baseFilterShader()

vec4 getColor

Output the final color for the current pixel. It takes in two parameters: FilterInputs inputs, and in sampler2D canvasContent, and must return a color as a vec4.

FilterInputs inputs is a scruct with the following properties:

• vec2 texCoord, the position on the canvas, with coordinates between 0 and 1. Calling getTexture(canvasContent, texCoord) returns the original color of the current pixel.
• vec2 canvasSize, the width and height of the sketch.
• vec2 texelSize, the size of one real pixel relative to the size of the whole canvas. This is equivalent to 1 / (canvasSize * pixelDensity).

in sampler2D canvasContent is a texture with the contents of the sketch, pre-filter. Call getTexture(canvasContent, someCoordinate) to retrieve the color of the sketch at that coordinate, with coordinate values between 0 and 1.