@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
334 lines • 26.5 kB
JavaScript
import { TgdCameraPerspective } from "./../camera/index.js";
import { TgdInputs } from "./../input/index.js";
import { TgdPainterGroup } from "../painter/group.js";
import { tgdCanvasCreate, webglLookup } from "../utils/index.js";
import { TgdManagerAnimation } from "./animation/animation-manager.js";
import { TgdEvent } from "../event/index.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 {
/**
* @param canvas The canvas to which attach a WebGL2 context.
* @see {@link TgdContextOptions}
*/
constructor(canvas, options = {}) {
var _a, _b;
super();
this.canvas = canvas;
this.options = options;
this.eventPaint = new TgdEvent();
this.resolution = 1;
this._camera = new TgdCameraPerspective({
transfo: { distance: 15 },
far: 100,
near: 0.1,
fovy: Math.PI / 8,
zoom: 1,
});
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;
// Difference between `Data.now()` and the time in `requestAnimationFrame()`.
this.timeShift = 0;
// Last time `pause()` was called.
this.pauseTime = 0;
// Number of seconds while we have been in pause.
this.pauseAccumulation = 0;
this.animationManager = new TgdManagerAnimation();
/**
* 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) => {
let 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 {
this.timeShift = timeInSec - this.now();
if (this.playing) {
// the pause is like a frozen time.
timeInSec -= this.pauseAccumulation;
}
const { gl } = this;
const delayInSec = timeInSec - this.lastTimeInSec;
this._fps = Math.round(1 / delayInSec);
this.lastTimeInSec = timeInSec;
this._camera.screenWidth = gl.drawingBufferWidth;
this._camera.screenHeight = gl.drawingBufferHeight;
this._aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
this._aspectRatioInverse = 1 / this._aspectRatio;
super.paint(timeInSec, delayInSec);
if (this.paintingIsQueued ||
this.animationManager.paint(timeInSec) ||
this.isPlaying) {
this.paintingIsOngoing = false;
this.paint();
}
this.eventPaint.dispatch(this);
}
catch (error) {
console.error(error);
}
finally {
this.paintingIsOngoing = false;
}
};
const gl = canvas.getContext("webgl2", options);
if (!gl)
throw new Error("Unable to create a WebGL2 context!");
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
this.resolution = (_a = options.resolution) !== null && _a !== void 0 ? _a : 1;
if (options.enableTextureFloatStorage) {
gl.getExtension("EXT_color_buffer_float");
}
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 = canvas.clientWidth * this.resolution;
const height = canvas.clientHeight * this.resolution;
const { onResize } = options;
if (onResize) {
onResize(this, canvas.clientWidth, canvas.clientHeight);
}
else {
canvas.width = width;
canvas.height = height;
}
gl.viewport(0, 0, canvas.width, canvas.height);
this.paint();
});
this.observer.observe(canvas);
this.inputs = new TgdInputs(canvas);
if (options.camera)
this._camera = options.camera;
this.name = (_b = options.name) !== null && _b !== void 0 ? _b : `Context#${TgdContext.incrementalId++}`;
// Prevent system gestures.
canvas.style.touchAction = "none";
this.stateReset();
}
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;
this.paint();
}
/**
* Check if the last WebGL command has returned an error.
*/
checkError(caption, action) {
const { gl } = this;
const error = gl.getError();
if (error !== gl.NO_ERROR) {
console.error(`WebGL Error in ${caption}:`, webglLookup(error));
action === null || action === void 0 ? void 0 : action();
}
}
animSchedule(...animations) {
var _a, _b;
const result = [];
let delay = 0;
for (const animation of animations) {
const duration = animation.duration + ((_a = animation.delay) !== null && _a !== void 0 ? _a : 0);
animation.delay = delay + ((_b = animation.delay) !== null && _b !== void 0 ? _b : 0);
delay += duration;
result.push(this.animationManager.schedule(animation));
}
this.paint();
return result;
}
animCancel(animation) {
this.animationManager.cancel(animation);
}
get width() {
return this.gl.drawingBufferWidth;
}
get height() {
return this.gl.drawingBufferHeight;
}
get aspectRatio() {
return this._aspectRatio;
}
get aspectRatioInverse() {
return this._aspectRatioInverse;
}
/**
* 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.paint();
else {
this.paintingIsOngoing = false;
this.paintingIsQueued = false;
globalThis.cancelAnimationFrame(this.requestAnimationFrame);
}
this.isPlaying = value;
}
/**
* Start the animation.
* You can achieve the same result with `context.playing = true`.
*
* @see playing
*/
play() {
this.playing = true;
if (this.pauseTime > 0) {
this.pauseAccumulation += this.time - this.pauseTime;
}
}
/**
* Pause the animation.
* You can achieve the same result with `context.playing = false`.
*
* @see playing
*/
pause() {
this.playing = false;
this.pauseTime = this.time;
}
takeSnapshotToCanvas(target) {
const context_ = target.getContext("2d");
if (!context_)
throw new Error("[TgdContext.takeSnapshot] We cannot get a 2D context for the target canvas! Maybe it already has another type of context.");
const { width, height } = target;
const canvas = tgdCanvasCreate(width, height);
const context = new TgdContext(canvas, this.options);
this.forEachChild(painter => context.add(painter));
context.actualPaint(this.lastTimeInSec * 1e3);
context.gl.finish();
context_.drawImage(canvas, 0, 0);
}
lookupWebglConstant(value) {
const { gl } = this;
for (const key in gl) {
if (gl[key] === value)
return key;
}
return `Unknown gl[${value}]`;
}
now() {
return Date.now() * 1e-3;
}
delete() {
this.pause();
this.observer.unobserve(this.canvas);
super.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;
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