/*
* Returns a matrix for converting from tile units to the correct label coordinate space.
*/
mat4 getLabelPlaneMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits) {
mat4 m;
matrix::identity(m);
if (pitchWithMap) {
matrix::scale(m, m, 1 / pixelsToTileUnits, 1 / pixelsToTileUnits, 1);
if (!rotateWithMap) {
matrix::rotate_z(m, m, state.getBearing());
}
} else {
matrix::scale(m, m, state.getSize().width / 2.0, -(state.getSize().height / 2.0), 1.0);
matrix::translate(m, m, 1, -1, 0);
matrix::multiply(m, m, posMatrix);
}
return m;
}
void reprojectLineLabels(gfx::VertexVector<gfx::Vertex<SymbolDynamicLayoutAttributes>>& dynamicVertexArray, const std::vector<PlacedSymbol>& placedSymbols,
const mat4& posMatrix, bool pitchWithMap, bool rotateWithMap, bool keepUpright,
const RenderTile& tile, const SymbolSizeBinder& sizeBinder, const TransformState& state) {
const ZoomEvaluatedSize partiallyEvaluatedSize = sizeBinder.evaluateForZoom(state.getZoom());
const std::array<double, 2> clippingBuffer = {{ 256.0 / state.getSize().width * 2.0 + 1.0, 256.0 / state.getSize().height * 2.0 + 1.0 }};
const float pixelsToTileUnits = tile.id.pixelsToTileUnits(1, state.getZoom());
const mat4 labelPlaneMatrix = getLabelPlaneMatrix(posMatrix, pitchWithMap,
rotateWithMap, state, pixelsToTileUnits);
const mat4 glCoordMatrix = getGlCoordMatrix(posMatrix, pitchWithMap, rotateWithMap, state, pixelsToTileUnits);
dynamicVertexArray.clear();
bool useVertical = false;
for (auto& placedSymbol : placedSymbols) {
// Don't do calculations for vertical glyphs unless the previous symbol was horizontal
// and we determined that vertical glyphs were necessary.
// Also don't do calculations for symbols that are collided and fully faded out
if (placedSymbol.hidden || (placedSymbol.writingModes == WritingModeType::Vertical && !useVertical)) {
hideGlyphs(placedSymbol.glyphOffsets.size(), dynamicVertexArray);
continue;
}
// Awkward... but we're counting on the paired "vertical" symbol coming immediately after its horizontal counterpart
useVertical = false;
vec4 anchorPos = {{ placedSymbol.anchorPoint.x, placedSymbol.anchorPoint.y, 0, 1 }};
matrix::transformMat4(anchorPos, anchorPos, posMatrix);
// Don't bother calculating the correct point for invisible labels.
if (!isVisible(anchorPos, clippingBuffer)) {
hideGlyphs(placedSymbol.glyphOffsets.size(), dynamicVertexArray);
continue;
}
const float cameraToAnchorDistance = anchorPos[3];
const float perspectiveRatio = 0.5 + 0.5 * (cameraToAnchorDistance / state.getCameraToCenterDistance());
const float fontSize = evaluateSizeForFeature(partiallyEvaluatedSize, placedSymbol);
const float pitchScaledFontSize = pitchWithMap ?
fontSize * perspectiveRatio :
fontSize / perspectiveRatio;
const Point<float> anchorPoint = project(placedSymbol.anchorPoint, labelPlaneMatrix).first;
PlacementResult placeUnflipped = placeGlyphsAlongLine(placedSymbol, pitchScaledFontSize, false /*unflipped*/, keepUpright, posMatrix, labelPlaneMatrix, glCoordMatrix, dynamicVertexArray, anchorPoint, state.getSize().aspectRatio());
useVertical = placeUnflipped == PlacementResult::UseVertical;
if (placeUnflipped == PlacementResult::NotEnoughRoom || useVertical ||
(placeUnflipped == PlacementResult::NeedsFlipping &&
placeGlyphsAlongLine(placedSymbol, pitchScaledFontSize, true /*flipped*/, keepUpright, posMatrix, labelPlaneMatrix, glCoordMatrix, dynamicVertexArray, anchorPoint, state.getSize().aspectRatio()) == PlacementResult::NotEnoughRoom)) {
hideGlyphs(placedSymbol.glyphOffsets.size(), dynamicVertexArray);
}
}
}
std::vector<UnwrappedTileID> tileCover(const TransformState& state, int32_t z) {
assert(state.valid());
const double w = state.getSize().width;
const double h = state.getSize().height;
return tileCover(
TileCoordinate::fromScreenCoordinate(state, z, { 0, 0 }).p,
TileCoordinate::fromScreenCoordinate(state, z, { w, 0 }).p,
TileCoordinate::fromScreenCoordinate(state, z, { w, h }).p,
TileCoordinate::fromScreenCoordinate(state, z, { 0, h }).p,
TileCoordinate::fromScreenCoordinate(state, z, { w/2, h/2 }).p,
z);
}
