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buffer-transform.js
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buffer-transform.js
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import {isWebGL2, Buffer, TransformFeedback} from '@luma.gl/webgl';
import {assert} from '../../utils';
export default class BufferTransform {
constructor(gl, props = {}) {
this.gl = gl;
this.currentIndex = 0;
this.feedbackMap = {};
this.varyings = null; // varyings array
this.bindings = []; // each element is an object : {sourceBuffers, feedbackBuffers, transformFeedback}
this.resources = {}; // resources to be deleted
this._initialize(props);
Object.seal(this);
}
setupResources(opts) {
for (const binding of this.bindings) {
this._setupTransformFeedback(binding, opts);
}
}
updateModelProps(props = {}) {
const {varyings} = this;
if (varyings.length > 0) {
props = Object.assign({}, props, {varyings});
}
return props;
}
getDrawOptions(opts = {}) {
const binding = this.bindings[this.currentIndex];
const {sourceBuffers, transformFeedback} = binding;
const attributes = Object.assign({}, sourceBuffers, opts.attributes);
return {attributes, transformFeedback};
}
swap() {
if (this.feedbackMap) {
this.currentIndex = this._getNextIndex();
return true;
}
return false;
}
// update source and/or feedbackBuffers
update(opts = {}) {
this._setupBuffers(opts);
}
// returns current feedbackBuffer of given name
getBuffer(varyingName) {
const {feedbackBuffers} = this.bindings[this.currentIndex];
const bufferOrParams = varyingName ? feedbackBuffers[varyingName] : null;
if (!bufferOrParams) {
return null;
}
return bufferOrParams instanceof Buffer ? bufferOrParams : bufferOrParams.buffer;
}
getData({varyingName} = {}) {
const buffer = this.getBuffer(varyingName);
if (buffer) {
return buffer.getData();
}
return null;
}
// Delete owned resources.
delete() {
for (const name in this.resources) {
this.resources[name].delete();
}
}
// Private
_initialize(props = {}) {
this._setupBuffers(props);
this.varyings = props.varyings || Object.keys(this.bindings[this.currentIndex].feedbackBuffers);
if (this.varyings.length > 0) {
// if writting to buffers make sure it is WebGL2
assert(isWebGL2(this.gl));
}
}
// auto create feedback buffers if requested
_getFeedbackBuffers(props) {
const {sourceBuffers} = props;
const feedbackBuffers = {};
if (this.bindings[this.currentIndex]) {
// this gurantees a partial feedback buffer set doesn't update
// previously set buffers during auto creation mode.
Object.assign(feedbackBuffers, this.bindings[this.currentIndex].feedbackBuffers);
}
if (this.feedbackMap) {
// feedbackMap is defined as sourceBuffer as key and feedbackBuffer name as object
for (const sourceName in this.feedbackMap) {
const feedbackName = this.feedbackMap[sourceName];
feedbackBuffers[feedbackName] = sourceName;
}
}
Object.assign(feedbackBuffers, props.feedbackBuffers);
for (const bufferName in feedbackBuffers) {
const bufferOrRef = feedbackBuffers[bufferName];
if (typeof bufferOrRef === 'string' && sourceBuffers[bufferOrRef]) {
// Create new buffer with same layout and settings as source buffer
const sourceBuffer = sourceBuffers[bufferOrRef];
const {byteLength, usage, accessor} = sourceBuffer;
feedbackBuffers[bufferName] = this._createNewBuffer(bufferName, {
byteLength,
usage,
accessor
});
}
}
return feedbackBuffers;
}
_setupBuffers(props = {}) {
const {sourceBuffers = null} = props;
Object.assign(this.feedbackMap, props.feedbackMap);
const feedbackBuffers = this._getFeedbackBuffers(props);
this._updateBindings({sourceBuffers, feedbackBuffers});
}
_setupTransformFeedback(binding, {model}) {
const {program} = model;
binding.transformFeedback = new TransformFeedback(this.gl, {
program,
buffers: binding.feedbackBuffers
});
}
_updateBindings(opts) {
this.bindings[this.currentIndex] = this._updateBinding(this.bindings[this.currentIndex], opts);
if (this.feedbackMap) {
const {sourceBuffers, feedbackBuffers} = this._swapBuffers(this.bindings[this.currentIndex]);
const nextIndex = this._getNextIndex();
this.bindings[nextIndex] = this._updateBinding(this.bindings[nextIndex], {
sourceBuffers,
feedbackBuffers
});
}
}
_updateBinding(binding, opts) {
if (!binding) {
return {
sourceBuffers: Object.assign({}, opts.sourceBuffers),
feedbackBuffers: Object.assign({}, opts.feedbackBuffers)
};
}
Object.assign(binding.sourceBuffers, opts.sourceBuffers);
Object.assign(binding.feedbackBuffers, opts.feedbackBuffers);
if (binding.transformFeedback) {
binding.transformFeedback.setBuffers(binding.feedbackBuffers);
}
return binding;
}
_swapBuffers(opts) {
if (!this.feedbackMap) {
return null;
}
const sourceBuffers = Object.assign({}, opts.sourceBuffers);
const feedbackBuffers = Object.assign({}, opts.feedbackBuffers);
for (const srcName in this.feedbackMap) {
const dstName = this.feedbackMap[srcName];
sourceBuffers[srcName] = opts.feedbackBuffers[dstName];
feedbackBuffers[dstName] = opts.sourceBuffers[srcName];
// make sure the new destination buffer is a Buffer object
assert(feedbackBuffers[dstName] instanceof Buffer);
}
return {sourceBuffers, feedbackBuffers};
}
// Create a buffer and add to list of buffers to be deleted.
_createNewBuffer(name, opts) {
const buffer = new Buffer(this.gl, opts);
if (this.resources[name]) {
this.resources[name].delete();
}
this.resources[name] = buffer;
return buffer;
}
_getNextIndex() {
return (this.currentIndex + 1) % 2;
}
}