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1 Raspberry Pi |
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2 ================================================================================ |
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3 |
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4 Requirements: |
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5 |
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6 Raspbian (other Linux distros may work as well). |
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7 |
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8 ================================================================================ |
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9 Features |
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10 ================================================================================ |
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11 |
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12 * Works without X11 |
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13 * Hardware accelerated OpenGL ES 2.x |
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14 * Sound via ALSA |
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15 * Input (mouse/keyboard/joystick) via EVDEV |
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16 * Hotplugging of input devices via UDEV |
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17 |
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18 ================================================================================ |
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19 Raspbian Build Dependencies |
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20 ================================================================================ |
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21 |
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22 sudo apt-get install libudev-dev libasound2-dev libdbus-1-dev |
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23 |
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24 You also need the VideoCore binary stuff that ships in /opt/vc for EGL and |
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25 OpenGL ES 2.x, it usually comes pre installed, but in any case: |
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26 |
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27 sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev |
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28 |
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29 ================================================================================ |
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30 Cross compiling from x86 Linux |
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31 ================================================================================ |
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32 |
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33 To cross compile SDL for Raspbian from your desktop machine, you'll need a |
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34 Raspbian system root and the cross compilation tools. We'll assume these tools |
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35 will be placed in /opt/rpi-tools |
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36 |
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37 sudo git clone --depth 1 https://github.com/raspberrypi/tools /opt/rpi-tools |
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38 |
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39 You'll also need a Rasbian binary image. |
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40 Get it from: http://downloads.raspberrypi.org/raspbian_latest |
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41 After unzipping, you'll get file with a name like: <date>-wheezy-raspbian.img |
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42 Let's assume the sysroot will be built in /opt/rpi-sysroot. |
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43 |
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44 export SYSROOT=/opt/rpi-sysroot |
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45 sudo kpartx -a -v <path_to_raspbian_image>.img |
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46 sudo mount -o loop /dev/mapper/loop0p2 /mnt |
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47 sudo cp -r /mnt $SYSROOT |
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48 sudo apt-get install qemu binfmt-support qemu-user-static |
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49 sudo cp /usr/bin/qemu-arm-static $SYSROOT/usr/bin |
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50 sudo mount --bind /dev $SYSROOT/dev |
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51 sudo mount --bind /proc $SYSROOT/proc |
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52 sudo mount --bind /sys $SYSROOT/sys |
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53 |
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54 Now, before chrooting into the ARM sysroot, you'll need to apply a workaround, |
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55 edit $SYSROOT/etc/ld.so.preload and comment out all lines in it. |
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56 |
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57 sudo chroot $SYSROOT |
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58 apt-get install libudev-dev libasound2-dev libdbus-1-dev libraspberrypi0 libraspberrypi-bin libraspberrypi-dev libx11-dev libxext-dev libxrandr-dev libxcursor-dev libxi-dev libxinerama-dev libxxf86vm-dev libxss-dev |
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59 exit |
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60 sudo umount $SYSROOT/dev |
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61 sudo umount $SYSROOT/proc |
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62 sudo umount $SYSROOT/sys |
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63 sudo umount /mnt |
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64 |
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65 There's one more fix required, as the libdl.so symlink uses an absolute path |
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66 which doesn't quite work in our setup. |
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67 |
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68 sudo rm -rf $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so |
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69 sudo ln -s ../../../lib/arm-linux-gnueabihf/libdl.so.2 $SYSROOT/usr/lib/arm-linux-gnueabihf/libdl.so |
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70 |
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71 The final step is compiling SDL itself. |
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72 |
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73 export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$SYSROOT -I$SYSROOT/opt/vc/include -I$SYSROOT/usr/include -I$SYSROOT/opt/vc/include/interface/vcos/pthreads -I$SYSROOT/opt/vc/include/interface/vmcs_host/linux" |
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74 cd <SDL SOURCE> |
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75 mkdir -p build;cd build |
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76 ../configure --with-sysroot=$SYSROOT --host=arm-raspberry-linux-gnueabihf --prefix=$PWD/rpi-sdl2-installed --disable-pulseaudio --disable-esd |
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77 make |
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78 make install |
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79 |
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80 To be able to deploy this to /usr/local in the Raspbian system you need to fix up a few paths: |
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81 |
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82 perl -w -pi -e "s#$PWD/rpi-sdl2-installed#/usr/local#g;" ./rpi-sdl2-installed/lib/libSDL2.la ./rpi-sdl2-installed/lib/pkgconfig/sdl2.pc ./rpi-sdl2-installed/bin/sdl2-config |
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83 |
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84 ================================================================================ |
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85 Apps don't work or poor video/audio performance |
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86 ================================================================================ |
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87 |
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88 If you get sound problems, buffer underruns, etc, run "sudo rpi-update" to |
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89 update the RPi's firmware. Note that doing so will fix these problems, but it |
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90 will also render the CMA - Dynamic Memory Split functionality useless. |
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91 |
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92 Also, by default the Raspbian distro configures the GPU RAM at 64MB, this is too |
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93 low in general, specially if a 1080p TV is hooked up. |
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94 |
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95 See here how to configure this setting: http://elinux.org/RPiconfig |
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96 |
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97 Using a fixed gpu_mem=128 is the best option (specially if you updated the |
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98 firmware, using CMA probably won't work, at least it's the current case). |
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99 |
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100 ================================================================================ |
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101 No input |
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102 ================================================================================ |
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103 |
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104 Make sure you belong to the "input" group. |
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105 |
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106 sudo usermod -aG input `whoami` |
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107 |
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108 ================================================================================ |
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109 No HDMI Audio |
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110 ================================================================================ |
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111 |
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112 If you notice that ALSA works but there's no audio over HDMI, try adding: |
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113 |
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114 hdmi_drive=2 |
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115 |
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116 to your config.txt file and reboot. |
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117 |
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118 Reference: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=5062 |
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119 |
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120 ================================================================================ |
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121 Text Input API support |
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122 ================================================================================ |
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123 |
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124 The Text Input API is supported, with translation of scan codes done via the |
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125 kernel symbol tables. For this to work, SDL needs access to a valid console. |
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126 If you notice there's no SDL_TEXTINPUT message being emitted, double check that |
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127 your app has read access to one of the following: |
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128 |
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129 * /proc/self/fd/0 |
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130 * /dev/tty |
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131 * /dev/tty[0...6] |
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132 * /dev/vc/0 |
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133 * /dev/console |
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134 |
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135 This is usually not a problem if you run from the physical terminal (as opposed |
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136 to running from a pseudo terminal, such as via SSH). If running from a PTS, a |
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137 quick workaround is to run your app as root or add yourself to the tty group, |
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138 then re login to the system. |
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139 |
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140 sudo usermod -aG tty `whoami` |
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141 |
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142 The keyboard layout used by SDL is the same as the one the kernel uses. |
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143 To configure the layout on Raspbian: |
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144 |
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145 sudo dpkg-reconfigure keyboard-configuration |
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146 |
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147 To configure the locale, which controls which keys are interpreted as letters, |
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148 this determining the CAPS LOCK behavior: |
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149 |
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150 sudo dpkg-reconfigure locales |
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151 |
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152 ================================================================================ |
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153 Notes |
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154 ================================================================================ |
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155 |
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156 * When launching apps remotely (via SSH), SDL can prevent local keystrokes from |
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157 leaking into the console only if it has root privileges. Launching apps locally |
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158 does not suffer from this issue. |
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159 |
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160 |