/**

* @desc WebGl Texture implementation in JS

* @param {ITextureSettings} settings

*/

class Texture {

constructor(settings) {

const {

texture,

size,

dimensions,

output,

context,

gpu,

type = 'NumberTexture',

} = settings;

if (!output) throw new Error('settings property "output" required.');

if (!context) throw new Error('settings property "context" required.');

this.texture = texture;

this.size = size;

this.dimensions = dimensions;

this.output = output;

this.context = context;

this.gpu = gpu;

this.kernel = null;

this.type = type;

}

/**

* @desc Converts the Texture into a JavaScript Array.

* @param {GPU} [gpu]

* @returns {Number[]|Number[][]|Number[][][]}

*/

toArray(gpu) {

let {

kernel

} = this;

if (kernel) return kernel(this);

gpu = gpu || this.gpu;

if (!gpu) throw new Error('settings property "gpu" or argument required.');

kernel = gpu.createKernel(function(x) {

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

}, {

output: this.output,

precision: this.getPrecision(),

optimizeFloatMemory: this.type === 'MemoryOptimizedNumberTexture',

});

this.kernel = kernel;

return kernel(this);

}

getPrecision() {

switch (this.type) {

case 'NumberTexture':

return 'unsigned';

case 'MemoryOptimizedNumberTexture':

case 'ArrayTexture(1)':

case 'ArrayTexture(2)':

case 'ArrayTexture(3)':

case 'ArrayTexture(4)':

return 'single';

default:

throw new Error('Unknown texture type');

}

}

/**

* @desc Deletes the Texture

*/

delete() {

return this.context.deleteTexture(this.texture);

}

}

module.exports = {

Texture

};