105 lines
2.4 KiB
JavaScript
105 lines
2.4 KiB
JavaScript
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/**
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* @author Mat Groves http://matgroves.com/ @Doormat23
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*/
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/**
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* @class PrimitiveShader
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* @constructor
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* @param gl {WebGLContext} the current WebGL drawing context
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*/
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PIXI.PrimitiveShader = function(gl)
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{
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/**
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* @property gl
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* @type WebGLContext
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*/
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this.gl = gl;
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/**
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* @property {any} program - The WebGL program.
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*/
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this.program = null;
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/**
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* @property fragmentSrc
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* @type Array
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*/
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this.fragmentSrc = [
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'precision mediump float;',
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'varying vec4 vColor;',
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'void main(void) {',
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' gl_FragColor = vColor;',
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'}'
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];
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/**
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* @property vertexSrc
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* @type Array
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*/
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this.vertexSrc = [
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'attribute vec2 aVertexPosition;',
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'attribute vec4 aColor;',
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'uniform mat3 translationMatrix;',
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'uniform vec2 projectionVector;',
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'uniform vec2 offsetVector;',
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'uniform float alpha;',
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'uniform vec3 tint;',
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'varying vec4 vColor;',
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'void main(void) {',
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' vec3 v = translationMatrix * vec3(aVertexPosition , 1.0);',
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' v -= offsetVector.xyx;',
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' gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);',
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' vColor = aColor * vec4(tint * alpha, alpha);',
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'}'
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];
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this.init();
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};
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/**
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* Initialises the shader
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* @method init
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*
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*/
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PIXI.PrimitiveShader.prototype.init = function()
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{
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var gl = this.gl;
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var program = PIXI.compileProgram(gl, this.vertexSrc, this.fragmentSrc);
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gl.useProgram(program);
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// get and store the uniforms for the shader
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this.projectionVector = gl.getUniformLocation(program, 'projectionVector');
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this.offsetVector = gl.getUniformLocation(program, 'offsetVector');
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this.tintColor = gl.getUniformLocation(program, 'tint');
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// get and store the attributes
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this.aVertexPosition = gl.getAttribLocation(program, 'aVertexPosition');
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this.colorAttribute = gl.getAttribLocation(program, 'aColor');
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this.attributes = [this.aVertexPosition, this.colorAttribute];
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this.translationMatrix = gl.getUniformLocation(program, 'translationMatrix');
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this.alpha = gl.getUniformLocation(program, 'alpha');
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this.program = program;
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};
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/**
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* Destroys the shader
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* @method destroy
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*
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*/
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PIXI.PrimitiveShader.prototype.destroy = function()
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{
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this.gl.deleteProgram( this.program );
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this.uniforms = null;
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this.gl = null;
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this.attribute = null;
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};
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