TeaPot 用webgl画茶壶
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我想通过画一个茶壶，一步步的学习webgl。先画一个完全红的茶壶，在Fragment Shader里每一个像素都画成红的，这样画出来的物体没有立体感，但是我想尽快的现在屏幕上画出一些东西来。茶壶的数据是由网上找的半成品改的，放在TeaPotData.js里，是一个对象变量。
var teaPotData = {
vertexPositions : new Float32Array([......]),/*好多数据，三个一组，代表Mesh的vertex坐标*/
vertexNormals : new Float32Array([]),/*好多数据，三个一组，代表Mesh的vertex normal坐标*/
vertexTextureCoords :new Float32Array([]),/*好多数据，三个一组，代表Mesh的vertex texture坐标。*/
indices : new Uint16Array([])/*好多数据，代表Mesh的vertex的标号。三个一组就代表一个三角形*/
}
完整的数据在下面。
var teaPotData = { vertexPositions : new 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}
JS代码和html放在一个文件里
GPU画画分为三个部分
1.怎么画，比如没个像素画成哪个颜色。为GPU指定要执行的程序
2.画什么，要画的东西。存放在GPU上创建的buffer里。
3.GPU执行程序时怎么找到要画的东西。GPU的源文件里有两类变量，属性变量attribute和统一变量uniform，可以从buffer里得到值。这两类变量都有一个“位置”，这是它的唯一标号，在CPU可以得到这个标号，在告知GPU将这个标号与某一个buffer里的值以某个方法关联。有趣的是，属性变量的标号是整数，小于0代表错误，而统一变量的标号是一个JS对象，!统一变量 == true时代表错误。
<html>
<head>
<title>TeaPoltRed</title>
</head>
<body onload="main()">
<canvas id="viewPort" width="600" height="800">
This browser do not support webgl.
</canvas>
<script src="./examples/lib/cuon-matrix.js"></script><!-- 一个矩阵库，网上可以找到 -->
<script src="./TeaPotData.js"></script>
<script>
function main()
{
//get webgl context
var viewPort = document.getElementById("viewPort");
var gl = viewPort.getContext("webgl") || viewPort.getContext("experimental-webgl");
var VERTEX_SHADER =
"attribute vec4 a_Position;\n" +//创建一个属性变量
"uniform mat4 u_ModelMatrix;\n" +//MVP矩阵三个统一变量
"uniform mat4 u_ViewMatrix;\n" +
"uniform mat4 u_ProjMatrix;\n" +
"void main()\n" +
"{\n" +
" gl_Position = u_ProjMatrix*u_ViewMatrix*u_ModelMatrix*a_Position;\n" +
"}\n";
var FRAGMENT_SHADER =
"#ifdef GL_ES\n" +
"precision mediump float;\n" +
"#endif\n" +
"void main()\n" +
"{\n" +
" gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n" +//每一个像素都画成红色
"}\n";
var program = createProgram(gl, VERTEX_SHADER, FRAGMENT_SHADER);//准备好GPU可以执行的代码
if(!program)
{
return;
}
gl.useProgram(program);//指定GPU执行代码时，选择这个program对象，执行它里面编译链接好的代码。一个大型的程序可以有多个program对象，用来完成不同的效果
gl.program = program;//利用JS的特性给gl对象一个属性来存放当前program对象，只是为了方便写代码
var a_Position, u_ModelMatrix, u_ViewMatrix, u_ProjMatrix;//获得program对象里属性变量attribute和统一变量uniform的"位置“。
a_Position = gl.getAttribLocation(gl.program, "a_Position");
u_ModelMatrix = gl.getUniformLocation(gl.program, "u_ModelMatrix");
u_ViewMatrix = gl.getUniformLocation(gl.program, "u_ViewMatrix");
u_ProjMatrix = gl.getUniformLocation(gl.program, "u_ProjMatrix");
if(a_Position < 0 || !u_ModelMatrix || !u_ViewMatrix || !u_ProjMatrix)//判断是否正确的得到了位置，有趣的是，如果申明了一个变量，但是在shader里没有使用，编译链接后不会留下它。
{
alert("Failed to get store location from progrom");
return;
}
//创建一个buffer存放茶壶模型的vertexPositions
var teaPotPropertiesData = gl.createBuffer(); //创建一个buffer，类型是gl.ARRAY_BUFFER，代表将存放数组。
gl.bindBuffer(gl.ARRAY_BUFFER, teaPotPropertiesData);//选择这个buffer，对其操作。因为这一步不一定紧接着createBuffer，我可以先创建多个buffer，然后在选一个操作。所以需要这个函数。
gl.bufferData(gl.ARRAY_BUFFER, teaPotData.vertexPositions, gl.STATIC_DRAW);//给选择好的buffer赋值
var VFSIZE = teaPotData.vertexPositions.BYTES_PER_ELEMENTS;//获得每个元素几个字符
gl.vertexAttribPointer(a_Position, 3, gl.FLOAT, false, VFSIZE * 3, VFSIZE * 0 );//告诉GPU怎么用当前绑定的buffer，属性变量有三个元素，每一个是float类型，这个类型的大小是FSIZE个字符。 gl.enableVertexAttribArray(a_Position);//允许指定的属性变量用buffer //创建一个buffer存放茶壶模型的indices
teaPotPropertiesIndex = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, teaPotPropertiesIndex);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, teaPotData.indices, gl.STATIC_DRAW);
var nindex = teaPotData.indices.length;
var IFSIZE = teaPotData.indices.BYTES_PER_ELEMENT;//new Uint16Array(indices)
var modelMatrix = new Matrix4();
var viewMatrix = new Matrix4();
var projMatrix = new Matrix4();
viewMatrix.setLookAt(0.0, 0.0, 100.0, 0.0, 0.0, 0.0, 0, 1, 0);
projMatrix.setPerspective(30,viewPort.width/viewPort.height,1,100);
modelMatrix.setIdentity();
gl.uniformMatrix4fv(u_ModelMatrix, false, modelMatrix.elements);//给统一变量赋值
gl.uniformMatrix4fv(u_ViewMatrix, false, viewMatrix.elements);
gl.uniformMatrix4fv(u_ProjMatrix, false, projMatrix.elements);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT || gl.DEPTH_BUFFER_BIT);
gl.drawElements(gl.TRIANGLES, nindex, gl.UNSIGNED_SHORT, IFSIZE * 0);
}
function createProgram(gl, vShaderSource, fShaderSource)
{
var vShader = createShader(gl, gl.VERTEX_SHADER, vShaderSource);
var fShader = createShader(gl, gl.FRAGMENT_SHADER, fShaderSource);
if(!vShader || !fShader)
{
return null;
}
var program = gl.createProgram();
if(!program)
{
return null;
}
gl.attachShader(program, vShader);
gl.attachShader(program, fShader);
gl.linkProgram(program);
var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
if(!linked)
{
alert("Failed to link program " + gl.getProgramInfoLog(program));
gl.deleteProgram(program);
gl.deleteShader(fragmentShader);
gl.deleteShader(vertexShader);
return null;
}
return program;
}
function createShader(gl, type, source)
{
var shader = gl.createShader(type);
if(!shader)
{
alert("Failed to create "+ type + "shader");
return null;
}
gl.shaderSource(shader, source);
gl.compileShader(shader);
var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
if(!compiled)
{
alert("Failed to compile shader " + gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
return null;
}
return shader;
}
</script>
</body>
</html>