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    WebGLShader

    The WebGLShader is part of the WebGL API and can either be a vertex or a fragment shader. A WebGLProgram requires both types of shaders.

    DescriptionEdit

    To create a WebGLShader use WebGLRenderingContext.createShader, then hook up the GLSL source code using WebGLRenderingContext.shaderSource(), and finally invoke WebGLRenderingContext.compileShader() to finish and compile the shader. At this point the WebGLShader is still not in a usable form and must still be attached to a WebGLProgram.

    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;
  }
}

    See WebGLProgram for information on attaching the shaders.

    ExamplesEdit

    Creating a vertex shader

    Note that there are many other strategies for writing and accessing shader source code strings. These example are for illustration purposes only.

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

//Use the createShader function from the example above
var vertexShader = createShader(gl, vertexShaderSource, gl.VERTEX_SHADER)

    Creating a fragment shader

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

//Use the createShader function from the example above
var fragmentShader = createShader(gl, fragmentShaderSource, gl.FRAGMENT_SHADER)

    SpecificationsEdit

    Specification Status Comment
    WebGL 1.0
    The definition of 'WebGLShader' in that specification.    		 Recommendation Initial definition.

    Browser compatibilityEdit

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 9 4.0 (2.0) 11 12 5.1
    Available in workers No support 44 (44) [1] No support No support No support

    [1] This feature is behind a feature preference setting. In about:config, set gfx.offscreencanvas.enabled to true.

    See alsoEdit

    Document Tags and Contributors

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     Contributors to this page: fscholz, TatumCreative
     Last updated by: fscholz,