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Tilemaps.Components.RunCull is a new function that runs the culling process from the combined bounds and tilemap.

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Richard Davey 2020-10-02 13:47:10 +01:00
parent 83b37de793
commit b11e5fe1fb
1 changed files with 120 additions and 0 deletions
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src/tilemaps/components/RunCull.js Normal file
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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
/**
* Returns the tiles in the given layer that are within the cameras viewport. This is used internally.
*
* @function Phaser.Tilemaps.Components.RunCull
* @since 3.50.0
*
* @param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.
* @param {object} bounds - An object containing the `left`, `right`, `top` and `bottom` bounds.
* @param {integer} renderOrder - The rendering order constant.
* @param {array} outputArray - The array to store the Tile objects within.
*
* @return {Phaser.Tilemaps.Tile[]} An array of Tile objects.
*/
var RunCull = function (layer, bounds, renderOrder, outputArray)
{
var mapData = layer.data;
var mapWidth = layer.width;
var mapHeight = layer.height;
var tilemapLayer = layer.tilemapLayer;
var drawLeft = Math.max(0, bounds.left);
var drawRight = Math.min(mapWidth, bounds.right);
var drawTop = Math.max(0, bounds.top);
var drawBottom = Math.min(mapHeight, bounds.bottom);
var x;
var y;
var tile;
if (renderOrder === 0)
{
// right-down
for (y = drawTop; y < drawBottom; y++)
{
for (x = drawLeft; mapData[y] && x < drawRight; x++)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
else if (renderOrder === 1)
{
// left-down
for (y = drawTop; y < drawBottom; y++)
{
for (x = drawRight; mapData[y] && x >= drawLeft; x--)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
else if (renderOrder === 2)
{
// right-up
for (y = drawBottom; y >= drawTop; y--)
{
for (x = drawLeft; mapData[y] && x < drawRight; x++)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
else if (renderOrder === 3)
{
// left-up
for (y = drawBottom; y >= drawTop; y--)
{
for (x = drawRight; mapData[y] && x >= drawLeft; x--)
{
tile = mapData[y][x];
if (!tile || tile.index === -1 || !tile.visible || tile.alpha === 0)
{
continue;
}
outputArray.push(tile);
}
}
}
tilemapLayer.tilesDrawn = outputArray.length;
tilemapLayer.tilesTotal = mapWidth * mapHeight;
return outputArray;
};
module.exports = RunCull;