GPU demo program, run on Raspberry Pi 2

Raspbian (http://www.raspberrypi.org/downloads/) come with a number of demo program for the GPU, Broadcom VideoCore, in /opt/vc/src/hello_pi.


/opt/vc/src/hello_pi/README

Building on Pi
++++++++++++++

To build the test apps on the pi, first build the libs:
make -C libs/ilclient
make -C libs/vgfont

then by entering each test app directory and run make. E.g.
  cd hello_world
  make
  ./hello_world.bin

Running ./rebuild.sh will rebuild the all libs and and apps.


Building on a different PC
++++++++++++++++++++++++++

If you want to build the samples on a different machine (cross-compile) then set:
SDKSTAGE=<path/to/firmware-directory> and CC=<path/to/cross-compiler>
before running make.

To build all the demo program, switch to the folder /opt/vc/src/hello_pi, enter command:
$ ./rebuild.sh

Press Ctrl+C to exit running demo program.

Programming Hello World with Java on Raspberry Pi

To start program on Raspberry Pi using Java programming, what you need are JDK for Raspberry Pi and a simple text editor such as the build-in LeafPad.

Edit the code with LeafPad, with name of helloPi.java:

class helloPi
{
 public static void main(String srgs[])
 {
  
  System.out.println("Hello Raspberry Pi");
 }
}

Then compile an run it with the command:
$ javac helloPi.java
$ java helloPi