gfx.js/README.md

WebGL wrappings for Graphics

## gfx.js

WebGL wrappings for graphics.

## Install

```bash
npm install gfx.js
```

## Usage

```javascript
  let gfx = window.gfx;

  // init
  let device = new gfx.Device(canvas);

  // init resources
  let program = new gfx.Program(device, {
    vert: `
      precision mediump float;
      attribute vec2 a_position;
      void main () {
        gl_Position = vec4(a_position, 0, 1);
      }
    `,
    frag: `
      precision mediump float;
      uniform vec4 color;
      void main () {
        gl_FragColor = color;
      }
    `,
  });
  program.link();

  let vertexFmt = new gfx.VertexFormat([
    { name: gfx.ATTR_POSITION, type: gfx.ATTR_TYPE_FLOAT32, num: 2 },
  ]);
  let vertexBuffer = new gfx.VertexBuffer(
    device,
    vertexFmt,
    gfx.USAGE_STATIC,
    new Float32Array([-1, 0, 0, -1, 1, 1]),
    3
  );

  // update
  function animate() {
    device.setViewport(0, 0, canvas.width, canvas.height);
    device.clear({
      color: [0.1, 0.1, 0.1, 1],
      depth: 1
    });
    device.setVertexBuffer(0, vertexBuffer);
    device.setUniform('color', new Float32Array([1, 0, 0, 1]));
    device.setProgram(program);
    device.draw(0, vertexBuffer._numVertices);

    requestAnimationFrame(animate);
  }

  requestAnimationFrame(animate);
});
```

## Documentation

TODO

## License

MIT © 2017 Johnny Wu