mirror of
https://github.com/RaySollium99/picodrive.git
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73 lines
4.2 KiB
Markdown
73 lines
4.2 KiB
Markdown
This is my foray into dynamic recompilation using PicoDrive, a
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Megadrive / Genesis / Sega CD / Mega CD / 32X / SMS emulator.
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I added support for MIPS (mips32r2), ARM64 (armv8), RISC-V (RV64IM) and
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PowerPC (G4/2.03) support to the SH2 recompiler, as well as spent much effort to
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optimize the DRC-generated code. I also optimized SH2 memory access inside the
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emulator, and did some work on M68K/SH2 CPU synchronization to fix some problems
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and speed up the emulator.
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It got a bit out of hand. I ended up doing fixes and optimizations all over the
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place, mainly for 32X and CD, graphics handling, sound, and probably some more,
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see the commit history. As a result, 32X emulation speed has improved a lot, a
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lot of bugs were fixed, and some new features (e.g. chd file support) have been
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added.
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### compiling
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I mainly worked with standalone PicoDrive versions as created by configure/make.
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A list of platforms for which this is possible can be obtained with
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> configure --help
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If you want to build an executable for a unixoid platform not listed in the
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platform list, just use
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> configure --platform=generic
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If DRC is available for the platform, it should be enabled automatically.
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For other platforms using a cross-compiling toolchain I used this,
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assuming $TC points to the appropriate cross compile toolchain directory:
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platform|toolchain|configure command
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--------|---------|-----------------
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gp2x,wiz,caanoo|open2x|CROSS_COMPILE=arm-open2x-linux- CFLAGS="-I$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/include" LDFLAGS="--sysroot $TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux -L$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib" ./configure --platform=gp2x
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gp2x,wiz,caanoo|open2x with ubuntu arm gcc 4.7|CROSS_COMPILE=arm-linux-gnueabi- CFLAGS="-I$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/include" LDFLAGS="-B$TC/gcc-4.1.1-glibc-2.3.6/lib/gcc/arm-open2x-linux/4.1.1 -B$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib -L$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib" ./configure --platform=gp2x
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dingux|dingux|CROSS_COMPILE=mipsel-linux- CFLAGS="-I$TC/usr/include -I$TC/usr/include/SDL" LDFLAGS="--sysroot $TC -L$TC/lib" ./configure --platform=dingux
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dingux|dingux with ubuntu mips gcc 5.4|CROSS_COMPILE=mipsel-linux-gnu- CFLAGS="-I$TC/usr/include -I$TC/usr/include/SDL" LDFLAGS="-B$TC/usr/lib -B$TC/lib -Wl,-rpath-link=$TC/usr/lib -Wl,-rpath-link=$TC/lib" ./configure --platform=dingux
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retrofw|retrofw|CROSS_COMPILE=mipsel-linux- CFLAGS="-I $TC/include -I $TC/include/SDL -Wno-unused-result" LDFLAGS="--sysroot $TC/mipsel-buildroot-linux-uclibc/sysroot" ./configure --platform=retrofw
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gcw0|gcw0|CROSS_COMPILE=mipsel-gcw0-linux-uclibc- CFLAGS="-I$TC/usr/mipsel-gcw0-linux-uclibc/sysroot/usr/include -I$TC/usr/mipsel-gcw0-linux-uclibc/sysroot/usr/include/SDL" LDFLAGS="--sysroot $TC/usr/mipsel-gcw0-linux-uclibc/sysroot" ./configure --platform=gcw0
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rg350|rg350|CROSS_COMPILE=mipsel-linux- CFLAGS="-I$TC/usr/include -I$TC/usr/include/SDL" LDFLAGS="--sysroot $TC -L$TC/lib" ./configure --platform=rg350
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For gp2x, wiz, and caanoo you may need to compile libpng first.
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After configure, compile with
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> make
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### helix MP3 decoder for ARM
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For 32 bit ARM platforms, there is the possibility to compile the helix MP3
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decoder into a shared library to be able to use MP3 audio files with CD games.
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The helix source files aren't supplied because of licensing issues. However, if
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you have obtained the sources, put them into the platform/common/helix
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directory, set CROSS to your cross compiler prefix (e.g. arm-linux-gnueabi-)
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and LIBGCC to your cross compiler's libgcc.a
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(e.g. /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/libgcc.a), and compile with
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> make -C platform/common/helix CROSS=$CROSS LIBGCC=$LIBGCC
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Copy the resulting ${CROSS}helix_mp3.so as libhelix.so to the directory where
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the PicoDrive binary is.
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### installing
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You need to install the resulting binary onto your device manually.
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For opendingux, gcw0, and rg350, copy the opk to your SD card.
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For gp2x, wiz, and caanoo, the easiest way is to unpack
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[PicoDrive_191.zip](http://notaz.gp2x.de/releases/PicoDrive/PicoDrive_191.zip)
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on your SD card and replace the PicoDrive binary.
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For legacy dingux, unpack the dge zip and copy the files to your SD card.
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Send bug reports, fixes etc to <derkub@gmail.com>
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