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<title>src/pixi/renderers/webgl/WebGLShaders.js - Pixi.JS</title>
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<h1 class="file-heading">File: src/pixi/renderers/webgl/WebGLShaders.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/*
* the default suoer fast shader!
*/
PIXI.shaderFragmentSrc = [
"precision mediump float;",
"varying vec2 vTextureCoord;",
"varying float vColor;",
"uniform sampler2D uSampler;",
"void main(void) {",
"gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.x, vTextureCoord.y));",
"gl_FragColor = gl_FragColor * vColor;",
"}"
];
PIXI.shaderVertexSrc = [
"attribute vec2 aVertexPosition;",
"attribute vec2 aTextureCoord;",
"attribute float aColor;",
//"uniform mat4 uMVMatrix;",
"uniform vec2 projectionVector;",
"varying vec2 vTextureCoord;",
"varying float vColor;",
"void main(void) {",
// "gl_Position = uMVMatrix * vec4(aVertexPosition, 1.0, 1.0);",
"gl_Position = vec4( aVertexPosition.x / projectionVector.x -1.0, aVertexPosition.y / -projectionVector.y + 1.0 , 0.0, 1.0);",
"vTextureCoord = aTextureCoord;",
"vColor = aColor;",
"}"
];
/*
* the triangle strip shader..
*/
PIXI.stripShaderFragmentSrc = [
"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));",
"gl_FragColor = gl_FragColor * alpha;",
"}"
];
PIXI.stripShaderVertexSrc = [
"attribute vec2 aVertexPosition;",
"attribute vec2 aTextureCoord;",
"attribute float aColor;",
"uniform mat3 translationMatrix;",
"uniform vec2 projectionVector;",
"varying vec2 vTextureCoord;",
"varying float vColor;",
"void main(void) {",
"vec3 v = translationMatrix * vec3(aVertexPosition, 1.0);",
"gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);",
"vTextureCoord = aTextureCoord;",
"vColor = aColor;",
"}"
];
/*
* primitive shader..
*/
PIXI.primitiveShaderFragmentSrc = [
"precision mediump float;",
"varying vec4 vColor;",
"void main(void) {",
"gl_FragColor = vColor;",
"}"
];
PIXI.primitiveShaderVertexSrc = [
"attribute vec2 aVertexPosition;",
"attribute vec4 aColor;",
"uniform mat3 translationMatrix;",
"uniform vec2 projectionVector;",
"uniform float alpha;",
"varying vec4 vColor;",
"void main(void) {",
"vec3 v = translationMatrix * vec3(aVertexPosition, 1.0);",
"gl_Position = vec4( v.x / projectionVector.x -1.0, v.y / -projectionVector.y + 1.0 , 0.0, 1.0);",
"vColor = aColor * alpha;",
"}"
];
PIXI.initPrimitiveShader = function()
{
return;
var gl = PIXI.gl;
var shaderProgram = PIXI.compileProgram(PIXI.primitiveShaderVertexSrc, PIXI.primitiveShaderFragmentSrc)
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
shaderProgram.colorAttribute = gl.getAttribLocation(shaderProgram, "aColor");
shaderProgram.projectionVector = gl.getUniformLocation(shaderProgram, "projectionVector");
shaderProgram.translationMatrix = gl.getUniformLocation(shaderProgram, "translationMatrix");
shaderProgram.alpha = gl.getUniformLocation(shaderProgram, "alpha");
PIXI.primitiveProgram = shaderProgram;
}
PIXI.initDefaultShader = function()
{
var gl = this.gl;
var shaderProgram = PIXI.compileProgram(PIXI.shaderVertexSrc, PIXI.shaderFragmentSrc)
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
shaderProgram.projectionVector = gl.getUniformLocation(shaderProgram, "projectionVector");
shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
shaderProgram.colorAttribute = gl.getAttribLocation(shaderProgram, "aColor");
// shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
PIXI.shaderProgram = shaderProgram;
}
PIXI.initDefaultStripShader = function()
{
var gl = this.gl;
var shaderProgram = PIXI.compileProgram(PIXI.stripShaderVertexSrc, PIXI.stripShaderFragmentSrc)
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
shaderProgram.projectionVector = gl.getUniformLocation(shaderProgram, "projectionVector");
shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
shaderProgram.translationMatrix = gl.getUniformLocation(shaderProgram, "translationMatrix");
shaderProgram.alpha = gl.getUniformLocation(shaderProgram, "alpha");
shaderProgram.colorAttribute = gl.getAttribLocation(shaderProgram, "aColor");
shaderProgram.projectionVector = gl.getUniformLocation(shaderProgram, "projectionVector");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
PIXI.stripShaderProgram = shaderProgram;
}
PIXI.CompileVertexShader = function(gl, shaderSrc)
{
return PIXI._CompileShader(gl, shaderSrc, gl.VERTEX_SHADER);
}
PIXI.CompileFragmentShader = function(gl, shaderSrc)
{
return PIXI._CompileShader(gl, shaderSrc, gl.FRAGMENT_SHADER);
}
PIXI._CompileShader = function(gl, shaderSrc, shaderType)
{
var src = shaderSrc.join("\n");
var shader = gl.createShader(shaderType);
gl.shaderSource(shader, src);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
PIXI.activateDefaultShader = function()
{
var gl = PIXI.gl;
var shaderProgram = PIXI.shaderProgram;
gl.useProgram(shaderProgram);
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
gl.enableVertexAttribArray(shaderProgram.colorAttribute);
}
PIXI.compileProgram = function(vertexSrc, fragmentSrc)
{
var gl = PIXI.gl;
var fragmentShader = PIXI.CompileFragmentShader(gl, fragmentSrc);
var vertexShader = PIXI.CompileVertexShader(gl, vertexSrc);
var shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
return shaderProgram;
}
PIXI.activatePrimitiveShader = function()
{
var gl = PIXI.gl;
gl.disableVertexAttribArray(PIXI.shaderProgram.textureCoordAttribute);
gl.disableVertexAttribArray(PIXI.shaderProgram.colorAttribute);
gl.useProgram(PIXI.primitiveProgram);
gl.enableVertexAttribArray(PIXI.primitiveProgram.vertexPositionAttribute);
gl.enableVertexAttribArray(PIXI.primitiveProgram.colorAttribute);
}
</pre>
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