Re: [KOS] Problems compiling SDL 2 samples

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OK, so I've made some progress and have successfully compiled an SDL 2
sample - it runs and gives me a black screen but as I only have an SD card
reader and no coders cable I have no way to debug that...

Anyway, one thing that I can't figure out is that in the SDL 1.x port if
HAVE_OPENGL is defined a function called glKosGetProcAddress is used - I
can't find any reference to that function anywhere and I'm pretty sure it
doesn't work if you compile with that setting.

So, what would be the equivalent of GetProcAddress on Kos? dlopen doesn't
seem to exist, does Kos have something similar?

On 11 February 2016 at 13:28, Lawrence Sebald <blu...@gm...> wrote:

> Those are fairly easily explained…
>
> Environment variables are not supported in KOS, so getenv/setenv don't
> actually exist in libkallisti. Don’t define HAVE_GETENV and HAVE_SETENV in
> your SDL_config_dreamcast.h file. SDL has a built-in implementation that
> will be compiled in if you don’t define those.
>
> The second one should go away if you link with libm.
>
> On Feb 11, 2016, at 5:06 AM, Luke Benstead <ka...@gm...> wrote:
>
> Thank you! I've disabled DYNAMIC_API on the DC, and I realized that
> __DREAMCAST__ is not what I should be checking for, but _arch_dreamcast
> (facepalm).
>
> Now I'm down to a couple of atomic-related SDL references, and stuff like
> this:
>
> /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/libSDL2.a(SDL_getenv.o):
> In function `SDL_getenv':
> /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/src/stdlib/SDL_getenv.c:182:
> undefined reference to `_getenv'
> /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/libSDL2.a(SDL_stdlib.o):
> In function `SDL_atan2':
> /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/src/stdlib/SDL_stdlib.c:48:
> undefined reference to `_atan2'
>
>
> Which I'm guessing is down to me not linking a KOS library or something?
> I'll take a look later when I find time. Thanks again!
>
> On 11 February 2016 at 08:45, Harley Laue <los...@gm...>
> wrote:
>
>> $ make
>> rm -f example.elf
>> kos-cc -o example.elf testdraw2.o -lSDL2
>> testdraw2.o: In function `DrawPoints':
>> /usr/local/dc/kos-ports/SDL2-test/build/SDL2-2.0.4/test/testdraw2.c:79:
>> undefined reference to `_SDL_RenderGetViewport'
>> ...
>> /usr/local/dc/kos-ports/SDL2-test/build/SDL2-2.0.4/test/testdraw2.c:299:
>> undefined reference to `_SDL_atoi'
>> collect2: error: ld returned 1 exit status
>> Makefile:28: recipe for target 'example.elf' failed
>> make: *** [example.elf] Error
>> $ sh-elf-nm $KOS_PORTS/lib/libSDL2.a | grep -E "(RenderGetViewport|atoi)"
>>          U _SDL_atoi_REAL
>>          U _SDL_atoi_REAL
>>          U _SDL_atoi_REAL
>>          U _SDL_atoi_REAL
>>          U _SDL_atoi_REAL
>> 00000000 T _SDL_RenderGetViewport_REAL
>>          U _atoi
>> 00000000 T _SDL_atoi_REAL
>>          U _SDL_atoi_REAL
>>
>> $ grep -Er "(RenderGetViewport_REAL|SDL_atoi_REAL)"
>> src/dynapi/SDL_dynapi_overrides.h:#define SDL_RenderGetViewport
>> SDL_RenderGetViewport_REAL
>> src/dynapi/SDL_dynapi_overrides.h:#define SDL_atoi SDL_atoi_REAL
>>
>>
>> From what I can tell, SDL2 wants SDL_dynapi defined for all platforms.
>>
>>
>> On 02/10/2016 08:13 AM, Luke Benstead wrote:
>>
>> Thanks OK, I just wanted to make sure that what I was doing in the
>> makefile wasn't obviously wrong... I'll keep digging! Thanks!
>>
>> On 10 February 2016 at 15:34, Lawrence Sebald <blu...@gm...> wrote:
>>
>>> Unfortunately, I have no idea why you’d be having that particular issue
>>> off the top of my head. It looks like you’re compiling in the SDL_render.c
>>> file into your library, which is where those functions are implemented, so
>>> I don’t really know…
>>>
>>> The only thing I can guess is that somehow you’re picking up an old
>>> version of the library where you didn’t compile that in or something? Try
>>> rebuilding the entire library and then the program again?
>>>
>>> I really know next to nothing about SDL2, which I suppose doesn’t help
>>> here...
>>>
>>> On Feb 10, 2016, at 4:03 AM, Luke Benstead <ka...@gm...> wrote:
>>>
>>> Hi there!
>>>
>>> I've managed to get the SDL 2 port to a state where it compiles, but is
>>> untested. My SD card adapter just arrived so I figured I'd try to compile
>>> one of the SDL 2 sample applications to test the port.
>>>
>>> I added the following target to the KOSMakefile.mk file:
>>>
>>>
>>> defaultall: replacefiles $(OBJS) subdirs linklib buildsamples
>>>
>>> TESTDRAW2_SRCS = $(CURDIR)/test/testdraw2.c
>>> TESTDRAW2_OBJS = $(CURDIR)/test/testdraw2.o
>>> TESTDRAW2_TARGET = testdraw2.elf
>>>
>>> buildsamples:
>>>     $(KOS_CC) $(CFLAGS) -Iinclude -c $(TESTDRAW2_SRCS) -o
>>> $(TESTDRAW2_OBJS)
>>>     $(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -L$(CURDIR) -Iinclude -o
>>> $(TESTDRAW2_TARGET) $(KOS_START) $(TESTDRAW2_OBJS) $(KOS_LIBS) -lSDL2
>>>
>>> No matter what incantation I use to build the source file, I still end
>>> up with undefined references to the SDL 2 functions. e.g.
>>>
>>> /home/lukeb/Dreamcast/kos-ports/SDL2/build/SDL2-2.0.4/test/testdraw2.o:
>>> In function `_DrawPoints':
>>> testdraw2.c:(.text+0x1a0): undefined reference to
>>> `_SDL_RenderGetViewport'
>>> testdraw2.c:(.text+0x1b8): undefined reference to
>>> `_SDL_SetRenderDrawColor'
>>> testdraw2.c:(.text+0x1c4): undefined reference to `_SDL_RenderDrawPoint'
>>>
>>>
>>> Am I missing something obvious? Grepping for those functions does find
>>> them in libSDL2.a which I'm linking to. I've tried changing the order of
>>> the GCC args, and also tried just compiling the source file directly rather
>>> than to an object file first.
>>>
>>> I'd appreciate any suggestions you might have!
>>>
>>> Thanks,
>>>
>>> Luke.
>>>
>>>
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>>
>>
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>
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