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<h1 class="file-heading">File: src/pixi/renderers/webgl/shaders/StripShader.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* @class StripShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.StripShader = function(gl)
{
/**
* @property _UID
* @type Number
* @private
*/
this._UID = PIXI._UID++;
/**
* @property gl
* @type WebGLContext
*/
this.gl = gl;
/**
* The WebGL program.
* @property program
* @type {Any}
*/
this.program = null;
/**
* The fragment shader.
* @property fragmentSrc
* @type Array
*/
this.fragmentSrc = [
'precision mediump float;',
'varying vec2 vTextureCoord;',
// 'varying float vColor;',
'uniform float alpha;',
'uniform sampler2D uSampler;',
'void main(void) {',
' gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.x, vTextureCoord.y)) * alpha;',
// ' gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);',//gl_FragColor * alpha;',
'}'
];
/**
* The vertex shader.
* @property vertexSrc
* @type Array
*/
this.vertexSrc = [
'attribute vec2 aVertexPosition;',
'attribute vec2 aTextureCoord;',
'uniform mat3 translationMatrix;',
'uniform vec2 projectionVector;',
'uniform vec2 offsetVector;',
// 'uniform float alpha;',
// 'uniform vec3 tint;',
'varying vec2 vTextureCoord;',
// 'varying vec4 vColor;',
'void main(void) {',
' vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);',
' v -= offsetVector.xyx;',
' gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);',
' vTextureCoord = aTextureCoord;',
// ' vColor = aColor * vec4(tint * alpha, alpha);',
'}'
];
this.init();
};
PIXI.StripShader.prototype.constructor = PIXI.StripShader;
/**
* Initialises the shader.
*
* @method init
*/
PIXI.StripShader.prototype.init = function()
{
var gl = this.gl;
var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
gl.useProgram(program);
// get and store the uniforms for the shader
this.uSampler = gl.getUniformLocation(program, 'uSampler');
this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
this.colorAttribute = gl.getAttribLocation(program, 'aColor');
//this.dimensions = gl.getUniformLocation(this.program, 'dimensions');
// get and store the attributes
this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
this.aTextureCoord = gl.getAttribLocation(program, 'aTextureCoord');
this.attributes = [this.aVertexPosition, this.aTextureCoord];
this.translationMatrix = gl.getUniformLocation(program, 'translationMatrix');
this.alpha = gl.getUniformLocation(program, 'alpha');
this.program = program;
};
/**
* Destroys the shader.
*
* @method destroy
*/
PIXI.StripShader.prototype.destroy = function()
{
this.gl.deleteProgram( this.program );
this.uniforms = null;
this.gl = null;
this.attribute = null;
};
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