.ImageReplay.prototype.drawMultiPolygonGeometry =
*/
ol.render.webgl.ImageReplay.prototype.drawPointGeometry =
function(pointGeometry, feature) {
this.startIndexForFeature_.push([this.indices_.length, feature]);
var flatCoordinates = pointGeometry.getFlatCoordinates();
var stride = pointGeometry.getStride();
this.drawCoordinates_(
@@ -503,12 +512,14 @@ ol.render.webgl.ImageReplay.prototype.finish = function(context) {
* @param {number} hue Global hue.
* @param {number} saturation Global saturation.
* @param {Object} skippedFeaturesHash Ids of features to skip.
* @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
* @return {T|undefined} Callback result.
* @template T
*/
ol.render.webgl.ImageReplay.prototype.replay = function(context,
center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash) {
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash,
featureCallback) {
var gl = context.getGL();
// bind the vertices buffer
@@ -609,17 +620,12 @@ ol.render.webgl.ImageReplay.prototype.replay = function(context,
}
// draw!
goog.asserts.assert(this.textures_.length == this.groupIndices_.length);
var i, ii, start;
for (i = 0, ii = this.textures_.length, start = 0; i < ii; ++i) {
gl.bindTexture(goog.webgl.TEXTURE_2D, this.textures_[i]);
var end = this.groupIndices_[i];
var numItems = end - start;
var offsetInBytes = start * (context.hasOESElementIndexUint ? 4 : 2);
var elementType = context.hasOESElementIndexUint ?
goog.webgl.UNSIGNED_INT : goog.webgl.UNSIGNED_SHORT;
gl.drawElements(goog.webgl.TRIANGLES, numItems, elementType, offsetInBytes);
start = end;
var result;
if (!goog.isDef(featureCallback)) {
this.drawReplay_(gl, context);
} else {
// draw feature by feature for the hit-detection
result = this.drawHitDetectionReplay_(gl, context, featureCallback);
}
// disable the vertex attrib arrays
@@ -628,6 +634,79 @@ ol.render.webgl.ImageReplay.prototype.replay = function(context,
gl.disableVertexAttribArray(locations.a_texCoord);
gl.disableVertexAttribArray(locations.a_opacity);
gl.disableVertexAttribArray(locations.a_rotateWithView);
return result;
};
/**
* @private
* @param {WebGLRenderingContext} gl gl.
* @param {ol.webgl.Context} context Context.
*/
ol.render.webgl.ImageReplay.prototype.drawReplay_ =
function(gl, context) {
goog.asserts.assert(this.textures_.length == this.groupIndices_.length);
var elementType = context.hasOESElementIndexUint ?
goog.webgl.UNSIGNED_INT : goog.webgl.UNSIGNED_SHORT;
var elementSize = context.hasOESElementIndexUint ? 4 : 2;
var i, ii, start;
for (i = 0, ii = this.textures_.length, start = 0; i < ii; ++i) {
gl.bindTexture(goog.webgl.TEXTURE_2D, this.textures_[i]);
var end = this.groupIndices_[i];
var numItems = end - start;
var offsetInBytes = start * elementSize;
gl.drawElements(goog.webgl.TRIANGLES, numItems, elementType, offsetInBytes);
start = end;
}
};
/**
* @private
* @param {WebGLRenderingContext} gl gl.
* @param {ol.webgl.Context} context Context.
* @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
* @return {T|undefined} Callback result.
* @template T
*/
ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplay_ =
function(gl, context, featureCallback) {
goog.asserts.assert(this.textures_.length == this.groupIndices_.length);
var elementType = context.hasOESElementIndexUint ?
goog.webgl.UNSIGNED_INT : goog.webgl.UNSIGNED_SHORT;
var elementSize = context.hasOESElementIndexUint ? 4 : 2;
var i, groupStart, groupEnd, numItems, featureInfo, start, end;
var featureIndex = this.startIndexForFeature_.length - 1;
for (i = this.textures_.length - 1; i >= 0; --i) {
gl.bindTexture(goog.webgl.TEXTURE_2D, this.textures_[i]);
groupStart = (i > 0) ? this.groupIndices_[i - 1] : 0;
end = this.groupIndices_[i];
// draw all features for this texture group
while (featureIndex >= 0 &&
this.startIndexForFeature_[featureIndex][0] >= groupStart) {
featureInfo = this.startIndexForFeature_[featureIndex];
start = featureInfo[0];
numItems = end - start;
var offsetInBytes = start * elementSize;
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawElements(
goog.webgl.TRIANGLES, numItems, elementType, offsetInBytes);
var result = featureCallback(/** @type {ol.Feature} */ (featureInfo[1]));
if (result) {
return result;
}
end = start;
featureIndex--;
}
}
return undefined;
};
@@ -788,19 +867,53 @@ ol.render.webgl.ReplayGroup.prototype.isEmpty = function() {
* @param {number} hue Global hue.
* @param {number} saturation Global saturation.
* @param {Object} skippedFeaturesHash Ids of features to skip.
* @return {T|undefined} Callback result.
* @template T
*/
ol.render.webgl.ReplayGroup.prototype.replay = function(context,
center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash) {
var i, ii, replay, result;
for (i = 0, ii = ol.render.REPLAY_ORDER.length; i < ii; ++i) {
replay = this.replays_[ol.render.REPLAY_ORDER[i]];
if (goog.isDef(replay)) {
replay.replay(context,
center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash,
undefined);
}
}
};
/**
* @private
* @param {ol.webgl.Context} context Context.
* @param {ol.Coordinate} center Center.
* @param {number} resolution Resolution.
* @param {number} rotation Rotation.
* @param {ol.Size} size Size.
* @param {number} pixelRatio Pixel ratio.
* @param {number} opacity Global opacity.
* @param {number} brightness Global brightness.
* @param {number} contrast Global contrast.
* @param {number} hue Global hue.
* @param {number} saturation Global saturation.
* @param {Object} skippedFeaturesHash Ids of features to skip.
* @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
* @return {T|undefined} Callback result.
* @template T
*/
ol.render.webgl.ReplayGroup.prototype.replayHitDetection_ = function(context,
center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash,
featureCallback) {
var i, replay, result;
for (i = ol.render.REPLAY_ORDER.length - 1; i >= 0; --i) {
replay = this.replays_[ol.render.REPLAY_ORDER[i]];
if (goog.isDef(replay)) {
result = replay.replay(context,
center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash);
opacity, brightness, contrast, hue, saturation,
skippedFeaturesHash, featureCallback);
if (result) {
return result;
}
@@ -810,6 +923,53 @@ ol.render.webgl.ReplayGroup.prototype.replay = function(context,
};
/**
* @param {ol.webgl.Context} context Context.
* @param {ol.Coordinate} center Center.
* @param {number} resolution Resolution.
* @param {number} rotation Rotation.
* @param {ol.Size} size Size.
* @param {number} pixelRatio Pixel ratio.
* @param {number} opacity Global opacity.
* @param {number} brightness Global brightness.
* @param {number} contrast Global contrast.
* @param {number} hue Global hue.
* @param {number} saturation Global saturation.
* @param {Object} skippedFeaturesHash Ids of features to skip.
* @param {ol.Coordinate} coordinate Coordinate.
* @param {function(ol.Feature): T|undefined} callback Feature callback.
* @return {T|undefined} Callback result.
* @template T
*/
ol.render.webgl.ReplayGroup.prototype.forEachGeometryAtPixel = function(
context, center, resolution, rotation, size, pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash,
coordinate, callback) {
var gl = context.getGL();
gl.bindFramebuffer(
gl.FRAMEBUFFER, context.getHitDetectionFramebuffer());
return this.replayHitDetection_(context,
coordinate, resolution, rotation, [1, 1], pixelRatio,
opacity, brightness, contrast, hue, saturation, skippedFeaturesHash,
/**
* @param {ol.Feature} feature Feature.
* @return {?} Callback result.
*/
function(feature) {
var imageData = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, imageData);
if (imageData[3] > 0) {
var result = callback(feature);
if (result) {
return result;
}
}
});
};
/**
* @const
* @private