preserveDrawingBuffer
preserveDrawingBuffer is a WebGL context attribute that can be set to true or false. When set to true, it causes the drawing buffer to be preserved after each frame is rendered. This means that the contents of the canvas will remain visible even after the `clear()` or `clearColor()` methods are called. This can be useful for applications that want to display a series of images or animations, as it allows you to draw on top of previous frames without having to re-render the entire scene each time.
By default, preserveDrawingBuffer is set to false. This means that the drawing buffer is cleared after each
To set preserveDrawingBuffer to true, you would use the following code:
const canvas = document.getElementById('myCanvas');
const gl = canvas.getContext('webgl', { preserveDrawingBuffer: true });
When preserveDrawingBuffer is true, you can then use methods like `getImageData()` to capture the current contents