The Raspberry Pi GPU

Overview

• The Raspberry Pi has a dual-core SoC Broadcom GPU, the BCM2835.
• The datasheet is online at ALLDATASHEET.NET
• Open Source ARM userspace, a blog posting at RaspberryPi.org, describes the Raspnerry Pi FOundation's shift to Open Source GPU Drivers.
• This blog post – userland github #link – has links to source code and documentation targeted to the BCM2835.
• <https://github.com/raspberrypi/userland>
• OpenGL 4 Reference Pages

userland GPU libraries

This is a [incomplete] list of the GPU-related libraries provided by the Open Source ARM userland.

EGL

mmal

• MMAL:mmal_parse_video_size()
• Multi-Media Abstraction Layer (MMAL)
• Decde Video in Raspberry Pi without using OpenMAX – a question on stackoverflow.com about how to bypass the OpenMAX API layer...
• Raspberry Pi Stack Exchange — MMAL stands for Multi-Media Abstraction Layer. The MMAL API runs over OpenMAX. MMAL is a Broadcom specific API used only on Videocore 4 systems.

GLESv2

• ESGLES Frambuffer Code Sighting (urth tech blog post)
• OpenGL ES Development for Android

vcos

openmaxil

vchiq_arm

bcm_host

WFC

OpenVG™

• OpenVG Specification Version 1.1
• “OpenVG 1.0 is an application programming interface (API) for hardware accelerated two-dimensional vector and raster graphics.” ~ OpenVG™ at Khronos Group
• OpenVG™ Quick Reference Card (PDF)
• openvg.h

Wayland Graphics

• <http://wayland.freedesktop.org/architecture.html>

• Typically, hardware enabling includes modesetting/display and EGL/GLES2

• The open source implementation in the mesa EGL stack is in wayland-egl.c and platform_wayland.c.