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comparison ym2612.c @ 369:fc820ab1394b

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Fix left/right enable default value
author Mike Pavone <pavone@retrodev.com>
date Fri, 31 May 2013 21:30:11 -0700
parents 3ba3b6656fff
children 5f215603d001
comparison
equal deleted inserted replaced
368:c9d2a2371f5e 369:fc820ab1394b
92 context->buffer_inc = (double)sample_rate / (double)(clock_rate/OP_UPDATE_PERIOD); 92 context->buffer_inc = (double)sample_rate / (double)(clock_rate/OP_UPDATE_PERIOD);
93 context->sample_limit = sample_limit*2; 93 context->sample_limit = sample_limit*2;
94 for (int i = 0; i < NUM_OPERATORS; i++) { 94 for (int i = 0; i < NUM_OPERATORS; i++) {
95 context->operators[i].envelope = MAX_ENVELOPE; 95 context->operators[i].envelope = MAX_ENVELOPE;
96 context->operators[i].env_phase = PHASE_RELEASE; 96 context->operators[i].env_phase = PHASE_RELEASE;
97 }
98 //some games seem to expect that the LR flags start out as 1
99 for (int i = 0; i < NUM_CHANNELS; i++) {
100 context->channels[i].lr = 0xC0;
97 } 101 }
98 if (!did_tbl_init) { 102 if (!did_tbl_init) {
99 //populate sine table 103 //populate sine table
100 for (int32_t i = 0; i < 512; i++) { 104 for (int32_t i = 0; i < 512; i++) {
101 double sine = sin( ((double)(i*2+1) / SINE_TABLE_SIZE) * M_PI_2 ); 105 double sine = sin( ((double)(i*2+1) / SINE_TABLE_SIZE) * M_PI_2 );
476 break; 480 break;
477 } 481 }
478 case REG_DAC: 482 case REG_DAC:
479 if (context->dac_enable) { 483 if (context->dac_enable) {
480 context->channels[5].output = (((int16_t)value) - 0x80) << 6; 484 context->channels[5].output = (((int16_t)value) - 0x80) << 6;
481 //printf("DAC Write %X(%d)\n", context->channels[5].output, context->channels[5].output); 485 //printf("DAC Write %X(%d)\n", value, context->channels[5].output);
482 } 486 }
483 break; 487 break;
484 case REG_DAC_ENABLE: 488 case REG_DAC_ENABLE:
485 //printf("DAC Enable: %X\n", value); 489 //printf("DAC Enable: %X\n", value);
486 context->dac_enable = value & 0x80; 490 context->dac_enable = value & 0x80;
565 break; 569 break;
566 case REG_LR_AMS_PMS: 570 case REG_LR_AMS_PMS:
567 context->channels[channel].pms = value & 0x7; 571 context->channels[channel].pms = value & 0x7;
568 context->channels[channel].ams = value >> 4 & 0x3; 572 context->channels[channel].ams = value >> 4 & 0x3;
569 context->channels[channel].lr = value & 0xC0; 573 context->channels[channel].lr = value & 0xC0;
574 //printf("Write of %X to LR_AMS_PMS reg for channel %d\n", value, channel);
570 break; 575 break;
571 } 576 }
572 } 577 }
573 } 578 }
574 579
575 context->write_cycle = context->current_cycle; 580 context->write_cycle = context->current_cycle;
576 context->selected_reg = 0;//TODO: Verify this
577 } 581 }
578 582
579 uint8_t ym_read_status(ym2612_context * context) 583 uint8_t ym_read_status(ym2612_context * context)
580 { 584 {
581 return context->status; 585 return context->status;