rename Tile to TileData

src/map/tile_data.cpp

@@ -0,0 +1,215 @@
+#include <llmr/map/tile_data.hpp>
+
+#include <llmr/style/style.hpp>
+#include <llmr/map/vector_tile.hpp>
+#include <llmr/geometry/fill_buffer.hpp>
+#include <llmr/geometry/line_buffer.hpp>
+#include <llmr/geometry/point_buffer.hpp>
+#include <llmr/geometry/elements_buffer.hpp>
+#include <llmr/renderer/fill_bucket.hpp>
+#include <llmr/renderer/line_bucket.hpp>
+#include <llmr/renderer/point_bucket.hpp>
+#include <llmr/util/pbf.hpp>
+#include <llmr/util/string.hpp>
+
+#include <chrono>
+
+using namespace llmr;
+
+TileData::TileData(Tile::ID id, const Style& style)
+    : id(id),
+      state(initial),
+      fillVertexBuffer(std::make_shared<FillVertexBuffer>()),
+      lineVertexBuffer(std::make_shared<LineVertexBuffer>()),
+      pointVertexBuffer(std::make_shared<PointVertexBuffer>()),
+      triangleElementsBuffer(std::make_shared<TriangleElementsBuffer>()),
+      lineElementsBuffer(std::make_shared<LineElementsBuffer>()),
+      pointElementsBuffer(std::make_shared<PointElementsBuffer>()),
+      style(style) {
+
+    // Initialize tile debug coordinates
+    char coord[32];
+    snprintf(coord, sizeof(coord), "%d/%d/%d", id.z, id.x, id.y);
+    debugFontBuffer.addText(coord, 50, 200, 5);
+}
+
+TileData::~TileData() {
+}
+
+const std::string TileData::toString() const {
+    return util::sprintf("[tile %d/%d/%d]", id.z, id.x, id.y);
+}
+
+void TileData::request() {
+    state = loading;
+
+    // Create http request
+    std::string url = util::sprintf(kTileURL,
+        id.z, id.x, id.y);
+
+    // Note: Somehow this feels slower than the change to request_http()
+    std::shared_ptr<TileData> tile = shared_from_this();
+    platform::Request *request = platform::request_http(url, [=](platform::Response& res) {
+        if (res.code == 200 && tile->state != obsolete) {
+            tile->state = loaded;
+            tile->data.swap(res.body);
+            tile->parse();
+        } else if (tile->state != obsolete) {
+            fprintf(stderr, "tile loading failed\n");
+        }
+    }, []() {
+        platform::restart();
+    });
+    req = request;
+}
+
+void TileData::cancel() {
+    if (state != obsolete) {
+        state = obsolete;
+        platform::cancel_request_http(req);
+    } else {
+        assert((!"logic error? multiple cancelleations"));
+    }
+}
+
+bool TileData::parse() {
+    if (state != loaded) {
+        return false;
+    }
+
+    try {
+        double parse_time_start = platform::time();
+        VectorTile tile(pbf((const uint8_t *)data.data(), data.size()));
+        parseStyleLayers(tile, style.layers);
+        double parse_time = (platform::time() - parse_time_start) * 1000.0;
+        if (state == obsolete) {
+            fprintf(stderr, "[%p] parsing [%d/%d/%d] cancelled after %8.3fms\n", this, id.z, id.x, id.y, parse_time);
+        } else {
+            fprintf(stderr, "[%p] parsing [%d/%d/%d] took %8.3fms\n", this, id.z, id.x, id.y, parse_time);
+        }
+    } catch (const std::exception& ex) {
+        fprintf(stderr, "[%p] exception [%d/%d/%d]... failed: %s\n", this, id.z, id.x, id.y, ex.what());
+        cancel();
+        return false;
+    }
+
+    if (state == obsolete) {
+        return false;
+    } else {
+        state = parsed;
+    }
+
+    return true;
+}
+
+void TileData::parseStyleLayers(const VectorTile& tile, const std::vector<LayerDescription>& layers) {
+    for (const LayerDescription& layer_desc : layers) {
+        // Cancel early when parsing.
+        if (state == obsolete) {
+            return;
+        }
+
+        if (layer_desc.child_layer.size()) {
+            // This is a layer group.
+            // TODO: create framebuffer
+            parseStyleLayers(tile, layer_desc.child_layer);
+            // TODO: render framebuffer on previous framebuffer
+        } else {
+            // This is a singular layer. Check if this bucket already exists. If not,
+            // parse this bucket.
+            auto bucket_it = buckets.find(layer_desc.bucket_name);
+            if (bucket_it == buckets.end()) {
+                auto bucket_it = style.buckets.find(layer_desc.bucket_name);
+                if (bucket_it != style.buckets.end()) {
+                    // Only create the new bucket if we have an actual specification
+                    // for it.
+                    std::shared_ptr<Bucket> bucket = createBucket(tile, bucket_it->second);
+                    if (bucket) {
+                        // Bucket creation might fail because the data tile may not
+                        // contain any data that falls into this bucket.
+                        buckets[layer_desc.bucket_name] = bucket;
+                    }
+                } else {
+                    // There is no proper specification for this bucket, even though
+                    // it is referenced in the stylesheet.
+                    fprintf(stderr, "Stylesheet specifies bucket %s, but it is not defined\n", layer_desc.bucket_name.c_str());
+                }
+            }
+        }
+    }
+}
+
+std::shared_ptr<Bucket> TileData::createBucket(const VectorTile& tile, const BucketDescription& bucket_desc) {
+    auto layer_it = tile.layers.find(bucket_desc.source_layer);
+    if (layer_it != tile.layers.end()) {
+        const VectorTileLayer& layer = layer_it->second;
+        if (bucket_desc.type == BucketType::Fill) {
+            return createFillBucket(layer, bucket_desc);
+        } else if (bucket_desc.type == BucketType::Line) {
+            return createLineBucket(layer, bucket_desc);
+        } else if (bucket_desc.type == BucketType::Point) {
+            return createPointBucket(layer, bucket_desc);
+        } else {
+            // TODO: create other bucket types.
+        }
+    } else {
+        // The layer specified in the bucket does not exist. Do nothing.
+    }
+
+    return nullptr;
+}
+
+std::shared_ptr<Bucket> TileData::createFillBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
+    std::shared_ptr<FillBucket> bucket = std::make_shared<FillBucket>(fillVertexBuffer, triangleElementsBuffer, lineElementsBuffer, bucket_desc);
+
+    FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
+    for (pbf feature : filtered_layer) {
+        if (state == obsolete) return nullptr;
+
+        while (feature.next(4)) { // geometry
+            pbf geometry_pbf = feature.message();
+            if (geometry_pbf) {
+                bucket->addGeometry(geometry_pbf);
+                bucket->tessellate();
+            }
+        }
+    }
+
+    return bucket;
+}
+
+std::shared_ptr<Bucket> TileData::createLineBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
+    std::shared_ptr<LineBucket> bucket = std::make_shared<LineBucket>(lineVertexBuffer, triangleElementsBuffer, pointElementsBuffer, bucket_desc);
+
+    FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
+    for (pbf feature : filtered_layer) {
+        if (state == obsolete) return nullptr;
+
+        while (feature.next(4)) { // geometry
+            pbf geometry_pbf = feature.message();
+            if (geometry_pbf) {
+                bucket->addGeometry(geometry_pbf);
+            }
+        }
+    }
+
+    return bucket;
+}
+
+std::shared_ptr<Bucket> TileData::createPointBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
+    std::shared_ptr<PointBucket> bucket = std::make_shared<PointBucket>(pointVertexBuffer, bucket_desc);
+
+    FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
+    for (pbf feature : filtered_layer) {
+        if (state == obsolete) return nullptr;
+
+        while (feature.next(4)) { // geometry
+            pbf geometry_pbf = feature.message();
+            if (geometry_pbf) {
+                bucket->addGeometry(geometry_pbf);
+            }
+        }
+    }
+
+    return bucket;
+}