Retro Dither Shader - Gamemaker Studio

*WIP*

The RFX Shader suite is a library of shaders and scripts designed to give your Gamemaker projects that retro paletted dithery look of yesteryear.

Features:

• Pixelation - including double wide pixels.
• SSAA - optional control for reduced aliasing and moire, doesn't require display_reset to use!
• Two color limiting shaders - LUT based and Color Depth limiting
• Multiple draw functions for drawing surfaces or sprites with the effect enabled.
• Includes sample Luts
• Includes bayer and blue noise dither textures

To make your own LUT, follow this guide, be sure to download a copy of the LUT provided on this page as it matches the format used by the RFX Suite: https://docs.unity3d.com/540/Documentation/Manual/script-ColorCorrectionLookup.h...

To use the suite:

The following will set key values for the system:

• RFX_init(pixel width, dither texture, dither spread, SSAA(?), double wide pixels(?))

The following will set which method to use:

• RFX_set_palswap( Lut texture )
• RFX_set_coldepth(Color Depth) (Lower the Depth for fewer colors)

To use the shaders on a sprite or surface:

• RFX_draw_sprite( sprite, index, xx, yy, xScale(?), yScale(?), Rot(?), Col(?), Alpha(?))
• RFX_draw_surface(surface, xx, yy, xScale(?), yScale(?), Rot(?), Col(?), Alpha(?))

To apply to the screen you can use the RFX_draw_surface function with application_surface in the draw_gui event, or you can use the following the draw_gui event:

• RFX_apply_screen()

Feel free to post any questions or requests below!

*(?) arguments are optional and can be left out to use the default values.