ESFM update

src/sound/esfmu/esfm.c

@@ -2117,7 +2117,7 @@ ESFM_update_timers(esfm_chip *chip)
 	{
 		if (chip->timer_enable[i])
 		{
-			chip->timer_accumulator[i] += i == 0 ? TIMER1_CONST : TIMER2_CONST;
+			chip->timer_accumulator[i] += (i == 0) ? TIMER1_CONST : TIMER2_CONST;
 			if (chip->timer_accumulator[i] > 1.0)
 			{
 				chip->timer_accumulator[i] -= 1.0;
@@ -2126,6 +2126,7 @@ ESFM_update_timers(esfm_chip *chip)
 				{
 					if (chip->timer_mask[i] == 0)
 					{
+						chip->irq_bit = true;
 						chip->timer_overflow[i] = true;
 					}
 					chip->timer_counter[i] = chip->timer_reload[i];

src/sound/esfmu/esfm_registers.c

@@ -647,9 +647,11 @@ ESFM_write_reg_emu (esfm_chip *chip, uint16_t address, uint8_t data)
 				break;
 			case 0x02:
 				chip->timer_reload[0] = data;
+				chip->timer_counter[0] = data;
 				break;
 			case 0x03:
 				chip->timer_reload[1] = data;
+				chip->timer_counter[1] = data;
 				break;
 			case 0x04:
 				for (i = 0; i < 3; i++)
@@ -685,19 +687,24 @@ ESFM_write_reg_emu (esfm_chip *chip, uint16_t address, uint8_t data)
 				break;
 			case 0x02:
 				chip->timer_reload[0] = data;
+				chip->timer_counter[0] = data;
 				break;
 			case 0x03:
 				chip->timer_reload[1] = data;
+				chip->timer_counter[1] = data;
 				break;
 			case 0x04:
-				chip->timer_enable[0] = data & 0x01;
-				chip->timer_enable[1] = (data & 0x02) != 0;
-				chip->timer_mask[0] = (data & 0x20) != 0;
-				chip->timer_mask[1] = (data & 0x40) != 0;
 				if (data & 0x80)
 				{
 					chip->irq_bit = 0;
+					chip->timer_overflow[0] = 0;
+					chip->timer_overflow[1] = 0;
+					break;
 				}
+				chip->timer_enable[0] = data & 0x01;
+				chip->timer_enable[1] = (data & 0x02) != 0;
+				chip->timer_mask[1] = (data & 0x20) != 0;
+				chip->timer_mask[0] = (data & 0x40) != 0;
 				break;
 			case 0x08:
 				chip->keyscale_mode = (data & 0x40) != 0;

src/sound/snd_opl_esfm.c

@@ -54,44 +54,25 @@ typedef struct {
     uint16_t timer_count[2];
     uint16_t timer_cur_count[2];
 
-    // OPL3L
-    int32_t rateratio;
-    int32_t samplecnt;
-    int32_t oldsamples[2];
-    int32_t samples[2];
-
     int     pos;
     int32_t buffer[SOUNDBUFLEN * 2];
 } esfm_drv_t;
 
 void
-esfm_drv_generate_resampled(esfm_drv_t *dev, int32_t *bufp)
+esfm_generate_raw(esfm_drv_t *dev, int32_t *bufp)
 {
-    while (dev->samplecnt >= dev->rateratio) {
+    int16_t samples[2] = { 0, 0 };
-        int16_t samples[2] = { 0, 0 };
+    ESFM_generate(&dev->opl, samples);
-        dev->oldsamples[0] = dev->samples[0];
-        dev->oldsamples[1] = dev->samples[1];
-        ESFM_generate(&dev->opl, samples);
-        dev->samples[0] = samples[0];
-        dev->samples[1] = samples[1];
-        dev->samplecnt -= dev->rateratio;
-    }
 
-    bufp[0] = (int32_t) ((dev->oldsamples[0] * (dev->rateratio - dev->samplecnt)
+    bufp[0] = (int32_t) samples[0];
-                          + dev->samples[0] * dev->samplecnt)
+    bufp[1] = (int32_t) samples[1];
-                         / dev->rateratio);
-    bufp[1] = (int32_t) ((dev->oldsamples[1] * (dev->rateratio - dev->samplecnt)
-                          + dev->samples[1] * dev->samplecnt)
-                         / dev->rateratio);
-
-    dev->samplecnt += 1 << RSM_FRAC;
 }
 
 void
 esfm_drv_generate_stream(esfm_drv_t *dev, int32_t *sndptr, uint32_t num)
 {
     for (uint32_t i = 0; i < num; i++) {
-        esfm_drv_generate_resampled(dev, sndptr);
+        esfm_generate_raw(dev, sndptr);
         sndptr += 2;
     }
 }
@@ -115,7 +96,6 @@ esfm_drv_init(const device_t *info)
 
     /* Initialize the ESFMu object. */
     ESFM_init(&dev->opl);
-    dev->rateratio = (SOUND_FREQ << RSM_FRAC) / 49716;
 
     return dev;
 }