janrinze / graphite

Open Source 2D/3D Graphics Accelerator

Graphite

Graphite is a FPGA based open source 2D/3D graphics accelerator.

Features

• Draw line;
• Draw textured triangle.

Requirements

• SDL2
• Verilator 4.213 or above

Getting Started

git clone https://github.com/danodus/graphite.git
cd graphite/rtl/sim
make run

• Press 1 to select the cube model;
• Press 2 to select the teapot model;
• Press W/A/S/D and arrows to move the camera;
• Press SPACE to start/stop the rotation of the model;
• Press TAB to enable/disable the wireframe mode;
• Press T to enable/disable texture mapping;
• Press L to increase the number of directional lights;
• Press G to enable/disable Gouraud shading.

System on Chip

A SoC for the ULX3S is also available with the following features:

• RISC-V (RV32I + Graphite extension)
• UART (115200/230400-N-8-1)
• SDRAM (32MiB shared between CPU and video)
• Set associative cache (4-way with LRU replacement policy)
• 640x480 HDMI video output with framebuffer (ARGB4444)
• Graphite 2D/3D graphics accelerator
• PS/2 keyboard
• PS/2 mouse
• SD Card with hardware SPI

cd soc/src/bios
make
cd ../../rtl/ulx3s
make prog
cd ../../src/examples/test_graphite
make run SERIAL=<serial device>

Open a serial terminal at 230400 bauds and press 'h' for help.

References

The SoC is based on the Oberon project for the ULX3S available here: https://github.com/emard/oberon.