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#include <mbgl/shader/line_uniforms.hpp>
#include <mbgl/style/layers/line_layer_properties.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/map/transform_state.hpp>
#include <mbgl/util/mat2.hpp>
#include <mbgl/sprite/sprite_atlas.hpp>
#include <mbgl/geometry/line_atlas.hpp>
namespace mbgl {
template <class Values, class...Args>
Values makeValues(const style::LinePaintProperties& properties,
float pixelRatio,
const RenderTile& tile,
const TransformState& state,
Args&&... args) {
// the distance over which the line edge fades out.
// Retina devices need a smaller distance to avoid aliasing.
float antialiasing = 1.0 / pixelRatio;
mat2 antialiasingMatrix;
matrix::identity(antialiasingMatrix);
matrix::scale(antialiasingMatrix, antialiasingMatrix, 1.0, std::cos(state.getPitch()));
matrix::rotate(antialiasingMatrix, antialiasingMatrix, state.getAngle());
// calculate how much longer the real world distance is at the top of the screen
// than at the middle of the screen.
float topedgelength = std::sqrt(std::pow(state.getSize().height, 2.0f) / 4.0f * (1.0f + std::pow(state.getAltitude(), 2.0f)));
float x = state.getSize().height / 2.0f * std::tan(state.getPitch());
return Values {
tile.translatedMatrix(properties.lineTranslate.value,
properties.lineTranslateAnchor.value,
state),
properties.lineOpacity.value,
properties.lineWidth.value / 2,
properties.lineGapWidth.value / 2,
properties.lineBlur.value + antialiasing,
-properties.lineOffset.value,
antialiasing / 2,
antialiasingMatrix,
1.0f / tile.id.pixelsToTileUnits(1.0, state.getZoom()),
(topedgelength + x) / topedgelength - 1.0f,
std::forward<Args>(args)...
};
}
LineColorUniforms::Values
LineColorUniforms::values(const style::LinePaintProperties& properties,
float pixelRatio,
const RenderTile& tile,
const TransformState& state) {
return makeValues<LineColorUniforms::Values>(
properties,
pixelRatio,
tile,
state,
properties.lineColor.value
);
}
LineSDFUniforms::Values
LineSDFUniforms::values(const style::LinePaintProperties& properties,
float pixelRatio,
const RenderTile& tile,
const TransformState& state,
const LinePatternPos& posA,
const LinePatternPos& posB,
float dashLineWidth,
float atlasWidth) {
const float widthA = posA.width * properties.lineDasharray.value.fromScale * dashLineWidth;
const float widthB = posB.width * properties.lineDasharray.value.toScale * dashLineWidth;
std::array<float, 2> scaleA {{
1.0f / tile.id.pixelsToTileUnits(widthA, state.getIntegerZoom()),
-posA.height / 2.0f
}};
std::array<float, 2> scaleB {{
1.0f / tile.id.pixelsToTileUnits(widthB, state.getIntegerZoom()),
-posB.height / 2.0f
}};
return makeValues<LineSDFUniforms::Values>(
properties,
pixelRatio,
tile,
state,
properties.lineColor.value,
scaleA,
scaleB,
posA.y,
posB.y,
properties.lineDasharray.value.t,
atlasWidth / (std::min(widthA, widthB) * 256.0f * pixelRatio) / 2.0f,
0
);
}
LinePatternUniforms::Values
LinePatternUniforms::values(const style::LinePaintProperties& properties,
float pixelRatio,
const RenderTile& tile,
const TransformState& state,
const SpriteAtlasPosition& posA,
const SpriteAtlasPosition& posB) {
std::array<float, 2> sizeA {{
tile.id.pixelsToTileUnits(posA.size[0] * properties.linePattern.value.fromScale, state.getIntegerZoom()),
posA.size[1]
}};
std::array<float, 2> sizeB {{
tile.id.pixelsToTileUnits(posB.size[0] * properties.linePattern.value.toScale, state.getIntegerZoom()),
posB.size[1]
}};
return makeValues<LinePatternUniforms::Values>(
properties,
pixelRatio,
tile,
state,
posA.tl,
posA.br,
posB.tl,
posB.br,
sizeA,
sizeB,
properties.linePattern.value.t,
0
);
}
} // namespace mbgl
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