gl-texture-cube

gl-texture-cube

Wraps WebGL's cube texture object.

Note: This API is experimental and will probably change to reach parity with gl-texture2d.

Install

npm install gl-texture-cube

Example

Javascript

var Box3D = require('geo-3d-box')
var TextureCube = require('gl-texture-cube')

var boxData = Box3D({size: 2})

var box = Geometry(gl)
  .attr('aPosition', boxData.positions)
  .faces(boxData.cells)

var textures = generateCubemapTextures()

var cubemap = TextureCube(gl, textures)

program.uniforms.uTexture = cubemap.bind(0)
program.uniforms.uModel = model
program.uniforms.uView = view
program.uniforms.uProjection = projection

box.draw()

Vertex Shader

attribute vec3 aPosition;

uniform mat4 uModel;
uniform mat4 uView;
uniform mat4 uProjection;

varying vec3 vNorm;

void main() {
    gl_Position = uProjection * uView * uModel * vec4(aPosition, 1.0);
    vNorm = aPosition;
}

Fragment Shader

uniform samplerCube uTexture;

varying vec3 vNorm;

void main() {
    gl_FragColor = textureCube(uTexture, vNorm);
}

API

var createTextureCube = require('gl-texture-cube')

Constructor

var cubemap = createTextureCube(gl, domElements[, format=gl.RGBA, type=gl.UNSIGNED_BYTE])

Creates a texture from domElements, structured as:

{
  pos: {
    x: domElement,
    y: domElement,
    z: domElement,
  },
  neg: {
    x: domElement,
    y: domElement,
    z: domElement
  }
}

...where each domElement can be one of:

• An ImageData object
• An HTMLCanvas object
• An HTMLImage object
• An HTMLVideo object

Takes a WebGL context gl. Optionally takes a WebGL data format format and storage type type.

Methods

cubemap.bind([textureUnit])

Binds the texture. If the optional textureUnit is not defined then the active texture is not changed.

cubemap.dispose()

Destroys the texture and releases its resources.

cubemap.generateMipmap()

Generates mipmaps for the texture.

Properties

cubemap.wrap

Gets/sets the wrap behavior for the texture in both dimensions. Defaults to [gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE]. Example:

cubemap.wrap = [gl.REPEAT, gl.REPEAT]

cubemap.magFilter & cubemap.minFilter

Gets/sets the magnification and minification filter. Defaults to gl.NEAREST.

Credits

Based on gl-texture2d.