C++ ALLEGRO_ERROR函數代碼示例

/* Function: al_init_native_dialog_addon
 */
bool al_init_native_dialog_addon(void)
{
   if (!inited_addon) {
      if (!_al_init_native_dialog_addon()) {
         ALLEGRO_ERROR("_al_init_native_dialog_addon failed.\n");
         return false;
      }
      inited_addon = true;
      _al_add_exit_func(al_shutdown_native_dialog_addon,
         "al_shutdown_native_dialog_addon");
   }
   return true;
}

static bool do_play_sample(ALLEGRO_SAMPLE_INSTANCE *splinst,
   ALLEGRO_SAMPLE *spl, float gain, float pan, float speed, ALLEGRO_PLAYMODE loop)
{
   if (!al_set_sample(splinst, spl)) {
      ALLEGRO_ERROR("al_set_sample failed\n");
      return false;
   }

   if (!al_set_sample_instance_gain(splinst, gain) ||
         !al_set_sample_instance_pan(splinst, pan) ||
         !al_set_sample_instance_speed(splinst, speed) ||
         !al_set_sample_instance_playmode(splinst, loop)) {
      return false;
   }

   if (!al_play_sample_instance(splinst)) {
      ALLEGRO_ERROR("al_play_sample_instance failed\n");
      return false;
   }

   return true;
}

static int get_pixel_formats_count_old(HDC dc)
{
   PIXELFORMATDESCRIPTOR pfd;
   int ret;

   ret = DescribePixelFormat(dc, 1, sizeof(pfd), &pfd);
   if (!ret) {
      ALLEGRO_ERROR("DescribePixelFormat failed! %s\n",
                     get_error_desc(GetLastError()));
   }

   return ret;
}

/* The open method starts up the driver and should lock the device, using the
   previously set parameters, or defaults. It shouldn't need to start sending
   audio data to the device yet, however. */
static int _dsound_open()
{
   HRESULT hr;
   ALLEGRO_INFO("Starting DirectSound...\n");

   /* FIXME: Use default device until we have device enumeration */
   hr = DirectSoundCreate8(NULL, &device, NULL);
   if (FAILED(hr)) {
      ALLEGRO_ERROR("DirectSoundCreate8 failed: %s\n", ds_get_error(hr));
      return 1;
   }

   ALLEGRO_DEBUG("DirectSoundCreate8 succeeded\n");

   hr = device->SetCooperativeLevel(get_window(), DSSCL_PRIORITY);
   if (FAILED(hr)) {
      ALLEGRO_ERROR("SetCooperativeLevel failed: %s\n", ds_get_error(hr));
      return 1;
   }

   return 0;
}

/* Create a new X11 display, which maps directly to a GLX window. */
static ALLEGRO_DISPLAY *xdpy_create_display(int w, int h)
{
   ALLEGRO_SYSTEM_XGLX *system = (ALLEGRO_SYSTEM_XGLX *)al_get_system_driver();
   ALLEGRO_DISPLAY_XGLX *display;
   int flags;
   int adapter;

   if (system->x11display == NULL) {
      ALLEGRO_WARN("Not connected to X server.\n");
      return NULL;
   }

   if (w <= 0 || h <= 0) {
      ALLEGRO_ERROR("Invalid window size %dx%d\n", w, h);
      return NULL;
   }

   flags = al_get_new_display_flags();
   if (flags & ALLEGRO_GTK_TOPLEVEL_INTERNAL) {
      if (gtk_override_vt == NULL) {
         ALLEGRO_ERROR("GTK requested but unavailable\n");
         return NULL;
      }
      if (flags & ALLEGRO_FULLSCREEN) {
         ALLEGRO_ERROR("GTK incompatible with fullscreen\n");
         return NULL;
      }
   }

   _al_mutex_lock(&system->lock);

   adapter = al_get_new_display_adapter();
   display = xdpy_create_display_locked(system, flags, w, h, adapter);

   _al_mutex_unlock(&system->lock);

   return (ALLEGRO_DISPLAY *)display;
}

/* The get_voice_position method should return the current sample position of
   the voice (sample_pos = byte_pos / (depth/8) / channels). This should never
   be called on a streaming voice. */
static unsigned int _dsound_get_voice_position(const ALLEGRO_VOICE *voice)
{
   ALLEGRO_DS_DATA *ex_data = (ALLEGRO_DS_DATA *)voice->extra;
   DWORD play_pos;
   HRESULT hr;

   hr = ex_data->ds8_buffer->GetCurrentPosition(&play_pos, NULL);
   if (FAILED(hr)) {
      ALLEGRO_ERROR("GetCurrentPosition failed\n");
      return 0;
   }

   return play_pos / (ex_data->channels / (ex_data->bits_per_sample/8));
}

static int get_pixel_formats_count_ext(HDC dc)
{
   int attrib[1];
   int value[1];

   attrib[0] = WGL_NUMBER_PIXEL_FORMATS_ARB;
   if ((_wglGetPixelFormatAttribivARB(dc, 0, 0, 1, attrib, value) == GL_FALSE)
    && (_wglGetPixelFormatAttribivEXT(dc, 0, 0, 1, attrib, value) == GL_FALSE)) {
        ALLEGRO_ERROR("WGL_ARB/EXT_pixel_format use failed! %s\n",
                       get_error_desc(GetLastError()));
   }

   return value[0];
}

/* Dummy implementation of flip. */
static void xdpy_flip_display(ALLEGRO_DISPLAY *d)
{
   int e = glGetError();
   if (e) {
      ALLEGRO_ERROR("OpenGL error was not 0: %d\n", e);
   }

   ALLEGRO_SYSTEM_XGLX *system = (ALLEGRO_SYSTEM_XGLX *)al_get_system_driver();
   ALLEGRO_DISPLAY_XGLX *glx = (ALLEGRO_DISPLAY_XGLX *)d;
   if (d->extra_settings.settings[ALLEGRO_SINGLE_BUFFER])
      glFlush();
   else
      glXSwapBuffers(system->gfxdisplay, glx->glxwindow);
}

/* Function: al_init_native_dialog_addon
 */
bool al_init_native_dialog_addon(void)
{
   if (!inited_addon) {
      if (!_al_init_native_dialog_addon()) {
         ALLEGRO_ERROR("_al_init_native_dialog_addon failed.\n");
         return false;
      }
      inited_addon = true;
      al_init_user_event_source(al_get_default_menu_event_source());
      _al_add_exit_func(al_shutdown_native_dialog_addon,
         "al_shutdown_native_dialog_addon");
   }
   return true;
}

static int oss_open(void)
{
   bool force_oss3 = false;
   ALLEGRO_CONFIG *config = al_get_system_config();
   if (config) {
      const char *force_oss3_cfg;
      force_oss3_cfg = al_get_config_value(config, "oss", "force_ver3");
      if (force_oss3_cfg && force_oss3_cfg[0] != '\0')
         force_oss3 = strcmp(force_oss3_cfg, "yes") ? false : true;
   }

   if (force_oss3) {
      ALLEGRO_WARN("Skipping OSS4 probe.\n");
   }

#ifdef OSS_VER_4
   bool inited = false;
   if (!force_oss3) {
      if (oss_open_ver4())
         ALLEGRO_WARN("OSS ver. 4 init failed, trying ver. 3...\n");
      else
         inited = true;
   }
   if (!inited && oss_open_ver3()) {
      ALLEGRO_ERROR("Failed to init OSS.\n");
      return 1;
   }
#else
   ALLEGRO_INFO("OSS4 support not compiled in. Skipping OSS4 probe.\n");
   if (oss_open_ver3()) {
      ALLEGRO_ERROR("Failed to init OSS.\n");
      return 1;
   }
#endif

   return 0;
}

/* Function: al_set_default_mixer
 */
bool al_set_default_mixer(ALLEGRO_MIXER *mixer)
{
   ASSERT(mixer != NULL);

   if (mixer != default_mixer) {
      int i;

      default_mixer = mixer;

      /* Destroy all current sample instances, recreate them, and
       * attach them to the new mixer */
      for (i = 0; i < (int) _al_vector_size(&auto_samples); i++) {
         ALLEGRO_SAMPLE_INSTANCE **slot = _al_vector_ref(&auto_samples, i);
         int *id = _al_vector_ref(&auto_sample_ids, i);

         *id = 0;
         al_destroy_sample_instance(*slot);

         *slot = al_create_sample_instance(NULL);
         if (!*slot) {
            ALLEGRO_ERROR("al_create_sample failed\n");
            goto Error;
         }
         if (!al_attach_sample_instance_to_mixer(*slot, default_mixer)) {
            ALLEGRO_ERROR("al_attach_mixer_to_sample failed\n");
            goto Error;
         }
      }      
   }

   return true;

Error:
   free_sample_vector();
   default_mixer = NULL;   
   return false;
}

/* The set_voice_position method should set the voice's playback position,
   given the value in samples. This should never be called on a streaming
   voice. */
static int _dsound_set_voice_position(ALLEGRO_VOICE *voice, unsigned int val)
{
   ALLEGRO_DS_DATA *ex_data = (ALLEGRO_DS_DATA *)voice->extra;
   HRESULT hr;

   val *= ex_data->channels * (ex_data->bits_per_sample/8);

   hr = ex_data->ds8_buffer->SetCurrentPosition(val);
   if (FAILED(hr)) {
      ALLEGRO_ERROR("SetCurrentPosition failed\n");
      return 1;
   }

   return 0;
}

/* _al_win_joystick_dinput_acquire: [window thread]
 *  Acquires the joystick devices.
 */
static void joystick_dinput_acquire(void)
{
   HRESULT hr;
   int i;

   if (!joystick_dinput)
      return;

   for (i=0; i < MAX_JOYSTICKS; i++) {
      if (joydx_joystick[i].device) {
         hr = IDirectInputDevice8_Acquire(joydx_joystick[i].device);

         if (FAILED(hr))
            ALLEGRO_ERROR("acquire joystick %d failed: %s\n", i, dinput_err_str(hr));
      }
   }
}

static bool glsl_build_shader(ALLEGRO_SHADER *shader)
{
   GLint status;
   ALLEGRO_SHADER_GLSL_S *gl_shader = (ALLEGRO_SHADER_GLSL_S *)shader;
   GLchar error_buf[4096];

   if (gl_shader->vertex_shader == 0 && gl_shader->pixel_shader == 0)
      return false;

   if (gl_shader->program_object != 0) {
      glDeleteProgram(gl_shader->program_object);
   }

   gl_shader->program_object = glCreateProgram();
   if (gl_shader->program_object == 0)
      return false;

   if (gl_shader->vertex_shader)
      glAttachShader(gl_shader->program_object, gl_shader->vertex_shader);
   if (gl_shader->pixel_shader)
      glAttachShader(gl_shader->program_object, gl_shader->pixel_shader);

   glLinkProgram(gl_shader->program_object);

   glGetProgramiv(gl_shader->program_object, GL_LINK_STATUS, &status);

   if (status == 0) {
      glGetProgramInfoLog(gl_shader->program_object, sizeof(error_buf), NULL,
         error_buf);
      if (shader->log) {
         al_ustr_truncate(shader->log, 0);
         al_ustr_append_cstr(shader->log, error_buf);
      }
      else {
         shader->log = al_ustr_new(error_buf);
      }
      ALLEGRO_ERROR("Link error: %s\n", error_buf);
      glDeleteProgram(gl_shader->program_object);
      return false;
   }

   /* Look up variable locations. */
   lookup_varlocs(&gl_shader->varlocs, gl_shader->program_object);

   return true;
}

static bool init_pixel_format_extensions(void)
{
   /* Load the ARB_p_f symbol - Note, we shouldn't use the extension
    * mechanism here, because it hasn't been initialized yet!
    */
   _wglGetPixelFormatAttribivARB =
      (_ALLEGRO_wglGetPixelFormatAttribivARB_t)wglGetProcAddress("wglGetPixelFormatAttribivARB");
   _wglGetPixelFormatAttribivEXT = 
      (_ALLEGRO_wglGetPixelFormatAttribivEXT_t)wglGetProcAddress("wglGetPixelFormatAttribivEXT");

   if (!_wglGetPixelFormatAttribivARB && !_wglGetPixelFormatAttribivEXT) {
      ALLEGRO_ERROR("WGL_ARB/EXT_pf not supported.\n");
      return false;
   }

   return true;
}