@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
604 lines • 47.5 kB
JavaScript
import { TgdCameraPerspective } from "./../camera/index.js";
import { TgdConsole } from "./../debug/index.js";
import { TgdInputs } from "./../input/index.js";
import { TgdTime } from "./../time/index.js";
import { TgdEvent } from "../event/index.js";
import { TgdPainterGroup } from "../painter/group.js";
import { webglLookup } from "../utils/index.js";
import { TgdManagerAnimation } from "./animation/animation-manager.js";
import { Console } from "./console.js";
import { UniformBufferObjectsManager } from "./ubo-manager.js";
import { WebglParams } from "./webgl-params.js";
import { TgdExtensions } from "./extensions.js";
/**
* This class gives you a [WebGL2RenderingContext](https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext) for a given canvas,
* through its public readonly attribute `gl`.
*
* It also takes care of the canvas resizing and the animation frames.
*
* @example
* ```
* import { TgdContext, TgdPainterClear } from "@tgd"
*
* export function paint(canvas: HTMLCanvasElement) {
* const ctx = new TgdContext(canvas)
* const clear = new TgdPainterClear(ctx, { color: [1, 0.667, 0, 1] })
* ctx.add(clear)
* ctx.paint()
* }
* ```
*/
export class TgdContext extends TgdPainterGroup {
/**
* Ratio of the resolution in physical pixels to the resolution in CSS pixels
* for the current display device.
* @see https://developer.mozilla.org/en-US/docs/Web/API/Window/devicePixelRatio
*/
static get devicePixelRatio() {
return globalThis.devicePixelRatio ?? 1;
}
/**
* @param canvas The canvas to which attach a WebGL2 context.
* @see {@link TgdContextOptions}
*/
constructor(canvas, options = {}) {
super();
this.canvas = canvas;
this.options = options;
/**
* TGD will write error and warning messages to the console
* in case of problems and if `verbose` is set to `true`.
*/
this.verbose = true;
this.console = new Console(this);
this.eventResize = new TgdEvent();
/**
* Dispatched when everything has been painted.
*/
this.eventPaint = new TgdEvent();
/**
* Dispatched before anything is painted.
*/
this.eventPaintEnter = new TgdEvent();
/**
* Dispathed everytime we play or pause the main animation loop (`TgdContext.play()`, `TgdContext.pause()`).
*/
this.eventPlayingChange = new TgdEvent();
/**
* When the browser decides to destroy the context.
* @see https://wikis.khronos.org/webgl/HandlingContextLost
*/
this.eventWebGLContextLost = new TgdEvent();
/**
* At the point that setupWebGLStateAndResources is called the browser
* has reset all state to the default WebGL state and all previously
* allocated resources are invalid. So, you need to re-create textures,
* buffers, framebuffers, renderbuffers, shaders, programs,
* and setup your state (clearColor, blendFunc, depthFunc, etc...)
* @see https://wikis.khronos.org/webgl/HandlingContextLost
*/
this.eventWebGLContextRestored = new TgdEvent();
this.resolution = 1;
this.uniformBufferObjects = new UniformBufferObjectsManager();
this._gl = null;
/**
* If this function is set, it will be called once at the end of the next repaint.
* This is useful for snapshots.
*/
this.doSnapshot = null;
this._camera = new TgdCameraPerspective({
transfo: { distance: 10 },
far: 100,
near: 0.1,
fovy: Math.PI / 8,
zoom: 1,
});
this._width = 0;
this._height = 0;
this._fps = 0;
this._aspectRatio = 1;
this._aspectRatioInverse = 1;
this.paintingIsOngoing = false;
// We need to start another paiting after the current one is finished
this.paintingIsQueued = false;
this.isPlaying = false;
this.requestAnimationFrame = -1;
// Last time the context has been painted.
this.lastTimeInSec = -1;
this.animationManager = new TgdManagerAnimation(this);
// Used to store result of gl.readPixels() for one pixel.
this.readPixelColor = new Uint8Array(4);
this.oneTimePainters = new Set();
/**
* When you need a painter to be painted only one time.
*
* These painters will be painted before all the recurrent ones during next repaint.
* The main purpose of this function is to use it with framebuffers that will
* update textures that could be used in normal paintings.
*/
this.paintOneTime = (...painters) => {
for (const painter of painters) {
this.oneTimePainters.add(painter);
}
this.paint();
};
/**
* Trigger the painters to render the scene.
*/
this.paint = () => {
if (this.paintingIsOngoing) {
this.paintingIsQueued = true;
}
else {
this.paintingIsQueued = false;
this.paintingIsOngoing = true;
globalThis.cancelAnimationFrame(this.requestAnimationFrame);
this.requestAnimationFrame = globalThis.requestAnimationFrame(this.actualPaint);
}
};
this.actualPaint = (time) => {
const timeInSec = time * 1e-3;
if (this.lastTimeInSec < 0) {
this.lastTimeInSec = timeInSec;
this.paintingIsOngoing = false;
this.paintingIsQueued = false;
// First frame, let's skip it to get better timing.
this.paint();
return;
}
try {
const { gl } = this;
this.virtualTime.update(this);
this.setCurrentSize(gl.drawingBufferWidth, gl.drawingBufferHeight);
this.eventPaintEnter.dispatch(this);
const delayInSec = timeInSec - this.lastTimeInSec;
this._fps = Math.round(1 / delayInSec);
this.lastTimeInSec = timeInSec;
for (const oneTimePainter of this.oneTimePainters) {
oneTimePainter.paint(timeInSec, delayInSec);
}
this.oneTimePainters.clear();
super.paint(timeInSec, delayInSec);
if (this.animationManager.paint(timeInSec) || this.paintingIsQueued || this.isPlaying) {
this.paintingIsOngoing = false;
this.paint();
}
this.eventPaint.dispatch(this);
}
catch (error) {
this.console.error(error);
this.pause();
}
finally {
this.paintingIsOngoing = false;
this.doSnapshot?.();
}
};
this.createWebGLContext = () => {
const { canvas, options } = this;
const gl = canvas.getContext("webgl2", options);
if (!gl)
throw new Error("Unable to create a WebGL2 context!");
this._gl = gl;
gl.canvas.addEventListener("webglcontextlost", (evt) => {
// @see https://wikis.khronos.org/webgl/HandlingContextLost
evt.preventDefault();
this.console.error("[TgdContext] WebGL context has been lost!", evt instanceof WebGLContextEvent ? evt.statusMessage : evt);
this.pause();
super.delete();
this.eventWebGLContextLost.dispatch(this);
}, false);
gl.canvas.addEventListener("webglcontextrestored", () => {
this.console.info("[TgdContext] WebGL context has been restored.");
this.initialize?.(this);
this.eventWebGLContextRestored.dispatch(this);
}, false);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
this.resolution = options.resolution ?? 1;
if (this.resolution <= 0) {
this.resolution = TgdContext.devicePixelRatio ?? 1;
}
this.stateReset();
return gl;
};
this.verbose = options.verbose ?? true;
const gl = this.createWebGLContext();
this.extensions = new TgdExtensions(gl);
this.initialize = options.initialize;
canvas.addEventListener("webglcontextlost", (evt) => {
TgdConsole.debug({
text: "[TgdContext]",
color: "#fffe",
background: "#a00",
}, ` WebGL context has been lost! ${evt instanceof WebGLContextEvent ? evt.statusMessage : evt}`);
// @see https://wikis.khronos.org/webgl/HandlingContextLost
evt.preventDefault();
this.delete({ preserveContextLostEvents: true });
this.eventWebGLContextLost.dispatch(this);
}, false);
canvas.addEventListener("webglcontextrestored", () => {
TgdConsole.debug({
text: "[TgdContext]",
color: "#000e",
background: "#0f0",
}, " WebGL context has been restored");
const { initialize } = this;
if (initialize) {
this.createWebGLContext();
initialize(this);
}
this.eventWebGLContextRestored.dispatch(this);
}, false);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
this.resolution = options.resolution ?? 1;
if (this.resolution <= 0) {
this.resolution = TgdContext.devicePixelRatio ?? 1;
}
this.implementationColorReadFormat = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT);
this.implementationColorReadType = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_TYPE);
this._gl = gl;
this.observer = new ResizeObserver(() => {
const width = isOffscreen(canvas) ? canvas.width : canvas.clientWidth * this.resolution;
const height = isOffscreen(canvas) ? canvas.width : canvas.clientHeight * this.resolution;
const { onResize } = options;
if (onResize) {
if (!isOffscreen(canvas)) {
onResize(this, canvas.clientWidth, canvas.clientHeight);
}
}
else {
canvas.width = width;
canvas.height = height;
}
this.eventResize.dispatch({ width, height });
this.paint();
});
if (isOffscreen(canvas)) {
this.inputs = new TgdInputs();
}
else {
this.observer.observe(canvas);
this.inputs = new TgdInputs(canvas);
// Prevent system gestures.
canvas.style.touchAction = "none";
}
if (options.camera)
this._camera = options.camera;
this.name = options.name ?? `Context#${TgdContext.incrementalId++}`;
this.stateReset();
this.webglParams = new WebglParams(gl);
this.virtualTime = new TgdTime();
this.console.debug(`[TgdContext/${this.name}] New:`, options);
}
viewportExec(action, viewport) {
const { webglParams, camera } = this;
const savedWidth = this.width;
const savedHeight = this.height;
const savedViewport = webglParams.viewport;
const savedScissor = webglParams.scissor;
const savedScissorTest = webglParams.scissorTest;
const savedAspectRatio = this.width / this.height;
const savedAspectRatioInverse = 1 / savedAspectRatio;
const { x = 0, y = 0, width = savedWidth, height = savedHeight } = viewport;
this.width = width;
this.height = height;
this._aspectRatio = width / height;
this._aspectRatioInverse = 1 / this._aspectRatio;
webglParams.setViewport(x, y, width, height);
webglParams.scissorTest = true;
webglParams.scissor = [x, y, width, height];
if (camera) {
camera.screenWidth = width;
camera.screenHeight = height;
}
action();
if (camera) {
camera.screenWidth = savedWidth;
camera.screenHeight = savedHeight;
}
webglParams.scissorTest = savedScissorTest;
webglParams.scissor = savedScissor;
webglParams.viewport = savedViewport;
this._aspectRatio = savedAspectRatio;
this._aspectRatioInverse = savedAspectRatioInverse;
this.width = savedWidth;
this.height = savedHeight;
}
get gl() {
if (!this._gl) {
throw new Error(`[TgdContext] This context has been deleted: ${this.name}!`);
}
return this._gl;
}
get fps() {
return this._fps;
}
get time() {
return this.lastTimeInSec;
}
get camera() {
return this._camera;
}
set camera(camera) {
if (camera === this._camera)
return;
this._camera = camera;
camera.screenWidth = this.width;
camera.screenHeight = this.height;
}
/**
* Check if the last WebGL command has returned an error.
* If an error has been found, output `caption` to the console (if verbose is true)
* and execute `action()`.
* Do not use this function in a loop because it is slow.
* @returns `true` is an error has been detected.
*/
checkError(caption, action) {
const { gl } = this;
const error = gl.getError();
if (error !== gl.NO_ERROR && error !== gl.CONTEXT_LOST_WEBGL) {
this.console.error(`WebGL Error in ${caption}:`, webglLookup(error));
action?.();
return true;
}
return false;
}
animSchedule(...animations) {
const result = [];
let delay = 0;
for (const animation of animations) {
const duration = animation.duration + (animation.delay ?? 0);
animation.delay = delay + (animation.delay ?? 0);
delay += duration;
result.push(this.animationManager.schedule(animation));
}
this.paint();
return result;
}
animCancel(animation) {
this.animationManager.cancel(animation);
}
animCancelArray(animations) {
for (const animation of animations)
this.animationManager.cancel(animation);
}
animDebug(caption) {
this.animationManager.debug(caption);
}
get width() {
return this._width;
}
set width(width) {
this._width = width;
}
get height() {
return this._height;
}
set height(height) {
this._height = height;
}
get aspectRatio() {
return this._aspectRatio;
}
get aspectRatioInverse() {
return this._aspectRatioInverse;
}
set aspectRatio(aspectRatio) {
this._aspectRatio = aspectRatio;
this._aspectRatioInverse = 1 / aspectRatio;
}
/**
* Is the animation playing?
*/
get playing() {
return this.isPlaying;
}
/**
* If `playing` is true, the method `paint()` will be called
* for every animation frame.
* @see paint()
*/
set playing(value) {
if (value === this.isPlaying)
return;
if (!value) {
this.paintingIsOngoing = false;
this.paintingIsQueued = false;
globalThis.cancelAnimationFrame(this.requestAnimationFrame);
this.requestAnimationFrame = -1;
}
this.isPlaying = value;
this.eventPlayingChange.dispatch(value);
/**
* Even when pausing, we want to paint a last time.
* This will be helpful for TgdTime, for instance.
*/
this.paint();
}
/**
* Start the animation.
* You can achieve the same result with `context.playing = true`.
*
* @see playing
*/
play() {
this.playing = true;
}
/**
* Pause the animation.
* You can achieve the same result with `context.playing = false`.
*
* @see playing
*/
pause() {
this.playing = false;
}
takeSnapshot() {
const { canvas } = this;
const img = new Image();
return new Promise((resolve) => {
const blobToImage = (blob) => {
if (!blob) {
resolve(img);
return;
}
const url = URL.createObjectURL(blob);
img.src = url;
// eslint-disable-next-line unicorn/prefer-add-event-listener
img.onload = () => resolve(img);
};
this.doSnapshot = () => {
if (isOffscreen(canvas)) {
canvas
.convertToBlob()
.then(blobToImage)
.catch(() => resolve(img));
}
else {
canvas.toBlob(blobToImage);
}
};
});
}
lookupWebglConstant(value) {
const { gl } = this;
for (const key in gl) {
if (gl[key] === value)
return key;
}
return `Unknown gl[${value}]`;
}
/**
* Helper to test a context lost situation.
* @param restorationDelayInMilliseconds Time, in milliseconds, before the context is restored.
*/
loseContext(restorationDelayInMilliseconds = 1000) {
const ext = this.extensions.WEBGL_lose_context;
if (ext) {
ext.loseContext();
globalThis.setTimeout(() => {
ext.restoreContext();
}, restorationDelayInMilliseconds);
}
}
/**
* Most of the painters rely on the current viewport which is based on the canvas size.
* But if you want to paint in a framebuffer, you may want to use the texture widt/height
* instead.
*/
paintInCustomSize(width, height, paint) {
const { width: savedWidth, height: savedHeight } = this;
this.setCurrentSize(width, height);
paint();
this.setCurrentSize(savedWidth, savedHeight);
}
setCurrentSize(width, height) {
this.width = width;
this.height = height;
this.camera.screenWidth = this.width;
this.camera.screenHeight = this.height;
this.aspectRatio = this.width / this.height;
this.webglParams.setViewport(0, 0, this.width, this.height);
}
now() {
return Date.now() * 1e-3;
}
/**
* Read the color of a pixel as a Uint8Array of size 4.
*
* Don't forget to use `preserveDrawingBuffer: true` in the creation options
* of the WebGL context.
*
* @param xScreen From -1 (left) to +1 (right)
* @param yScreen From -1 (bottom) to +1 (top)
* @returns The color of a pixel
*/
readPixel(xScreen, yScreen) {
const { gl } = this;
const pixelX = Math.round(0.5 * (xScreen + 1) * gl.drawingBufferWidth);
const pixelY = Math.round(0.5 * (yScreen + 1) * gl.drawingBufferHeight);
gl.readPixels(pixelX, pixelY, 1, // width
1, // height
gl.RGBA, // format
gl.UNSIGNED_BYTE, // type
this.readPixelColor);
return this.readPixelColor;
}
delete({ preserveContextLostEvents = false, } = {}) {
this.eventPaint.removeAllListeners();
if (!preserveContextLostEvents) {
this.eventWebGLContextLost.removeAllListeners();
this.eventWebGLContextRestored.removeAllListeners();
}
this.inputs.keyboard.detach();
this.inputs.pointer.detach();
this.pause();
if (!isOffscreen(this.canvas)) {
this.observer.unobserve(this.canvas);
}
super.delete();
this._gl = null;
this.console.debug(`[TgdContext/${this.name}] Delete`);
}
stateReset() {
const { gl } = this;
const numberAttribs = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
const temporary = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, temporary);
for (let ii = 0; ii < numberAttribs; ++ii) {
gl.disableVertexAttribArray(ii);
gl.vertexAttribPointer(ii, 4, gl.FLOAT, false, 0, 0);
gl.vertexAttrib1f(ii, 0);
}
gl.deleteBuffer(temporary);
const numberTextureUnits = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS);
for (let ii = 0; ii < numberTextureUnits; ++ii) {
gl.activeTexture(gl.TEXTURE0 + ii);
gl.bindTexture(gl.TEXTURE_CUBE_MAP, null);
gl.bindTexture(gl.TEXTURE_2D, null);
}
gl.activeTexture(gl.TEXTURE0);
gl.useProgram(null);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindRenderbuffer(gl.RENDERBUFFER, null);
gl.disable(gl.BLEND);
gl.disable(gl.CULL_FACE);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.DITHER);
gl.disable(gl.SCISSOR_TEST);
gl.blendColor(0, 0, 0, 0);
gl.blendEquation(gl.FUNC_ADD);
gl.blendFunc(gl.ONE, gl.ZERO);
gl.clearColor(0, 0, 0, 0);
gl.clearDepth(1);
gl.clearStencil(-1);
gl.colorMask(true, true, true, true);
gl.cullFace(gl.BACK);
gl.depthFunc(gl.LESS);
gl.depthMask(true);
gl.depthRange(0, 1);
gl.frontFace(gl.CCW);
gl.hint(gl.GENERATE_MIPMAP_HINT, gl.DONT_CARE);
gl.lineWidth(1);
gl.pixelStorei(gl.PACK_ALIGNMENT, 4);
gl.pixelStorei(gl.UNPACK_ALIGNMENT, 4);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
gl.polygonOffset(0, 0);
gl.sampleCoverage(1, false);
gl.scissor(0, 0, gl.canvas.width, gl.canvas.height);
gl.stencilFunc(gl.ALWAYS, 0, 0xffffffff);
gl.stencilMask(0xffffffff);
gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
return gl;
}
}
TgdContext.incrementalId = 1;
function isOffscreen(canvas) {
return canvas instanceof OffscreenCanvas;
}
//# 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