233 lines
8.8 KiB
C++
233 lines
8.8 KiB
C++
#include <llmr/map/tile_data.hpp>
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#include <llmr/style/style.hpp>
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#include <llmr/map/vector_tile.hpp>
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#include <llmr/geometry/fill_buffer.hpp>
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#include <llmr/geometry/line_buffer.hpp>
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#include <llmr/geometry/point_buffer.hpp>
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#include <llmr/geometry/text_buffer.hpp>
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#include <llmr/geometry/elements_buffer.hpp>
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#include <llmr/renderer/fill_bucket.hpp>
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#include <llmr/renderer/line_bucket.hpp>
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#include <llmr/renderer/point_bucket.hpp>
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#include <llmr/renderer/text_bucket.hpp>
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#include <llmr/util/pbf.hpp>
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#include <llmr/util/string.hpp>
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#include <chrono>
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#include <iostream>
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using namespace llmr;
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TileData::TileData(Tile::ID id, const Style& style)
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: id(id),
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state(State::initial),
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fillVertexBuffer(std::make_shared<FillVertexBuffer>()),
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lineVertexBuffer(std::make_shared<LineVertexBuffer>()),
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pointVertexBuffer(std::make_shared<PointVertexBuffer>()),
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textVertexBuffer(std::make_shared<TextVertexBuffer>()),
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triangleElementsBuffer(std::make_shared<TriangleElementsBuffer>()),
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lineElementsBuffer(std::make_shared<LineElementsBuffer>()),
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pointElementsBuffer(std::make_shared<PointElementsBuffer>()),
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style(style) {
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// Initialize tile debug coordinates
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char coord[32];
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snprintf(coord, sizeof(coord), "%d/%d/%d", id.z, id.x, id.y);
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debugFontBuffer.addText(coord, 50, 200, 5);
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}
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TileData::~TileData() {
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cancel();
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}
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const std::string TileData::toString() const {
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return util::sprintf("[tile %d/%d/%d]", id.z, id.x, id.y);
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}
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void TileData::request() {
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state = State::loading;
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// Create http request
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std::string url = util::sprintf(kTileURL,
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id.z, id.x, id.y);
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// Note: Somehow this feels slower than the change to request_http()
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std::weak_ptr<TileData> weak_tile = shared_from_this();
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platform::Request *request = platform::request_http(url, [=](platform::Response& res) {
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std::shared_ptr<TileData> tile = weak_tile.lock();
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if (!tile || tile->state == State::obsolete) {
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// noop. Tile is obsolete and we're now just waiting for the refcount
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// to drop to zero for destruction.
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} else if (res.code == 200) {
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tile->state = State::loaded;
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tile->data.swap(res.body);
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tile->parse();
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} else {
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fprintf(stderr, "tile loading failed\n");
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}
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}, []() {
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platform::restart();
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});
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req = request;
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}
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void TileData::cancel() {
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if (state != State::obsolete) {
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state = State::obsolete;
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platform::cancel_request_http(req);
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}
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}
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bool TileData::parse() {
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if (state != State::loaded) {
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return false;
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}
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try {
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double parse_time_start = platform::time();
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VectorTile tile(pbf((const uint8_t *)data.data(), data.size()));
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parseStyleLayers(tile, style.layers);
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// double parse_time = (platform::time() - parse_time_start) * 1000.0;
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if (state == State::obsolete) {
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// fprintf(stderr, "[%p] parsing [%d/%d/%d] cancelled after %8.3fms\n", this, id.z, id.x, id.y, parse_time);
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} else {
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// fprintf(stderr, "[%p] parsing [%d/%d/%d] took %8.3fms\n", this, id.z, id.x, id.y, parse_time);
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}
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} catch (const std::exception& ex) {
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fprintf(stderr, "[%p] exception [%d/%d/%d]... failed: %s\n", this, id.z, id.x, id.y, ex.what());
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cancel();
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return false;
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}
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if (state == State::obsolete) {
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return false;
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} else {
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state = State::parsed;
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}
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return true;
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}
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void TileData::parseStyleLayers(const VectorTile& tile, const std::vector<LayerDescription>& layers) {
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for (const LayerDescription& layer_desc : layers) {
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// Cancel early when parsing.
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if (state == State::obsolete) {
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return;
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}
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if (layer_desc.child_layer.size()) {
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// This is a layer group.
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// TODO: create framebuffer
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parseStyleLayers(tile, layer_desc.child_layer);
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// TODO: render framebuffer on previous framebuffer
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} else {
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// This is a singular layer. Check if this bucket already exists. If not,
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// parse this bucket.
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auto bucket_it = buckets.find(layer_desc.bucket_name);
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if (bucket_it == buckets.end()) {
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auto bucket_it = style.buckets.find(layer_desc.bucket_name);
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if (bucket_it != style.buckets.end()) {
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// Only create the new bucket if we have an actual specification
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// for it.
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std::shared_ptr<Bucket> bucket = createBucket(tile, bucket_it->second);
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if (bucket) {
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// Bucket creation might fail because the data tile may not
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// contain any data that falls into this bucket.
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buckets[layer_desc.bucket_name] = bucket;
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}
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} else {
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// There is no proper specification for this bucket, even though
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// it is referenced in the stylesheet.
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fprintf(stderr, "Stylesheet specifies bucket %s, but it is not defined\n", layer_desc.bucket_name.c_str());
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}
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}
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}
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}
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}
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std::shared_ptr<Bucket> TileData::createBucket(const VectorTile& tile, const BucketDescription& bucket_desc) {
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auto layer_it = tile.layers.find(bucket_desc.source_layer);
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if (layer_it != tile.layers.end()) {
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const VectorTileLayer& layer = layer_it->second;
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if (bucket_desc.type == BucketType::Fill) {
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return createFillBucket(tile, layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Line) {
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return createLineBucket(tile, layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Point) {
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return createPointBucket(tile, layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Text) {
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return createTextBucket(tile, layer, bucket_desc);
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} else {
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throw std::runtime_error("unknown bucket type");
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}
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} else {
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// The layer specified in the bucket does not exist. Do nothing.
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}
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return nullptr;
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}
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template <class Bucket>
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void TileData::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
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for (pbf feature : filtered_layer) {
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if (state == State::obsolete) return;
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while (feature.next(4)) { // geometry
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pbf geometry_pbf = feature.message();
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if (geometry_pbf) {
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bucket->addGeometry(geometry_pbf);
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}
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}
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}
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}
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std::shared_ptr<Bucket> TileData::createFillBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::shared_ptr<FillBucket> bucket = std::make_shared<FillBucket>(fillVertexBuffer, triangleElementsBuffer, lineElementsBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return state == State::obsolete ? nullptr : bucket;
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}
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std::shared_ptr<Bucket> TileData::createLineBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::shared_ptr<LineBucket> bucket = std::make_shared<LineBucket>(lineVertexBuffer, triangleElementsBuffer, pointElementsBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return state == State::obsolete ? nullptr : bucket;
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}
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std::shared_ptr<Bucket> TileData::createPointBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::shared_ptr<PointBucket> bucket = std::make_shared<PointBucket>(pointVertexBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return state == State::obsolete ? nullptr : bucket;
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}
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std::shared_ptr<Bucket> TileData::createTextBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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// Determine the correct text stack.
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if (!layer.shaping.size()) {
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return nullptr;
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}
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// TODO: currently hardcoded to use the first font stack.
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const std::map<Value, std::vector<VectorTilePlacement>>& shaping = layer.shaping.begin()->second;
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std::vector<const VectorTileFace *> faces;
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for (const std::string& face : layer.faces) {
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auto it = tile.faces.find(face);
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if (it == tile.faces.end()) {
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// This layer references an unknown face.
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return nullptr;
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}
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faces.push_back(&it->second);
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}
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std::shared_ptr<TextBucket> bucket = std::make_shared<TextBucket>(textVertexBuffer, triangleElementsBuffer, bucket_desc);
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FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
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for (const pbf& feature_pbf : filtered_layer) {
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if (state == State::obsolete) return nullptr;
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bucket->addFeature({ feature_pbf, layer }, faces, shaping);
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}
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return bucket;
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}
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