Draw rounded shapes with ease. RNDX is a lightweight and efficient library designed to make drawing rounded shapes simple, fast, and visually stunning.

Using Shader Model 3.0, RNDX provides near-perfect anti-aliasing with no performance hit, allowing you to create beautiful interfaces and visuals with ease.

• Blazing Fast Performance: Optimized for speed, RNDX is incredibly lightweight and efficient. (It will get even faster once we get mat:SetFloat4()!)
• Perfect Anti-Aliasing: Enjoy smooth, pixel-perfect corners with no performance hit.
• Simple & Intuitive: No complex objects or states—just call a function and draw!
• Seamless Integration: Works flawlessly inside 3D2D and Panel:Paint* functions without any hacks.

1. Download rndx.lua from GitHub releases.
2. Add rndx.lua to your project.
3. Run include on rndx.lua. (It's already calls AddCSLuaFile for you!)
4. Voilà! You're ready to draw rounded shapes with ease. 🎉

local RNDX = include("rndx.lua")
hook.Add("HUDPaint", "RNDX Example", function()
    local flags = RNDX.NO_TL + RNDX.NO_TR + RNDX.SHAPE_IOS
    RNDX.Draw(10, 100, 100, 200, 200, nil, flags + RNDX.BLUR)
    RNDX.Draw(10, 100, 100, 200, 200, Color(255, 0, 0, 150), flags)
    RNDX.DrawOutlined(10, 100, 100, 200, 200, Color(0, 255, 0), 10, flags)
end)

• RNDX.NO_TL: Disables top-left corner.
• RNDX.NO_TR: Disables top-right corner.
• RNDX.NO_BL: Disables bottom-left corner.
• RNDX.NO_BR: Disables bottom-right corner.
• RNDX.BLUR: Use blur for the shape.
• RNDX.MANUAL_COLOR: Allows setting the color via surface.SetDrawColor.

• RNDX.SHAPE_CIRCLE
• RNDX.SHAPE_FIGMA <-- Default
• RNDX.SHAPE_IOS

Benchmarking has to be done with FPS meter, not checking how long cpu takes to draw.

local RNDX = include("rndx.lua")
local draw_RoundedBox = draw.RoundedBox
local col = Color(0, 0, 0, 255)
hook.Add("HUDPaint", "my_shader_draw", function()
	for i = 1, 3000 do
		RNDX.Draw(20, 20, 20, 200, 200, col)
		-- draw_RoundedBox(20, 20, 20, 200, 200, col)
	end
end)

• RNDX: 140 FPS
• draw.RoundedBox: 43 FPS

150 Calls x y w h of 10, 10, 700, 700

• Current RNDX: 107 fps
• Previous RNDX: 73 fps
• https://pastebin.com/urx4Qvez : 59 fps

RNDX is open-source and free to use. Feel free to contribute or report issues on GitHub!

Make sure to give credits!

• ficool2 - For sdk_screenspace_shaders & finding out that we can use shaders in source engine games!
• Rubat - For allowing us to use shaders in Garry's Mod!
• Svetov/Jaffies/FriendlyStealer - For lots of help throughout the development of RNDX! Also suggested multiple stuff to improve the performance!
• Shadertoy Rounded Code
• Shadertoy Blur Code
• And AI because I don't understand how shaders work!

RNDX: Because drawing rounded shapes should be simple, fast, and beautiful. 🎉