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webgl-animation-not-frame-rate-independent.html
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<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
<head>
<metacharset="utf-8">
<metaname="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>WebGL - Animation, Not Frame Rate Independent</title>
<linktype="text/css" href="resources/webgl-tutorials.css" rel="stylesheet" />
</head>
<body>
<divclass="description">
don't do this!
</div>
<canvasid="canvas"></canvas>
</body>
<!-- vertex shader -->
<scriptid="vertex-shader-3d" type="x-shader/x-vertex">
attributevec4a_position;
attributevec4a_color;
uniformmat4u_matrix;
varyingvec4v_color;
voidmain(){
// Multiply the position by the matrix.
gl_Position=u_matrix*a_position;
// Pass the color to the fragment shader.
v_color=a_color;
}
</script>
<!-- fragment shader -->
<scriptid="fragment-shader-3d" type="x-shader/x-fragment">
precisionmediumpfloat;
// Passed in from the vertex shader.
varyingvec4v_color;
voidmain(){
gl_FragColor=v_color;
}
</script>
<!--
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://webglfundamentals.org/webgl/lessons/webgl-boilerplate.html
and https://webglfundamentals.org/webgl/lessons/webgl-resizing-the-canvas.html
for webgl-utils, m3, m4, and webgl-lessons-ui.
-->
<scriptsrc="resources/webgl-utils.js"></script>
<scriptsrc="resources/m4.js"></script>
<script>
"use strict";
functionmain(){
// Get A WebGL context
/** @type {HTMLCanvasElement} */
varcanvas=document.querySelector("#canvas");
vargl=canvas.getContext("webgl");
if(!gl){
return;
}
// setup GLSL program
varprogram=webglUtils.createProgramFromScripts(gl,["vertex-shader-3d","fragment-shader-3d"]);
// look up where the vertex data needs to go.
varpositionLocation=gl.getAttribLocation(program,"a_position");
varcolorLocation=gl.getAttribLocation(program,"a_color");
// lookup uniforms
varmatrixLocation=gl.getUniformLocation(program,"u_matrix");
// Create a buffer to put positions in
varpositionBuffer=gl.createBuffer();
// Bind it to ARRAY_BUFFER (think of it as ARRAY_BUFFER = positionBuffer)
gl.bindBuffer(gl.ARRAY_BUFFER,positionBuffer);
// Put geometry data into buffer
setGeometry(gl);
// Create a buffer to put colors in
varcolorBuffer=gl.createBuffer();
// Bind it to ARRAY_BUFFER (think of it as ARRAY_BUFFER = colorBuffer)
gl.bindBuffer(gl.ARRAY_BUFFER,colorBuffer);
// Put geometry data into buffer
setColors(gl);
functionradToDeg(r){
returnr*180/Math.PI;
}
functiondegToRad(d){
returnd*Math.PI/180;
}
vartranslation=[0,0,-360];
varrotation=[degToRad(190),degToRad(40),degToRad(320)];
varscale=[1,1,1];
varfieldOfViewRadians=degToRad(60);
varrotationSpeed=1.2;
drawScene();
// Draw the scene.
functiondrawScene(){
// Every frame increase the rotation a little.
rotation[1]+=rotationSpeed/60.0;// don't do this
webglUtils.resizeCanvasToDisplaySize(gl.canvas);
// Tell WebGL how to convert from clip space to pixels
gl.viewport(0,0,gl.canvas.width,gl.canvas.height);
// Clear the canvas AND the depth buffer.
gl.clear(gl.COLOR_BUFFER_BIT|gl.DEPTH_BUFFER_BIT);
// Turn on culling. By default backfacing triangles
// will be culled.
gl.enable(gl.CULL_FACE);
// Enable the depth buffer
gl.enable(gl.DEPTH_TEST);
// Tell it to use our program (pair of shaders)
gl.useProgram(program);
// Turn on the position attribute
gl.enableVertexAttribArray(positionLocation);
// Bind the position buffer.
gl.bindBuffer(gl.ARRAY_BUFFER,positionBuffer);
// Tell the position attribute how to get data out of positionBuffer (ARRAY_BUFFER)
varsize=3;// 3 components per iteration
vartype=gl.FLOAT;// the data is 32bit floats
varnormalize=false;// don't normalize the data
varstride=0;// 0 = move forward size * sizeof(type) each iteration to get the next position
varoffset=0;// start at the beginning of the buffer
gl.vertexAttribPointer(
positionLocation,size,type,normalize,stride,offset);
// Turn on the color attribute
gl.enableVertexAttribArray(colorLocation);
// Bind the color buffer.
gl.bindBuffer(gl.ARRAY_BUFFER,colorBuffer);
// Tell the attribute how to get data out of colorBuffer (ARRAY_BUFFER)
varsize=3;// 3 components per iteration
vartype=gl.UNSIGNED_BYTE;// the data is 8bit unsigned values
varnormalize=true;// normalize the data (convert from 0-255 to 0-1)
varstride=0;// 0 = move forward size * sizeof(type) each iteration to get the next position
varoffset=0;// start at the beginning of the buffer
gl.vertexAttribPointer(
colorLocation,size,type,normalize,stride,offset);
// Compute the matrices
varaspect=gl.canvas.clientWidth/gl.canvas.clientHeight;
varmatrix=m4.perspective(fieldOfViewRadians,aspect,1,2000);
matrix=m4.translate(matrix,translation[0],translation[1],translation[2]);
matrix=m4.xRotate(matrix,rotation[0]);
matrix=m4.yRotate(matrix,rotation[1]);
matrix=m4.zRotate(matrix,rotation[2]);
matrix=m4.scale(matrix,scale[0],scale[1],scale[2]);
// Set the matrix.
gl.uniformMatrix4fv(matrixLocation,false,matrix);
// Draw the geometry.
varprimitiveType=gl.TRIANGLES;
varoffset=0;
varcount=16*6;
gl.drawArrays(primitiveType,offset,count);
// Call drawScene again next frame
requestAnimationFrame(drawScene);
}
}
// Fill the buffer with the values that define a letter 'F'.
functionsetGeometry(gl){
gl.bufferData(
gl.ARRAY_BUFFER,
newFloat32Array([
// left column front
0,0,0,
0,150,0,
30,0,0,
0,150,0,
30,150,0,
30,0,0,
// top rung front
30,0,0,
30,30,0,
100,0,0,
30,30,0,
100,30,0,
100,0,0,
// middle rung front
30,60,0,
30,90,0,
67,60,0,
30,90,0,
67,90,0,
67,60,0,
// left column back
0,0,30,
30,0,30,
0,150,30,
0,150,30,
30,0,30,
30,150,30,
// top rung back
30,0,30,
100,0,30,
30,30,30,
30,30,30,
100,0,30,
100,30,30,
// middle rung back
30,60,30,
67,60,30,
30,90,30,
30,90,30,
67,60,30,
67,90,30,
// top
0,0,0,
100,0,0,
100,0,30,
0,0,0,
100,0,30,
0,0,30,
// top rung right
100,0,0,
100,30,0,
100,30,30,
100,0,0,
100,30,30,
100,0,30,
// under top rung
30,30,0,
30,30,30,
100,30,30,
30,30,0,
100,30,30,
100,30,0,
// between top rung and middle
30,30,0,
30,60,30,
30,30,30,
30,30,0,
30,60,0,
30,60,30,
// top of middle rung
30,60,0,
67,60,30,
30,60,30,
30,60,0,
67,60,0,
67,60,30,
// right of middle rung
67,60,0,
67,90,30,
67,60,30,
67,60,0,
67,90,0,
67,90,30,
// bottom of middle rung.
30,90,0,
30,90,30,
67,90,30,
30,90,0,
67,90,30,
67,90,0,
// right of bottom
30,90,0,
30,150,30,
30,90,30,
30,90,0,
30,150,0,
30,150,30,
// bottom
0,150,0,
0,150,30,
30,150,30,
0,150,0,
30,150,30,
30,150,0,
// left side
0,0,0,
0,0,30,
0,150,30,
0,0,0,
0,150,30,
0,150,0]),
gl.STATIC_DRAW);
}
// Fill the buffer with colors for the 'F'.
functionsetColors(gl){
gl.bufferData(
gl.ARRAY_BUFFER,
newUint8Array([
// left column front
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
// top rung front
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
// middle rung front
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
200,70,120,
// left column back
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
// top rung back
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
// middle rung back
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
80,70,200,
// top
70,200,210,
70,200,210,
70,200,210,
70,200,210,
70,200,210,
70,200,210,
// top rung right
200,200,70,
200,200,70,
200,200,70,
200,200,70,
200,200,70,
200,200,70,
// under top rung
210,100,70,
210,100,70,
210,100,70,
210,100,70,
210,100,70,
210,100,70,
// between top rung and middle
210,160,70,
210,160,70,
210,160,70,
210,160,70,
210,160,70,
210,160,70,
// top of middle rung
70,180,210,
70,180,210,
70,180,210,
70,180,210,
70,180,210,
70,180,210,
// right of middle rung
100,70,210,
100,70,210,
100,70,210,
100,70,210,
100,70,210,
100,70,210,
// bottom of middle rung.
76,210,100,
76,210,100,
76,210,100,
76,210,100,
76,210,100,
76,210,100,
// right of bottom
140,210,80,
140,210,80,
140,210,80,
140,210,80,
140,210,80,
140,210,80,
// bottom
90,130,110,
90,130,110,
90,130,110,
90,130,110,
90,130,110,
90,130,110,
// left side
160,160,220,
160,160,220,
160,160,220,
160,160,220,
160,160,220,
160,160,220]),
gl.STATIC_DRAW);
}
main();
</script>
</html>
