1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
#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) {
auto& programInstance = program.get(evaluated);
const auto& paintPropertyBinders = bucket.paintPropertyBinders.at(getID());
const auto allUniformValues = programInstance.computeAllUniformValues(
std::move(uniformValues),
paintPropertyBinders,
evaluated,
parameters.state.getZoom()
);
const auto allAttributeBindings = programInstance.computeAllAttributeBindings(
*bucket.vertexBuffer,
paintPropertyBinders,
evaluated
);
checkRenderability(parameters, programInstance.activeBindingCount(allAttributeBindings));
programInstance.draw(
parameters.context,
gl::Triangles(),
parameters.depthModeForSublayer(0, gl::DepthMode::ReadOnly),
parameters.stencilModeForClipping(tile.clip),
parameters.colorModeForRenderPass(),
*bucket.indexBuffer,
bucket.segments,
allUniformValues,
allAttributeBindings,
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 TransformState& transformState,
const float pixelsToTileUnits,
const mat4&) const {
// Translate query geometry
auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
queryGeometry,
evaluated.get<style::LineTranslate>(),
evaluated.get<style::LineTranslateAnchor>(),
transformState.getAngle(),
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
|
