TEST(Buckets, LineBucket) {
HeadlessBackend backend({ 512, 256 });
BackendScope scope { backend };
gl::Context context;
LineBucket bucket { { {0, 0, 0}, MapMode::Static, 1.0 }, {}, {} };
ASSERT_FALSE(bucket.hasData());
ASSERT_FALSE(bucket.needsUpload());
// Ignore invalid feature type.
GeometryCollection point { { { 0, 0 } } };
bucket.addFeature(StubGeometryTileFeature { {}, FeatureType::Point, point, properties }, point);
ASSERT_FALSE(bucket.hasData());
GeometryCollection line { { { 0, 0 }, { 1, 1 } } };
bucket.addFeature(StubGeometryTileFeature { {}, FeatureType::LineString, line, properties }, line);
ASSERT_TRUE(bucket.hasData());
ASSERT_TRUE(bucket.needsUpload());
bucket.upload(context);
ASSERT_FALSE(bucket.needsUpload());
}
void Painter::renderLine(LineBucket& bucket, util::ptr<StyleLayer> layer_desc, const Tile::ID& id, const mat4 &matrix) {
// Abort early.
if (pass == RenderPass::Opaque) return;
if (!bucket.hasData()) return;
const LineProperties &properties = layer_desc->getProperties<LineProperties>();
float antialiasing = 1 / state.getPixelRatio();
float width = properties.width;
float offset = properties.gap_width == 0 ? 0 : (properties.gap_width + width) / 2;
float blur = properties.blur + antialiasing;
float inset = std::fmin((std::fmax(-1, offset - width / 2 - antialiasing / 2) + 1), 16.0f);
float outset = std::fmin(offset + width / 2 + antialiasing / 2, 16.0f);
Color color = properties.color;
color[0] *= properties.opacity;
color[1] *= properties.opacity;
color[2] *= properties.opacity;
color[3] *= properties.opacity;
float dash_length = properties.dash_array[0];
float dash_gap = properties.dash_array[1];
float ratio = state.getPixelRatio();
mat4 vtxMatrix = translatedMatrix(matrix, properties.translate, id, properties.translateAnchor);
depthRange(strata, 1.0f);
// We're only drawing end caps + round line joins if the line is > 2px. Otherwise, they aren't visible anyway.
if (bucket.hasPoints() && outset > 1.0f) {
useProgram(linejoinShader->program);
linejoinShader->u_matrix = vtxMatrix;
linejoinShader->u_color = color;
linejoinShader->u_world = {{
state.getFramebufferWidth() * 0.5f,
state.getFramebufferHeight() * 0.5f
}};
linejoinShader->u_linewidth = {{
((outset - 0.25f) * state.getPixelRatio()),
((inset - 0.25f) * state.getPixelRatio())
}};
float pointSize = std::ceil(state.getPixelRatio() * outset * 2.0);
#if defined(GL_ES_VERSION_2_0)
linejoinShader->u_size = pointSize;
#else
MBGL_CHECK_ERROR(glPointSize(pointSize));
#endif
bucket.drawPoints(*linejoinShader);
}
if (properties.image.size()) {
SpriteAtlasPosition imagePos = spriteAtlas.getPosition(properties.image);
float factor = 8.0 / std::pow(2, state.getIntegerZoom() - id.z);
float fade = std::fmod(state.getZoom(), 1.0);
useProgram(linepatternShader->program);
linepatternShader->u_matrix = vtxMatrix;
linepatternShader->u_exmatrix = extrudeMatrix;
linepatternShader->u_linewidth = {{ outset, inset }};
linepatternShader->u_ratio = ratio;
linepatternShader->u_blur = blur;
linepatternShader->u_pattern_size = {{imagePos.size[0] * factor, imagePos.size[1]}};
linepatternShader->u_pattern_tl = imagePos.tl;
linepatternShader->u_pattern_br = imagePos.br;
linepatternShader->u_fade = fade;
spriteAtlas.bind(true);
MBGL_CHECK_ERROR(glDepthRange(strata + strata_epsilon, 1.0f)); // may or may not matter
bucket.drawLinePatterns(*linepatternShader);
} else {
useProgram(lineShader->program);
lineShader->u_matrix = vtxMatrix;
lineShader->u_exmatrix = extrudeMatrix;
lineShader->u_linewidth = {{ outset, inset }};
lineShader->u_ratio = ratio;
lineShader->u_blur = blur;
lineShader->u_color = color;
lineShader->u_dasharray = {{ dash_length, dash_gap }};
bucket.drawLines(*lineShader);
}
}
void Painter::renderLine(LineBucket& bucket, const StyleLayer &layer_desc, const TileID& id, const mat4 &matrix) {
// Abort early.
if (pass == RenderPass::Opaque) return;
if (!bucket.hasData()) return;
depthMask(false);
const auto &properties = layer_desc.getProperties<LineProperties>();
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 / state.getPixelRatio();
float blur = properties.blur + antialiasing;
float edgeWidth = properties.width / 2.0;
float inset = -1;
float offset = 0;
float shift = 0;
if (properties.gap_width != 0) {
inset = properties.gap_width / 2.0 + antialiasing * 0.5;
edgeWidth = properties.width;
// shift outer lines half a pixel towards the middle to eliminate the crack
offset = inset - antialiasing / 2.0;
}
float outset = offset + edgeWidth + antialiasing / 2.0 + shift;
Color color = properties.color;
color[0] *= properties.opacity;
color[1] *= properties.opacity;
color[2] *= properties.opacity;
color[3] *= properties.opacity;
float ratio = state.getPixelRatio();
mat4 vtxMatrix = translatedMatrix(matrix, properties.translate, id, properties.translateAnchor);
depthRange(strata, 1.0f);
if (properties.dash_array.from.size()) {
useProgram(linesdfShader->program);
linesdfShader->u_matrix = vtxMatrix;
linesdfShader->u_exmatrix = extrudeMatrix;
linesdfShader->u_linewidth = {{ outset, inset }};
linesdfShader->u_ratio = ratio;
linesdfShader->u_blur = blur;
linesdfShader->u_color = color;
LinePatternPos posA = lineAtlas.getDashPosition(properties.dash_array.from, layout.cap == CapType::Round);
LinePatternPos posB = lineAtlas.getDashPosition(properties.dash_array.to, layout.cap == CapType::Round);
lineAtlas.bind();
float patternratio = std::pow(2.0, std::floor(std::log2(state.getScale())) - id.z) / 8.0;
float scaleXA = patternratio / posA.width / properties.dash_line_width / properties.dash_array.fromScale;
float scaleYA = -posA.height / 2.0;
float scaleXB = patternratio / posB.width / properties.dash_line_width / properties.dash_array.toScale;
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_image = 0;
linesdfShader->u_sdfgamma = lineAtlas.width / (properties.dash_line_width * std::min(posA.width, posB.width) * 256.0 * state.getPixelRatio()) / 2;
linesdfShader->u_mix = properties.dash_array.t;
bucket.drawLineSDF(*linesdfShader);
} else if (properties.image.from.size()) {
SpriteAtlasPosition imagePosA = spriteAtlas.getPosition(properties.image.from, true);
SpriteAtlasPosition imagePosB = spriteAtlas.getPosition(properties.image.to, true);
float factor = 8.0 / std::pow(2, state.getIntegerZoom() - id.z);
useProgram(linepatternShader->program);
linepatternShader->u_matrix = vtxMatrix;
linepatternShader->u_exmatrix = extrudeMatrix;
linepatternShader->u_linewidth = {{ outset, inset }};
linepatternShader->u_ratio = ratio;
linepatternShader->u_blur = blur;
linepatternShader->u_pattern_size_a = {{imagePosA.size[0] * factor * properties.image.fromScale, imagePosA.size[1]}};
linepatternShader->u_pattern_tl_a = imagePosA.tl;
linepatternShader->u_pattern_br_a = imagePosA.br;
linepatternShader->u_pattern_size_b = {{imagePosB.size[0] * factor * properties.image.toScale, imagePosB.size[1]}};
linepatternShader->u_pattern_tl_b = imagePosB.tl;
linepatternShader->u_pattern_br_b = imagePosB.br;
linepatternShader->u_fade = properties.image.t;
linepatternShader->u_opacity = properties.opacity;
MBGL_CHECK_ERROR(glActiveTexture(GL_TEXTURE0));
spriteAtlas.bind(true);
MBGL_CHECK_ERROR(glDepthRange(strata + strata_epsilon, 1.0f)); // may or may not matter
bucket.drawLinePatterns(*linepatternShader);
} else {
useProgram(lineShader->program);
lineShader->u_matrix = vtxMatrix;
lineShader->u_exmatrix = extrudeMatrix;
lineShader->u_linewidth = {{ outset, inset }};
lineShader->u_ratio = ratio;
lineShader->u_blur = blur;
lineShader->u_color = color;
bucket.drawLines(*lineShader);
}
}