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export default class Uniform {
/**
* The parent MiniGL controller.
*
* @type {MiniGL}
* @private
*/
gl;
/**
* @type {string}
*/
type;
/**
* @type {*}
*/
value;
/**
* The mapped type function.
*
* @type {string}
*/
typeFn;
/**
* Type function mappings.
*
* @type {object}
* @private
*/
_typeMap = {
float: '1f',
int: '1i',
vec2: '2fv',
vec3: '3fv',
vec4: '4fv',
mat4: 'Matrix4fv'
};
/**
* @param {MiniGL} minigl
* @param {string} type
* @param {*} value
* @param {object} properties
*/
constructor(minigl, type, value, properties = {}) {
// Add additional properties i.e. excludeFrom, transpose... etc
Object.assign(this, properties);
// Set required properties.
this.gl = minigl;
this.type = type;
this.value = value;
// Get type function from map.
this.typeFn = this._typeMap[this.type] || this._typeMap.float;
// Update.
this.update();
}
update(value) {
if (this.value) {
var paramB = this.value;
var paramC = null;
if (this.typeFn.indexOf('Matrix') === 0) {
paramB = this.transpose;
paramC = this.value;
}
this.gl.getContext()[`uniform${this.typeFn}`](value, paramB, paramC);
}
}
getDeclaration(name, type, length) {
if (this.excludeFrom !== type) {
if (this.type === 'array') {
return `${this.value[0].getDeclaration(name, type, this.value.length)}
const int ${name}_length = ${this.value.length};`;
}
if (this.type === 'struct') {
let namePrefix = name.replace('u_', '');
namePrefix = namePrefix.charAt(0).toUpperCase() + namePrefix.slice(1);
const declaration = Object.entries(this.value).map(([name, uniform]) => {
return uniform.getDeclaration(name, type).replace(/^uniform/, '');
}).join('');
return `uniform struct ${namePrefix} {
${declaration}
} ${name}${ length > 0 ? `[${length}]` : '' };`;
}
return `uniform ${this.type} ${name}${ length > 0 ? `[${length}]` : '' };`
}
}
}
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