Give OpenAL the ability to be optional

CMakeLists.txt

@@ -101,6 +101,7 @@ set(CMAKE_CXX_STANDARD 11)
 #      ------       -----------                                                     ----
 option(RELEASE      "Release build"                                                 OFF)
 option(DYNAREC      "Dynamic recompiler"                                            ON)
+option(OPENAL       "OpenAL"                                                        ON)
 option(FLUIDSYNTH   "FluidSynth"                                                    ON)
 option(MUNT         "MUNT"                                                          ON)
 option(VRAMDUMP     "Video RAM dumping"                                             OFF)

src/86box.c

@@ -932,7 +932,9 @@ pc_reset_hard_close(void)
 
 	scsi_disk_close();
 
+#ifdef USE_OPENAL
 	closeal();
+#endif
 
 	video_reset_close();
 

src/CMakeLists.txt

@@ -87,9 +87,11 @@ if(APPLE)
     target_link_libraries(86Box Freetype::Freetype)
 endif()
 
-find_package(OpenAL REQUIRED)
+if(OPENAL)
-include_directories(${OPENAL_INCLUDE_DIR})
+    find_package(OpenAL REQUIRED)
-target_link_libraries(86Box ${OPENAL_LIBRARY})
+    include_directories(${OPENAL_INCLUDE_DIR})
+    target_link_libraries(86Box ${OPENAL_LIBRARY})
+endif()
 
 find_package(SDL2 REQUIRED)
 include_directories(${SDL2_INCLUDE_DIRS})

src/sound/CMakeLists.txt

@@ -13,12 +13,17 @@
 #           Copyright 2020,2021 David Hrdlička.
 #
 
-add_library(snd OBJECT sound.c openal.c snd_opl.c snd_opl_nuked.c snd_resid.cc
+add_library(snd OBJECT sound.c snd_opl.c snd_opl_nuked.c snd_resid.cc
     midi.c midi_rtmidi.cpp snd_speaker.c snd_pssj.c snd_lpt_dac.c snd_ac97_codec.c snd_ac97_via.c
     snd_lpt_dss.c snd_adlib.c snd_adlibgold.c snd_ad1848.c snd_audiopci.c
     snd_azt2316a.c snd_cms.c snd_cs423x.c snd_gus.c snd_sb.c snd_sb_dsp.c
     snd_emu8k.c snd_mpu401.c snd_sn76489.c snd_ssi2001.c snd_wss.c snd_ym7128.c)
 
+if(OPENAL)
+    target_compile_definitions(snd PRIVATE USE_OPENAL)
+    target_sources(snd PRIVATE openal.c)
+endif()
+
 if(FLUIDSYNTH)
     target_compile_definitions(snd PRIVATE USE_FLUIDSYNTH)
     target_sources(snd PRIVATE midi_fluidsynth.c)

src/sound/midi_fluidsynth.c

@@ -40,8 +40,10 @@ enum fluid_interp {
 };
 
 
+#ifdef USE_OPENAL
 extern void givealbuffer_midi(void *buf, uint32_t size);
 extern void al_set_midi(int freq, int buf_size);
+#endif
 
 static void	*fluidsynth_handle;		/* handle to FluidSynth DLL */
 
@@ -150,7 +152,9 @@ static void fluidsynth_thread(void *param)
 			buf_pos += buf_size;
 			if (buf_pos >= data->buf_size)
 			{
+#ifdef USE_OPENAL
        		                givealbuffer_midi(data->buffer, data->buf_size / sizeof(float));
+#endif
 				buf_pos = 0;
 			}
 		}
@@ -163,7 +167,9 @@ static void fluidsynth_thread(void *param)
 			buf_pos += buf_size;
 			if (buf_pos >= data->buf_size)
 			{
+#ifdef USE_OPENAL
        		                givealbuffer_midi(data->buffer_int16, data->buf_size / sizeof(int16_t));
+#endif
 				buf_pos = 0;
 			}
 		}
@@ -314,7 +320,9 @@ void* fluidsynth_init(const device_t *info)
 		data->buffer_int16 = malloc(data->buf_size);
 	}
 
+#ifdef USE_OPENAL
         al_set_midi(data->samplerate, data->buf_size);
+#endif
 
         dev = malloc(sizeof(midi_device_t));
         memset(dev, 0, sizeof(midi_device_t));

src/sound/midi_mt32.c

@@ -13,8 +13,10 @@
 #include <86box/midi.h>
 
 
+#ifdef USE_OPENAL
 extern void givealbuffer_midi(void *buf, uint32_t size);
 extern void al_set_midi(int freq, int buf_size);
+#endif
 
 static const mt32emu_report_handler_i_v0 handler_v0 = {
         /** Returns the actual interface version ID */
@@ -136,7 +138,9 @@ static void mt32_thread(void *param)
 			buf_pos += bsize;
 			if (buf_pos >= buf_size)
 			{
+#ifdef USE_OPENAL
 				givealbuffer_midi(buffer, buf_size / sizeof(float));
+#endif
 				buf_pos = 0;
 			}
 		}
@@ -148,7 +152,9 @@ static void mt32_thread(void *param)
 			buf_pos += bsize;
 			if (buf_pos >= buf_size)
 			{
+#ifdef USE_OPENAL
 				givealbuffer_midi(buffer_int16, buf_size / sizeof(int16_t));
+#endif
 				buf_pos = 0;
 			}
 		}
@@ -200,7 +206,9 @@ void* mt32emu_init(char *control_rom, char *pcm_rom)
         mt32emu_set_reversed_stereo_enabled(context, device_get_config_int("reversed_stereo"));
         mt32emu_set_nice_amp_ramp_enabled(context, device_get_config_int("nice_ramp"));
 
+#ifdef USE_OPENAL
         al_set_midi(samplerate, buf_size);
+#endif
 
         dev = malloc(sizeof(midi_device_t));
         memset(dev, 0, sizeof(midi_device_t));

src/sound/sound.c

@@ -323,10 +323,12 @@ sound_cd_thread(void *param)
 		}
 	}
 
+#ifdef USE_OPENAL
 	if (sound_is_float)
 		givealbuffer_cd(cd_out_buffer);
 	else
 		givealbuffer_cd(cd_out_buffer_int16);
+#endif
     }
 }
 
@@ -430,10 +432,12 @@ sound_poll(void *priv)
 		}
 	}
 
+#ifdef USE_OPENAL
 	if (sound_is_float)
 		givealbuffer(outbuffer_ex);
 	else
 		givealbuffer(outbuffer_ex_int16);
+#endif
 
 	if (cd_thread_enable) {
                 cd_buf_update--;
@@ -462,7 +466,9 @@ sound_reset(void)
 
     midi_device_init();
     midi_in_device_init();
+#ifdef USE_OPENAL
     inital();
+#endif
 
     timer_add(&sound_poll_timer, sound_poll, NULL, 1);