Add sound support

1 files changed, 116 insertions, 0 deletions

diff --git a/src/sound.c b/src/sound.c
new file mode 100644
index 0000000..f57c133
--- /dev/null
+++ b/src/sound.c
@@ -0,0 +1,116 @@
+#include <stdint.h>
+
+#include "data.h"
+
+#include "mikmod.h"
+
+typedef struct
+{
+    SAMPLE *s;
+    const char *data;
+    size_t len;
+} Efx;
+
+#define EFX_CNT 7
+
+static Efx efx[EFX_CNT] =
+{
+    { NULL, (const char *)binary_gold_efx_start, (size_t)&binary_gold_efx_size},
+    { NULL, (const char *)binary_jump_efx_start, (size_t)&binary_jump_efx_size},
+    { NULL, (const char *)binary_pickup_efx_start, (size_t)&binary_pickup_efx_size},
+    { NULL, (const char *)binary_warp_efx_start, (size_t)&binary_warp_efx_size},
+    { NULL, (const char *)binary_time_efx_start, (size_t)&binary_time_efx_size},
+    { NULL, (const char *)binary_hit_efx_start, (size_t)&binary_hit_efx_size},
+    { NULL, (const char *)binary_death_efx_start, (size_t)&binary_death_efx_size},
+};
+
+static uint8_t cur = 0;
+static uint32_t voice = 0;
+
+static MODULE *music = NULL;
+
+uint8_t sound_init()
+{
+    MikMod_RegisterAllDrivers();
+    MikMod_RegisterLoader(&load_it);
+
+    md_mode |= DMODE_SOFT_SNDFX | DMODE_SOFT_MUSIC;
+    md_volume = 128;
+    md_sndfxvolume = 128;
+    md_pansep = 0;
+    md_mixfreq = 22050;
+
+    if (MikMod_Init(NULL))
+        return 0;
+
+    for (uint8_t i = 0; i < EFX_CNT; i++)
+    {
+        efx[i].s = Sample_LoadMem(efx[i].data, efx[i].len);
+        if (!efx[i].s)
+            return 0;
+    }
+
+    /* 1 voice for effects */
+    MikMod_SetNumVoices(-1, 1);
+
+    /* needs a song playing to get effects; have a "silence" pattern on 0 */
+    music = Player_LoadMem((const char *)binary_music_start, (size_t)&binary_music_size, 8, 0);
+    if (!music)
+        return 0;
+
+    Player_Start(music);
+    MikMod_EnableOutput();
+
+    return 1;
+}
+
+volatile static uint8_t divider = 0;
+
+/* To be called from the timer int, so we update every 540ms approx by using a
+ * counter and updating 1 in 10 interrupts */
+void sound_update()
+{
+    if (++divider == 10)
+    {
+        divider = 0;
+        MikMod_Update();
+    }
+}
+
+void sound_mute()
+{
+    MikMod_DisableOutput();
+}
+
+void sound_unmute()
+{
+    MikMod_EnableOutput();
+}
+
+void sound_free()
+{
+    MikMod_DisableOutput();
+
+    if (music)
+        Player_Free(music);
+
+    for (uint8_t i = 0; i < EFX_CNT; i++)
+        if (!efx[i].s)
+            Sample_Free(efx[i].s);
+
+    MikMod_Exit();
+}
+
+void sound_music_pattern(uint16_t pat)
+{
+    Player_SetPosition(pat);
+}
+
+void sound_play_efx(uint8_t efxno)
+{
+    if (cur > efxno && !Voice_Stopped(voice))
+        return;
+
+    cur = efxno;
+    voice = Sample_Play(efx[cur].s, 0, 0);
+}