277 lines
10 KiB
C++
277 lines
10 KiB
C++
#include <mbgl/renderer/layers/render_line_layer.hpp>
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#include <mbgl/renderer/buckets/line_bucket.hpp>
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#include <mbgl/renderer/render_tile.hpp>
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#include <mbgl/renderer/paint_parameters.hpp>
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#include <mbgl/renderer/image_manager.hpp>
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#include <mbgl/programs/programs.hpp>
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#include <mbgl/programs/line_program.hpp>
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#include <mbgl/geometry/line_atlas.hpp>
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#include <mbgl/tile/tile.hpp>
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#include <mbgl/style/layers/line_layer_impl.hpp>
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#include <mbgl/gfx/cull_face_mode.hpp>
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#include <mbgl/geometry/feature_index.hpp>
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#include <mbgl/util/math.hpp>
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#include <mbgl/util/intersection_tests.hpp>
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#include <mbgl/tile/geometry_tile.hpp>
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namespace mbgl {
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using namespace style;
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RenderLineLayer::RenderLineLayer(Immutable<style::LineLayer::Impl> _impl)
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: RenderLayer(std::move(_impl)),
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unevaluated(impl().paint.untransitioned()),
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colorRamp({256, 1}) {
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}
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const style::LineLayer::Impl& RenderLineLayer::impl() const {
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return static_cast<const style::LineLayer::Impl&>(*baseImpl);
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}
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void RenderLineLayer::transition(const TransitionParameters& parameters) {
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unevaluated = impl().paint.transitioned(parameters, std::move(unevaluated));
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}
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void RenderLineLayer::evaluate(const PropertyEvaluationParameters& parameters) {
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evaluated = unevaluated.evaluate(parameters);
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crossfade = parameters.getCrossfadeParameters();
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passes = (evaluated.get<style::LineOpacity>().constantOr(1.0) > 0
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&& evaluated.get<style::LineColor>().constantOr(Color::black()).a > 0
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&& evaluated.get<style::LineWidth>().constantOr(1.0) > 0)
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? RenderPass::Translucent : RenderPass::None;
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}
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bool RenderLineLayer::hasTransition() const {
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return unevaluated.hasTransition();
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}
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bool RenderLineLayer::hasCrossfade() const {
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return crossfade.t != 1;
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}
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void RenderLineLayer::render(PaintParameters& parameters, RenderSource*) {
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if (parameters.pass == RenderPass::Opaque) {
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return;
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}
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for (const RenderTile& tile : renderTiles) {
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auto bucket_ = tile.tile.getBucket<LineBucket>(*baseImpl);
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if (!bucket_) {
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continue;
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}
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LineBucket& bucket = *bucket_;
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auto draw = [&](auto& programInstance,
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auto&& uniformValues,
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const optional<ImagePosition>& patternPositionA,
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const optional<ImagePosition>& patternPositionB, auto&& textureBindings) {
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const auto& paintPropertyBinders = bucket.paintPropertyBinders.at(getID());
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paintPropertyBinders.setPatternParameters(patternPositionA, patternPositionB, crossfade);
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const auto allUniformValues = programInstance.computeAllUniformValues(
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std::move(uniformValues),
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paintPropertyBinders,
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evaluated,
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parameters.state.getZoom()
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);
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const auto allAttributeBindings = programInstance.computeAllAttributeBindings(
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*bucket.vertexBuffer,
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paintPropertyBinders,
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evaluated
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);
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checkRenderability(parameters, programInstance.activeBindingCount(allAttributeBindings));
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programInstance.draw(
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parameters.context,
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gfx::Triangles(),
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parameters.depthModeForSublayer(0, gfx::DepthMaskType::ReadOnly),
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parameters.stencilModeForClipping(tile.clip),
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parameters.colorModeForRenderPass(),
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gfx::CullFaceMode::disabled(),
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*bucket.indexBuffer,
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bucket.segments,
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allUniformValues,
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allAttributeBindings,
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std::move(textureBindings),
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getID()
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);
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};
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if (!evaluated.get<LineDasharray>().from.empty()) {
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const LinePatternCap cap = bucket.layout.get<LineCap>() == LineCapType::Round
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? LinePatternCap::Round : LinePatternCap::Square;
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LinePatternPos posA = parameters.lineAtlas.getDashPosition(evaluated.get<LineDasharray>().from, cap);
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LinePatternPos posB = parameters.lineAtlas.getDashPosition(evaluated.get<LineDasharray>().to, cap);
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draw(parameters.programs.getLineLayerPrograms().lineSDF,
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LineSDFProgram::layoutUniformValues(
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evaluated,
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parameters.pixelRatio,
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tile,
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parameters.state,
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parameters.pixelsToGLUnits,
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posA,
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posB,
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crossfade,
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parameters.lineAtlas.getSize().width),
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{},
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{},
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LineSDFProgram::TextureBindings{
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parameters.lineAtlas.textureBinding(parameters.context),
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});
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} else if (!unevaluated.get<LinePattern>().isUndefined()) {
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const auto linePatternValue = evaluated.get<LinePattern>().constantOr(Faded<std::basic_string<char>>{ "", ""});
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GeometryTile& geometryTile = static_cast<GeometryTile&>(tile.tile);
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const Size texsize = geometryTile.iconAtlasTexture->size;
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optional<ImagePosition> posA = geometryTile.getPattern(linePatternValue.from);
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optional<ImagePosition> posB = geometryTile.getPattern(linePatternValue.to);
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draw(parameters.programs.getLineLayerPrograms().linePattern,
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LinePatternProgram::layoutUniformValues(
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evaluated,
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tile,
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parameters.state,
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parameters.pixelsToGLUnits,
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texsize,
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crossfade,
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parameters.pixelRatio),
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posA,
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posB,
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LinePatternProgram::TextureBindings{
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textures::image::Value{ geometryTile.iconAtlasTexture->getResource(), gfx::TextureFilterType::Linear },
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});
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} else if (!unevaluated.get<LineGradient>().getValue().isUndefined()) {
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if (!colorRampTexture) {
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colorRampTexture = parameters.context.createTexture(colorRamp);
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}
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draw(parameters.programs.getLineLayerPrograms().lineGradient,
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LineGradientProgram::layoutUniformValues(
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evaluated,
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tile,
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parameters.state,
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parameters.pixelsToGLUnits),
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{},
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{},
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LineGradientProgram::TextureBindings{
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textures::image::Value{ colorRampTexture->getResource(), gfx::TextureFilterType::Linear },
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});
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} else {
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draw(parameters.programs.getLineLayerPrograms().line,
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LineProgram::layoutUniformValues(
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evaluated,
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tile,
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parameters.state,
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parameters.pixelsToGLUnits),
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{},
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{},
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LineProgram::TextureBindings{});
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}
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}
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}
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optional<GeometryCollection> offsetLine(const GeometryCollection& rings, const double offset) {
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if (offset == 0) return {};
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GeometryCollection newRings;
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Point<double> zero(0, 0);
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for (const auto& ring : rings) {
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newRings.emplace_back();
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auto& newRing = newRings.back();
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for (auto i = ring.begin(); i != ring.end(); i++) {
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auto& p = *i;
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Point<double> aToB = i == ring.begin() ?
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zero :
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util::perp(util::unit(convertPoint<double>(p - *(i - 1))));
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Point<double> bToC = i + 1 == ring.end() ?
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zero :
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util::perp(util::unit(convertPoint<double>(*(i + 1) - p)));
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Point<double> extrude = util::unit(aToB + bToC);
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const double cosHalfAngle = extrude.x * bToC.x + extrude.y * bToC.y;
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extrude *= (1.0 / cosHalfAngle);
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newRing.push_back(convertPoint<int16_t>(extrude * offset) + p);
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}
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}
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return newRings;
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}
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bool RenderLineLayer::queryIntersectsFeature(
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const GeometryCoordinates& queryGeometry,
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const GeometryTileFeature& feature,
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const float zoom,
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const TransformState& transformState,
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const float pixelsToTileUnits,
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const mat4&) const {
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// Translate query geometry
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auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
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queryGeometry,
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evaluated.get<style::LineTranslate>(),
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evaluated.get<style::LineTranslateAnchor>(),
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transformState.getBearing(),
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pixelsToTileUnits);
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// Evaluate function
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auto offset = evaluated.get<style::LineOffset>()
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.evaluate(feature, zoom, style::LineOffset::defaultValue()) * pixelsToTileUnits;
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// Apply offset to geometry
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auto offsetGeometry = offsetLine(feature.getGeometries(), offset);
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// Test intersection
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const float halfWidth = getLineWidth(feature, zoom) / 2.0 * pixelsToTileUnits;
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return util::polygonIntersectsBufferedMultiLine(
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translatedQueryGeometry.value_or(queryGeometry),
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offsetGeometry.value_or(feature.getGeometries()),
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halfWidth);
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}
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void RenderLineLayer::updateColorRamp() {
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auto colorValue = unevaluated.get<LineGradient>().getValue();
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if (colorValue.isUndefined()) {
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return;
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}
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const auto length = colorRamp.bytes();
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for (uint32_t i = 0; i < length; i += 4) {
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const auto color = colorValue.evaluate(static_cast<double>(i) / length);
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colorRamp.data[i] = std::floor(color.r * 255);
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colorRamp.data[i + 1] = std::floor(color.g * 255);
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colorRamp.data[i + 2] = std::floor(color.b * 255);
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colorRamp.data[i + 3] = std::floor(color.a * 255);
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}
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if (colorRampTexture) {
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colorRampTexture = nullopt;
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}
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}
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float RenderLineLayer::getLineWidth(const GeometryTileFeature& feature, const float zoom) const {
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float lineWidth = evaluated.get<style::LineWidth>()
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.evaluate(feature, zoom, style::LineWidth::defaultValue());
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float gapWidth = evaluated.get<style::LineGapWidth>()
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.evaluate(feature, zoom, style::LineGapWidth::defaultValue());
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if (gapWidth) {
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return gapWidth + 2 * lineWidth;
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} else {
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return lineWidth;
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}
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}
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void RenderLineLayer::update() {
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updateColorRamp();
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}
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} // namespace mbgl
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