/*
* File: LightShader.js
* Subclass from SpriteShader
* Supports light illumination
*/
/*jslint node: true, vars: true */
/*global gEngine, SpriteShader, ShaderLightAtIndex, vec4 */
/* find out more about jslint: http://www.jslint.com/help.html */
"use strict"; // Operate in Strict mode such that variables must be declared before used!
//<editor-fold desc="constructor">
/**
* Default Constructor<p>
* Subclass from SpriteShader<p>
* Supports light illumination
* @param {String} vertexShaderPath Vertex Shader file path
* @param {String} fragmentShaderPath Fragment shader file path
* @returns {LightShader} New instance of LightShader
* @class LightShader
*/
function LightShader(vertexShaderPath, fragmentShaderPath) {
// Call super class constructor
SpriteShader.call(this, vertexShaderPath, fragmentShaderPath); // call SimpleShader constructor
this.mLights = null; // lights from the Renderable
//*******WARNING***************
// this number MUST correspond to the GLSL uLight[] array size (for LightFS.glsl and IllumFS.glsl)
//*******WARNING********************
this.kGLSLuLightArraySize = 4; // <-- make sure this is the same as LightFS.glsl and IllumFS.glsl
this.mShaderLights = [];
var i, ls;
for (i = 0; i < this.kGLSLuLightArraySize; i++) {
ls = new ShaderLightAtIndex(this.mCompiledShader, i);
this.mShaderLights.push(ls);
}
}
gEngine.Core.inheritPrototype(LightShader, SpriteShader);
//</editor-fold>
// <editor-fold desc="Public Methods">
// Overriding the Activation of the shader for rendering
/**
* Activate the shader for rendering.
* @param {float[]} pixelColor [R, G, B, A] Sets the shader pixel color.
* @param {Camera} aCamera Camera to draw to
* @returns {void}
* @memberOf LightShader
*/
LightShader.prototype.activateShader = function (pixelColor, aCamera) {
// first call the super class's activate
SpriteShader.prototype.activateShader.call(this, pixelColor, aCamera);
// now push the light information to the shader
var numLight = 0;
if (this.mLights !== null) {
while (numLight < this.mLights.length) {
this.mShaderLights[numLight].loadToShader(aCamera, this.mLights[numLight]);
numLight++;
}
}
// switch off the left over ones.
while (numLight < this.kGLSLuLightArraySize) {
this.mShaderLights[numLight].switchOffLight(); // switch off unused lights
numLight++;
}
};
/**
* Set the Shader lights
* @param {Light[]} l Shader lights
* @returns {void}
* @memberOf LightShader
*/
LightShader.prototype.setLights = function (l) {
this.mLights = l;
};
//</editor-fold>