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115 lines
5.4 KiB
Plaintext
115 lines
5.4 KiB
Plaintext
Charles Mcdonald
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================
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Released his SMS emulator since 0.9 under the GPLv2+.
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It stayed like so until after version 1.5 (source code to version 1.5 got lost unfortunately but we still have SmSPlus-GX thankfully).
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After version 1.5, he decided to switch it to a non-commercial license, turning it proprietary again.
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(The reason being he got legal threats from some companies using his emulator)
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He also contributed modifications to sn76489.c, i contacted him and he told me it fell under the same license as Maxim's.
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ekeeke
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======
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He worked on SMSPlus-GX, with several improvements such as improved accuracy, fixing bugs with most games etc...
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It was originally designed for the Gamecube/Wii.
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https://github.com/ekeeke/smsplus-gx
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This fork also has code for Colecovision but Colecovision support seems to be a bit spotty and requires a BIOS.
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The overscan code got removed because it was not useful and little to no SMS games make use of it.
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Alekmaul
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=========
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He came up with the bitmap_scale function. That function is solely used for the menu and unscaled.
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drowsnug95
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==========
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Came up with upscale_160x144_to_212x144 and upscale_160x144_to_212x160.
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License should fall under the GPLv2+.
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Harteex
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========
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Came up with the TGA font loading code and he converted the fonts to a c array with bin2h.
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dmitrysmagin
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=============
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- Menu code based on his fork sms_sdl-rzx50 available here :
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https://github.com/dmitrysmagin/sms_sdl-rzx50
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I suspect he also did the SDL sound code that was found in FBA-SDL.
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That code is so much better than what we used to have so thank you Dmitry !
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exmortis@yandex.ru, joyrider
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============================
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They are mostly responsible for making the initial port of Dingux-SMS for the Dingoo.
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I don't think there's much of their code left, if any.
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The SDL sound code was very poor and got entirely replaced by the one found in FBA-SDL.
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PocketSprite
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============
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Patches to switch SMS Plus to EightyOne's Z80 CPU core. (based itself on FUSE)
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https://github.com/PocketSprite/8bkc-gamegear/commit/cd3510d12feb8f922c0505a2a47e4a58b5fef9f0
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Contrarely to what they say, it is based on SMS Plus 0.9, not SMS Plus 1.3 with the TMS support and all.
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The fact that it uses sms_frame (rather than system_frame from SMS Plus 1.2+) further confirms this.
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This patch switches to a GPLv2 Z80 Core so it can be used for commercial use, which is what they did.
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Anyway, those patches wouldn't work as is on SMS Plus 1.2 but they did tell me how i should switch to another Z80's core.
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And for that, i am very grateful.
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Most of my issues with it were related to irq & cpureadmap (which turns out, required minor changes for it to work)
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EightyOne ZX81
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==============
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https://github.com/PocketSprite/8bkc-gamegear/commit/cd3510d12feb8f922c0505a2a47e4a58b5fef9f0
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(Based on that)
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https://github.com/libretro/81-libretro/tree/master/81/z80
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See PocketSprite's patches. This CPU core is much less accurate and is unable to run games like Dizzy and some SG-1000 games.
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Juergen's z80 cpu core on the other hand, does not suffer from these issues.
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I am planning on removing this core in the future due to how crap it is but i will leave it for now.
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Juergen Buchmueller
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====================
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He made the z80 core for SMS Plus and later released an updated one for MAME under the BSD-3 license.
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He declined releasing the old z80's core so i had to reconvert the MAME core for our use in SMS Plus GX.
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CrabEmu
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========
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https://github.com/OpenEmu/CrabEmu-Core/blob/master/sound/sn76489.c
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https://github.com/OpenEmu/CrabEmu-Core/blob/master/sound/ym2413.c
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The ym2413 & sn76489 sound emulators from CrabEmu were used as the stock ones provided with SMS_Plus did not clarify their licenses.
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ym2413.c is based on MAME's GPLv2 code, with some modifications that switches it to C as well as provide some functions to use it more easily.
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The changes are also released under the GPLv2.
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sn76489.c by CrabEmu does not seem to be based upon any code other than Maxim's documentation and some snippets of code.
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It shares little to no similarity with Maxim's code and it is also released under the GPLv2.
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Gameblabla, me
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==============
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I switced most variables to c99 data types: this fixed rendering issues on 64-bits and somewhat broken PSG sound for Maxim's PSG core.
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I also improved PocketSprite's EightyOne patches for making sure it works with the newer SMS Plus version. (not as straightfoward as it might seem !)
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Disabled collision check for 9th sprite : doing so passes Flubba's test.
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Fixed support for 256 pages. This fixes Bad Apple SMS. (also added it to the ROM database list as it requires PAL timings)
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I made specific changes for each devices, like the RS-97. They can be found under their own subfolders in src/ports.
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I'm also responsible for making MAME's z80 core work with SMS Plus GX. (it was similar but with some improvements)
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Another thing i did was to port it to several sound APIs such as ALSA, OSS, Portaudio, libao and pulseaudio.
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I am releasing the changes under the GPLv2+, just to make things clear.
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Maxim
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=====
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He's the author of sn76489.c (not crabemu's one), a sn76489 emulator.
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Contacted by email, he said that it was released along with in_vgm as a whole under this license :
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You are allowed to do what you like with it just so long as:
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1. You let me know if you distribute it (any included files or anything derived from them), and
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2. You don't pass it off as your own.
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Clause 1 is problematic and potentially makes it non-free. (He did say that he plans to relicense it)
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As a failsafe, CrabEmu's PSG emulation is also provided.
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