phaser-ce/src/pixi/renderers/webgl/utils/WebGLShaderUtils.js

Phaser CE (Community Edition) is a fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers.

/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

/**
 * @method PIXI.initDefaultShaders
 * @static
 * @private
 */
PIXI.initDefaultShaders = function ()
{
};

/**
 * @method PIXI.CompileVertexShader
 * @static
 * @param gl {WebGLContext} the current WebGL drawing context
 * @param shaderSrc {Array}
 * @return {Any}
 */
PIXI.CompileVertexShader = function (gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.VERTEX_SHADER);
};

/**
 * @method PIXI.CompileFragmentShader
 * @static
 * @param gl {WebGLContext} the current WebGL drawing context
 * @param shaderSrc {Array}
 * @return {Any}
 */
PIXI.CompileFragmentShader = function (gl, shaderSrc)
{
    return PIXI._CompileShader(gl, shaderSrc, gl.FRAGMENT_SHADER);
};

/**
 * @method PIXI._CompileShader
 * @static
 * @private
 * @param gl {WebGLContext} the current WebGL drawing context
 * @param shaderSrc {Array}
 * @param shaderType {Number}
 * @return {Any}
 */
PIXI._CompileShader = function (gl, shaderSrc, shaderType)
{
    var src = shaderSrc;

    if (Array.isArray(shaderSrc))
    {
        src = shaderSrc.join('\n');
    }

    var shader = gl.createShader(shaderType);
    gl.shaderSource(shader, src);
    gl.compileShader(shader);

    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
    {
        window.console.log(gl.getShaderInfoLog(shader));
        return null;
    }

    return shader;
};

/**
 * @method PIXI.compileProgram
 * @static
 * @param gl {WebGLContext} the current WebGL drawing context
 * @param vertexSrc {Array}
 * @param fragmentSrc {Array}
 * @return {Any}
 */
PIXI.compileProgram = function (gl, vertexSrc, fragmentSrc)
{
    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))
    {
        window.console.log(gl.getProgramInfoLog(shaderProgram));
        window.console.log('Could not initialise shaders');
    }

    return shaderProgram;
};