@itwin/core-frontend
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iTwin.js frontend components
111 lines • 4.28 kB
JavaScript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Bentley Systems, Incorporated. All rights reserved.
* See LICENSE.md in the project root for license terms and full copyright notice.
*--------------------------------------------------------------------------------------------*/
/** @packageDocumentation
* @module WebGL
*/
import { assert } from "@itwin/core-bentley";
import { GL } from "./GL";
import { System } from "./System";
function computeBytesUsed(width, height, format, numSamples) {
const bytesPerPixel = (GL.RenderBuffer.Format.DepthComponent16 === format ? 2 : 4);
return width * height * bytesPerPixel * numSamples;
}
/** @internal */
export class RenderBuffer {
_glBuffer;
_bytesUsed = 0;
_width;
_height;
get bytesUsed() { return this._bytesUsed; }
get width() { return this._width; }
get height() { return this._height; }
getHandle() { return this._glBuffer; }
static create(width, height, format = GL.RenderBuffer.Format.DepthComponent16) {
const gl = System.instance.context;
const glBuffer = gl.createRenderbuffer();
if (null === glBuffer) {
return undefined;
}
assert(0 < width && 0 < height);
RenderBuffer.bindBuffer(glBuffer);
gl.renderbufferStorage(GL.RenderBuffer.TARGET, format, width, height);
RenderBuffer.unbind();
return new RenderBuffer(glBuffer, width, height, computeBytesUsed(width, height, format, 1));
}
get isDisposed() { return this._glBuffer === undefined || this._glBuffer === null; }
[Symbol.dispose]() {
if (!this.isDisposed) {
System.instance.context.deleteRenderbuffer(this._glBuffer);
this._glBuffer = undefined;
this._bytesUsed = 0;
}
}
bind() {
assert(undefined !== this._glBuffer);
if (undefined !== this._glBuffer) {
RenderBuffer.bindBuffer(this._glBuffer);
}
}
constructor(glBuffer, width, height, bytesUsed) {
this._glBuffer = glBuffer;
this._bytesUsed = bytesUsed;
this._width = width;
this._height = height;
}
static bindBuffer(glBuffer) { System.instance.context.bindRenderbuffer(GL.RenderBuffer.TARGET, glBuffer); }
static unbind() { this.bindBuffer(null); }
}
/**
* A RenderBuffer for doing antialiasing (multisampling).
* @internal
*/
export class RenderBufferMultiSample {
_glBuffer;
_bytesUsed = 0;
_width;
_height;
_isDirty = false;
get bytesUsed() { return this._bytesUsed; }
get width() { return this._width; }
get height() { return this._height; }
get isDirty() { return this._isDirty; }
markBufferDirty(dirty) {
this._isDirty = dirty;
}
getHandle() { return this._glBuffer; }
static create(width, height, format, numSamples) {
const gl = System.instance.context;
const glBuffer = gl.createRenderbuffer();
if (null === glBuffer)
return undefined;
assert(0 < width && 0 < height);
RenderBufferMultiSample.bindBuffer(glBuffer);
gl.renderbufferStorageMultisample(GL.RenderBuffer.TARGET, numSamples, format, width, height);
RenderBufferMultiSample.unbind();
return new RenderBufferMultiSample(glBuffer, width, height, computeBytesUsed(width, height, format, numSamples));
}
get isDisposed() { return this._glBuffer === undefined || this._glBuffer === null; }
[Symbol.dispose]() {
if (!this.isDisposed) {
System.instance.context.deleteRenderbuffer(this._glBuffer);
this._glBuffer = undefined;
}
}
bind() {
assert(undefined !== this._glBuffer);
if (undefined !== this._glBuffer) {
RenderBufferMultiSample.bindBuffer(this._glBuffer);
}
}
constructor(glBuffer, width, height, bytesUsed) {
this._glBuffer = glBuffer;
this._bytesUsed = bytesUsed;
this._width = width;
this._height = height;
}
static bindBuffer(glBuffer) { System.instance.context.bindRenderbuffer(GL.RenderBuffer.TARGET, glBuffer); }
static unbind() { this.bindBuffer(null); }
}
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