Add Dreamcast support for DirkSimple, including platform-specific file handling and build scripts

Author: GPF

CMakeLists.txt

@@ -203,7 +203,9 @@ if(DIRKSIMPLE_SDL)
         set_target_properties(dirksimple PROPERTIES OUTPUT_NAME "dirksimple-wasm")
         set_target_properties(dirksimple PROPERTIES LINK_FLAGS "${IPO_FLAG} -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s ASSERTIONS=0 -s EXPORTED_RUNTIME_METHODS=['addRunDependency','removeRunDependency'] -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=['$autoResumeAudioContext','$dynCall']")
     endif()
-
+    if(CMAKE_SYSTEM_NAME STREQUAL "Dreamcast")
+        target_link_libraries(dirksimple GL)
+    endif()
     # This is safe to set on all platforms. Otherwise your SDL app will have a terminal window pop up with it on Windows.
     set_property(TARGET dirksimple PROPERTY WIN32_EXECUTABLE TRUE)
 

dc.sh

@@ -0,0 +1,2 @@
+mkdcdisc -n DCDirkSimple -N  -d data -e dirksimple.elf  -o dirksimple.cdi
+

dirksimple.c

@@ -1289,10 +1289,18 @@ static void setup_movie(const char *gamepath, DirkSimple_PixFmt pixfmt)
 
     DirkSimple_Io *io = DirkSimple_openfile_read(gamepath);
     if (!io) {
+#ifndef __DREAMCAST__        
+        const size_t slen = 33;
+#else
         const size_t slen = strlen(gamepath) + 5;
+#endif        
         char *gamepath_ext = DirkSimple_xmalloc(slen);
         if (gamepath_ext) {
+#ifndef __DREAMCAST__
             snprintf(gamepath_ext, slen, "%s.ogv", gamepath);
+#else
+            snprintf(gamepath_ext, slen, "/cd/data/games/lair/lair.ogv");
+#endif            
             io = DirkSimple_openfile_read(gamepath_ext);
             DirkSimple_free(gamepath_ext);
         }

dirksimple_sdl.c

@@ -187,9 +187,9 @@ void DirkSimple_videoformat(const char *gametitle, uint32_t width, uint32_t heig
     if (!GWindow) {
         sdlpanic("Failed to create window");
     }
-
+#ifndef __DREAMCAST__    
     load_icon(GWindow);
-
+#endif
     GRenderer = SDL_CreateRenderer(GWindow, NULL);
     if (!GRenderer) {
         sdlpanic("Failed to create renderer");
@@ -283,7 +283,11 @@ void DirkSimple_drawsprite(DirkSimple_Sprite *sprite, int sx, int sy, int sw, in
     }
 
     if (texture == NULL) {
+#ifdef __DREAMCAST__        
+        texture = SDL_CreateTexture(GRenderer, SDL_PIXELFORMAT_ARGB1555, SDL_TEXTUREACCESS_STATIC, sprite->width, sprite->height);
+#else
         texture = SDL_CreateTexture(GRenderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STATIC, sprite->width, sprite->height);
+#endif        
         if (!texture) {
             char what[128];
             SDL_snprintf(what, sizeof (what), "Failed to create texture for sprite '%s'", sprite->name);
@@ -538,6 +542,12 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
 
 #ifdef DIRKSIMPLE_FORCE_BASE_DIR  // let Linux distros hardcode this to something under /usr/share, or whatever.
     basedir = DIRKSIMPLE_FORCE_BASE_DIR;
+#ifdef __DREAMCAST__
+    gamepath = strdup("data/games/lair"); // Relative to basedir
+    gamename = strdup("lair");
+    GWantFullscreen = true;
+
+#endif    
 #else
     basedir = SDL_GetBasePath();
 #endif
@@ -548,7 +558,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Failed to determine base dir", errstr, NULL);  // in case this works.
         return SDL_APP_FAILURE;
     }
-
+#ifndef __DREAMCAST__
     for (i = 1; i < argc; i++) {
         const char *arg = argv[i];
         if (*arg == '-') {
@@ -576,13 +586,12 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         SDL_EnumerateDirectory(basedir, find_movie_files, &foundpath);
         gamepath = foundpath;
     }
-
+#endif
     if (!gamepath) {
         SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Can't find a movie file!", "Include an .ogv file with the build or put it on the command line.", NULL);
         SDL_Quit();
         return SDL_APP_FAILURE;
     }
-
     DirkSimple_startup(basedir, gamepath, gamename, DIRKSIMPLE_PIXFMT_IYUV);
 
     SDL_free(foundpath);

dreamcast.sh

@@ -0,0 +1 @@
+kos-cmake -S . -B build -DDIRKSIMPLE_LIBRETRO=OFF -DDIRKSIMPLE_FORCE_BASE_DIR=\"/cd/\" -DSDL3_DIR=/opt/toolchains/dc/kos/addons/lib/dreamcast/cmake/SDL3

thirdparty/lua/src/ldo.c

@@ -60,7 +60,7 @@
 	try { a } catch(...) { if ((c)->status == 0) (c)->status = -1; }
 #define luai_jmpbuf		int  /* dummy variable */
 
-#elif defined(LUA_USE_POSIX)				/* }{ */
+#elif defined(LUA_USE_POSIX) && !defined(__DREAMCAST__)				/* }{ */
 
 /* in POSIX, try _longjmp/_setjmp (more efficient) */
 #define LUAI_THROW(L,c)		_longjmp((c)->b, 1)