RPi example

README.md

@@ -28,6 +28,10 @@ On OS X system OpenAL framework is used.
 
 [Android example](https://github.com/gen2brain/raylib-go/tree/master/examples/android/example).
 
+##### Raspberry Pi
+
+[RPi example](https://github.com/gen2brain/raylib-go/tree/master/examples/rpi/basic_window).
+
 ### Installation
 
     go get -v github.com/gen2brain/raylib-go/raylib

examples/README.md

@@ -0,0 +1,3 @@
+## Examples
+
+Live (web/emscripten) examples are available on [raylib website](http://www.raylib.com/examples.html).

examples/android/example/bootstrap.sh

@@ -22,28 +22,28 @@ export PATH=${INSTALL_PREFIX}/android-arm7/bin:${INSTALL_PREFIX}/android-arm64/b
 BUILD_DIR=`mktemp -d`
 mkdir -p ${BUILD_DIR}/bootstrap
 
-echo "Make standalone android toolchains"
+echo "##### Make standalone android toolchains"
 ${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh --platform=android-9 --install-dir=${INSTALL_PREFIX}/android-arm7 --toolchain=arm-linux-androideabi-4.9
 ${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh --platform=android-21 --install-dir=${INSTALL_PREFIX}/android-arm64 --toolchain=aarch64-linux-android-4.9
 
-echo "Download Go binaries"
+echo "##### Download Go binaries"
 cd ${BUILD_DIR}/bootstrap && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.${GO_OS}-${GO_ARCH}.tar.gz | tar xz
 
-echo "Download Go source"
+echo "##### Download Go source"
 cd ${BUILD_DIR} && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.src.tar.gz | tar xz && cd ${BUILD_DIR}/go/src
 
-echo "Compile Go for host"
+echo "##### Compile Go for host"
 GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go ./make.bash || exit 1
 
-echo "Compile Go for arm-linux-androideabi"
+echo "##### Compile Go for arm-linux-androideabi"
 GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go CC_FOR_TARGET=arm-linux-androideabi-gcc GOOS=android GOARCH=arm CGO_ENABLED=1 ./make.bash --no-clean || exit 1
 
-echo "Compile Go for aarch64-linux-android"
+echo "##### Compile Go for aarch64-linux-android"
 GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go CC_FOR_TARGET=aarch64-linux-android-gcc GOOS=android GOARCH=arm64 CGO_ENABLED=1 ./make.bash --no-clean || exit 1
 
 cp -r -f ${BUILD_DIR}/go ${INSTALL_PREFIX}
 
-echo "Compile OpenAL"
+echo "##### Compile OpenAL"
 
 cd ${BUILD_DIR} && curl -s -L  http://kcat.strangesoft.net/openal-releases/openal-soft-${OPENAL_VERSION}.tar.bz2 | tar -xj
 
@@ -75,7 +75,7 @@ cd ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-arm64
 cmake -DLIBTYPE=STATIC -DCMAKE_TOOLCHAIN_FILE=../android-arm64.cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}/android-arm64 ..
 make -j $(nproc) && make install
 
-echo "Compile android_native_app_glue"
+echo "##### Compile android_native_app_glue"
 
 mkdir -p ${BUILD_DIR}/native_app_glue/jni
 cp -r ${ANDROID_NDK_HOME}/sources/android/native_app_glue/* ${BUILD_DIR}/native_app_glue/jni/
@@ -89,5 +89,5 @@ cp ${BUILD_DIR}/native_app_glue/obj/local/arm64-v8a/libandroid_native_app_glue.a
 cp ${ANDROID_NDK_HOME}/sources/android/native_app_glue/android_native_app_glue.h ${INSTALL_PREFIX}/android-arm7/include/
 cp ${ANDROID_NDK_HOME}/sources/android/native_app_glue/android_native_app_glue.h ${INSTALL_PREFIX}/android-arm64/include/
 
-echo "Remove build directory"
+echo "##### Remove build directory"
 rm -rf ${BUILD_DIR}

examples/rpi/basic_window/README.md

@@ -0,0 +1,20 @@
+### Raspberry Pi example
+
+To compile example for Raspberry Pi you will need RPi toolchain and userspace libraries, and Go must be cross compiled for linux/arm with that toolchain.
+
+There is a bootstrap.sh script that you can use to cross compile Go and OpenAL.
+
+Compile Go and OpenAL, /usr/local is prefix where Go and RPi toolchain and libraries will be installed:
+
+    ./bootstrap.sh /usr/local
+
+After build is complete point GOROOT to new Go installation in /usr/local, and add toolchain bin directory to PATH:
+
+    export GOROOT=/usr/local/go
+    export PATH=/usr/local/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:${PATH}
+
+And compile example:
+
+    CGO_CFLAGS="-I/usr/local/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/include -I/usr/local/vc/include -I/usr/local/vc/include/interface/vcos -I/usr/local/vc/include/interface/vmcs_host/linux -I/usr/local/vc/include/interface/vcos/pthreads" \
+    CGO_LDFLAGS="-L/usr/local/vc/lib -L/usr/local/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/lib -ldl" \
+    CC=arm-linux-gnueabihf-gcc CGO_ENABLED=1 GOOS=linux GOARCH=arm GOARM=6 ${GOROOT}/bin/go build -v -x

examples/rpi/basic_window/bootstrap.sh

@@ -0,0 +1,61 @@
+#!/bin/sh
+
+if [ -z "$1" ]; then
+    echo "Usage: bootstrap.sh <install prefix>"
+    exit 1
+fi
+
+GO_OS="linux"
+GO_ARCH="amd64"
+GO_VERSION=`curl -s https://golang.org/dl/ | grep 'id="go' | head -n1 | awk -F'"' '{print $4}'`
+
+OPENAL_VERSION="1.17.2"
+
+INSTALL_PREFIX="$1"
+export PATH=${INSTALL_PREFIX}/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:${PATH}
+
+BUILD_DIR=`mktemp -d`
+mkdir -p ${BUILD_DIR}/bootstrap
+
+echo "##### Download toolchain"
+cd ${BUILD_DIR} && git clone --depth=1 --branch=master https://github.com/raspberrypi/tools.git
+cp -r -f ${BUILD_DIR}/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64 ${INSTALL_PREFIX}
+
+echo "##### Download userspace libraries"
+cd ${BUILD_DIR} && git clone --depth=1 --branch=master https://github.com/raspberrypi/firmware.git
+cp -r -f ${BUILD_DIR}/firmware/hardfp/opt/vc ${INSTALL_PREFIX}
+
+echo "##### Download Go binaries"
+cd ${BUILD_DIR}/bootstrap && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.${GO_OS}-${GO_ARCH}.tar.gz | tar xz
+
+echo "##### Download Go source"
+cd ${BUILD_DIR} && curl -s -L http://storage.googleapis.com/golang/${GO_VERSION}.src.tar.gz | tar xz && cd ${BUILD_DIR}/go/src
+
+echo "##### Compile Go for host"
+GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go ./make.bash || exit 1
+
+echo "##### Compile Go for arm-linux-gnueabihf"
+GOROOT_BOOTSTRAP=${BUILD_DIR}/bootstrap/go CC_FOR_TARGET=arm-linux-gnueabihf-gcc GOOS=linux GOARCH=arm GOARM=6 CGO_ENABLED=1 ./make.bash --no-clean || exit 1
+
+cp -r -f ${BUILD_DIR}/go ${INSTALL_PREFIX}
+
+echo "##### Compile OpenAL"
+
+cd ${BUILD_DIR} && curl -s -L  http://kcat.strangesoft.net/openal-releases/openal-soft-${OPENAL_VERSION}.tar.bz2 | tar -xj
+
+cat << EOF > ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/linux-rpi.cmake
+set(TOOLCHAIN_PREFIX arm-linux-gnueabihf)
+set(CMAKE_C_COMPILER \${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_FIND_ROOT_PATH \${INSTALL_PREFIX}/gcc-linaro-arm-linux-gnueabihf-raspbian-x64)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+EOF
+
+mkdir -p ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-rpi
+cd ${BUILD_DIR}/openal-soft-${OPENAL_VERSION}/build-rpi
+cmake -DLIBTYPE=STATIC -DCMAKE_TOOLCHAIN_FILE=../linux-rpi.cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX}/gcc-linaro-arm-linux-gnueabihf-raspbian-x64 ..
+make -j $(nproc) && make install
+
+echo "##### Remove build directory"
+rm -rf ${BUILD_DIR}

examples/rpi/basic_window/main.go

@@ -0,0 +1,21 @@
+package main
+
+import "github.com/gen2brain/raylib-go/raylib"
+
+func main() {
+	raylib.InitWindow(800, 450, "raylib [rpi] example - basic window")
+
+	raylib.SetTargetFPS(60)
+
+	for !raylib.WindowShouldClose() {
+		raylib.BeginDrawing()
+
+		raylib.ClearBackground(raylib.RayWhite)
+
+		raylib.DrawText("Congrats! You created your first window!", 190, 200, 20, raylib.LightGray)
+
+		raylib.EndDrawing()
+	}
+
+	raylib.CloseWindow()
+}