Simple interface to create glossy buttons. uses primitives and clip() to an image - no mesh code.

Glossy.lua

-- Glossy

-- Use this function to perform your initial setup
function setup()
    ellipseMode(CENTER)
    rectMode(CORNER)
    parameter.text("myText")
    parameter.number("bluroffset", -10,25,1.5)    
    parameter.integer("glossintensity", 1,24,8)
    parameter.integer("blursize", -10, 10, 0)
    parameter.integer("iter", 1, 10, 5)
    parameter.integer("iw", 1, 500, 120)
    parameter.integer("ih", 1, 250,40)
    parameter.integer("edge", 3,20,8)
    parameter.color("forecolor")
    parameter.color("highlight")
    parameter.integer("fontsize", 8,64, 12)
    forecolor = color(166, 124, 78, 255)
    highlight = color(166, 75, 173, 255)
    btncol = forecolor
    myText = "1"

end

-- This function gets called once every frame
function draw()
    -- This sets a dark background color 
    background(40, 40, 50)
        
    img = image(iw, ih)
    setContext (img)
    font("HelveticaNeue-Bold")
    fontSize(fontsize)
    clip(img.width, img.height)

    --draw base object
    fill(btncol)
    roundRect(0,0,iw,ih, edge)

        
    --create iterative brightening
    for x = 1,iter do
    strokeWidth(1)
    blendMode(ADDITIVE)
    stroke(0, 0, 0, 127)
    x = glossintensity
    fill(x,x,x, 255)
    ellipse(iw/2,ih,iw*1.5-(x*blursize),ih-bluroffset)
    end
    
    

    --blur under the text itself --unused!
--    blendMode(MULTIPLY)
--    stroke(255,255,255, 255)
--    fill(bl,bl,bl,254)
--    w,h=textSize(myText)
    --ellipse(40,20, w*1.5,h*1.5)
    
    --dropshadow text
    blendMode(NORMAL)
    textMode(CENTER)
    fill(46, 44, 44, 127)    
    text(myText, iw/2,ih/2+1)    
    --full-on text
    fill(255, 255, 255, 255)
    text(myText, iw/2,ih/2)
    
    setContext()
    clip()    
    --show it
    screenpos = vec2(WIDTH/2, HEIGHT/2)
    sprite(img, screenpos.x, screenpos.y)
    img=nil
end


function touched(touch)    
    if  touch.state == ENDED then 
        btncol = forecolor
    else
        btncol = highlight
    end
end


--borrowed to get the rounded rect!
function roundRect(x,y,w,h,r)
    pushStyle()
    insetPos = vec2(x + r,y + r)
    insetSize = vec2(w - 2 * r,h - 2 * r)

    blendMode(NORMAL) -- solved the balls and lines showing through!
    local red, green, blue, a = fill()
    stroke(red, green, blue, a)
    noSmooth()
    rectMode(CORNER)
    rect(insetPos.x, insetPos.y, insetSize.x, insetSize.y)

    if r > 0 then
        smooth()
        lineCapMode(ROUND)
        strokeWidth(r * 2)

        line(insetPos.x, insetPos.y, 
             insetPos.x + insetSize.x, insetPos.y)
        line(insetPos.x, insetPos.y,
             insetPos.x, insetPos.y + insetSize.y)
        line(insetPos.x, insetPos.y + insetSize.y,
             insetPos.x + insetSize.x, insetPos.y + insetSize.y)
        line(insetPos.x + insetSize.x, insetPos.y,
             insetPos.x + insetSize.x, insetPos.y + insetSize.y)            
    end
    popStyle()
end