378 lines
12 KiB
C++
378 lines
12 KiB
C++
#include <llmr/map/source.hpp>
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#include <llmr/map/map.hpp>
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#include <llmr/map/transform.hpp>
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#include <llmr/renderer/painter.hpp>
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#include <llmr/util/constants.hpp>
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#include <llmr/util/raster.hpp>
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#include <llmr/util/string.hpp>
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#include <llmr/util/texturepool.hpp>
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#include <llmr/util/vec.hpp>
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#include <llmr/geometry/glyph_atlas.hpp>
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using namespace llmr;
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Source::Source(Map &map, Painter &painter, Texturepool &texturepool,
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const char *url, Source::Type type, std::vector<uint32_t> zooms, uint32_t tile_size,
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uint32_t min_zoom, uint32_t max_zoom, bool enabled)
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: enabled(enabled),
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map(map),
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painter(painter),
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texturepool(texturepool),
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type(type),
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zooms(zooms),
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url(url),
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tile_size(tile_size),
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min_zoom(min_zoom),
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max_zoom(max_zoom) {}
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bool Source::update() {
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return updateTiles();
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}
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void Source::prepare_render(const TransformState &transform, bool is_baselayer) {
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if (!enabled) return;
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uint8_t i = 1;
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for (Tile& tile : tiles) {
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if (tile.data && tile.data->state == TileData::State::parsed) {
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transform.matrixFor(tile.matrix, tile.id);
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matrix::multiply(tile.matrix, painter.projMatrix, tile.matrix);
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tile.clip_id = i++;
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if (is_baselayer) {
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painter.drawClippingMask(tile.matrix, tile.clip_id);
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}
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}
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}
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}
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void Source::render(time animationTime) {
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if (!enabled) return;
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for (const Tile& tile : tiles) {
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if (tile.data && tile.data->state == TileData::State::parsed) {
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if (type == Type::raster) {
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std::shared_ptr<Raster> raster = tile.data->raster;
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if (raster && !raster->textured) {
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raster->setTexturepool(&texturepool);
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raster->beginFadeInAnimation();
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}
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if (raster && raster->needsAnimation()) {
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raster->updateAnimations(animationTime);
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}
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}
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painter.render(tile);
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}
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}
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}
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TileData::State Source::hasTile(const Tile::ID& id) {
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for (const Tile& tile : tiles) {
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if (tile.id == id && tile.data) {
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return tile.data->state;
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}
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}
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return TileData::State::invalid;
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}
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TileData::State Source::addTile(const Tile::ID& id) {
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const TileData::State state = hasTile(id);
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if (state != TileData::State::invalid) {
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return state;
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}
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tiles.emplace_front(id);
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Tile& new_tile = tiles.front();
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// We couldn't find the tile in the list. Create a new one.
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// Try to find the associated TileData object.
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const Tile::ID normalized_id = id.normalized();
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auto it = std::find_if(tile_data.begin(), tile_data.end(), [normalized_id](const std::weak_ptr<TileData>& tile_data) {
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return !tile_data.expired() && tile_data.lock()->id == normalized_id;
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});
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if (it != tile_data.end()) {
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// Create a shared_ptr handle. Note that this might be empty!
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new_tile.data = it->lock();
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}
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if (new_tile.data && new_tile.data->state == TileData::State::obsolete) {
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// Do not consider the tile if it's already obsolete.
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new_tile.data.reset();
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}
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if (!new_tile.data) {
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// If we don't find working tile data, we're just going to load it.
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std::string formed_url;
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if (type == Source::Type::vector) {
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formed_url = util::sprintf<256>(url, normalized_id.z, normalized_id.x, normalized_id.y);
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} else {
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formed_url = util::sprintf<256>(url, normalized_id.z, normalized_id.x, normalized_id.y, (map.getState().getPixelRatio() > 1.0 ? "@2x" : ""));
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}
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new_tile.data = std::make_shared<TileData>(normalized_id, map, formed_url, (type == Source::Type::raster));
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new_tile.data->request();
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tile_data.push_front(new_tile.data);
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}
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return new_tile.data->state;
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}
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/**
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* Recursively find children of the given tile that are already loaded.
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*
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* @param id The tile ID that we should find children for.
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* @param maxCoveringZoom The maximum zoom level of children to look for.
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* @param retain An object that we add the found tiles to.
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*
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* @return boolean Whether the children found completely cover the tile.
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*/
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bool Source::findLoadedChildren(const Tile::ID& id, int32_t maxCoveringZoom, std::forward_list<Tile::ID>& retain) {
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bool complete = true;
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int32_t z = id.z;
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auto ids = id.children(z + 1);
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for (const Tile::ID& child_id : ids) {
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const TileData::State state = hasTile(child_id);
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if (state == TileData::State::parsed) {
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retain.emplace_front(child_id);
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} else {
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complete = false;
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if (z < maxCoveringZoom) {
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// Go further down the hierarchy to find more unloaded children.
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findLoadedChildren(child_id, maxCoveringZoom, retain);
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}
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}
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}
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return complete;
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}
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/**
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* Find a loaded parent of the given tile.
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*
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* @param id The tile ID that we should find children for.
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* @param minCoveringZoom The minimum zoom level of parents to look for.
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* @param retain An object that we add the found tiles to.
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*
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* @return boolean Whether a parent was found.
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*/
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bool Source::findLoadedParent(const Tile::ID& id, int32_t minCoveringZoom, std::forward_list<Tile::ID>& retain) {
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for (int32_t z = id.z - 1; z >= minCoveringZoom; --z) {
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const Tile::ID parent_id = id.parent(z);
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const TileData::State state = hasTile(parent_id);
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if (state == TileData::State::parsed) {
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retain.emplace_front(parent_id);
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return true;
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}
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}
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return false;
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}
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bool Source::updateTiles() {
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bool changed = false;
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// Figure out what tiles we need to load
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int32_t zoom = map.getState().getIntegerZoom();
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if (zoom > max_zoom) zoom = max_zoom;
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if (zoom < min_zoom) zoom = min_zoom;
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int32_t max_covering_zoom = zoom + 1;
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if (max_covering_zoom > max_zoom) max_covering_zoom = max_zoom;
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int32_t min_covering_zoom = zoom - 10;
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if (min_covering_zoom < min_zoom) min_covering_zoom = min_zoom;
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// Map four viewport corners to pixel coordinates
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box box = map.getState().cornersToBox(zoom);
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// Performs a scanline algorithm search that covers the rectangle of the box
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// and sorts them by proximity to the center.
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std::forward_list<Tile::ID> required = covering_tiles(zoom, box);
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// Retain is a list of tiles that we shouldn't delete, even if they are not
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// the most ideal tile for the current viewport. This may include tiles like
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// parent or child tiles that are *already* loaded.
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std::forward_list<Tile::ID> retain(required);
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// Add existing child/parent tiles if the actual tile is not yet loaded
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for (const Tile::ID& id : required) {
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const TileData::State state = addTile(id);
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if (state != TileData::State::parsed) {
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// if (use_raster && (transform.rotating || transform.scaling || transform.panning))
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// break;
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// The tile we require is not yet loaded. Try to find a parent or
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// child tile that we already have.
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// First, try to find existing child tiles that completely cover the
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// missing tile.
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bool complete = findLoadedChildren(id, max_covering_zoom, retain);
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// Then, if there are no complete child tiles, try to find existing
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// parent tiles that completely cover the missing tile.
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if (!complete) {
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findLoadedParent(id, min_covering_zoom, retain);
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}
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}
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if (state == TileData::State::initial) {
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changed = true;
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}
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}
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// Remove tiles that we definitely don't need, i.e. tiles that are not on
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// the required list.
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std::forward_list<Tile::ID> retain_data;
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tiles.remove_if([&retain, &retain_data, &changed](const Tile & tile) {
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bool obsolete = std::find(retain.begin(), retain.end(), tile.id) == retain.end();
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if (obsolete) {
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changed = true;
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} else {
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retain_data.push_front(tile.data->id);
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}
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return obsolete;
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});
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// Sort tiles by zoom level, front to back.
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// We're painting front-to-back, so we want to draw more detailed tiles first
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// before filling in other parts with lower zoom levels.
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tiles.sort([](const Tile & a, const Tile & b) {
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return a.id.z > b.id.z;
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});
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// Remove all the expired pointers from the list.
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tile_data.remove_if([&retain_data](const std::weak_ptr<TileData>& tile_data) {
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const std::shared_ptr<TileData> tile = tile_data.lock();
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if (!tile) {
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return true;
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}
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bool obsolete = std::find(retain_data.begin(), retain_data.end(), tile->id) == retain_data.end();
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if (obsolete) {
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tile->cancel();
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return true;
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} else {
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return false;
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}
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});
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return changed;
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}
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// Taken from polymaps src/Layer.js
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// https://github.com/simplegeo/polymaps/blob/master/src/Layer.js#L333-L383
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struct edge {
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double x0 = 0, y0 = 0;
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double x1 = 0, y1 = 0;
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double dx = 0, dy = 0;
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edge(double x0, double y0, double x1, double y1, double dx, double dy)
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: x0(x0), y0(y0), x1(x1), y1(y1), dx(dx), dy(dy) {}
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};
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typedef const std::function<void(int32_t, int32_t, int32_t, int32_t)> ScanLine;
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// scan-line conversion
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edge _edge(const llmr::vec2<double> a, const llmr::vec2<double> b) {
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if (a.y > b.y) {
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return { b.x, b.y, a.x, a.y, a.x - b.x, a.y - b.y };
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} else {
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return { a.x, a.y, b.x, b.y, b.x - a.x, b.y - a.y };
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}
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}
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// scan-line conversion
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void _scanSpans(edge e0, edge e1, int32_t ymin, int32_t ymax, ScanLine scanLine) {
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double y0 = fmax(ymin, floor(e1.y0)),
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y1 = fmin(ymax, ceil(e1.y1));
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// sort edges by x-coordinate
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if ((e0.x0 == e1.x0 && e0.y0 == e1.y0) ?
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(e0.x0 + e1.dy / e0.dy * e0.dx < e1.x1) :
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(e0.x1 - e1.dy / e0.dy * e0.dx < e1.x0)) {
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std::swap(e0, e1);
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}
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// scan lines!
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double m0 = e0.dx / e0.dy,
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m1 = e1.dx / e1.dy,
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d0 = e0.dx > 0, // use y + 1 to compute x0
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d1 = e1.dx < 0; // use y + 1 to compute x1
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for (int32_t y = y0; y < y1; y++) {
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double x0 = m0 * fmax(0, fmin(e0.dy, y + d0 - e0.y0)) + e0.x0,
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x1 = m1 * fmax(0, fmin(e1.dy, y + d1 - e1.y0)) + e1.x0;
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scanLine(floor(x1), ceil(x0), y, ymax);
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}
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}
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// scan-line conversion
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void _scanTriangle(const llmr::vec2<double> a, const llmr::vec2<double> b, const llmr::vec2<double> c, int32_t ymin, int32_t ymax, ScanLine& scanLine) {
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edge ab = _edge(a, b);
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edge bc = _edge(b, c);
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edge ca = _edge(c, a);
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// sort edges by y-length
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if (ab.dy > bc.dy) { std::swap(ab, bc); }
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if (ab.dy > ca.dy) { std::swap(ab, ca); }
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if (bc.dy > ca.dy) { std::swap(bc, ca); }
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// scan span! scan span!
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if (ab.dy) _scanSpans(ca, ab, ymin, ymax, scanLine);
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if (bc.dy) _scanSpans(ca, bc, ymin, ymax, scanLine);
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}
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double Source::getZoom() const {
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double offset = log(util::tileSize / tile_size) / log(2);
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offset += (map.getState().getPixelRatio() > 1.0 ? 1 :0);
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return map.getState().getZoom() + offset;
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}
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std::forward_list<llmr::Tile::ID> Source::covering_tiles(int32_t zoom, const box& points) {
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int32_t dim = pow(2, zoom);
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std::forward_list<llmr::Tile::ID> tiles;
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bool is_raster = (type == Type::raster);
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double search_zoom = getZoom();
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auto scanLine = [&tiles, zoom, is_raster, search_zoom](int32_t x0, int32_t x1, int32_t y, int32_t ymax) {
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int32_t x;
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if (y >= 0 && y <= ymax) {
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for (x = x0; x < x1; x++) {
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if (is_raster) {
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Tile::ID id = Tile::ID(zoom, x, y);
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auto ids = id.children(search_zoom);
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for (const Tile::ID& child_id : ids) {
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tiles.emplace_front(child_id.z, child_id.x, child_id.y);
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}
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} else {
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tiles.emplace_front(zoom, x, y);
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}
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}
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}
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};
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// Divide the screen up in two triangles and scan each of them:
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// \---+
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// | \ |
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// +---\.
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_scanTriangle(points.tl, points.tr, points.br, 0, dim, scanLine);
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_scanTriangle(points.br, points.bl, points.tl, 0, dim, scanLine);
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const vec2<double>& center = points.center;
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tiles.sort([¢er](const Tile::ID& a, const Tile::ID& b) {
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// Sorts by distance from the box center
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return fabs(a.x - center.x) + fabs(a.y - center.y) <
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fabs(b.x - center.x) + fabs(b.y - center.y);
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});
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tiles.unique();
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return tiles;
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}
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