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#include <mbgl/renderer/buckets/heatmap_bucket.hpp>
#include <mbgl/renderer/bucket_parameters.hpp>
#include <mbgl/programs/heatmap_program.hpp>
#include <mbgl/style/layers/heatmap_layer_impl.hpp>
#include <mbgl/renderer/layers/render_heatmap_layer.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/math.hpp>
namespace mbgl {
using namespace style;
HeatmapBucket::HeatmapBucket(const BucketParameters& parameters, const std::vector<Immutable<style::LayerProperties>>& layers)
: mode(parameters.mode) {
for (const auto& layer : layers) {
paintPropertyBinders.emplace(
std::piecewise_construct,
std::forward_as_tuple(layer->baseImpl->id),
std::forward_as_tuple(
getEvaluated<HeatmapLayerProperties>(layer),
parameters.tileID.overscaledZ));
}
}
HeatmapBucket::~HeatmapBucket() = default;
void HeatmapBucket::upload(gfx::UploadPass& uploadPass) {
vertexBuffer = uploadPass.createVertexBuffer(std::move(vertices));
indexBuffer = uploadPass.createIndexBuffer(std::move(triangles));
for (auto& pair : paintPropertyBinders) {
pair.second.upload(uploadPass);
}
uploaded = true;
}
bool HeatmapBucket::hasData() const {
return !segments.empty();
}
bool HeatmapBucket::supportsLayer(const style::Layer::Impl& impl) const {
return style::HeatmapLayer::Impl::staticTypeInfo() == impl.getTypeInfo();
}
void HeatmapBucket::addFeature(const GeometryTileFeature& feature,
const GeometryCollection& geometry,
const ImagePositions&,
const PatternLayerMap&) {
constexpr const uint16_t vertexLength = 4;
for (auto& points : geometry) {
for(auto& point : points) {
auto x = point.x;
auto y = point.y;
// Do not include points that are outside the tile boundaries.
if (x < 0 || x >= util::EXTENT || y < 0 || y >= util::EXTENT) {
continue;
}
if (segments.empty() || segments.back().vertexLength + vertexLength > std::numeric_limits<uint16_t>::max()) {
// Move to a new segments because the old one can't hold the geometry.
segments.emplace_back(vertices.elements(), triangles.elements());
}
// this geometry will be of the Point type, and we'll derive
// two triangles from it.
//
// ┌─────────┐
// │ 4 3 │
// │ │
// │ 1 2 │
// └─────────┘
//
vertices.emplace_back(HeatmapProgram::vertex(point, -1, -1)); // 1
vertices.emplace_back(HeatmapProgram::vertex(point, 1, -1)); // 2
vertices.emplace_back(HeatmapProgram::vertex(point, 1, 1)); // 3
vertices.emplace_back(HeatmapProgram::vertex(point, -1, 1)); // 4
auto& segment = segments.back();
assert(segment.vertexLength <= std::numeric_limits<uint16_t>::max());
uint16_t index = segment.vertexLength;
// 1, 2, 3
// 1, 4, 3
triangles.emplace_back(index, index + 1, index + 2);
triangles.emplace_back(index, index + 3, index + 2);
segment.vertexLength += vertexLength;
segment.indexLength += 6;
}
}
for (auto& pair : paintPropertyBinders) {
pair.second.populateVertexVectors(feature, vertices.elements(), {}, {});
}
}
float HeatmapBucket::getQueryRadius(const RenderLayer& layer) const {
(void)layer;
return 0;
}
} // namespace mbgl
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