mirror of
https://github.com/polpo/picogus.git
synced 2026-10-25 21:40:16 +00:00
147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
|
|
Title : SoundBlaster DSP Emulation Header
|
|
Date : 2023-12-30
|
|
Author : Kevin Moonlight <me@yyzkevin.com>
|
|
|
|
Copyright (C) 2023 Kevin Moonlight
|
|
Copyright (C) 2024 Ian Scott
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
|
|
SPDX-License-Identifier: MIT
|
|
*/
|
|
|
|
#ifndef SBDSP_H
|
|
#define SBDSP_H
|
|
|
|
#include <inttypes.h>
|
|
#include <stdbool.h>
|
|
|
|
typedef struct sbdsp_t {
|
|
uint8_t inbox;
|
|
uint8_t outbox;
|
|
uint8_t test_register;
|
|
uint8_t current_command;
|
|
uint8_t current_command_index;
|
|
|
|
uint8_t mixer_command;
|
|
|
|
uint16_t dma_interval;
|
|
|
|
uint16_t dac_pause_duration;
|
|
uint8_t dac_pause_duration_low;
|
|
|
|
uint16_t dma_block_size;
|
|
uint32_t dma_bytes_per_frame;
|
|
uint16_t dma_sample_count;
|
|
uint32_t dma_xfer_count;
|
|
uint32_t dma_xfer_count_left;
|
|
|
|
uint8_t time_constant;
|
|
uint16_t sample_rate;
|
|
|
|
bool autoinit;
|
|
bool dma_enabled;
|
|
bool dma_16bit;
|
|
bool dma_stereo;
|
|
bool dma_stereo_sbpro;
|
|
bool dma_signed;
|
|
volatile bool dma_done;
|
|
|
|
bool speaker_on;
|
|
|
|
volatile bool dav_pc;
|
|
volatile bool dav_dsp;
|
|
volatile bool dsp_busy;
|
|
bool dac_resume_pending;
|
|
volatile bool irq_8_pending;
|
|
volatile bool irq_16_pending;
|
|
uint8_t reset_state;
|
|
|
|
union {
|
|
struct { uint8_t minor, major; };
|
|
uint16_t w;
|
|
} dsp_version;
|
|
|
|
union {
|
|
uint8_t irq;
|
|
uint8_t dma;
|
|
} resources;
|
|
|
|
union {
|
|
struct {
|
|
uint8_t fixTC : 1;
|
|
uint8_t lockMixer : 2;
|
|
};
|
|
uint8_t b;
|
|
} options;
|
|
|
|
volatile uint32_t cur_sample; // packed stereo pair: L in low 16, R in high 16
|
|
#if 0
|
|
struct {
|
|
uint32_t old_sample;
|
|
uint32_t new_sample;
|
|
volatile uint32_t dma_sample;
|
|
volatile bool dma_sample_ready;
|
|
bool dma_pending; // a DMA transfer is in flight
|
|
int32_t samplecnt;
|
|
} rsm; // resampling state, memset to zero on start/stop
|
|
#else
|
|
struct {
|
|
int32_t phase_acc;
|
|
uint32_t buf[2]; // sample buffer, used for linear interpolation
|
|
|
|
// DMA stuff
|
|
// TODO: make it a very short (max. 8 samples) ring buffer for Creative ADPCM
|
|
// and rates slightly higher than 44100Hz (SB16 cap is 45454Hz)
|
|
} rs;
|
|
struct {
|
|
volatile uint32_t dma_sample;
|
|
volatile bool dma_sample_ready;
|
|
bool dma_pending; // a DMA transfer is in flight
|
|
} rsm;
|
|
#endif
|
|
|
|
int32_t rateratio;
|
|
} sbdsp_t;
|
|
|
|
void sbdsp_init();
|
|
void sbdsp_process();
|
|
void sbdsp_write(uint8_t address, uint8_t value);
|
|
uint8_t sbdsp_read(uint8_t address);
|
|
uint16_t sbdsp_sample_rate();
|
|
int16_t sbdsp_muted();
|
|
|
|
uint32_t sbdsp_generate_sample();
|
|
static inline uint32_t sbdsp_sample_stereo() {
|
|
extern sbdsp_t sbdsp;
|
|
if (sbdsp.dma_enabled && !sbdsp.dac_resume_pending) sbdsp.cur_sample = sbdsp_generate_sample();
|
|
return sbdsp.speaker_on ? sbdsp.cur_sample : 0;
|
|
}
|
|
|
|
// -------------------------
|
|
// PicoGUS configuration interface helpers
|
|
|
|
void sbdsp_set_type(uint8_t type);
|
|
void sbdsp_set_irq(uint8_t irq);
|
|
void sbdsp_set_dma(uint8_t dma);
|
|
void sbdsp_set_options(uint8_t options);
|
|
|
|
#endif // SBDSP_H
|