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#include <mbgl/renderer/buckets/fill_extrusion_bucket.hpp>
#include <mbgl/programs/fill_extrusion_program.hpp>
#include <mbgl/renderer/bucket_parameters.hpp>
#include <mbgl/style/layers/fill_extrusion_layer_impl.hpp>
#include <mbgl/renderer/layers/render_fill_extrusion_layer.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/util/constants.hpp>
#include <mapbox/earcut.hpp>
#include <cassert>
namespace mapbox {
namespace util {
template <>
struct nth<0, mbgl::GeometryCoordinate> {
static int64_t get(const mbgl::GeometryCoordinate& t) {
return t.x;
};
};
template <>
struct nth<1, mbgl::GeometryCoordinate> {
static int64_t get(const mbgl::GeometryCoordinate& t) {
return t.y;
};
};
} // namespace util
} // namespace mapbox
namespace mbgl {
using namespace style;
struct GeometryTooLongException : std::exception {};
FillExtrusionBucket::FillExtrusionBucket(const FillExtrusionBucket::PossiblyEvaluatedLayoutProperties&,
const std::map<std::string, Immutable<style::LayerProperties>>& layerPaintProperties,
const float zoom,
const uint32_t) {
for (const auto& pair : layerPaintProperties) {
paintPropertyBinders.emplace(
std::piecewise_construct,
std::forward_as_tuple(pair.first),
std::forward_as_tuple(
getEvaluated<FillExtrusionLayerProperties>(pair.second),
zoom));
}
}
FillExtrusionBucket::~FillExtrusionBucket() = default;
void FillExtrusionBucket::addFeature(const GeometryTileFeature& feature,
const GeometryCollection& geometry,
const ImagePositions& patternPositions,
const PatternLayerMap& patternDependencies) {
for (auto& polygon : classifyRings(geometry)) {
// Optimize polygons with many interior rings for earcut tesselation.
limitHoles(polygon, 500);
std::size_t totalVertices = 0;
for (const auto& ring : polygon) {
totalVertices += ring.size();
if (totalVertices > std::numeric_limits<uint16_t>::max())
throw GeometryTooLongException();
}
if (totalVertices == 0) continue;
std::vector<uint32_t> flatIndices;
flatIndices.reserve(totalVertices);
std::size_t startVertices = vertices.elements();
if (triangleSegments.empty() ||
triangleSegments.back().vertexLength + (5 * (totalVertices - 1) + 1) >
std::numeric_limits<uint16_t>::max()) {
triangleSegments.emplace_back(startVertices, triangles.elements());
}
auto& triangleSegment = triangleSegments.back();
assert(triangleSegment.vertexLength <= std::numeric_limits<uint16_t>::max());
uint16_t triangleIndex = triangleSegment.vertexLength;
assert(triangleIndex + (5 * (totalVertices - 1) + 1) <=
std::numeric_limits<uint16_t>::max());
for (const auto& ring : polygon) {
std::size_t nVertices = ring.size();
if (nVertices == 0)
continue;
std::size_t edgeDistance = 0;
for (uint32_t i = 0; i < nVertices; i++) {
const auto& p1 = ring[i];
vertices.emplace_back(
FillExtrusionProgram::layoutVertex(p1, 0, 0, 1, 1, edgeDistance));
flatIndices.emplace_back(triangleIndex);
triangleIndex++;
if (i != 0) {
const auto& p2 = ring[i - 1];
const auto d1 = convertPoint<double>(p1);
const auto d2 = convertPoint<double>(p2);
const Point<double> perp = util::unit(util::perp(d1 - d2));
const auto dist = util::dist<int16_t>(d1, d2);
if (edgeDistance + dist > std::numeric_limits<int16_t>::max()) {
edgeDistance = 0;
}
vertices.emplace_back(
FillExtrusionProgram::layoutVertex(p1, perp.x, perp.y, 0, 0, edgeDistance));
vertices.emplace_back(
FillExtrusionProgram::layoutVertex(p1, perp.x, perp.y, 0, 1, edgeDistance));
edgeDistance += dist;
vertices.emplace_back(
FillExtrusionProgram::layoutVertex(p2, perp.x, perp.y, 0, 0, edgeDistance));
vertices.emplace_back(
FillExtrusionProgram::layoutVertex(p2, perp.x, perp.y, 0, 1, edgeDistance));
// ┌──────┐
// │ 0 1 │ Counter-Clockwise winding order.
// │ │ Triangle 1: 0 => 2 => 1
// │ 2 3 │ Triangle 2: 1 => 2 => 3
// └──────┘
triangles.emplace_back(triangleIndex, triangleIndex + 2, triangleIndex + 1);
triangles.emplace_back(triangleIndex + 1, triangleIndex + 2, triangleIndex + 3);
triangleIndex += 4;
triangleSegment.vertexLength += 4;
triangleSegment.indexLength += 6;
}
}
}
std::vector<uint32_t> indices = mapbox::earcut(polygon);
std::size_t nIndices = indices.size();
assert(nIndices % 3 == 0);
for (uint32_t i = 0; i < nIndices; i += 3) {
// Counter-Clockwise winding order.
triangles.emplace_back(flatIndices[indices[i]], flatIndices[indices[i + 2]],
flatIndices[indices[i + 1]]);
}
triangleSegment.vertexLength += totalVertices;
triangleSegment.indexLength += nIndices;
}
for (auto& pair : paintPropertyBinders) {
const auto it = patternDependencies.find(pair.first);
if (it != patternDependencies.end()){
pair.second.populateVertexVectors(feature, vertices.elements(), patternPositions, it->second);
} else {
pair.second.populateVertexVectors(feature, vertices.elements(), patternPositions, {});
}
}
}
void FillExtrusionBucket::upload(gfx::Context& context) {
vertexBuffer = context.createVertexBuffer(std::move(vertices));
indexBuffer = context.createIndexBuffer(std::move(triangles));
for (auto& pair : paintPropertyBinders) {
pair.second.upload(context);
}
uploaded = true;
}
bool FillExtrusionBucket::hasData() const {
return !triangleSegments.empty();
}
bool FillExtrusionBucket::supportsLayer(const style::Layer::Impl& impl) const {
return style::FillExtrusionLayer::Impl::staticTypeInfo() == impl.getTypeInfo();
}
float FillExtrusionBucket::getQueryRadius(const RenderLayer& layer) const {
const auto& evaluated = getEvaluated<FillExtrusionLayerProperties>(layer.evaluatedProperties);
const std::array<float, 2>& translate = evaluated.get<FillExtrusionTranslate>();
return util::length(translate[0], translate[1]);
}
} // namespace mbgl
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