WebGL2 - Generate Mipmap Speed Test

README.md

WebGL2 - Generate Mipmap Speed Test

view on jsgist

index.css

@import url("https://webgl2fundamentals.org/webgl/resources/webgl-tutorials.css");
body {
  margin: 0;
}
#ui {
  width: 100px;
  background-color: red;
  padding: 0.25em;
}
body, document {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
}
#uiContainer {
  left: 10px;
  top: 130px;
}
#info {
  position: absolute;
  left: 0;
  top: 0;
  background-color: black;
  color: white;
  margin: 0;
  padding: 0.5em;
}
canvas {
  width: initial;
  height: initial;
}

index.html

<canvas id="canvas"></canvas>
<pre id="info"></pre>
<!--
for most samples webgl-utils only provides shader compiling/linking and
canvas resizing because why clutter the examples with code that's the same in every sample.
See https://webgl2fundamentals.org/webgl/lessons/webgl-boilerplate.html
and https://webgl2fundamentals.org/webgl/lessons/webgl-resizing-the-canvas.html
for webgl-utils, m3, m4, and webgl-lessons-ui.
-->
<script src="https://webgl2fundamentals.org/webgl/resources/webgl-utils.js"></script>
<script src="https://webgl2fundamentals.org/webgl/resources/m4.js"></script>

index.js

// WebGL2 - Textures - Mips - Depth
// from https://webgl2fundamentals.org/webgl/webgl-3d-textures-mips-tri-linear.html

import GUI from 'https://webgpufundamentals.org/3rdparty/muigui-0.x.module.js';
import RollingAverage from 'https://webgpufundamentals.org/webgpu/resources/js/rolling-average.js';

"use strict";

const fpsAverage = new RollingAverage();

var vertexShaderSource = `#version 300 es

// an attribute is an input (in) to a vertex shader.
// It will receive data from a buffer
in vec4 a_position;
in vec2 a_texcoord;

// A matrix to transform the positions by
uniform mat4 u_matrix;

// a varying to pass the texture coordinates to the fragment shader
out vec2 v_texcoord;

// all shaders have a main function
void main() {
  // Multiply the position by the matrix.
  gl_Position = u_matrix * a_position;

  // Pass the texcoord to the fragment shader.
  v_texcoord = a_texcoord;
}
`;

var fragmentShaderSource = `#version 300 es

precision highp float;

// Passed in from the vertex shader.
in vec2 v_texcoord;

// The texture.
uniform sampler2D u_texture;

// we need to declare an output for the fragment shader
out vec4 outColor;

void main() {
  outColor = texture(u_texture, v_texcoord);
}
`;

const maxTextures = 250;
var zDepth = 50;

function main() {
  // Get A WebGL context
  /** @type {HTMLCanvasElement} */
  var canvas = document.querySelector("#canvas");
  var gl = canvas.getContext("webgl2", {antialias: false});
  if (!gl) {
    return;
  }
  const ext = gl.getExtension('WEBGL_debug_renderer_info');
  if (ext) {
    console.log(gl.getParameter(ext.UNMASKED_RENDERER_WEBGL));
    console.log(gl.getParameter(ext.UNMASKED_VENDOR_WEBGL));
  }

  // Use our boilerplate utils to compile the shaders and link into a program
  var program = webglUtils.createProgramFromSources(gl,
      [vertexShaderSource, fragmentShaderSource]);

  // look up where the vertex data needs to go.
  var positionAttributeLocation = gl.getAttribLocation(program, "a_position");
  var texcoordAttributeLocation = gl.getAttribLocation(program, "a_texcoord");

  // look up uniform locations
  var matrixLocation = gl.getUniformLocation(program, "u_matrix");

  // Create a buffer
  var positionBuffer = gl.createBuffer();

  // Create a vertex array object (attribute state)
  var vao = gl.createVertexArray();

  // and make it the one we're currently working with
  gl.bindVertexArray(vao);

  // Turn on the attribute
  gl.enableVertexAttribArray(positionAttributeLocation);

  // Bind it to ARRAY_BUFFER (think of it as ARRAY_BUFFER = positionBuffer)
  gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
  // Set Geometry.
  setGeometry(gl);

  // Tell the attribute how to get data out of positionBuffer (ARRAY_BUFFER)
  {
    const size = 3;          // 3 components per iteration
    const type = gl.FLOAT;   // the data is 32bit floats
    const normalize = false; // don't normalize the data
    const stride = 0;        // 0 = move forward size * sizeof(type) each iteration to get the next position
    const offset = 0;        // start at the beginning of the buffer
    gl.vertexAttribPointer(
        positionAttributeLocation, size, type, normalize, stride, offset);
  }

  // create the texcoord buffer, make it the current ARRAY_BUFFER
  // and copy in the texcoord values
  var texcoordBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, texcoordBuffer);
  setTexcoords(gl);

  // Turn on the attribute
  gl.enableVertexAttribArray(texcoordAttributeLocation);

  // Tell the attribute how to get data out of texcoordBuffer (ARRAY_BUFFER)
  {
    const size = 2;          // 2 components per iteration
    const type = gl.FLOAT;   // the data is 32bit floating point values
    const normalize = true;  // convert from 0-255 to 0.0-1.0
    const stride = 0;        // 0 = move forward size * sizeof(type) each iteration to get the next color
    const offset = 0;        // start at the beginning of the buffer
    gl.vertexAttribPointer(
        texcoordAttributeLocation, size, type, normalize, stride, offset);
  }

  const size = 2048;
  const half = size / 2;

  // Create a texture.
  const texture = gl.createTexture();

  // use texture unit 0
  gl.activeTexture(gl.TEXTURE0 + 0);

  // bind to the TEXTURE_2D bind point of texture unit 0
  gl.bindTexture(gl.TEXTURE_2D, texture);

  // Now that the image has loaded make copy it to the texture.
  gl.bindTexture(gl.TEXTURE_2D, texture);
  gl.texStorage2D(gl.TEXTURE_2D, Math.log2(size) + 1, gl.RGBA8, size, size);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_NEAREST);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

  const fb = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
  gl.bindFramebuffer(gl.FRAMEBUFFER, null);

  function degToRad(d) {
    return d * Math.PI / 180;
  }

  // First let's make some variables
  // to hold the translation,
  var fieldOfViewRadians = degToRad(60);

  let then = 0;
  const info = document.querySelector('#info');
  const params = {
    count: 1,
  };
  const gui = new GUI();
  gui.add(params, 'count', 1, 1000, 1);

  function render(time) {
    const deltaTime = time - then;
    then = time;
    fpsAverage.addSample(deltaTime);
    info.textContent = `fps: ${(1000 / fpsAverage.get()).toFixed(0)}`;

    gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);

    gl.clearColor(time / 1000 % 1, time / 1000 % 1.234, time / 1000 % 1.567, 1);
    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    // turn on depth testing
    gl.enable(gl.DEPTH_TEST);

    // tell webgl to cull faces
    gl.enable(gl.CULL_FACE);

    // Tell it to use our program (pair of shaders)
    gl.useProgram(program);

    // Bind the attribute/buffer set we want.
    gl.bindVertexArray(vao);

    for (let i = 0; i < params.count; ++i) {
      gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
      gl.clear(gl.COLOR_BUFFER_BIT);
      gl.bindFramebuffer(gl.FRAMEBUFFER, null);
      gl.bindTexture(gl.TEXTURE_2D, texture);
      gl.generateMipmap(gl.TEXTURE_2D);

      gl.bindTexture(gl.TEXTURE_2D, texture);

      // Draw the geometry.
      gl.drawArrays(gl.TRIANGLES, 0, 1 * 6);
    }

    requestAnimationFrame(render);
  }
  requestAnimationFrame(render);
}

// Fill the current ARRAY_BUFFER buffer
// with the values that define a plane.
function setGeometry(gl) {
  var positions = new Float32Array([
      -0.5, 0.5, -0.5,
       0.5, 0.5, -0.5,
      -0.5, 0.5,  0.5,
      -0.5, 0.5,  0.5,
       0.5, 0.5, -0.5,
       0.5, 0.5,  0.5,
  ]);

  gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
}

// Fill the current ARRAY_BUFFER buffer
// with texture coordinates for a plane
function setTexcoords(gl) {
  gl.bufferData(
      gl.ARRAY_BUFFER,
      new Float32Array([
          0, 0,
          1, 0,
          0, zDepth,
          0, zDepth,
          1, 0,
          1, zDepth,
      ]),
      gl.STATIC_DRAW);
}

main();


// This is needed if the images are not on the same domain
// NOTE: The server providing the images must give CORS permissions
// in order to be able to use the image with WebGL. Most sites
// do NOT give permission.
// See: http://webgl2fundamentals.org/webgl/lessons/webgl-cors-permission.html
function requestCORSIfNotSameOrigin(img, url) {
  if ((new URL(url, window.location.href)).origin !== window.location.origin) {
    img.crossOrigin = "";
  }
}

jsGist.json

{"name":"WebGL2 - Generate Mipmap Speed Test","settings":{},"filenames":["index.html","index.css","index.js"]}