Class GLShader

constructor

• new GLShader(gl, vertex, fragment, precision?): GLShader

• Parameters

  • gl: WebGLRenderingContext

    the current WebGL rendering context
  • vertex: string

    a string containing the GLSL source code to set
  • fragment: string

    a string containing the GLSL source code to set
  • Optionalprecision: string

    float precision ('lowp', 'mediump' or 'highp').

  Returns GLShader

  See

  https://developer.mozilla.org/en-US/docs/Games/Techniques/3D_on_the_web/GLSL_Shaders

  Example

  // create a basic shader
  let myShader = new me.GLShader(
     // WebGL rendering context
     gl,
     // vertex shader
     [
         "void main() {",
         "    gl_Position = doMathToMakeClipspaceCoordinates;",
         "}"
     ].join("\n"),
     // fragment shader
     [
         "void main() {",
         "    gl_FragColor = doMathToMakeAColor;",
         "}"
     ].join("\n")
   )
  // use the shader
  myShader.bind();
  Copy

attributes

fragment

gl

program

uniforms

vertex

bind

• bind(): void

• Installs this shader program as part of current rendering state

  Returns void

destroy

• destroy(): void

• destroy this shader objects resources (program, attributes, uniforms)

  Returns void

getAttribLocation

• getAttribLocation(name): number

• returns the location of an attribute variable in this shader program

  Parameters

  • name: string

    the name of the attribute variable whose location to get.

  Returns number

  number indicating the location of the variable name if found. Returns -1 otherwise

setUniform

• setUniform(name, value): void

• Set the uniform to the given value

  Parameters

  • name: string

    the uniform name
  • value: object | Float32Array

    the value to assign to that uniform

  Returns void

  Example

  myShader.setUniform("uProjectionMatrix", this.projectionMatrix);
  Copy

setVertexAttributes

• setVertexAttributes(gl, attributes, vertexByteSize): void

• activate the given vertex attribute for this shader

  Parameters

  • gl: WebGLRenderingContext

    the current WebGL rendering context
  • attributes: object[]

    an array of vertex attributes
  • vertexByteSize: number

    the size of a single vertex in bytes

  Returns void