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sdl: add SDL_RWFromConstMem (sdl2) and SDL_IOFromMem (sdl3)

--- a/include/npe/SDL2/SDL_rwops.h

+++ b/include/npe/SDL2/SDL_rwops.h

@@ -22,6 +22,7 @@

 SDL_RWops *SDL_RWFromFile(const char *, const char *);

 SDL_RWops *SDL_RWFromMem(void*, int);

+SDL_RWops *SDL_RWFromConstMem(const void*, int);

 size_t SDL_RWread(SDL_RWops *, void *, size_t, size_t);

 size_t SDL_RWwrite(SDL_RWops *, const void *, size_t, size_t);

 vlong SDL_RWseek(SDL_RWops *, vlong, int);

--- a/include/npe/SDL3/SDL_iostream.h

+++ b/include/npe/SDL3/SDL_iostream.h

@@ -12,6 +12,7 @@

 };

 SDL_IOStream* SDL_IOFromFile(const char *file, const char *mode);

+SDL_IOStream* SDL_IOFromMem(void *mem, size_t size);

 SDL_IOStream* SDL_IOFromConstMem(const void *mem, size_t size);

 size_t SDL_WriteIO(SDL_IOStream *context, const void *ptr, size_t size);

 bool SDL_CloseIO(SDL_IOStream *context);

--- a/libnpe_sdl2/rwops.c

+++ b/libnpe_sdl2/rwops.c

@@ -93,6 +93,18 @@

 	return o;

 }

+SDL_RWops*

+SDL_RWFromConstMem(const void *mem, int size)

+{

+	SDL_RWops *o;

+

+	o = SDL_RWFromMem(mem, size);

+	if(o == nil)

+		return nil;

+	o->write = nil;

+	return o;

+}

+

 size_t

 SDL_RWread(SDL_RWops *o, void *b, size_t sz, size_t n)

 {

--- a/libnpe_sdl3/iostream.c

+++ b/libnpe_sdl3/iostream.c

@@ -83,7 +83,7 @@

 }

 SDL_IOStream*

-SDL_IOFromConstMem(const void *mem, size_t size)

+SDL_IOFromMem(void *mem, size_t size)

 {

 	SDL_IOStream *o;

 	Membuf *b;

@@ -96,12 +96,23 @@

 	b->memdata = mem;

 	b->memn = size;

 	b->mempos = 0;

-

 	o->size = memsize;

 	o->seek = memseek;

 	o->read = memread;

 	o->write = memwrite;

 	o->close = memclose;

+	return o;

+}

+

+SDL_IOStream*

+SDL_IOFromMem(const void *mem, size_t size)

+{

+	SDL_IOStream *o;

+

+	o = SDL_IOFromMem(mem, size);

+	if(o == nil)

+		return nil;

+	o->write = nil;

 	return o;

 }

-- 

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