@erfanhoseinih/webglutils v1.0.3

WebGL Utils

WebGL Utils a helper library for WebGL. this will save your time! and it keeps you away from repetitive operations like any other library.

The main goal is to help the evolution of webgl without adding something useless in the form of a few but useful functions.

How to use

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  program = gl.createProgramWebGL(vs,fs);
  ...
}

Documentation Table of Contents

WebGLRenderingContext

• main
• createWebGlContext
• createProgramWebGL
• createArrayBuffer
• impelementBuffers
• setFrameBuffer
• createFramebufferObject

• checkProgramLocation

main

main function just need to define it's will calling auto in webglutils!

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
}

createWebGlContext()

createWebGlContext() create webgl context

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
}

get parametr width and height

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext(300,200);
  ...
}

and get attribute webgl context

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext(300, 200, {alpha:true});
  ...
}

createProgramWebGL()

let vShader =`
attribute vec4 a_Position;
void main(){
  gl_Position = a_Position;
}
`;
let fShader =`
void main(){
  gl_FragColor = vec4(1.0);
}
`;

function main(){
  let canvas = document.getElementById("canvas");
  let gl = canvas.createWebGlContext();
  let program = gl.createProgramWebGL(vShader,fShader);

  gl.useProgram(program);
  ...
}

access to attribute and uniform locations in program object

let vShader =`
attribute vec4 a_Position;
void main(){
  gl_Position = a_Position;
}
`;
let fShader =`
uniform float u_alpha;
void main(){
  gl_FragColor = vec4(1.0);
}
`;

function main(){
  let canvas = document.getElementById("canvas");
  let gl = canvas.createWebGlContext();


  let program = gl.createProgramWebGL(vShader,fShader);

  program.getProgramLocations(); // finding program locations
 
  gl.useProgram(program);
  program.a_Position // attribute location value
  program.u_alpha // uniform location value
  ...
}

createArrayBuffer()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
  let positionBuffer = gl.createArrayBuffer(program.a_Position, vertices, 4, gl.FLOAT);
  let colorBuffer = gl.createArrayBuffer(program.a_Color, colors, 4, gl.FLOAT);
  ...
}

impelementBuffers()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
  let positionBuffer = gl.createArrayBuffer(program.a_Position, vertices, 4, gl.FLOAT);
  let colorBuffer = gl.createArrayBuffer(program.a_Color, colors, 4, gl.FLOAT);

  gl.impelementBuffers(positionBuffer);
  gl.impelementBuffers(colorBuffer);
  gl.drawArrays(gl.TRIANGLES, 0, positionBuffer.len)
  ...
}

setFrameBuffer()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
}

createFramebufferObject()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
}

background()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  ...
}

checkProgramLocation()

function main(){
  let canvas = document.getElementById("canvas");
  gl = canvas.createWebGlContext();
  program = gl.createProgramWebGL(vs,fs);
  let positionLoc = gl.getAttribLocation(program,"a_Position");
  gl.checkProgramLocation(positionLoc) throw an Error in console! 
  ...
}