306 lines
9.6 KiB
JavaScript
306 lines
9.6 KiB
JavaScript
// FIXME large resolutions lead to too large framebuffers :-(
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// FIXME animated shaders! check in redraw
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goog.provide('ol.renderer.webgl.TileLayer');
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goog.require('goog.array');
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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.Tile');
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goog.require('ol.TileRange');
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goog.require('ol.TileState');
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goog.require('ol.extent');
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goog.require('ol.layer.TileLayer');
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goog.require('ol.math');
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goog.require('ol.renderer.webgl.Layer');
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goog.require('ol.renderer.webgl.tilelayer.shader');
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goog.require('ol.structs.Buffer');
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/**
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* @constructor
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* @extends {ol.renderer.webgl.Layer}
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* @param {ol.renderer.Map} mapRenderer Map renderer.
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* @param {ol.layer.TileLayer} tileLayer Tile layer.
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*/
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ol.renderer.webgl.TileLayer = 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.renderer.webgl.tilelayer.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.renderer.webgl.tilelayer.shader.Vertex.getInstance();
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/**
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* @private
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* @type {ol.renderer.webgl.tilelayer.shader.Locations}
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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 {ol.structs.Buffer}
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*/
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this.arrayBuffer_ = new ol.structs.Buffer([
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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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]);
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/**
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* @private
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* @type {ol.TileRange}
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*/
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this.renderedTileRange_ = null;
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.renderedFramebufferExtent_ = null;
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};
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goog.inherits(ol.renderer.webgl.TileLayer, ol.renderer.webgl.Layer);
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.TileLayer.prototype.disposeInternal = function() {
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var mapRenderer = this.getWebGLMapRenderer();
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mapRenderer.deleteBuffer(this.arrayBuffer_);
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goog.base(this, 'disposeInternal');
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};
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/**
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* @protected
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* @return {ol.layer.TileLayer} Tile layer.
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*/
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ol.renderer.webgl.TileLayer.prototype.getTileLayer = function() {
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return /** @type {ol.layer.TileLayer} */ (this.getLayer());
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.TileLayer.prototype.handleWebGLContextLost = function() {
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goog.base(this, 'handleWebGLContextLost');
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this.locations_ = null;
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.TileLayer.prototype.renderFrame =
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function(frameState, layerState) {
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var mapRenderer = this.getWebGLMapRenderer();
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var gl = mapRenderer.getGL();
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var view2DState = frameState.view2DState;
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var projection = view2DState.projection;
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var tileLayer = this.getTileLayer();
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var tileSource = tileLayer.getTileSource();
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var tileGrid = tileSource.getTileGrid();
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if (goog.isNull(tileGrid)) {
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tileGrid = ol.tilegrid.getForProjection(projection);
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}
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var z = tileGrid.getZForResolution(view2DState.resolution);
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var tileResolution = tileGrid.getResolution(z);
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var center = view2DState.center;
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var extent;
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if (tileResolution == view2DState.resolution) {
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center = this.snapCenterToPixel(center, tileResolution, frameState.size);
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extent = ol.extent.getForView2DAndSize(
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center, tileResolution, view2DState.rotation, frameState.size);
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} else {
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extent = frameState.extent;
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}
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var tileRange = tileGrid.getTileRangeForExtentAndResolution(
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extent, tileResolution);
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var framebufferExtent;
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if (!goog.isNull(this.renderedTileRange_) &&
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this.renderedTileRange_.equals(tileRange)) {
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framebufferExtent = this.renderedFramebufferExtent_;
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} else {
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var tileRangeSize = tileRange.getSize();
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var tileSize = tileGrid.getTileSize(z);
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var maxDimension = Math.max(
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tileRangeSize.width * tileSize.width,
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tileRangeSize.height * tileSize.height);
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var framebufferDimension = ol.math.roundUpToPowerOfTwo(maxDimension);
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var framebufferExtentDimension = tileResolution * framebufferDimension;
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var origin = tileGrid.getOrigin(z);
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var minX = origin[0] + tileRange.minX * tileSize.width * tileResolution;
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var minY = origin[1] + tileRange.minY * tileSize.height * tileResolution;
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framebufferExtent = [
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minX, minX + framebufferExtentDimension,
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minY, minY + framebufferExtentDimension
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];
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this.bindFramebuffer(frameState, 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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new ol.renderer.webgl.tilelayer.shader.Locations(gl, program);
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}
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mapRenderer.bindBuffer(goog.webgl.ARRAY_BUFFER, this.arrayBuffer_);
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gl.enableVertexAttribArray(this.locations_.a_position);
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gl.vertexAttribPointer(
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this.locations_.a_position, 2, goog.webgl.FLOAT, false, 16, 0);
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gl.enableVertexAttribArray(this.locations_.a_texCoord);
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gl.vertexAttribPointer(
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this.locations_.a_texCoord, 2, goog.webgl.FLOAT, false, 16, 8);
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gl.uniform1i(this.locations_.u_texture, 0);
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/**
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* @type {Object.<number, Object.<string, ol.Tile>>}
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*/
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var tilesToDrawByZ = {};
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tilesToDrawByZ[z] = {};
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var getTileIfLoaded = this.createGetTileIfLoadedFunction(function(tile) {
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return !goog.isNull(tile) && tile.getState() == ol.TileState.LOADED &&
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mapRenderer.isTileTextureLoaded(tile);
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}, tileSource, projection);
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var findLoadedTiles = goog.bind(tileSource.findLoadedTiles, tileSource,
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tilesToDrawByZ, getTileIfLoaded);
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var allTilesLoaded = true;
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var tmpExtent = ol.extent.createEmpty();
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var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
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var childTileRange, fullyLoaded, tile, tileState, x, y;
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for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
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for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
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tile = tileSource.getTile(z, x, y, projection);
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tileState = tile.getState();
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if (tileState == ol.TileState.LOADED) {
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if (mapRenderer.isTileTextureLoaded(tile)) {
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tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;
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continue;
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}
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} else if (tileState == ol.TileState.ERROR ||
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tileState == ol.TileState.EMPTY) {
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continue;
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}
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allTilesLoaded = false;
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fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
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tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
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if (!fullyLoaded) {
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childTileRange = tileGrid.getTileCoordChildTileRange(
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tile.tileCoord, tmpTileRange, tmpExtent);
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if (!goog.isNull(childTileRange)) {
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findLoadedTiles(z + 1, childTileRange);
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}
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}
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}
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}
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/** @type {Array.<number>} */
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var zs = goog.array.map(goog.object.getKeys(tilesToDrawByZ), Number);
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goog.array.sort(zs);
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var u_tileOffset = goog.vec.Vec4.createFloat32();
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var i, ii, sx, sy, tileExtent, tileKey, tilesToDraw, tx, ty;
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for (i = 0, ii = zs.length; i < ii; ++i) {
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tilesToDraw = tilesToDrawByZ[zs[i]];
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for (tileKey in tilesToDraw) {
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tile = tilesToDraw[tileKey];
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tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
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sx = 2 * (tileExtent[1] - tileExtent[0]) / framebufferExtentDimension;
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sy = 2 * (tileExtent[3] - tileExtent[2]) / framebufferExtentDimension;
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tx = 2 * (tileExtent[0] - framebufferExtent[0]) /
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framebufferExtentDimension - 1;
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ty = 2 * (tileExtent[2] - framebufferExtent[2]) /
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framebufferExtentDimension - 1;
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goog.vec.Vec4.setFromValues(u_tileOffset, sx, sy, tx, ty);
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gl.uniform4fv(this.locations_.u_tileOffset, u_tileOffset);
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mapRenderer.bindTileTexture(tile, goog.webgl.LINEAR, goog.webgl.LINEAR);
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gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
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}
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}
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if (allTilesLoaded) {
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this.renderedTileRange_ = tileRange;
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this.renderedFramebufferExtent_ = framebufferExtent;
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} else {
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this.renderedTileRange_ = null;
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this.renderedFramebufferExtent_ = null;
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frameState.animate = true;
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}
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}
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this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
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var tileTextureQueue = mapRenderer.getTileTextureQueue();
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this.manageTilePyramid(
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frameState, tileSource, tileGrid, projection, extent, z,
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tileLayer.getPreload(),
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function(tile) {
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if (tile.getState() == ol.TileState.LOADED &&
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!mapRenderer.isTileTextureLoaded(tile) &&
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!tileTextureQueue.isKeyQueued(tile.getKey())) {
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tileTextureQueue.enqueue([
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tile,
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tileGrid.getTileCoordCenter(tile.tileCoord),
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tileGrid.getResolution(tile.tileCoord.z)
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]);
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}
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}, this);
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this.scheduleExpireCache(frameState, tileSource);
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this.updateLogos(frameState, tileSource);
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var texCoordMatrix = this.texCoordMatrix;
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goog.vec.Mat4.makeIdentity(texCoordMatrix);
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goog.vec.Mat4.translate(texCoordMatrix,
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(center[0] - framebufferExtent[0]) /
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(framebufferExtent[1] - framebufferExtent[0]),
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(center[1] - framebufferExtent[2]) /
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(framebufferExtent[3] - framebufferExtent[2]),
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0);
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goog.vec.Mat4.rotateZ(texCoordMatrix, view2DState.rotation);
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goog.vec.Mat4.scale(texCoordMatrix,
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frameState.size.width * view2DState.resolution /
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(framebufferExtent[1] - framebufferExtent[0]),
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frameState.size.height * view2DState.resolution /
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(framebufferExtent[3] - framebufferExtent[2]),
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1);
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goog.vec.Mat4.translate(texCoordMatrix,
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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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