diff options
Diffstat (limited to 'src/mbgl/renderer/layers/render_line_layer.cpp')
| -rw-r--r-- | src/mbgl/renderer/layers/render_line_layer.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/mbgl/renderer/layers/render_line_layer.cpp b/src/mbgl/renderer/layers/render_line_layer.cpp new file mode 100644 index 0000000000..1b4a1c0ff7 --- /dev/null +++ b/src/mbgl/renderer/layers/render_line_layer.cpp @@ -0,0 +1,204 @@ +#include <mbgl/renderer/layers/render_line_layer.hpp> +#include <mbgl/renderer/buckets/line_bucket.hpp> +#include <mbgl/renderer/render_tile.hpp> +#include <mbgl/renderer/paint_parameters.hpp> +#include <mbgl/renderer/image_manager.hpp> +#include <mbgl/programs/programs.hpp> +#include <mbgl/programs/line_program.hpp> +#include <mbgl/geometry/line_atlas.hpp> +#include <mbgl/tile/tile.hpp> +#include <mbgl/style/layers/line_layer_impl.hpp> +#include <mbgl/geometry/feature_index.hpp> +#include <mbgl/util/math.hpp> +#include <mbgl/util/intersection_tests.hpp> + +namespace mbgl { + +using namespace style; + +RenderLineLayer::RenderLineLayer(Immutable<style::LineLayer::Impl> _impl) + : RenderLayer(style::LayerType::Line, _impl), + unevaluated(impl().paint.untransitioned()) { +} + +const style::LineLayer::Impl& RenderLineLayer::impl() const { + return static_cast<const style::LineLayer::Impl&>(*baseImpl); +} + +std::unique_ptr<Bucket> RenderLineLayer::createBucket(const BucketParameters& parameters, const std::vector<const RenderLayer*>& layers) const { + return std::make_unique<LineBucket>(parameters, layers, impl().layout); +} + +void RenderLineLayer::transition(const TransitionParameters& parameters) { + unevaluated = impl().paint.transitioned(parameters, std::move(unevaluated)); +} + +void RenderLineLayer::evaluate(const PropertyEvaluationParameters& parameters) { + style::Properties<LineFloorwidth>::Unevaluated extra(unevaluated.get<style::LineWidth>()); + + auto dashArrayParams = parameters; + dashArrayParams.useIntegerZoom = true; + + evaluated = RenderLinePaintProperties::PossiblyEvaluated( + unevaluated.evaluate(parameters).concat(extra.evaluate(dashArrayParams))); + + passes = (evaluated.get<style::LineOpacity>().constantOr(1.0) > 0 + && evaluated.get<style::LineColor>().constantOr(Color::black()).a > 0 + && evaluated.get<style::LineWidth>().constantOr(1.0) > 0) + ? RenderPass::Translucent : RenderPass::None; +} + +bool RenderLineLayer::hasTransition() const { + return unevaluated.hasTransition(); +} + +void RenderLineLayer::render(PaintParameters& parameters, RenderSource*) { + if (parameters.pass == RenderPass::Opaque) { + return; + } + + for (const RenderTile& tile : renderTiles) { + assert(dynamic_cast<LineBucket*>(tile.tile.getBucket(*baseImpl))); + LineBucket& bucket = *reinterpret_cast<LineBucket*>(tile.tile.getBucket(*baseImpl)); + + auto draw = [&] (auto& program, auto&& uniformValues) { + program.get(evaluated).draw( + parameters.context, + gl::Triangles(), + parameters.depthModeForSublayer(0, gl::DepthMode::ReadOnly), + parameters.stencilModeForClipping(tile.clip), + parameters.colorModeForRenderPass(), + std::move(uniformValues), + *bucket.vertexBuffer, + *bucket.indexBuffer, + bucket.segments, + bucket.paintPropertyBinders.at(getID()), + evaluated, + parameters.state.getZoom(), + getID() + ); + }; + + if (!evaluated.get<LineDasharray>().from.empty()) { + const LinePatternCap cap = bucket.layout.get<LineCap>() == LineCapType::Round + ? LinePatternCap::Round : LinePatternCap::Square; + LinePatternPos posA = parameters.lineAtlas.getDashPosition(evaluated.get<LineDasharray>().from, cap); + LinePatternPos posB = parameters.lineAtlas.getDashPosition(evaluated.get<LineDasharray>().to, cap); + + parameters.lineAtlas.bind(parameters.context, 0); + + draw(parameters.programs.lineSDF, + LineSDFProgram::uniformValues( + evaluated, + parameters.pixelRatio, + tile, + parameters.state, + parameters.pixelsToGLUnits, + posA, + posB, + parameters.lineAtlas.getSize().width)); + + } else if (!evaluated.get<LinePattern>().from.empty()) { + optional<ImagePosition> posA = parameters.imageManager.getPattern(evaluated.get<LinePattern>().from); + optional<ImagePosition> posB = parameters.imageManager.getPattern(evaluated.get<LinePattern>().to); + + if (!posA || !posB) + return; + + parameters.imageManager.bind(parameters.context, 0); + + draw(parameters.programs.linePattern, + LinePatternProgram::uniformValues( + evaluated, + tile, + parameters.state, + parameters.pixelsToGLUnits, + parameters.imageManager.getPixelSize(), + *posA, + *posB)); + + } else { + draw(parameters.programs.line, + LineProgram::uniformValues( + evaluated, + tile, + parameters.state, + parameters.pixelsToGLUnits)); + } + } +} + +optional<GeometryCollection> offsetLine(const GeometryCollection& rings, const double offset) { + if (offset == 0) return {}; + + GeometryCollection newRings; + Point<double> zero(0, 0); + for (const auto& ring : rings) { + newRings.emplace_back(); + auto& newRing = newRings.back(); + + for (auto i = ring.begin(); i != ring.end(); i++) { + auto& p = *i; + + Point<double> aToB = i == ring.begin() ? + zero : + util::perp(util::unit(convertPoint<double>(p - *(i - 1)))); + Point<double> bToC = i + 1 == ring.end() ? + zero : + util::perp(util::unit(convertPoint<double>(*(i + 1) - p))); + Point<double> extrude = util::unit(aToB + bToC); + + const double cosHalfAngle = extrude.x * bToC.x + extrude.y * bToC.y; + extrude *= (1.0 / cosHalfAngle); + + newRing.push_back(convertPoint<int16_t>(extrude * offset) + p); + } + } + + return newRings; +} + +bool RenderLineLayer::queryIntersectsFeature( + const GeometryCoordinates& queryGeometry, + const GeometryTileFeature& feature, + const float zoom, + const float bearing, + const float pixelsToTileUnits) const { + + // Translate query geometry + auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry( + queryGeometry, + evaluated.get<style::LineTranslate>(), + evaluated.get<style::LineTranslateAnchor>(), + bearing, + pixelsToTileUnits); + + // Evaluate function + auto offset = evaluated.get<style::LineOffset>() + .evaluate(feature, zoom, style::LineOffset::defaultValue()) * pixelsToTileUnits; + + // Apply offset to geometry + auto offsetGeometry = offsetLine(feature.getGeometries(), offset); + + // Test intersection + const float halfWidth = getLineWidth(feature, zoom) / 2.0 * pixelsToTileUnits; + return util::polygonIntersectsBufferedMultiLine( + translatedQueryGeometry.value_or(queryGeometry), + offsetGeometry.value_or(feature.getGeometries()), + halfWidth); +} + +float RenderLineLayer::getLineWidth(const GeometryTileFeature& feature, const float zoom) const { + float lineWidth = evaluated.get<style::LineWidth>() + .evaluate(feature, zoom, style::LineWidth::defaultValue()); + float gapWidth = evaluated.get<style::LineGapWidth>() + .evaluate(feature, zoom, style::LineGapWidth::defaultValue()); + if (gapWidth) { + return gapWidth + 2 * lineWidth; + } else { + return lineWidth; + } +} + + +} // namespace mbgl |