Exported libsdl3game from the sdl3-gametest demo project

src/assets.c

@@ -0,0 +1,53 @@
+#include <SDL3/SDL.h>
+#include <SDL3_image/SDL_image.h>
+#include <SDL3_mixer/SDL_mixer.h>
+#include <sdlerror.h>
+#include "game.h"
+#include "staticstring.h"
+#include "heap.h"
+
+ErrorContext *load_start_bgm(char *fname)
+{
+  PREPARE_ERROR(errctx);
+  string *tmpstr = NULL;
+  MIX_Track *bgmtrack = NULL;
+  SDL_PropertiesID bgmprops = 0;
+
+  ATTEMPT {
+    FAIL_ZERO_BREAK(errctx, fname, ERR_NULLPOINTER, "load_start_bgm received NULL filename");
+    CATCH(errctx, heap_next_string(&tmpstr));
+    CATCH(errctx, string_initialize(tmpstr, NULL));
+  
+    SDL_snprintf((char *)&tmpstr->data, MAX_STRING_LENGTH, "%s%s", SDL_GetBasePath(), fname);
+    SDL_Log("Loading music asset from %s", (char *)&tmpstr->data);
+    bgm = MIX_LoadAudio(GAME_mixer, (char *)&tmpstr->data, true);
+    FAIL_ZERO_BREAK(errctx, bgm, ERR_NULLPOINTER, "Failed to load music asset %s : %s", (char *)&tmpstr->data, SDL_GetError());
+
+    bgmtrack = MIX_CreateTrack(GAME_mixer);
+    FAIL_ZERO_BREAK(errctx, bgmtrack, ERR_NULLPOINTER, "Failed to create audio track for background music: %s", SDL_GetError());
+
+    GAME_tracks[GAME_AUDIO_TRACK_BGM] = bgmtrack;
+    
+    FAIL_ZERO_BREAK(
+	errctx,
+	MIX_SetTrackAudio(bgmtrack, bgm),
+	ERR_SDL,
+	"%s",
+	SDL_GetError());
+
+    SDL_SetNumberProperty(bgmprops, MIX_PROP_PLAY_LOOPS_NUMBER, -1);
+    
+    if (!MIX_PlayTrack(bgmtrack, bgmprops)) {
+      FAIL_BREAK(errctx, ERR_SDL, "Failed to play music asset %s", fname);
+    }
+  } CLEANUP {
+    IGNORE(heap_release_string(tmpstr));
+    if ( errctx != NULL ) {
+      if ( errctx->status != 0 && bgm != NULL) {
+	MIX_DestroyAudio(bgm);
+      }
+    }
+  } PROCESS(errctx) {
+  } FINISH(errctx, true);
+  SUCCEED_RETURN(errctx);
+}