455 lines
13 KiB
JavaScript
455 lines
13 KiB
JavaScript
// FIXME large resolutions lead to too large framebuffers :-(
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// FIXME animated shaders! check in redraw
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// FIXME defer texture uploads
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goog.provide('ol.webgl.TileLayerRenderer');
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goog.provide('ol.webgl.tilelayerrenderer');
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goog.provide('ol.webgl.tilelayerrenderer.shader.Fragment');
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goog.provide('ol.webgl.tilelayerrenderer.shader.Vertex');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.debug.Logger');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('goog.vec.Mat4');
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goog.require('goog.vec.Vec4');
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goog.require('goog.webgl');
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goog.require('ol.Coordinate');
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goog.require('ol.MapEventType');
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goog.require('ol.Size');
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goog.require('ol.TileLayer');
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goog.require('ol.TileState');
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goog.require('ol.webgl.LayerRenderer');
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goog.require('ol.webgl.shader.Fragment');
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goog.require('ol.webgl.shader.Vertex');
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if (goog.DEBUG) {
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ol.webgl.tilelayerrenderer.logger =
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goog.debug.Logger.getLogger('ol.webgl.tilelayerrenderer');
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}
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/**
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* @constructor
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* @extends {ol.webgl.shader.Fragment}
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*/
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ol.webgl.tilelayerrenderer.shader.Fragment = function() {
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goog.base(this, [
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'precision mediump float;',
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'',
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'uniform sampler2D uTexture;',
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'',
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'varying vec2 vTexCoord;',
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'',
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'void main(void) {',
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' gl_FragColor = texture2D(uTexture, vTexCoord);',
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'}'
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].join('\n'));
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};
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goog.inherits(
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ol.webgl.tilelayerrenderer.shader.Fragment, ol.webgl.shader.Fragment);
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goog.addSingletonGetter(ol.webgl.tilelayerrenderer.shader.Fragment);
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/**
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* @constructor
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* @extends {ol.webgl.shader.Vertex}
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*/
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ol.webgl.tilelayerrenderer.shader.Vertex = function() {
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goog.base(this, [
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'attribute vec2 aPosition;',
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'attribute vec2 aTexCoord;',
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'',
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'varying vec2 vTexCoord;',
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'',
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'uniform vec4 uTileOffset;',
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'',
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'void main(void) {',
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' gl_Position.xy = aPosition * uTileOffset.xy + uTileOffset.zw;',
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' gl_Position.z = 0.;',
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' gl_Position.w = 1.;',
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' vTexCoord = aTexCoord;',
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'}'
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].join('\n'));
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};
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goog.inherits(
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ol.webgl.tilelayerrenderer.shader.Vertex, ol.webgl.shader.Vertex);
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goog.addSingletonGetter(ol.webgl.tilelayerrenderer.shader.Vertex);
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/**
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* @constructor
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* @extends {ol.webgl.LayerRenderer}
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* @param {ol.MapRenderer} mapRenderer Map renderer.
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* @param {ol.TileLayer} tileLayer Tile layer.
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*/
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ol.webgl.TileLayerRenderer = function(mapRenderer, tileLayer) {
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goog.base(this, mapRenderer, tileLayer);
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/**
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* @private
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* @type {ol.webgl.shader.Fragment}
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*/
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this.fragmentShader_ =
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ol.webgl.tilelayerrenderer.shader.Fragment.getInstance();
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/**
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* @private
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* @type {ol.webgl.shader.Vertex}
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*/
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this.vertexShader_ = ol.webgl.tilelayerrenderer.shader.Vertex.getInstance();
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/**
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* @private
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* @type {{aPosition: number,
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* aTexCoord: number,
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* uTileOffset: WebGLUniformLocation,
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* uTexture: WebGLUniformLocation}|null}
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*/
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this.locations_ = null;
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/**
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* @private
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* @type {WebGLBuffer}
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*/
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this.arrayBuffer_ = null;
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/**
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* @private
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* @type {WebGLTexture}
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*/
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this.texture_ = null;
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/**
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* @private
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* @type {WebGLFramebuffer}
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*/
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this.framebuffer_ = null;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.framebufferDimension_ = undefined;
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/**
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* @private
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* @type {Object.<number, number>}
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*/
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this.tileChangeListenerKeys_ = {};
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/**
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* @private
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* @type {goog.vec.Mat4.AnyType}
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*/
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this.matrix_ = goog.vec.Mat4.createNumber();
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};
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goog.inherits(ol.webgl.TileLayerRenderer, ol.webgl.LayerRenderer);
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/**
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* @param {number} framebufferDimension Framebuffer dimension.
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* @private
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*/
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ol.webgl.TileLayerRenderer.prototype.bindFramebuffer_ =
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function(framebufferDimension) {
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var mapRenderer = this.getMapRenderer();
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var gl = mapRenderer.getGL();
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if (!goog.isDef(this.framebufferDimension_) ||
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this.framebufferDimension_ != framebufferDimension) {
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if (goog.DEBUG) {
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ol.webgl.tilelayerrenderer.logger.info('re-sizing framebuffer');
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}
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if (ol.webgl.FREE_RESOURCES_IMMEDIATELY) {
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if (goog.DEBUG) {
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ol.webgl.tilelayerrenderer.logger.info('freeing WebGL resources');
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}
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gl.deleteFramebuffer(this.framebuffer_);
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gl.deleteTexture(this.texture_);
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} else {
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var map = this.getMap();
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goog.events.listenOnce(
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map,
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ol.MapEventType.POST_RENDER,
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goog.partial(function(gl, framebuffer, texture) {
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if (goog.DEBUG) {
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ol.webgl.tilelayerrenderer.logger.info(
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'freeing WebGL resources on postrender');
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}
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gl.deleteFramebuffer(framebuffer);
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gl.deleteTexture(texture);
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}, gl, this.framebuffer_, this.texture_));
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}
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var texture = gl.createTexture();
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gl.bindTexture(goog.webgl.TEXTURE_2D, texture);
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gl.texImage2D(goog.webgl.TEXTURE_2D, 0, goog.webgl.RGBA,
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framebufferDimension, framebufferDimension, 0, goog.webgl.RGBA,
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goog.webgl.UNSIGNED_BYTE, null);
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gl.texParameteri(goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MAG_FILTER,
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goog.webgl.LINEAR);
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gl.texParameteri(goog.webgl.TEXTURE_2D, goog.webgl.TEXTURE_MIN_FILTER,
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goog.webgl.LINEAR);
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var framebuffer = gl.createFramebuffer();
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gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, framebuffer);
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gl.framebufferTexture2D(goog.webgl.FRAMEBUFFER,
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goog.webgl.COLOR_ATTACHMENT0, goog.webgl.TEXTURE_2D, texture, 0);
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this.texture_ = texture;
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this.framebuffer_ = framebuffer;
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this.framebufferDimension_ = framebufferDimension;
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} else {
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gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, this.framebuffer_);
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}
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};
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/**
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* @protected
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*/
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ol.webgl.TileLayerRenderer.prototype.disposeInternal = function() {
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var mapRenderer = this.getMapRenderer();
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var gl = mapRenderer.getGL();
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if (!gl.isContextLost()) {
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gl.deleteBuffer(this.arrayBuffer_);
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gl.deleteFramebuffer(this.framebuffer_);
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gl.deleteTexture(this.texture_);
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}
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goog.base(this, 'disposeInternal');
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};
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/**
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* @return {ol.TileLayer} Layer.
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* @override
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*/
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ol.webgl.TileLayerRenderer.prototype.getLayer = function() {
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return /** @type {ol.TileLayer} */ goog.base(this, 'getLayer');
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};
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/**
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* @inheritDoc
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*/
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ol.webgl.TileLayerRenderer.prototype.getMatrix = function() {
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return this.matrix_;
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};
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/**
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* @inheritDoc
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*/
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ol.webgl.TileLayerRenderer.prototype.getTexture = function() {
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return this.texture_;
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};
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/**
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* @protected
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*/
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ol.webgl.TileLayerRenderer.prototype.handleTileChange = function() {
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this.dispatchChangeEvent();
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};
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/**
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*/
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ol.webgl.TileLayerRenderer.prototype.handleWebGLContextLost = function() {
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this.locations_ = null;
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this.arrayBuffer_ = null;
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this.texture_ = null;
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this.framebuffer_ = null;
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this.framebufferDimension_ = undefined;
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};
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/**
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* @inheritDoc
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*/
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ol.webgl.TileLayerRenderer.prototype.render = function() {
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var mapRenderer = this.getMapRenderer();
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var map = this.getMap();
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var gl = mapRenderer.getGL();
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goog.asserts.assert(map.isDef());
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var mapCenter = map.getCenter();
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var mapExtent = map.getExtent();
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var mapResolution = /** @type {number} */ map.getResolution();
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var mapRotatedExtent = map.getRotatedExtent();
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var mapRotation = map.getRotation();
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var tileLayer = this.getLayer();
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var tileStore = tileLayer.getStore();
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var tileGrid = tileStore.getTileGrid();
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var z = tileGrid.getZForResolution(mapResolution);
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var tileResolution = tileGrid.getResolution(z);
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var tileBounds = tileGrid.getTileBoundsForExtentAndResolution(
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mapRotatedExtent, tileResolution);
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var tileBoundsSize = tileBounds.getSize();
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var tileSize = tileGrid.getTileSize();
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var maxDimension = Math.max(
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tileBoundsSize.width * tileSize.width,
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tileBoundsSize.height * tileSize.height);
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var framebufferDimension =
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Math.pow(2, Math.ceil(Math.log(maxDimension) / Math.log(2)));
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var framebufferExtentSize = new ol.Size(
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tileResolution * framebufferDimension,
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tileResolution * framebufferDimension);
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var origin = tileGrid.getOrigin(z);
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var minX = origin.x + tileBounds.minX * tileSize.width * tileResolution;
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var minY = origin.y + tileBounds.minY * tileSize.height * tileResolution;
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var framebufferExtent = new ol.Extent(
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minX,
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minY,
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minX + framebufferExtentSize.width,
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minY + framebufferExtentSize.height);
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this.bindFramebuffer_(framebufferDimension);
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gl.viewport(0, 0, framebufferDimension, framebufferDimension);
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gl.clearColor(0, 0, 0, 0);
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gl.clear(goog.webgl.COLOR_BUFFER_BIT);
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gl.disable(goog.webgl.BLEND);
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var program = mapRenderer.getProgram(
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this.fragmentShader_, this.vertexShader_);
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gl.useProgram(program);
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if (goog.isNull(this.locations_)) {
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this.locations_ = {
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aPosition: gl.getAttribLocation(program, 'aPosition'),
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aTexCoord: gl.getAttribLocation(program, 'aTexCoord'),
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uTileOffset: gl.getUniformLocation(program, 'uTileOffset'),
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uTexture: gl.getUniformLocation(program, 'uTexture')
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};
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}
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if (goog.isNull(this.arrayBuffer_)) {
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var arrayBuffer = gl.createBuffer();
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gl.bindBuffer(goog.webgl.ARRAY_BUFFER, arrayBuffer);
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gl.bufferData(goog.webgl.ARRAY_BUFFER, new Float32Array([
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0, 0, 0, 1,
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1, 0, 1, 1,
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0, 1, 0, 0,
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1, 1, 1, 0
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]), goog.webgl.STATIC_DRAW);
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this.arrayBuffer_ = arrayBuffer;
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} else {
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gl.bindBuffer(goog.webgl.ARRAY_BUFFER, this.arrayBuffer_);
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}
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gl.enableVertexAttribArray(this.locations_.aPosition);
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gl.vertexAttribPointer(
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this.locations_.aPosition, 2, goog.webgl.FLOAT, false, 16, 0);
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gl.enableVertexAttribArray(this.locations_.aTexCoord);
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gl.vertexAttribPointer(
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this.locations_.aTexCoord, 2, goog.webgl.FLOAT, false, 16, 8);
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gl.uniform1i(this.locations_.uTexture, 0);
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/**
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* @type {Object.<number, Object.<string, ol.TileCoord>>}
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*/
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var tilesToDrawByZ = {};
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tilesToDrawByZ[z] = {};
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tileBounds.forEachTileCoord(z, function(tileCoord) {
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var tile = tileStore.getTile(tileCoord);
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if (goog.isNull(tile)) {
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} else if (tile.getState() == ol.TileState.LOADED) {
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tilesToDrawByZ[z][tileCoord.toString()] = tile;
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} else {
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var tileKey = goog.getUid(tile);
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if (!(tileKey in this.tileChangeListenerKeys_)) {
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tile.load();
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// FIXME will need to handle aborts as well
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this.tileChangeListenerKeys_[tileKey] = goog.events.listen(tile,
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goog.events.EventType.CHANGE, this.handleTileChange, false, this);
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}
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// FIXME this could be more efficient about filling partial holes
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tileGrid.forEachTileCoordParentTileBounds(
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tileCoord,
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function(z, tileBounds) {
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var fullyCovered = true;
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tileBounds.forEachTileCoord(z, function(tileCoord) {
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var tileCoordKey = tileCoord.toString();
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if (tilesToDrawByZ[z] && tilesToDrawByZ[z][tileCoordKey]) {
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return;
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}
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var tile = tileStore.getTile(tileCoord);
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if (!goog.isNull(tile) &&
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tile.getState() == ol.TileState.LOADED) {
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if (!tilesToDrawByZ[z]) {
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tilesToDrawByZ[z] = {};
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}
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tilesToDrawByZ[z][tileCoordKey] = tile;
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} else {
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fullyCovered = false;
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}
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});
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return fullyCovered;
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});
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}
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}, this);
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var zs = goog.object.getKeys(tilesToDrawByZ);
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goog.array.sort(zs);
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var uTileOffset = goog.vec.Vec4.createFloat32();
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goog.array.forEach(zs, function(z) {
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goog.object.forEach(tilesToDrawByZ[z], function(tile) {
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var tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord);
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var sx = 2 * tileExtent.getWidth() / framebufferExtentSize.width;
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var sy = 2 * tileExtent.getHeight() / framebufferExtentSize.height;
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var tx = 2 * (tileExtent.minX - framebufferExtent.minX) /
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framebufferExtentSize.width - 1;
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var ty = 2 * (tileExtent.minY - framebufferExtent.minY) /
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framebufferExtentSize.height - 1;
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goog.vec.Vec4.setFromValues(uTileOffset, sx, sy, tx, ty);
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gl.uniform4fv(this.locations_.uTileOffset, uTileOffset);
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mapRenderer.bindImageTexture(
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tile.getImage(), goog.webgl.LINEAR, goog.webgl.LINEAR);
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gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
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}, this);
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}, this);
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goog.vec.Mat4.makeIdentity(this.matrix_);
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goog.vec.Mat4.translate(this.matrix_,
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(mapCenter.x - framebufferExtent.minX) /
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(framebufferExtent.maxX - framebufferExtent.minX),
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(mapCenter.y - framebufferExtent.minY) /
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(framebufferExtent.maxY - framebufferExtent.minY),
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0);
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goog.vec.Mat4.scale(this.matrix_,
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(mapExtent.maxX - mapExtent.minX) /
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(framebufferExtent.maxX - framebufferExtent.minX),
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(mapExtent.maxY - mapExtent.minY) /
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(framebufferExtent.maxY - framebufferExtent.minY),
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1);
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if (goog.isDef(mapRotation)) {
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goog.vec.Mat4.rotate(this.matrix_,
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mapRotation,
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0,
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0,
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1);
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}
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goog.vec.Mat4.translate(this.matrix_,
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-0.5,
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-0.5,
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0);
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};
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