All the changes needed for the AmigaOS 4 port and release

.gitignore

@@ -0,0 +1,5 @@
+*.o
+*.d
+*.lha
+blues
+Crashlog*

Makefile.os4

@@ -0,0 +1,62 @@
+
+SDL_CFLAGS := -D__USE_INLINE__ -I/sdk/local/newlib/include/SDL2
+SDL_LIBS   := -lSDL2_mixer -lmikmod -lmodplug -lFLAC -logg -lSDL2 -lpthread -athread=native -lstdc++
+
+MODPLUG_LIBS ?=
+
+BB := decode.c game.c level.c objects.c resource.c screen.c sound.c staticres.c tiles.c unpack.c
+JA := game.c level.c resource.c screen.c sound.c staticres.c unpack.c
+P2 := bosses.c game.c level.c monsters.c resource.c screen.c sound.c staticres.c unpack.c
+
+BB_SRCS := $(foreach f,$(BB),bb/$f)
+JA_SRCS := $(foreach f,$(JA),ja/$f)
+P2_SRCS := $(foreach f,$(P2),p2/$f)
+SRCS := $(BB_SRCS) $(JA_SRCS) $(P2_SRCS)
+OBJS := $(SRCS:.c=.o)
+DEPS := $(SRCS:.c=.d)
+
+CPPFLAGS += -O2 -Wall -Wextra -Wno-unused-parameter -Wno-sign-compare -Wpedantic -MMD $(SDL_CFLAGS) -I. -g
+
+all: blues
+
+game_bb.o: CPPFLAGS += -fvisibility=hidden
+
+game_bb.o: $(BB_SRCS:.c=.o)
+	ld -r -o $@ $^
+	objcopy --localize-hidden $@
+
+game_ja.o: CPPFLAGS += -fvisibility=hidden
+
+game_ja.o: $(JA_SRCS:.c=.o)
+	ld -r -o $@ $^
+	objcopy --localize-hidden $@
+
+game_p2.o: CPPFLAGS += -fvisibility=hidden
+
+game_p2.o: $(P2_SRCS:.c=.o)
+	ld -r -o $@ $^
+	objcopy --localize-hidden $@
+
+blues: main.o mixer.o sys_sdl2.o util.o game_bb.o game_ja.o game_p2.o
+	$(CC) $(LDFLAGS) -o $@ $^ $(SDL_LIBS) $(MODPLUG_LIBS)
+
+clean:
+	rm -f $(OBJS) $(DEPS) *.o *.d
+
+-include $(DEPS)
+
+
+# prepare an archive for the program
+release:
+	@echo "Creating release files..."
+	@strip blues
+	@mkdir -p release/blues
+	@copy ALL release_files/ release/blues/ QUIET
+	@copy blues "release/blues/Blues Brothers/"
+	@copy blues "release/blues/Jukebox Adventure/"
+	@copy blues "release/blues/Prehistorik 2/"
+	@copy README.md release/blues/
+	@echo "Creating release archive..."
+	@lha -aeqr3 a blues.lha release/
+	@echo "Clean release files..."
+	@delete release ALL QUIET FORCE

bb/resource.c

@@ -1,4 +1,8 @@
 
+#if defined(__amigaos4__)
+#include <sys/unistd.h>
+#endif
+
 #include "resource.h"
 #include "sys.h"
 #include "unpack.h"

ja/level.c

@@ -113,7 +113,7 @@ static uint8_t level_lookup_tile(uint8_t num) {
 
 static uint8_t level_get_tile(int offset) {
 	if (offset < 0 || offset >= g_vars.tilemap_w * g_vars.tilemap_h) {
-		print_warning("Invalid tilemap offset %d", offset);
+		// print_warning("Invalid tilemap offset %d", offset);
 		return 0;
 	}
 	int num = g_vars.tilemap_data[offset];
@@ -2434,7 +2434,7 @@ static void level_tile_func_5f16(struct object_t *obj, int bp) {
 		level_tile_func_5e83(obj, bp);
 	} else {
 		if (obj != &g_vars.players_table[0].obj) {
-			print_warning("Unexpected object #%d spr %d on tile 5f16", obj - g_vars.objects_table, obj->spr_num);
+			// print_warning("Unexpected object #%d spr %d on tile 5f16", obj - g_vars.objects_table, obj->spr_num);
 			return;
 		}
 		player_flags2(obj) &= ~2;

ja/resource.c

@@ -1,4 +1,8 @@
 
+#if defined(__amigaos4__)
+#include <sys/unistd.h>
+#endif
+
 #include <sys/param.h>
 #include "resource.h"
 #include "unpack.h"

main.c

@@ -7,7 +7,17 @@
 
 struct options_t g_options;
 
+#if defined(__amigaos4__)
+#define USED __attribute__((used))
+#define VSTRING     "Blues 1.0.0r1 (04.08.2023)"
+#define VERSTAG     "\0$VER: " VSTRING
+static const char *stack USED = "$STACK:102400";
+static const char *version USED = VERSTAG;
+
+static const char *DEFAULT_DATA_PATH = "PROGDIR:data";
+#else
 static const char *DEFAULT_DATA_PATH = ".";
+#endif
 
 static const int DEFAULT_SCALE_FACTOR = 2;
 

release_files/Blues Brothers/Blues Brothers

@@ -0,0 +1 @@
+Run >NIL: blues --scale=3

release_files/Jukebox Adventure/Jukebox Adventure

@@ -0,0 +1 @@
+Run >NIL: blues --scale=3

release_files/Prehistorik 2/Prehistorik 2

@@ -0,0 +1 @@
+Run >NIL: blues --scale=3

release_files/README_Amiga.md

@@ -0,0 +1,94 @@
+# blues for AmigaOS 4.1 FE
+
+blues is a game engine developed by Gregory Montoir and found at his
+GitHub repository (https://github.com/cyxx/blues)
+
+This engine supports three games developed by Titus Interactive,
+which are the "Blues Brothers", the "Blues Brothers: Jukebox Adventure"
+and the "Prehistorik 2"
+
+## Installation
+
+Extract the archive wherever you want. There are three folders, one
+for each game. In these folders there is the executable and a *data*
+folder where you need to copy the data files for each game.
+Please read below for more info about these files.
+
+### Blues Brothers
+
+The data files of the Amiga or DOS version, full game or
+demo (https://archive.org/details/TheBluesBrothers_1020), are
+required.
+
+```
+*.BIN, *.CK1, *.CK2, *.SQL, *.SQV, *.SQZ
+```
+
+For sounds and music, the Amiga version files or the
+ExoticA (https://www.exotica.org.uk/wiki/The_Blues_Brothers) set
+need to be copied.
+
+### Jukebox Adventure
+
+The data files of the DOS version are required.
+
+```
+*.EAT, *.MOD
+```
+
+### Prehistorik 2
+
+The data files of the DOS version, full game or
+demo (http://cd.textfiles.com/ccbcurrsh1/demos/pre2.zip), are
+required.
+
+```
+*.SQZ, *.TRK
+```
+
+## Usage
+
+```
+Usage: blues [OPTIONS]...
+  --datapath=PATH   Path to data files (default '.')
+  --level=NUM       Start at level NUM
+  --cheats=MASK     Cheats bitmask
+  --startpos=XxY    Start at position (X,Y)
+  --fullscreen      Enable fullscreen
+  --scale=N         Graphics scaling factor (default 2)
+  --filter=NAME     Graphics scaling filter (default 'nearest')
+  --screensize=WxH  Graphics screen size (default 320x200)
+  --cga             Enable CGA colors
+  --dosscroll       Enable DOS style screen scrolling
+  --hybrid          Enable fuchsia color as in Hybrid crack
+```
+
+## I would like to thank
+
+- Gregory Montoir for creating this awesome engine and open sourcing it
+- Capehill for his tireless work on SDL port for AmigaOS 4.1 FE
+
+## Support
+
+If you enjoy what I am doing and would like to keep me up during the night,
+please consider to buy me a coffee at:
+https://ko-fi.com/walkero
+
+## Known issues
+
+- Please avoid using the fullscreen because some times it breaks
+  the game in some situations. Prefer to use --scale
+- By default the game loads the data files from the data folder.
+  It is not tested if those are in a different place and it might fail
+- If you have problems in graphics (black screen, missing sprites)
+  try different SDL renderer in prefs
+
+You can find the known issues at
+https://git.walkero.gr/walkero/blues
+
+# Changelog
+
+## [1.0.0r1] - 2023-08-04
+### Added
+- First release for AmigaOS 4
+

sys_sdl2.c

@@ -119,7 +119,7 @@ static void sdl2_set_screen_size(int w, int h, const char *caption, int scale, c
 	}
 	const int window_w = w * scale;
 	const int window_h = h * scale;
-	const int flags = fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;
+	const int flags = fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_SHOWN;
 	_window = SDL_CreateWindow(caption, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, window_w, window_h, flags);
 	_renderer = SDL_CreateRenderer(_window, -1, 0);
 	SDL_RenderSetLogicalSize(_renderer, w, h);
@@ -647,7 +647,11 @@ static void sdl2_start_audio(sys_audio_cb callback, void *param) {
 	SDL_AudioSpec desired;
 	memset(&desired, 0, sizeof(desired));
 	desired.freq = SYS_AUDIO_FREQ;
+#if defined(__amigaos4__)
+	desired.format = AUDIO_S16SYS;
+#else
 	desired.format = AUDIO_S16;
+#endif
 	desired.channels = 1;
 	desired.samples = 2048;
 	desired.callback = callback;