WebGLShader

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

* Some parts of this feature may have varying levels of support.

WebGL APIWebGLShader 可以是一个顶点着色器(vertex shader)或片元着色器(fragment shader)。每个 WebGLProgram 都需要这两种类型的着色器。

描述

要创建一个 WebGLShader 需要使用 WebGLRenderingContext.createShader,通过 WebGLRenderingContext.shaderSource() 然后挂接 GLSL 源代码 , 最后调用 WebGLRenderingContext.compileShader() 完成着色器(shader)的编译。此时 WebGLShader 仍不是可用的形式,他需要被添加到一个 WebGLProgram里。

js
function createShader(gl, sourceCode, type) {
  // Compiles either a shader of type gl.VERTEX_SHADER or gl.FRAGMENT_SHADER
  var shader = gl.createShader(type);
  gl.shaderSource(shader, sourceCode);
  gl.compileShader(shader);

  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    var info = gl.getShaderInfoLog(shader);
    throw "Could not compile WebGL program. \n\n" + info;
  }
  return shader;
}

参看 WebGLProgram 关于添加着色器的信息。

范例

创建一个顶点着色器(vertex shader)

注意,有很多其他方式编译和访问着色器(shader)源代码字符串。这些示例仅用于例证说明。

js
var vertexShaderSource =
  "attribute vec4 position;\n" +
  "void main() {\n" +
  "  gl_Position = position;\n" +
  "}\n";

//从上面例子使用 createShader 函数。
var vertexShader = createShader(gl, vertexShaderSource, gl.VERTEX_SHADER);

创建一个片元着色器(fragment shader)

js
var fragmentShaderSource =
  "void main() {\n" + "  gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);\n" + "}\n";

//从上面例子使用 createShader 函数。
var fragmentShader = createShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER);

规范

Specification
WebGL Specification
# 5.8

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
WebGLShader
Available in workers
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

参阅