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#include <mbgl/renderer/painter.hpp>
#include <mbgl/renderer/paint_parameters.hpp>
#include <mbgl/renderer/line_bucket.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/style/layers/line_layer.hpp>
#include <mbgl/style/layers/line_layer_impl.hpp>
#include <mbgl/shader/shaders.hpp>
#include <mbgl/sprite/sprite_atlas.hpp>
#include <mbgl/geometry/line_atlas.hpp>
#include <mbgl/util/mat2.hpp>
namespace mbgl {
using namespace style;
void Painter::renderLine(PaintParameters& parameters,
LineBucket& bucket,
const LineLayer& layer,
const RenderTile& tile) {
// Abort early.
if (pass == RenderPass::Opaque) return;
context.stencilOp = { gl::StencilTestOperation::Keep, gl::StencilTestOperation::Keep,
gl::StencilTestOperation::Replace };
context.stencilTest = true;
context.depthFunc = gl::DepthTestFunction::LessEqual;
context.depthTest = true;
context.depthMask = false;
const auto& properties = layer.impl->paint;
const auto& layout = bucket.layout;
// the distance over which the line edge fades out.
// Retina devices need a smaller distance to avoid aliasing.
float antialiasing = 1.0 / frame.pixelRatio;
float blur = properties.lineBlur + antialiasing;
const Color color = properties.lineColor;
const float opacity = properties.lineOpacity;
const float ratio = 1.0 / tile.id.pixelsToTileUnits(1.0, state.getZoom());
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.getHeight(), 2.0f) / 4.0f * (1.0f + std::pow(state.getAltitude(), 2.0f)));
float x = state.getHeight() / 2.0f * std::tan(state.getPitch());
float extra = (topedgelength + x) / topedgelength - 1.0f;
mat4 vtxMatrix = tile.translatedMatrix(properties.lineTranslate,
properties.lineTranslateAnchor,
state);
setDepthSublayer(0);
auto& linesdfShader = parameters.shaders.lineSDF;
auto& linepatternShader = parameters.shaders.linePattern;
auto& lineShader = parameters.shaders.line;
if (!properties.lineDasharray.value.from.empty()) {
context.program = linesdfShader.getID();
linesdfShader.u_matrix = vtxMatrix;
linesdfShader.u_linewidth = properties.lineWidth / 2;
linesdfShader.u_gapwidth = properties.lineGapWidth / 2;
linesdfShader.u_antialiasing = antialiasing / 2;
linesdfShader.u_ratio = ratio;
linesdfShader.u_blur = blur;
linesdfShader.u_color = color;
linesdfShader.u_opacity = opacity;
const LinePatternCap cap =
layout.lineCap == LineCapType::Round ? LinePatternCap::Round : LinePatternCap::Square;
LinePatternPos posA = lineAtlas->getDashPosition(properties.lineDasharray.value.from, cap);
LinePatternPos posB = lineAtlas->getDashPosition(properties.lineDasharray.value.to, cap);
const float widthA = posA.width * properties.lineDasharray.value.fromScale * layer.impl->dashLineWidth;
const float widthB = posB.width * properties.lineDasharray.value.toScale * layer.impl->dashLineWidth;
float scaleXA = 1.0 / tile.id.pixelsToTileUnits(widthA, state.getIntegerZoom());
float scaleYA = -posA.height / 2.0;
float scaleXB = 1.0 / tile.id.pixelsToTileUnits(widthB, state.getIntegerZoom());
float scaleYB = -posB.height / 2.0;
linesdfShader.u_patternscale_a = {{ scaleXA, scaleYA }};
linesdfShader.u_tex_y_a = posA.y;
linesdfShader.u_patternscale_b = {{ scaleXB, scaleYB }};
linesdfShader.u_tex_y_b = posB.y;
linesdfShader.u_sdfgamma = lineAtlas->width / (std::min(widthA, widthB) * 256.0 * frame.pixelRatio) / 2;
linesdfShader.u_mix = properties.lineDasharray.value.t;
linesdfShader.u_extra = extra;
linesdfShader.u_offset = -properties.lineOffset;
linesdfShader.u_antialiasingmatrix = antialiasingMatrix;
linesdfShader.u_image = 0;
lineAtlas->bind(context, 0);
bucket.drawLineSDF(linesdfShader, context, paintMode());
} else if (!properties.linePattern.value.from.empty()) {
optional<SpriteAtlasPosition> imagePosA = spriteAtlas->getPosition(
properties.linePattern.value.from, SpritePatternMode::Repeating);
optional<SpriteAtlasPosition> imagePosB =
spriteAtlas->getPosition(properties.linePattern.value.to, SpritePatternMode::Repeating);
if (!imagePosA || !imagePosB)
return;
context.program = linepatternShader.getID();
linepatternShader.u_matrix = vtxMatrix;
linepatternShader.u_linewidth = properties.lineWidth / 2;
linepatternShader.u_gapwidth = properties.lineGapWidth / 2;
linepatternShader.u_antialiasing = antialiasing / 2;
linepatternShader.u_ratio = ratio;
linepatternShader.u_blur = blur;
linepatternShader.u_pattern_size_a = {{
tile.id.pixelsToTileUnits((*imagePosA).size[0] * properties.linePattern.value.fromScale, state.getIntegerZoom()),
(*imagePosA).size[1]
}};
linepatternShader.u_pattern_tl_a = (*imagePosA).tl;
linepatternShader.u_pattern_br_a = (*imagePosA).br;
linepatternShader.u_pattern_size_b = {{
tile.id.pixelsToTileUnits((*imagePosB).size[0] * properties.linePattern.value.toScale, state.getIntegerZoom()),
(*imagePosB).size[1]
}};
linepatternShader.u_pattern_tl_b = (*imagePosB).tl;
linepatternShader.u_pattern_br_b = (*imagePosB).br;
linepatternShader.u_fade = properties.linePattern.value.t;
linepatternShader.u_opacity = properties.lineOpacity;
linepatternShader.u_extra = extra;
linepatternShader.u_offset = -properties.lineOffset;
linepatternShader.u_antialiasingmatrix = antialiasingMatrix;
linepatternShader.u_image = 0;
spriteAtlas->bind(true, context, 0);
bucket.drawLinePatterns(linepatternShader, context, paintMode());
} else {
context.program = lineShader.getID();
lineShader.u_matrix = vtxMatrix;
lineShader.u_linewidth = properties.lineWidth / 2;
lineShader.u_gapwidth = properties.lineGapWidth / 2;
lineShader.u_antialiasing = antialiasing / 2;
lineShader.u_ratio = ratio;
lineShader.u_blur = blur;
lineShader.u_extra = extra;
lineShader.u_offset = -properties.lineOffset;
lineShader.u_antialiasingmatrix = antialiasingMatrix;
lineShader.u_color = color;
lineShader.u_opacity = opacity;
bucket.drawLines(lineShader, context, paintMode());
}
}
} // namespace mbgl
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