const utils = require('../utils');

const kernelRunShortcut = require('./kernel-run-shortcut');

///

/// Class: Base

///

/// Represents the 'private/protected' namespace of the GPU class

///

/// *base.js* internal functions namespace

/// *gpu.js* PUBLIC function namespace

///

/// I know @private makes more sense, but since the documentation engine state is undetirmined.

/// (See https://github.com/gpujs/gpu.js/issues/19 regarding documentation engine issue)

/// File isolation is currently the best way to go

///

module.exports = class BaseRunner {

constructor(functionBuilder, settings) {

settings = settings || {};

this.kernel = settings.kernel;

this.canvas = settings.canvas;

this.webGl = settings.webGl;

this.fn = null;

this.functionBuilder = functionBuilder;

this.fnString = null;

this.endianness = utils.systemEndianness;

this.functionBuilder.polyfillStandardFunctions();

}

textureToArray(texture) {

const copy = this.createKernel(function(x) {

return x[this.thread.z][this.thread.y][this.thread.x];

});

return copy(texture);

}

deleteTexture(texture) {

this.webGl.deleteTexture(texture.texture);

}

///

/// Get and returns the ASYNCHRONOUS executor, of a class and kernel

/// This returns a Promise object from an argument set.

///

/// Note that there is no current implementation.

///

buildPromiseKernel() {

throw new Error('not yet implemented');

}

get mode() {

throw new Error('"mode" not implemented on BaseRunner');

}

///

/// Get and returns the Synchronous executor, of a class and kernel

/// Which returns the result directly after passing the arguments.

///

buildKernel(fn, settings) {

settings = Object.assign({}, settings || {});

const fnString = fn.toString();

if (!utils.isFunctionString(fnString)) {

throw 'Unable to get body of kernel function';

}

if (!settings.functionBuilder) {

settings.functionBuilder = this.functionBuilder;

}

if (!settings.canvas) {

settings.canvas = this.canvas;

}

if (!settings.webGl) {

settings.webGl = this.webGl;

}

return kernelRunShortcut(new this.Kernel(fnString, settings));

}

};