import System from '../System';
import GLTexture from './GLTexture';
import { removeItems } from '@pixi/utils';
/**
* @class
* @extends PIXI.System
* @memberof PIXI.systems
*/
export default class TextureSystem extends System
{
/**
* @param {PIXI.Renderer} renderer - The renderer this System works for.
*/
constructor(renderer)
{
super(renderer);
// TODO set to max textures...
/**
* Bound textures
* @member {PIXI.BaseTexture[]}
* @readonly
*/
this.boundTextures = [];
/**
* Current location
* @member {number}
* @readonly
*/
this.currentLocation = -1;
/**
* List of managed textures
* @member {PIXI.BaseTextures[]}
* @readonly
*/
this.managedTextures = [];
}
/**
* Sets up the renderer context and necessary buffers.
*
* @private
*/
contextChange()
{
const gl = this.gl = this.renderer.gl;
this.CONTEXT_UID = this.renderer.CONTEXT_UID;
const maxTextures = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS);
this.boundTextures.length = maxTextures;
for (let i = 0; i < maxTextures; i++)
{
this.boundTextures[i] = null;
}
// TODO move this.. to a nice make empty textures class..
this.emptyTextures = {};
const emptyTexture2D = new GLTexture(gl.createTexture());
gl.bindTexture(gl.TEXTURE_2D, emptyTexture2D.texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
this.emptyTextures[gl.TEXTURE_2D] = emptyTexture2D;
this.emptyTextures[gl.TEXTURE_CUBE_MAP] = new GLTexture(gl.createTexture());
gl.bindTexture(gl.TEXTURE_CUBE_MAP, this.emptyTextures[gl.TEXTURE_CUBE_MAP].texture);
for (let i = 0; i < 6; i++)
{
gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
}
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
for (let i = 0; i < this.boundTextures.length; i++)
{
this.bind(null, i);
}
}
/**
* Bind a texture to a specific location
*
* @param {PIXI.Texture|PIXI.BaseTexture} texture - Texture to bind
* @param {number} [location=0] - Location to bind at
*/
bind(texture, location = 0)
{
const { gl } = this;
if (this.currentLocation !== location)
{
this.currentLocation = location;
gl.activeTexture(gl.TEXTURE0 + location);
}
if (texture)
{
texture = texture.baseTexture || texture;
if (texture.valid)
{
texture.touched = this.renderer.textureGC.count;
const glTexture = texture._glTextures[this.CONTEXT_UID] || this.initTexture(texture);
if (this.boundTextures[location] !== texture)
{
gl.bindTexture(texture.target, glTexture.texture);
}
if (glTexture.dirtyId !== texture.dirtyId)
{
this.updateTexture(texture);
}
this.boundTextures[location] = texture;
}
}
else
{
gl.bindTexture(gl.TEXTURE_2D, this.emptyTextures[gl.TEXTURE_2D].texture);
this.boundTextures[location] = null;
}
}
/**
* Unbind a texture
* @param {PIXI.Texture|PIXI.BaseTexture} texture - Texture to bind
*/
unbind(texture)
{
const { gl } = this;
for (let i = 0; i < this.boundTextures.length; i++)
{
if (this.boundTextures[i] === texture)
{
if (this.currentLocation !== i)
{
gl.activeTexture(gl.TEXTURE0 + i);
this.currentLocation = i;
}
gl.bindTexture(gl.TEXTURE_2D, this.emptyTextures[texture.target].texture);
this.boundTextures[i] = null;
}
}
}
/**
* Initialize a texture
*
* @private
* @param {PIXI.BaseTexture} texture - Texture to initialize
*/
initTexture(texture)
{
const glTexture = new GLTexture(this.gl.createTexture());
// guarantee an update..
glTexture.dirtyId = -1;
texture._glTextures[this.CONTEXT_UID] = glTexture;
this.managedTextures.push(texture);
texture.on('dispose', this.destroyTexture, this);
return glTexture;
}
/**
* Update a texture
*
* @private
* @param {PIXI.BaseTexture} texture - Texture to initialize
*/
updateTexture(texture)
{
const glTexture = texture._glTextures[this.CONTEXT_UID];
const renderer = this.renderer;
if (texture.resource && texture.resource.upload(renderer, texture, glTexture))
{
// texture is uploaded, dont do anything!
}
else
{
// default, renderTexture-like logic
const width = texture.realWidth;
const height = texture.realHeight;
const gl = renderer.gl;
if (glTexture.width !== width
|| glTexture.height !== height
|| glTexture.dirtyId < 0)
{
glTexture.width = width;
glTexture.height = height;
gl.texImage2D(texture.target, 0,
texture.format,
width,
height,
0,
texture.format,
texture.type,
null);
}
}
// lets only update what changes..
if (texture.dirtyStyleId !== glTexture.dirtyStyleId)
{
this.updateTextureStyle(texture);
}
glTexture.dirtyId = texture.dirtyId;
}
/**
* Deletes the texture from WebGL
*
* @private
* @param {PIXI.BaseTexture|PIXI.Texture} texture - the texture to destroy
* @param {boolean} [skipRemove=false] - Whether to skip removing the texture from the TextureManager.
*/
destroyTexture(texture, skipRemove)
{
const { gl } = this;
texture = texture.baseTexture || texture;
if (texture._glTextures[this.renderer.CONTEXT_UID])
{
this.unbind(texture);
gl.deleteTexture(texture._glTextures[this.renderer.CONTEXT_UID].texture);
texture.off('dispose', this.destroyTexture, this);
delete texture._glTextures[this.renderer.CONTEXT_UID];
if (!skipRemove)
{
const i = this.managedTextures.indexOf(texture);
if (i !== -1)
{
removeItems(this.managedTextures, i, 1);
}
}
}
}
/**
* Update texture style such as mipmap flag
*
* @private
* @param {PIXI.BaseTexture} texture - Texture to update
*/
updateTextureStyle(texture)
{
const glTexture = texture._glTextures[this.CONTEXT_UID];
glTexture.mipmap = texture.mipmap && texture.isPowerOfTwo;
if (!glTexture)
{
return;
}
if (texture.resource && texture.resource.style(this.renderer, texture, glTexture))
{
// style is set, dont do anything!
}
else
{
this.setStyle(texture, glTexture);
}
glTexture.dirtyStyleId = texture.dirtyStyleId;
}
/**
* Set style for texture
*
* @private
* @param {PIXI.BaseTexture} texture - Texture to update
* @param {glTexture} glTexture
*/
setStyle(texture, glTexture)
{
const gl = this.gl;
if (glTexture.mipmap)
{
gl.generateMipmap(texture.target);
}
gl.texParameteri(texture.target, gl.TEXTURE_WRAP_S, texture.wrapMode);
gl.texParameteri(texture.target, gl.TEXTURE_WRAP_T, texture.wrapMode);
if (glTexture.mipmap)
{
/* eslint-disable max-len */
gl.texParameteri(texture.target, gl.TEXTURE_MIN_FILTER, texture.scaleMode ? gl.LINEAR_MIPMAP_LINEAR : gl.NEAREST_MIPMAP_NEAREST);
/* eslint-disable max-len */
}
else
{
gl.texParameteri(texture.target, gl.TEXTURE_MIN_FILTER, texture.scaleMode ? gl.LINEAR : gl.NEAREST);
}
gl.texParameteri(texture.target, gl.TEXTURE_MAG_FILTER, texture.scaleMode ? gl.LINEAR : gl.NEAREST);
}
}
