vite2 ts 搭建webgl開發環境

原文鏈接: vite2 ts 搭建webgl開發環境

 

https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Tutorial/Using_shaders_to_apply_color_in_WebGL

 

需要引入一個庫

    <script src="https://cdnjs.cloudflare.com/ajax/libs/gl-matrix/2.8.1/gl-matrix-min.js"></script>

用gl畫一個彩色的方塊

 

安裝插件

yarn add rollup-plugin-glsl

import glsl from "rollup-plugin-glsl";


  glsl({
    // By default, everything gets included
    include: "**/*.glsl",
    // Undefined by default
    exclude: ["**/index.html"],
    // Source maps are on by default
    // sourceMap: false,
  }),


ts.config
  "include": [
    "src/**/*.ts",
    "src/**/*.d.ts",
    "src/**/*.tsx",
    "src/**/*.vue",
    "src/**/*.glsl"
  ]

 

添加聲明模塊

declare module "*.glsl";

兩個插件, 主要是語法高亮, 其實感覺上是可以直接用.c作爲後綴的... 這樣也就有了格式化能力

 

 

 

 

 

編寫glsl

vs

attribute vec4 aVertexPosition;
attribute vec4 aVertexColor;

uniform mat4 uModelViewMatrix;
uniform mat4 uProjectionMatrix;

varying lowp vec4 vColor;

void main(void) {
    gl_Position = uProjectionMatrix * uModelViewMatrix * aVertexPosition;
    vColor = aVertexColor;
}

fs

varying lowp vec4 vColor;

void main(void) {
    gl_FragColor = vColor;
}

vue

<template>
  <div class="flex-col justify-center align-item-center">
    <div>webgl</div>
    <canvas id="glCanvas" class="w-64 h-64" width="640" height="480"></canvas>
  </div>
</template>

<script lang="ts" setup>
import { onMounted } from "vue";
import vsSource from "./vs.glsl";
import fsSource from "./fs.glsl";
console.log("===");
console.error("test", vsSource, fsSource);
function loadShader(gl: WebGLRenderingContext, type: number, source: string) {
  const shader = gl.createShader(type)!;
  // Send the source to the shader object
  gl.shaderSource(shader, source);
  // Compile the shader program
  gl.compileShader(shader);
  // See if it compiled successfully
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    alert(
      "An error occurred compiling the shaders: " + gl.getShaderInfoLog(shader)
    );
    gl.deleteShader(shader);
    return null;
  }
  return shader;
}
function initShaderProgram(
  gl: WebGLRenderingContext,
  vsSource: string,
  fsSource: string
) {
  const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vsSource);
  const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fsSource);
  // Create the shader program
  const shaderProgram = gl.createProgram();
  if (!shaderProgram || !vertexShader || !fragmentShader) return;
  gl.attachShader(shaderProgram, vertexShader);
  gl.attachShader(shaderProgram, fragmentShader);
  gl.linkProgram(shaderProgram);
  // If creating the shader program failed, alert
  if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
    alert(
      "Unable to initialize the shader program: " +
        gl.getProgramInfoLog(shaderProgram)
    );
    return null;
  }
  return shaderProgram;
}

function initBuffers(gl) {
  // Create a buffer for the square's positions.

  const positionBuffer = gl.createBuffer();

  // Select the positionBuffer as the one to apply buffer
  // operations to from here out.

  gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);

  // Now create an array of positions for the square.

  const positions = [1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0];

  // Now pass the list of positions into WebGL to build the
  // shape. We do this by creating a Float32Array from the
  // JavaScript array, then use it to fill the current buffer.

  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);

  // Now set up the colors for the vertices

  var colors = [
    1.0,
    1.0,
    1.0,
    1.0, // white
    1.0,
    0.0,
    0.0,
    1.0, // red
    0.0,
    1.0,
    0.0,
    1.0, // green
    0.0,
    0.0,
    1.0,
    1.0, // blue
  ];

  const colorBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(colors), gl.STATIC_DRAW);

  return {
    position: positionBuffer,
    color: colorBuffer,
  };
}

const mat4: any = window.mat4;
function drawScene(gl: any, programInfo: any, buffers: any) {
  gl.clearColor(0.0, 0.0, 0.0, 1.0); // Clear to black, fully opaque
  gl.clearDepth(1.0); // Clear everything
  gl.enable(gl.DEPTH_TEST); // Enable depth testing
  gl.depthFunc(gl.LEQUAL); // Near things obscure far things

  // Clear the canvas before we start drawing on it.

  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

  // Create a perspective matrix, a special matrix that is
  // used to simulate the distortion of perspective in a camera.
  // Our field of view is 45 degrees, with a width/height
  // ratio that matches the display size of the canvas
  // and we only want to see objects between 0.1 units
  // and 100 units away from the camera.

  const fieldOfView = (45 * Math.PI) / 180; // in radians
  const aspect = gl.canvas.clientWidth / gl.canvas.clientHeight;
  const zNear = 0.1;
  const zFar = 100.0;
  const projectionMatrix = mat4.create();

  // note: glmatrix.js always has the first argument
  // as the destination to receive the result.
  mat4.perspective(projectionMatrix, fieldOfView, aspect, zNear, zFar);

  // Set the drawing position to the "identity" point, which is
  // the center of the scene.
  const modelViewMatrix = mat4.create();

  // Now move the drawing position a bit to where we want to
  // start drawing the square.

  mat4.translate(
    modelViewMatrix, // destination matrix
    modelViewMatrix, // matrix to translate
    [-0.0, 0.0, -6.0]
  ); // amount to translate

  // Tell WebGL how to pull out the positions from the position
  // buffer into the vertexPosition attribute
  {
    const numComponents = 2;
    const type = gl.FLOAT;
    const normalize = false;
    const stride = 0;
    const offset = 0;
    gl.bindBuffer(gl.ARRAY_BUFFER, buffers.position);
    gl.vertexAttribPointer(
      programInfo.attribLocations.vertexPosition,
      numComponents,
      type,
      normalize,
      stride,
      offset
    );
    gl.enableVertexAttribArray(programInfo.attribLocations.vertexPosition);
  }

  // Tell WebGL how to pull out the colors from the color buffer
  // into the vertexColor attribute.
  {
    const numComponents = 4;
    const type = gl.FLOAT;
    const normalize = false;
    const stride = 0;
    const offset = 0;
    gl.bindBuffer(gl.ARRAY_BUFFER, buffers.color);
    gl.vertexAttribPointer(
      programInfo.attribLocations.vertexColor,
      numComponents,
      type,
      normalize,
      stride,
      offset
    );
    gl.enableVertexAttribArray(programInfo.attribLocations.vertexColor);
  }

  // Tell WebGL to use our program when drawing

  gl.useProgram(programInfo.program);

  // Set the shader uniforms

  gl.uniformMatrix4fv(
    programInfo.uniformLocations.projectionMatrix,
    false,
    projectionMatrix
  );
  gl.uniformMatrix4fv(
    programInfo.uniformLocations.modelViewMatrix,
    false,
    modelViewMatrix
  );

  {
    const offset = 0;
    const vertexCount = 4;
    gl.drawArrays(gl.TRIANGLE_STRIP, offset, vertexCount);
  }
}
onMounted(() => {
  const canvas = document.querySelector<HTMLCanvasElement>("#glCanvas")!;
  const gl = canvas.getContext("webgl")!;
  gl.clearColor(0.0, 0.0, 0.0, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);
  const shaderProgram = initShaderProgram(gl, vsSource, fsSource);

  if (!shaderProgram) {
    console.error("shaderProgram is empty");
    return;
  }
  const programInfo = {
    program: shaderProgram,
    attribLocations: {
      vertexPosition: gl.getAttribLocation(shaderProgram, "aVertexPosition"),
      vertexColor: gl.getAttribLocation(shaderProgram, "aVertexColor"),
    },
    uniformLocations: {
      projectionMatrix: gl.getUniformLocation(
        shaderProgram,
        "uProjectionMatrix"
      ),
      modelViewMatrix: gl.getUniformLocation(shaderProgram, "uModelViewMatrix"),
    },
  };
  const buffers = initBuffers(gl);
  console.log("gl, programInfo, buffers", gl, programInfo, buffers);
  drawScene(gl, programInfo, buffers);
});
</script>

<style></style>