More small pieces of ESS emulation

Cacodemon345 · Mar 2, 2024 · a338d46 · a338d46
1 parent 8523a3e
commit a338d46
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Showing 2 changed files with 12 additions and 0 deletions.
diff --git a/src/include/86box/snd_sb_dsp.h b/src/include/86box/snd_sb_dsp.h
@@ -141,6 +141,7 @@ typedef struct sb_dsp_t {
     uint8_t azt_eeprom[AZTECH_EEPROM_SIZE]; /* the eeprom in the Aztech cards is attached to the DSP */
 
     uint8_t ess_regs[256]; /* ESS registers. */
+    uint8_t ess_playback_mode;
 
     mpu_t *mpu;
 } sb_dsp_t;

diff --git a/src/sound/snd_sb_dsp.c b/src/sound/snd_sb_dsp.c
@@ -1332,6 +1332,15 @@ sb_dsp_dma_attach(sb_dsp_t *dsp,
     dsp->dma_priv   = priv;
 }
 
+void
+sb_ess_finish_dma(sb_dsp_t *dsp)
+{
+    if (!dsp->ess_playback_mode)
+        return;
+    ESSreg(0xB8) &= ~0x01;
+    dma_set_drq(dsp->sb_8_dmanum, 0);
+}
+
 void
 pollsb(void *priv)
 {
@@ -1530,6 +1539,7 @@ pollsb(void *priv)
             else {
                 dsp->sb_8_enable = 0;
                 timer_disable(&dsp->output_timer);
+                sb_ess_finish_dma(dsp);
             }
             sb_irq(dsp, 1);
         }
@@ -1582,6 +1592,7 @@ pollsb(void *priv)
             else {
                 dsp->sb_16_enable = 0;
                 timer_disable(&dsp->output_timer);
+                sb_ess_finish_dma(dsp);
             }
             sb_irq(dsp, 0);
         }