libakgl/src/assets.c

#include <SDL3/SDL.h>
#include <SDL3_image/SDL_image.h>
#include <SDL3_mixer/SDL_mixer.h>
#include <sdlerror.h>
#include <sdl3game/game.h>
#include <sdl3game/staticstring.h>
#include <sdl3game/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);
}