javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Shadertoy Basic</title>
    <style>
    body {
        margin: 0;
    }
    #c {
        width: 100vw;
        height: 100vh;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs/r102/three.min.js"></script>
<script>
'use strict';

/* global THREE */

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas: canvas});
  renderer.autoClearColor = false;

  const camera = new THREE.OrthographicCamera(
    -1, // left
     1, // right
     1, // top
    -1, // bottom
    -1, // near,
     1, // far
  );
  const scene = new THREE.Scene();
  const plane = new THREE.PlaneBufferGeometry(2, 2);

  const fragmentShader = `
  #include <common>

  uniform vec3 iResolution;
  uniform float iTime;

  // By iq: https://www.shadertoy.com/user/iq  
  // license: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
  void mainImage( out vec4 fragColor, in vec2 fragCoord )
  {
      // Normalized pixel coordinates (from 0 to 1)
      vec2 uv = fragCoord/iResolution.xy;

      // Time varying pixel color
      vec3 col = 0.5 + 0.5*cos(iTime+uv.xyx+vec3(0,2,4));

      // Output to screen
      fragColor = vec4(col,1.0);
  }

  void main() {
    mainImage(gl_FragColor, gl_FragCoord.xy);
  }
  `;
  const uniforms = {
    iTime: { value: 0 },
    iResolution:  { value: new THREE.Vector3() },
  };
  const material = new THREE.ShaderMaterial({
    fragmentShader,
    uniforms,
  });
  scene.add(new THREE.Mesh(plane, material));

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;  // convert to seconds

    resizeRendererToDisplaySize(renderer);

    const canvas = renderer.domElement;
    uniforms.iResolution.value.set(canvas.width, canvas.height, 1);
    uniforms.iTime.value = time;

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>