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Improve rendering performance of symbols with symbol-sort-key #9751

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merged 3 commits into from
Aug 11, 2020
Merged

Improve rendering performance of symbols with symbol-sort-key #9751

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73631f5
Dont sort symbol features if they dont overlap
osvodef Jun 3, 2020
f93d8e7
Move canOverlap to SymbolBucket constructor
osvodef Aug 9, 2020
7f5cfdc
Remove leftover function arguments
osvodef Aug 11, 2020
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11 changes: 8 additions & 3 deletions src/data/bucket/symbol_bucket.js
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Original file line number Diff line number Diff line change
Expand Up @@ -322,6 +322,7 @@ class SymbolBucket implements Bucket {
fadeStartTime: number;
sortFeaturesByKey: boolean;
sortFeaturesByY: boolean;
canOverlap: boolean;
sortedAngle: number;
featureSortOrder: Array<number>;

Expand Down Expand Up @@ -367,10 +368,14 @@ class SymbolBucket implements Bucket {
const layout = this.layers[0].layout;
const sortKey = layout.get('symbol-sort-key');
const zOrder = layout.get('symbol-z-order');
this.canOverlap =
layout.get('text-allow-overlap') ||
layout.get('icon-allow-overlap') ||
layout.get('text-ignore-placement') ||
layout.get('icon-ignore-placement');
this.sortFeaturesByKey = zOrder !== 'viewport-y' && sortKey.constantOr(1) !== undefined;
const zOrderByViewportY = zOrder === 'viewport-y' || (zOrder === 'auto' && !this.sortFeaturesByKey);
this.sortFeaturesByY = zOrderByViewportY && (layout.get('text-allow-overlap') || layout.get('icon-allow-overlap') ||
layout.get('text-ignore-placement') || layout.get('icon-ignore-placement'));
this.sortFeaturesByY = zOrderByViewportY && this.canOverlap;

if (layout.get('symbol-placement') === 'point') {
this.writingModes = layout.get('text-writing-mode').map(wm => WritingMode[wm]);
Expand Down Expand Up @@ -618,7 +623,7 @@ class SymbolBucket implements Bucket {
const indexArray = arrays.indexArray;
const layoutVertexArray = arrays.layoutVertexArray;

const segment = arrays.segments.prepareSegment(4 * quads.length, layoutVertexArray, indexArray, feature.sortKey);
const segment = arrays.segments.prepareSegment(4 * quads.length, layoutVertexArray, indexArray, this.canOverlap ? feature.sortKey : undefined);
const glyphOffsetArrayStart = this.glyphOffsetArray.length;
const vertexStartIndex = segment.vertexLength;

Expand Down
6 changes: 4 additions & 2 deletions src/render/draw_symbol.js
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Expand Up @@ -236,7 +236,8 @@ function drawLayerSymbols(painter, sourceCache, layer, coords, isText, translate
// Unpitched point labels need to have their rotation applied after projection
const rotateInShader = rotateWithMap && !pitchWithMap && !alongLine;

const sortFeaturesByKey = layer.layout.get('symbol-sort-key').constantOr(1) !== undefined;
const hasSortKey = layer.layout.get('symbol-sort-key').constantOr(1) !== undefined;
let sortFeaturesByKey = false;

const depthMode = painter.depthModeForSublayer(0, DepthMode.ReadOnly);

Expand Down Expand Up @@ -333,7 +334,8 @@ function drawLayerSymbols(painter, sourceCache, layer, coords, isText, translate
hasHalo
};

if (sortFeaturesByKey) {
if (hasSortKey && bucket.canOverlap) {
sortFeaturesByKey = true;
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I'm just not sure about this particular bit — we need sortFeaturesByKey after this loop, so I had to assign it like this.

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Yeah, this looks good.

const oldSegments = buffers.segments.get();
for (const segment of oldSegments) {
tileRenderState.push({
Expand Down