904 My first demoscene
904 : My first demoscene
- Author: Riccardo Pellegrini
- Description: Tiny Tapeout VGA demoscene logo inspired by the TT mark.
- GitHub repository
- Open in 3D viewer
- Open in VGA Playground
- Clock: 25000000 Hz
How it works
This project is a small demoscene-style VGA generator designed for Tiny Tapeout.
It generates a 640x480 @ 60Hz video signal using simple raster timing logic and outputs it through the VGA PMOD interface. The image is computed entirely in hardware using combinational logic, without any frame buffer or external memory.
The visual consists of:
- A procedurally generated animated background using XOR patterns
- A central logo inspired by the Tiny Tapeout mark:
- A circular shape with a black outline
- A solid white fill
- Two stylized "T" letters rendered in black inside the circle
The circle is computed using a squared distance approximation (dx² + dy²), while the letters are built from rectangular regions. This keeps the design simple and synthesizable while still producing a recognizable graphic.
The design uses reduced-resolution coordinates internally to minimize logic usage, resulting in a pixelated / retro visual style similar to classic demoscene effects.
How to test
- Connect a VGA PMOD to the Tiny Tapeout demo board
- Power the board and select the project using the Tiny Tapeout commander
- Reset the design
You should see:
- An animated background
- A central circular logo with two black "T" letters inside
Optional controls via ui_in:
ui_in[0]: invert colorsui_in[1]: freeze the logo at the center of the screen
External hardware
- VGA PMOD (required for video output)
No additional hardware is required.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | invert colors | red[1] | |
| 1 | freeze logo at center | green[1] | |
| 2 | blue[1] | ||
| 3 | vsync | ||
| 4 | red[0] | ||
| 5 | green[0] | ||
| 6 | blue[0] | ||
| 7 | hsync |