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phaser/docs/src_pixi_renderers_webgl_shaders_PixiFastShader.js.html
photonstorm 4b22f48c75 2.4.2 release.
2015-07-29 15:01:04 +01:00

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<h1 class="page-title">Source: src/pixi/renderers/webgl/shaders/PixiFastShader.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* @class PixiFastShader
* @constructor
* @param gl {WebGLContext} the current WebGL drawing context
*/
PIXI.PixiFastShader = 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 lowp float;',
'varying vec2 vTextureCoord;',
'varying float vColor;',
'uniform sampler2D uSampler;',
'void main(void) {',
' gl_FragColor = texture2D(uSampler, vTextureCoord) * vColor ;',
'}'
];
/**
* The vertex shader.
* @property vertexSrc
* @type Array
*/
this.vertexSrc = [
'attribute vec2 aVertexPosition;',
'attribute vec2 aPositionCoord;',
'attribute vec2 aScale;',
'attribute float aRotation;',
'attribute vec2 aTextureCoord;',
'attribute float aColor;',
'uniform vec2 projectionVector;',
'uniform vec2 offsetVector;',
'uniform mat3 uMatrix;',
'varying vec2 vTextureCoord;',
'varying float vColor;',
'const vec2 center = vec2(-1.0, 1.0);',
'void main(void) {',
' vec2 v;',
' vec2 sv = aVertexPosition * aScale;',
' v.x = (sv.x) * cos(aRotation) - (sv.y) * sin(aRotation);',
' v.y = (sv.x) * sin(aRotation) + (sv.y) * cos(aRotation);',
' v = ( uMatrix * vec3(v + aPositionCoord , 1.0) ).xy ;',
' gl_Position = vec4( ( v / projectionVector) + center , 0.0, 1.0);',
' vTextureCoord = aTextureCoord;',
// ' vec3 color = mod(vec3(aColor.y/65536.0, aColor.y/256.0, aColor.y), 256.0) / 256.0;',
' vColor = aColor;',
'}'
];
/**
* A local texture counter for multi-texture shaders.
* @property textureCount
* @type Number
*/
this.textureCount = 0;
this.init();
};
PIXI.PixiFastShader.prototype.constructor = PIXI.PixiFastShader;
/**
* Initialises the shader.
*
* @method init
*/
PIXI.PixiFastShader.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.dimensions = gl.getUniformLocation(program, 'dimensions');
this.uMatrix = gl.getUniformLocation(program, 'uMatrix');
// get and store the attributes
this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
this.aPositionCoord = gl.getAttribLocation(program, 'aPositionCoord');
this.aScale = gl.getAttribLocation(program, 'aScale');
this.aRotation = gl.getAttribLocation(program, 'aRotation');
this.aTextureCoord = gl.getAttribLocation(program, 'aTextureCoord');
this.colorAttribute = gl.getAttribLocation(program, 'aColor');
// Begin worst hack eva //
// WHY??? ONLY on my chrome pixel the line above returns -1 when using filters?
// maybe its somthing to do with the current state of the gl context.
// Im convinced this is a bug in the chrome browser as there is NO reason why this should be returning -1 especially as it only manifests on my chrome pixel
// If theres any webGL people that know why could happen please help :)
if(this.colorAttribute === -1)
{
this.colorAttribute = 2;
}
this.attributes = [this.aVertexPosition, this.aPositionCoord, this.aScale, this.aRotation, this.aTextureCoord, this.colorAttribute];
// End worst hack eva //
this.program = program;
};
/**
* Destroys the shader.
*
* @method destroy
*/
PIXI.PixiFastShader.prototype.destroy = function()
{
this.gl.deleteProgram( this.program );
this.uniforms = null;
this.gl = null;
this.attributes = null;
};
</pre>
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