Dreamcas KOS help

[lalacomun]

Hi, a few days ago i started with dreamcast development, im working a bit with SDL, but when i try to load an image EX: SDL_Surface *img = SDL_LoadBMP("image.bmp"); it doesnt load it, i read about KOS Romdisk but i dont know how to use it with the makefile, so is there any other way for loading files???

[Falco Girgis]

Hi, a few days ago i started with dreamcast development, im working a bit with SDL, but when i try to load an image EX: SDL_Surface *img = SDL_LoadBMP("image.bmp"); it doesnt load it, i read about KOS Romdisk but i dont know how to use it with the makefile, so is there any other way for loading files???

...If you aren't mounting a ramdisk/romdisk, where exactly is your image located at?

Building a romdisk in KOS is a very easy extra step in your makefile. Just look at any image/texture examples in KOS.

If you're using a coder's cable or broadband adapter, you can also stream your file directly from the host machine via the "/pc/" virtual directory:

Code: Select all

//Loads directly from your PC.
SDL_Surface *img = SDL_LoadBMP("/pc/image.bmp");

The actual location "pc" points to on the host depends on whether you're running a real Linux distro or Cygwin. You can always create a new file/print the current directory from the Dreamcast to see where the hell you are.

Keep in mind that /pc/ is extremely slow with a coder's cable, and EXREMELY fast with a BBA. I'm assuming the USB coder's cable is somewhere in between.

[lalacomun]

Hi, a few days ago i started with dreamcast development, im working a bit with SDL, but when i try to load an image EX: SDL_Surface *img = SDL_LoadBMP("image.bmp"); it doesnt load it, i read about KOS Romdisk but i dont know how to use it with the makefile, so is there any other way for loading files???

...If you aren't mounting a ramdisk/romdisk, where exactly is your image located at?

Building a romdisk in KOS is a very easy extra step in your makefile. Just look at any image/texture examples in KOS.

If you're using a coder's cable or broadband adapter, you can also stream your file directly from the host machine via the "/pc/" virtual directory:

Code: Select all

//Loads directly from your PC.
SDL_Surface *img = SDL_LoadBMP("/pc/image.bmp");

The actual location "pc" points to on the host depends on whether you're running a real Linux distro or Cygwin. You can always create a new file/print the current directory from the Dreamcast to see where the hell you are.

Keep in mind that /pc/ is extremely slow with a coder's cable, and EXREMELY fast with a BBA. I'm assuming the USB coder's cable is somewhere in between.

Thanks for the response, right now im using an emulator, so i cant use /pc/image.bmp i made a new makefile, that creates a romdisk.img and a romdisk.o, but it seems that the program isnt loading the file correctly
now for loading the image i use the folowing code:

Code: Select all

SDL_Surface*img = SDL_LoadBMP("/rd/image.bmp");

and the image is located on a folder called romdisk
this is the makefile:

Code: Select all

TARGET = video_test

OPTFLAGS=-O3 -fomit-frame-pointer

KOS_CFLAGS+= -I$(KOS_BASE)/../kos-ports/include/SDL-1.2.9 $(OPTFLAGS) 

all: $(TARGET).bin

include $(KOS_BASE)/Makefile.rules

.SRCS	=	video_test.c \

OBJS = $(.SRCS:.c=.o)

clean:
	rm -f $(OBJS) $(TARGET).elf $(TARGET).bin 
	-rm -f romdisk.*
	
rm-elf:
	-rm -f romdisk.*

$(TARGET).elf: $(OBJS) romdisk.o
	$(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -o $(TARGET).elf $(KOS_START) \
		$(OBJS) romdisk.o -lSDL_129 -lm $(OBJEXTRA) $(KOS_LIBS)

$(TARGET).bin: $(TARGET).elf
	$(KOS_OBJCOPY) -R .stack -O binary $(TARGET).elf $(TARGET).bin

romdisk.img:
	$(KOS_GENROMFS) -f romdisk.img -d romdisk -v

romdisk.o: romdisk.img
	$(KOS_BASE)/utils/bin2o/bin2o romdisk.img romdisk romdisk.o

run: $(TARGET).bin
	$(KOS_LOADER) $(TARGET).bin

dist:
	rm -f $(OBJS) romdisk.o romdisk.img
	$(KOS_STRIP) $(TARGET)

Any suggestions???

[Dormoxx]

Do you have something like this:

Code: Select all

extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);

right outside your main()?

[lalacomun]

Do you have something like this:

Code: Select all

extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);

right outside your main()?

Dude, i feel like an idiot, i had that, but inside my main function, now is working great!!
Thanks for all your responses!!

[Dormoxx]

Do you have something like this:

Code: Select all

extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);

right outside your main()?

Dude, i feel like an idiot, i had that, but inside my main function, now is working great!!
Thanks for all your responses!!

Hey, no problem. The only way I knew it was supposed to be outside of main() is because when I first started with KOS, I modified the PNG example and it was there, so I kept it there.

[Falco Girgis]

Do you have something like this:

Code: Select all

extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);

right outside your main()?

Dude, i feel like an idiot, i had that, but inside my main function, now is working great!!
Thanks for all your responses!!

Hey, no problem. The only way I knew it was supposed to be outside of main() is because when I first started with KOS, I modified the PNG example and it was there, so I kept it there.

Oh, snap. I was totally just reading your thread on DCemulation.org!