137 lines
4.8 KiB
C++
137 lines
4.8 KiB
C++
#include <mbgl/renderer/painter.hpp>
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#include <mbgl/renderer/line_bucket.hpp>
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#include <mbgl/style/style.hpp>
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#include <mbgl/style/style_layer.hpp>
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#include <mbgl/map/sprite.hpp>
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#include <mbgl/geometry/sprite_atlas.hpp>
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#include <mbgl/geometry/line_atlas.hpp>
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#include <mbgl/map/map.hpp>
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using namespace mbgl;
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void Painter::renderLine(LineBucket& bucket, util::ptr<StyleLayer> layer_desc, const Tile::ID& id, const mat4 &matrix) {
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// Abort early.
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if (pass == RenderPass::Opaque) return;
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if (!bucket.hasData()) return;
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const LineProperties &properties = layer_desc->getProperties<LineProperties>();
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// the distance over which the line edge fades out.
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// Retina devices need a smaller distance to avoid aliasing.
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float antialiasing = 1 / state.getPixelRatio();
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float blur = properties.blur + antialiasing;
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float edgeWidth = properties.width / 2.0;
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float inset = -1;
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float offset = 0;
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float shift = 0;
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if (properties.gap_width != 0) {
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inset = properties.gap_width / 2.0 + antialiasing * 0.5;
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edgeWidth = properties.width;
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// shift outer lines half a pixel towards the middle to eliminate the crack
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offset = inset - antialiasing / 2.0;
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}
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float outset = offset + edgeWidth + antialiasing / 2.0 + shift;
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Color color = properties.color;
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color[0] *= properties.opacity;
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color[1] *= properties.opacity;
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color[2] *= properties.opacity;
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color[3] *= properties.opacity;
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float ratio = state.getPixelRatio();
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mat4 vtxMatrix = translatedMatrix(matrix, properties.translate, id, properties.translateAnchor);
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depthRange(strata, 1.0f);
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// We're only drawing end caps + round line joins if the line is > 2px. Otherwise, they aren't visible anyway.
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if (bucket.hasPoints() && outset > 1.0f) {
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useProgram(linejoinShader->program);
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linejoinShader->u_matrix = vtxMatrix;
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linejoinShader->u_color = color;
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linejoinShader->u_world = {{
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state.getFramebufferWidth() * 0.5f,
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state.getFramebufferHeight() * 0.5f
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}};
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linejoinShader->u_linewidth = {{
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((outset - 0.25f) * state.getPixelRatio()),
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((inset - 0.25f) * state.getPixelRatio())
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}};
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float pointSize = std::ceil(state.getPixelRatio() * outset * 2.0);
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#if defined(GL_ES_VERSION_2_0)
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linejoinShader->u_size = pointSize;
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#else
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MBGL_CHECK_ERROR(glPointSize(pointSize));
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#endif
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bucket.drawPoints(*linejoinShader);
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}
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if (properties.dash_array.size()) {
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useProgram(linesdfShader->program);
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linesdfShader->u_matrix = vtxMatrix;
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linesdfShader->u_exmatrix = extrudeMatrix;
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linesdfShader->u_linewidth = {{ outset, inset }};
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linesdfShader->u_ratio = ratio;
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linesdfShader->u_blur = blur;
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linesdfShader->u_color = color;
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LinePatternPos pos = lineAtlas.getDashPosition(properties.dash_array, bucket.properties.cap == CapType::Round);
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lineAtlas.bind();
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float patternratio = std::pow(2.0, std::floor(std::log2(state.getScale())) - id.z) / 8.0;
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float scaleX = patternratio / pos.width / properties.dash_line_width;
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float scaleY = -pos.height / 2.0;
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linesdfShader->u_patternscale = {{ scaleX, scaleY }};
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linesdfShader->u_tex_y = pos.y;
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linesdfShader->u_image = 0;
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linesdfShader->u_sdfgamma = lineAtlas.width / (properties.dash_line_width * pos.width * 256.0 * state.getPixelRatio());
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bucket.drawLineSDF(*linesdfShader);
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} else if (properties.image.size()) {
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SpriteAtlasPosition imagePos = spriteAtlas.getPosition(properties.image, true);
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float factor = 8.0 / std::pow(2, state.getIntegerZoom() - id.z);
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float fade = std::fmod(state.getZoom(), 1.0);
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useProgram(linepatternShader->program);
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linepatternShader->u_matrix = vtxMatrix;
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linepatternShader->u_exmatrix = extrudeMatrix;
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linepatternShader->u_linewidth = {{ outset, inset }};
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linepatternShader->u_ratio = ratio;
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linepatternShader->u_blur = blur;
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linepatternShader->u_pattern_size = {{imagePos.size[0] * factor, imagePos.size[1]}};
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linepatternShader->u_pattern_tl = imagePos.tl;
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linepatternShader->u_pattern_br = imagePos.br;
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linepatternShader->u_fade = fade;
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MBGL_CHECK_ERROR(glActiveTexture(GL_TEXTURE0));
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spriteAtlas.bind(true);
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MBGL_CHECK_ERROR(glDepthRange(strata + strata_epsilon, 1.0f)); // may or may not matter
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bucket.drawLinePatterns(*linepatternShader);
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} else {
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useProgram(lineShader->program);
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lineShader->u_matrix = vtxMatrix;
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lineShader->u_exmatrix = extrudeMatrix;
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lineShader->u_linewidth = {{ outset, inset }};
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lineShader->u_ratio = ratio;
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lineShader->u_blur = blur;
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lineShader->u_color = color;
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bucket.drawLines(*lineShader);
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}
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}
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