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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import Logger from '@/common/logger/Logger';
import {Tracklet} from '@/common/tracker/Tracker';
import invariant from 'invariant';
import {CanvasForm} from 'pts';
import {AbstractEffect, EffectFrameContext, EffectInit} from './Effect';
export default abstract class BaseGLEffect extends AbstractEffect {
protected _canvas: OffscreenCanvas | null = null;
protected _gl: WebGL2RenderingContext | null = null;
protected _program: WebGLProgram | null = null;
protected _frameTextureUnit: number = 0;
protected _frameTexture: WebGLTexture | null = null;
protected vertexShaderSource: string = '';
protected fragmentShaderSource: string = '';
protected _vertexShader: WebGLShader | null = null;
protected _fragmentShader: WebGLShader | null = null;
async setup(init: EffectInit): Promise<void> {
const {canvas, gl} = init;
if (canvas != null && gl != null) {
this._canvas = canvas;
this._gl = gl;
}
invariant(this._gl !== null, 'WebGL2 context is required');
const program = this._gl.createProgram();
this._program = program;
{
const vertexShader = this._gl.createShader(this._gl.VERTEX_SHADER);
this._vertexShader = vertexShader;
invariant(vertexShader !== null, 'vertexShader required');
this._gl.shaderSource(vertexShader, this.vertexShaderSource);
this._gl.compileShader(vertexShader);
invariant(program !== null, 'program required');
this._gl.attachShader(program, vertexShader);
const fragmentShader = this._gl.createShader(this._gl.FRAGMENT_SHADER);
this._fragmentShader = fragmentShader;
invariant(fragmentShader !== null, 'fragmentShader required');
this._gl.shaderSource(fragmentShader, this.fragmentShaderSource);
this._gl.compileShader(fragmentShader);
this._gl.attachShader(program, fragmentShader);
this._gl.linkProgram(program);
if (!this._gl.getProgramParameter(program, this._gl.LINK_STATUS)) {
Logger.error(this._gl.getShaderInfoLog(vertexShader));
Logger.error(this._gl.getShaderInfoLog(fragmentShader));
}
}
this._gl.useProgram(program);
this.setupBuffers(this._gl);
this.setupUniforms(this._gl, program, init);
}
apply(form: CanvasForm, context: EffectFrameContext, _tracklets: Tracklet[]) {
const gl = this._gl;
invariant(gl !== null, 'WebGL2 context is required');
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.activeTexture(gl.TEXTURE0 + this._frameTextureUnit);
gl.bindTexture(gl.TEXTURE_2D, this._frameTexture);
gl.texImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
context.frame.width,
context.frame.height,
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
context.frame,
);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
// Apply shader
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
const ctx = form.ctx;
invariant(this._canvas !== null, 'canvas is required');
ctx.drawImage(this._canvas, 0, 0);
}
async cleanup(): Promise<void> {
if (this._gl != null) {
// Dispose of WebGL resources, e.g., textures, buffers, etc.
if (this._frameTexture != null) {
this._gl.deleteTexture(this._frameTexture);
this._frameTexture = null;
}
if (
this._program != null &&
this._vertexShader != null &&
this._fragmentShader != null
) {
this._gl.detachShader(this._program, this._vertexShader);
this._gl.deleteShader(this._vertexShader);
this._gl.detachShader(this._program, this._fragmentShader);
this._gl.deleteShader(this._fragmentShader);
}
}
}
protected setupBuffers(gl: WebGL2RenderingContext) {
const vertexBufferData = new Float32Array([
1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0,
]);
const texCoordBufferData = new Float32Array([
1.0, 1.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0,
]);
const vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertexBufferData, gl.STATIC_DRAW);
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(0);
const texCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, texCoordBufferData, gl.STATIC_DRAW);
gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(1);
}
protected setupUniforms(
gl: WebGL2RenderingContext,
program: WebGLProgram,
init: EffectInit,
) {
this._frameTexture = gl.createTexture();
gl.uniform1i(
gl.getUniformLocation(program, 'uSampler'),
this._frameTextureUnit,
);
gl.uniform2f(
gl.getUniformLocation(program, 'uSize'),
init.width,
init.height,
);
}
}
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