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#include <mbgl/programs/line_program.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 {
static_assert(sizeof(LineAttributes::Vertex) == 8, "expected LineVertex size");
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 {
uniforms::u_matrix::Value{ tile.translatedMatrix(properties.lineTranslate.value,
properties.lineTranslateAnchor.value,
state) },
uniforms::u_opacity::Value{ properties.lineOpacity.value },
uniforms::u_linewidth::Value{ properties.lineWidth.value / 2 },
uniforms::u_gapwidth::Value{ properties.lineGapWidth.value / 2 },
uniforms::u_blur::Value{ properties.lineBlur.value + antialiasing },
uniforms::u_offset::Value{ -properties.lineOffset.value },
uniforms::u_antialiasing::Value{ antialiasing / 2 },
uniforms::u_antialiasingmatrix::Value{ antialiasingMatrix },
uniforms::u_ratio::Value{ 1.0f / tile.id.pixelsToTileUnits(1.0, state.getZoom()) },
uniforms::u_extra::Value{ (topedgelength + x) / topedgelength - 1.0f },
std::forward<Args>(args)...
};
}
LineProgram::UniformValues
LineProgram::uniformValues(const style::LinePaintProperties& properties,
float pixelRatio,
const RenderTile& tile,
const TransformState& state) {
return makeValues<LineProgram::UniformValues>(
properties,
pixelRatio,
tile,
state,
uniforms::u_color::Value{ properties.lineColor.value }
);
}
LineSDFProgram::UniformValues
LineSDFProgram::uniformValues(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<LineSDFProgram::UniformValues>(
properties,
pixelRatio,
tile,
state,
uniforms::u_color::Value{ properties.lineColor.value },
uniforms::u_patternscale_a::Value{ scaleA },
uniforms::u_patternscale_b::Value{ scaleB },
uniforms::u_tex_y_a::Value{ posA.y },
uniforms::u_tex_y_b::Value{ posB.y },
uniforms::u_mix::Value{ properties.lineDasharray.value.t },
uniforms::u_sdfgamma::Value{ atlasWidth / (std::min(widthA, widthB) * 256.0f * pixelRatio) / 2.0f },
uniforms::u_image::Value{ 0 }
);
}
LinePatternProgram::UniformValues
LinePatternProgram::uniformValues(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<LinePatternProgram::UniformValues>(
properties,
pixelRatio,
tile,
state,
uniforms::u_pattern_tl_a::Value{ posA.tl },
uniforms::u_pattern_br_a::Value{ posA.br },
uniforms::u_pattern_tl_b::Value{ posB.tl },
uniforms::u_pattern_br_b::Value{ posB.br },
uniforms::u_pattern_size_a::Value{ sizeA },
uniforms::u_pattern_size_b::Value{ sizeB },
uniforms::u_fade::Value{ properties.linePattern.value.t },
uniforms::u_image::Value{ 0 }
);
}
} // namespace mbgl
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