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<h1 class="file-heading">File: src\render\GLTextureWrapper.ts</h1>
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<pre class="code prettyprint linenums">
/**
*
* @module Kiwi
* @submodule Renderers
*
* @namespace Kiwi.Renderers
*/
module Kiwi.Renderers {
/**
* Wraps a webGL texture object
* @class GLTextureWrapper
* @constructor
* @param gl {WebGLRenderingContext}
* @param atlas {Kiwi.Textures.TextureAtlas} The wrapper will default to wrapping atlas.image.
* @return {Kiwi.Renderers.GLTextureWrapper}
*/
export class GLTextureWrapper {
constructor(gl: WebGLRenderingContext, atlas: Kiwi.Textures.TextureAtlas,upload:boolean = false) {
this.textureAtlas = atlas;
this._image = atlas.image;
this._numBytes = this._image.width * this._image.height * 4;
this.createTexture(gl);
if (upload) this.uploadTexture(gl);
}
/**
* The textureAtlas used by the GLTexture
* @property textureAtlas
* @type Kiwi.Textures.TextureAtlas
*/
public textureAtlas: Kiwi.Textures.TextureAtlas;
/**
* The number of bytes in the texture
* @property numBytes
* @type Kiwi.Textures.TextureAtlas
*/
private _numBytes: number;
public get numBytes(): number {
return this._numBytes;
}
/**
* Returns whether the texture has been created
* @property created
* @type boolean
*/
private _created: boolean = false;
public get created(): boolean {
return this._created;
}
/**
* Returns whether the texture has been uploaded to video memory
* @property uploaded
* @type boolean
*/
private _uploaded: boolean = false;
public get uploaded(): boolean {
return this._uploaded;
}
/**
*
* @property texture
* @type WebGLTexture
* @public
*/
public texture: WebGLTexture;
/**
* The image wrapped by this wrapper.
* @property _image
* @type HTMLImageElement
* @private
*/
private _image: HTMLImageElement;
/**
* The image wrapped by this wrapper.
* @property image
* @type HTMLImageElement
* @public
*/
public get image(): HTMLImageElement {
return( this._image );
}
public set image(image: HTMLImageElement) {
this._image = image;
this._numBytes = this._image.width * this._image.height * 4;
this._uploaded = false;
}
/**
* Creates a webgl texture object
* @method createTexture
* @param gl {WebGLRenderingContext}
* @public
*/
public createTexture(gl: WebGLRenderingContext): boolean {
this.texture = gl.createTexture();
this._created = true;
return true;
}
/**
* Uploads a webgl texture object to video memory
* @method uploadTexture
* @param gl {WebGLRenderingContext}
* @public
*/
public uploadTexture(gl: WebGLRenderingContext):boolean {
var success: boolean = false;
if (!this.created) {
this.createTexture(gl);
}
if (this.uploaded) {
Kiwi.Log.log("...not uploading:the image is already uploaded.", '#renderer', '#webgl');
} else {
gl.bindTexture(gl.TEXTURE_2D, this.texture);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 0);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, this._image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.bindTexture(gl.TEXTURE_2D, null);
//check gl error here
this._uploaded = true;
success = true;
}
return success;
}
/**
* Re-uploads a webgl texture object to video memory
* @method refreshTexture
* @param gl {WebGLRenderingContext}
* @public
*/
public refreshTexture(gl: WebGLRenderingContext) {
this.numBytes = this._image.width * this._image.height * 4;
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, this._image);
}
/**
* Deletes a webgl texture
* @method deleteTexture
* @param gl {WebGLRenderingContext}
* @public
*/
public deleteTexture(gl: WebGLRenderingContext) :boolean{
gl.deleteTexture(this.texture);
this._uploaded = false;
this._created = false;
return true;
}
}
}
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