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着色器特效
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parent
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commit
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438
src/core/fx/shader.ts
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438
src/core/fx/shader.ts
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import { Ticker } from 'mutate-animate';
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import { EmitableEvent, EventEmitter } from '../common/eventEmitter';
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import { loading } from '../loader/load';
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interface ShaderEvent extends EmitableEvent {}
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const isWebGLSupported = (() => {
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return !!document.createElement('canvas').getContext('webgl');
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})();
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type ShaderColorArray = [number, number, number, number];
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type ShaderEffectImage = Exclude<TexImageSource, VideoFrame | ImageData>;
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interface ProgramInfo {
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program: WebGLProgram;
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attrib: Record<string, number>;
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uniform: Record<string, WebGLUniformLocation>;
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}
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interface ShaderEffectBuffer {
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position: WebGLBuffer;
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texture: WebGLBuffer;
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indices: WebGLBuffer;
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}
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interface ShaderEffectShader {
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vertex: WebGLShader;
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fragment: WebGLShader;
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}
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interface MixedImage {
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canvas: HTMLCanvasElement;
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update(): void;
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}
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const builtinVs = `
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#ifdef GL_ES
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precision highp float;
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#endif
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attribute vec4 aVertexPosition;
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attribute vec2 aTextureCoord;
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varying highp vec2 vTextureCoord;
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`;
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const builtinFs = `
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#ifdef GL_ES
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precision highp float;
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#endif
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varying highp vec2 vTextureCoord;
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uniform sampler2D uSampler;
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`;
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export class ShaderEffect extends EventEmitter<ShaderEvent> {
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canvas: HTMLCanvasElement;
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gl: WebGLRenderingContext;
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program: WebGLProgram | null = null;
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texture: WebGLTexture | null = null;
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programInfo: ProgramInfo | null = null;
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buffer: ShaderEffectBuffer | null = null;
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shader: ShaderEffectShader | null = null;
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textureCanvas: MixedImage | null = null;
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private baseImages: ShaderEffectImage[] = [];
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private background: ShaderColorArray = [0, 0, 0, 0];
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private _vsSource: string = '';
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private _fsSource: string = '';
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get vsSource() {
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return builtinVs + this._vsSource;
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}
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get fsSource() {
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return builtinFs + this._fsSource;
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}
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constructor(background: ShaderColorArray) {
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super();
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this.canvas = document.createElement('canvas');
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if (!isWebGLSupported) {
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throw new Error(
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`Cannot initialize ShaderEffect, since your device does not support webgl.`
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);
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}
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this.gl = this.canvas.getContext('webgl')!;
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this.gl.clearColor(...background);
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this.gl.clear(this.gl.COLOR_BUFFER_BIT);
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this.background = background;
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const s = core.domStyle.scale * devicePixelRatio;
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this.canvas.width = s * core._PX_;
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this.canvas.height = s * core._PY_;
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}
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/**
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* 设置特效作用于的图片，不会修改原图片，而是会在 ShaderEffect.canvas 画布元素中展现
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* @param img 特效作用于的图片
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*/
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baseImage(...img: ShaderEffectImage[]) {
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this.baseImages = img;
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}
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/**
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* 强制重新渲染特效
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* @param compile 是否重新编译着色器脚本，并重新创建纹理
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*/
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update(compile: boolean = false) {
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const gl = this.gl;
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if (compile) {
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gl.deleteProgram(this.program);
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gl.deleteTexture(this.texture);
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gl.deleteBuffer(this.buffer?.position ?? null);
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gl.deleteBuffer(this.buffer?.texture ?? null);
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gl.deleteShader(this.shader?.vertex ?? null);
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gl.deleteShader(this.shader?.fragment ?? null);
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this.program = this.createProgram();
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this.programInfo = this.getProgramInfo();
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this.buffer = this.initBuffers();
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this.texture = this.createTexture();
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gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
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}
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this.textureCanvas?.update();
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this.drawScene();
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}
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/**
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* 设置顶点着色器，使用 glsl 编写，插件提供了一些新的 api
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* 着色器中必须包含 main 函数，同时为 gl_Position 赋值
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* @param shader 顶点着色器代码
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*/
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vs(shader: string) {
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this._vsSource = shader;
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}
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/**
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* 设置片元着色器，使用 glsl 编写，插件提供了一些新的 api
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* 着色器中必须包含 main 函数，同时为 gl_FragColor 赋值
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* @param shader 片元着色器代码
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*/
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fs(shader: string) {
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this._fsSource = shader;
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}
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/**
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* 绘制特效
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*/
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drawScene() {
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// 清空画布
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const gl = this.gl;
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gl.viewport(0, 0, this.canvas.width, this.canvas.height);
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gl.clearColor(...this.background);
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gl.clearDepth(1);
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gl.enable(gl.DEPTH_TEST);
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gl.depthFunc(gl.LEQUAL);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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// 设置顶点信息
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this.setPositionAttrib();
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this.setTextureAttrib();
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// 准备绘制
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.buffer!.indices);
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gl.useProgram(this.program);
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gl.activeTexture(gl.TEXTURE0);
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gl.bindTexture(gl.TEXTURE_2D, this.texture);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texImage2D(
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gl.TEXTURE_2D,
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0,
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gl.RGBA,
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gl.RGBA,
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gl.UNSIGNED_BYTE,
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this.textureCanvas!.canvas
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);
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gl.uniform1i(this.programInfo!.uniform.uSampler, 0);
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// 绘制
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gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
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}
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private createProgram() {
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const gl = this.gl;
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const vs = this.loadShader(gl.VERTEX_SHADER, this.vsSource);
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const fs = this.loadShader(gl.FRAGMENT_SHADER, this.fsSource);
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this.shader = {
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vertex: vs,
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fragment: fs
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};
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const program = gl.createProgram()!;
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gl.attachShader(program, vs);
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gl.attachShader(program, fs);
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gl.linkProgram(program);
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if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
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throw new Error(
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`Cannot initialize shader program. Error info: ${gl.getProgramInfoLog(
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program
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)}`
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);
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}
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return program;
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}
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private loadShader(type: number, source: string) {
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const gl = this.gl;
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const shader = gl.createShader(type)!;
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gl.shaderSource(shader, source);
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gl.compileShader(shader);
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if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
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throw new Error(
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`Cannot compile ${
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type === gl.VERTEX_SHADER ? 'vertex' : 'fragment'
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} shader. Error info: ${gl.getShaderInfoLog(shader)}`
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);
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}
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return shader;
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}
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private createTexture() {
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const gl = this.gl;
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const img = mixImage(this.baseImages);
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this.textureCanvas = img;
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const texture = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, texture);
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gl.texImage2D(
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gl.TEXTURE_2D,
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0,
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gl.RGBA,
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gl.RGBA,
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gl.UNSIGNED_BYTE,
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img.canvas
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);
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gl.generateMipmap(gl.TEXTURE_2D);
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return texture;
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}
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private initBuffers(): ShaderEffectBuffer {
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const positions = new Float32Array([1, 1, -1, 1, 1, -1, -1, -1]);
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const posBuffer = this.initBuffer(positions);
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const textureCoord = new Float32Array([1, 1, 0, 1, 1, 0, 0, 0]);
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const textureBuffer = this.initBuffer(textureCoord);
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return (this.buffer = {
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position: posBuffer,
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texture: textureBuffer,
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indices: this.initIndexBuffer()
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});
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}
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private initBuffer(pos: Float32Array) {
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const gl = this.gl;
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const posBuffer = gl.createBuffer()!;
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gl.bindBuffer(gl.ARRAY_BUFFER, posBuffer);
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gl.bufferData(gl.ARRAY_BUFFER, pos, gl.STATIC_DRAW);
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return posBuffer;
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}
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private initIndexBuffer() {
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const gl = this.gl;
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const buffer = gl.createBuffer()!;
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer);
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const indices = new Uint16Array([0, 1, 2, 2, 3, 1]);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
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return buffer;
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}
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private getProgramInfo(): ProgramInfo | null {
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if (!this.program) return null;
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const gl = this.gl;
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const pro = this.program;
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return (this.programInfo = {
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program: pro,
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attrib: {
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vertexPosition: gl.getAttribLocation(pro, 'aVertexPosition'),
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textureCoord: gl.getAttribLocation(pro, 'aTextureCoord')
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},
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uniform: {
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uSampler: gl.getUniformLocation(pro, 'uSampler')!
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}
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});
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}
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private setTextureAttrib() {
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const gl = this.gl;
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gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer!.texture);
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gl.vertexAttribPointer(
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this.programInfo!.attrib.textureCoord,
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2,
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gl.FLOAT,
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false,
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0,
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0
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);
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gl.enableVertexAttribArray(this.programInfo!.attrib.textureCoord);
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}
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private setPositionAttrib() {
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const gl = this.gl;
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gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer!.position);
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gl.vertexAttribPointer(
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this.programInfo!.attrib.vertexPosition,
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2,
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gl.FLOAT,
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false,
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0,
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0
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);
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gl.enableVertexAttribArray(this.programInfo!.attrib.vertexPosition);
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}
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static defaultVs: string = `
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void main() {
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vTextureCoord = aTextureCoord;
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gl_Position = aVertexPosition;
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}
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`;
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static defaultFs: string = `
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void main() {
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gl_FragColor = texture2D(uSampler, vTextureCoord);
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}
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`;
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}
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function floorPower2(value: number) {
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return Math.pow(2, Math.ceil(Math.log(value) / Math.LN2));
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}
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/**
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* 规范化 webgl 纹理图片，规范成2的幂的形式
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* @param img 要被规范化的图片
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*/
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function normalizeTexture(img: ShaderEffectImage) {
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const canvas = document.createElement('canvas');
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canvas.width = floorPower2(img.width);
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canvas.height = floorPower2(img.height);
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const ctx = canvas.getContext('2d')!;
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ctx.imageSmoothingEnabled = false;
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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return canvas;
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}
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function mixImage(imgs: ShaderEffectImage[]): MixedImage {
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// todo: 直接使用webgl纹理进行图片混合
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if (imgs.length === 0) {
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throw new Error(`Cannot mix images whose count is 0.`);
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}
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if (
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imgs.some(v => v.width !== imgs[0].width || v.height !== imgs[0].height)
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) {
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throw new Error(`Cannot mix images with different size.`);
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}
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const canvas = document.createElement('canvas');
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canvas.width = floorPower2(imgs[0].width);
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canvas.height = floorPower2(imgs[0].height);
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const ctx = canvas.getContext('2d')!;
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imgs.forEach(v => {
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const img = normalizeTexture(v);
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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});
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return {
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canvas,
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update() {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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imgs.forEach(v => {
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const img = normalizeTexture(v);
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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});
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}
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};
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}
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/**
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* 为一个着色器特效创建每帧更新的 ticker，部分条件下性能表现可能较差
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* @param effect 要每帧更新的着色器特效
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*/
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export function setTickerFor(effect: ShaderEffect) {
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const ticker = new Ticker();
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ticker.add(() => {
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effect.update();
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});
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return ticker;
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}
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export function replaceGameCanvas(effect: ShaderEffect, canvas: string[]) {
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let zIndex = 0;
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canvas.forEach(v => {
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const canvas = core.canvas[v].canvas;
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const z = parseInt(canvas.style.zIndex);
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if (z > zIndex) zIndex = z;
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canvas.style.display = 'none';
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});
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const gl = effect.canvas;
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gl.style.left = '0';
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gl.style.top = '0';
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gl.style.position = 'absolute';
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gl.style.zIndex = zIndex.toString();
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gl.style.display = 'block';
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gl.style.width = `${core._PX_ * core.domStyle.scale}px`;
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gl.style.height = `${core._PY_ * core.domStyle.scale}px`;
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core.dom.gameDraw.appendChild(gl);
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return {
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recover() {
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canvas.forEach(v => {
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const canvas = core.canvas[v].canvas;
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canvas.style.display = 'block';
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});
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gl.style.display = 'none';
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},
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append() {
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canvas.forEach(v => {
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const canvas = core.canvas[v].canvas;
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canvas.style.display = 'none';
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});
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gl.style.display = 'block';
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},
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remove() {
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this.recover();
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gl.remove();
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},
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update(compile?: boolean) {
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effect.update(compile);
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}
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};
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}
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