import { System } from '../System';
import { GC_MODES } from '@pixi/constants';
import { settings } from '@pixi/settings';
import type { Renderer } from '../Renderer';
import type { Texture } from './Texture';
import type { RenderTexture } from '../renderTexture/RenderTexture';
export interface IUnloadableTexture {
_texture: Texture | RenderTexture;
children: IUnloadableTexture[];
}
/**
* System plugin to the renderer to manage texture garbage collection on the GPU,
* ensuring that it does not get clogged up with textures that are no longer being used.
*
* @class
* @memberof PIXI
* @extends PIXI.System
*/
export class TextureGCSystem extends System
{
public count: number;
public checkCount: number;
public maxIdle: number;
public checkCountMax: number;
public mode: number;
/**
* @param {PIXI.Renderer} renderer - The renderer this System works for.
*/
constructor(renderer: Renderer)
{
super(renderer);
/**
* Count
* @member {number}
* @readonly
*/
this.count = 0;
/**
* Check count
* @member {number}
* @readonly
*/
this.checkCount = 0;
/**
* Maximum idle time, in seconds
* @member {number}
* @see PIXI.settings.GC_MAX_IDLE
*/
this.maxIdle = settings.GC_MAX_IDLE;
/**
* Maximum number of item to check
* @member {number}
* @see PIXI.settings.GC_MAX_CHECK_COUNT
*/
this.checkCountMax = settings.GC_MAX_CHECK_COUNT;
/**
* Current garabage collection mode
* @member {PIXI.GC_MODES}
* @see PIXI.settings.GC_MODE
*/
this.mode = settings.GC_MODE;
}
/**
* Checks to see when the last time a texture was used
* if the texture has not been used for a specified amount of time it will be removed from the GPU
*/
protected postrender(): void
{
if (!this.renderer.renderingToScreen)
{
return;
}
this.count++;
if (this.mode === GC_MODES.MANUAL)
{
return;
}
this.checkCount++;
if (this.checkCount > this.checkCountMax)
{
this.checkCount = 0;
this.run();
}
}
/**
* Checks to see when the last time a texture was used
* if the texture has not been used for a specified amount of time it will be removed from the GPU
*/
run(): void
{
const tm = this.renderer.texture;
const managedTextures = tm.managedTextures;
let wasRemoved = false;
for (let i = 0; i < managedTextures.length; i++)
{
const texture = managedTextures[i];
// only supports non generated textures at the moment!
if (!(texture as any).framebuffer && this.count - texture.touched > this.maxIdle)
{
tm.destroyTexture(texture, true);
managedTextures[i] = null;
wasRemoved = true;
}
}
if (wasRemoved)
{
let j = 0;
for (let i = 0; i < managedTextures.length; i++)
{
if (managedTextures[i] !== null)
{
managedTextures[j++] = managedTextures[i];
}
}
managedTextures.length = j;
}
}
/**
* Removes all the textures within the specified displayObject and its children from the GPU
*
* @param {PIXI.DisplayObject} displayObject - the displayObject to remove the textures from.
*/
unload(displayObject: IUnloadableTexture): void
{
const tm = this.renderer.texture;
// only destroy non generated textures
if ((displayObject._texture as RenderTexture)?.framebuffer)
{
tm.destroyTexture(displayObject._texture);
}
for (let i = displayObject.children.length - 1; i >= 0; i--)
{
this.unload(displayObject.children[i]);
}
}
}