pixi.js/docs/files/src_pixi_renderers_webgl_shaders_PrimitiveShader.js.html
Mat Groves 847eb6c48e Docs updated
Fixed issue where alpha not being set correctly in canvas spriteBatch
Fixed issue where previous stage events did not get removed correctly
2014-01-28 00:08:50 +00:00

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<h1 class="file-heading">File: src/pixi/renderers/webgl/shaders/PrimitiveShader.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
PIXI.PrimitiveShader = function(gl)
{
this.gl = gl;
// the webGL program..
this.program = null;
this.fragmentSrc = [
&#x27;precision mediump float;&#x27;,
&#x27;varying vec4 vColor;&#x27;,
&#x27;void main(void) {&#x27;,
&#x27; gl_FragColor = vColor;&#x27;,
&#x27;}&#x27;
];
this.vertexSrc = [
&#x27;attribute vec2 aVertexPosition;&#x27;,
&#x27;attribute vec4 aColor;&#x27;,
&#x27;uniform mat3 translationMatrix;&#x27;,
&#x27;uniform vec2 projectionVector;&#x27;,
&#x27;uniform vec2 offsetVector;&#x27;,
&#x27;uniform float alpha;&#x27;,
&#x27;uniform vec3 tint;&#x27;,
&#x27;varying vec4 vColor;&#x27;,
&#x27;void main(void) {&#x27;,
&#x27; vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);&#x27;,
&#x27; v -= offsetVector.xyx;&#x27;,
&#x27; gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);&#x27;,
&#x27; vColor = aColor * vec4(tint * alpha, alpha);&#x27;,
&#x27;}&#x27;
];
this.init();
};
PIXI.PrimitiveShader.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.projectionVector = gl.getUniformLocation(program, &#x27;projectionVector&#x27;);
this.offsetVector = gl.getUniformLocation(program, &#x27;offsetVector&#x27;);
this.tintColor = gl.getUniformLocation(program, &#x27;tint&#x27;);
// get and store the attributes
this.aVertexPosition = gl.getAttribLocation(program, &#x27;aVertexPosition&#x27;);
this.colorAttribute = gl.getAttribLocation(program, &#x27;aColor&#x27;);
this.attributes = [this.aVertexPosition, this.colorAttribute];
this.translationMatrix = gl.getUniformLocation(program, &#x27;translationMatrix&#x27;);
this.alpha = gl.getUniformLocation(program, &#x27;alpha&#x27;);
this.program = program;
};
PIXI.PrimitiveShader.prototype.destroy = function()
{
this.gl.deleteProgram( this.program );
this.uniforms = null;
this.gl = null;
this.attribute = null;
};
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