Create a material that can draw custom sprites using a 2d canvas.
parameters is an object that can be used to set up the default properties
color - the color of the sprite
program - the program used to draw the sprite
The color of the sprite. The material will set up the color for the context before calling the material's program.
context -- The canvas context
color -- The color of the sprite
Define a program that will use the context to draw the sprite.