mirror of https://github.com/bsnes-emu/bsnes.git
Printer API, compression not supported yet
This commit is contained in:
Lior Halphon
parent
cd382ef236
commit
527ae01e0e
|
|
@ -543,3 +543,12 @@ void GB_set_sample_rate(GB_gameboy_t *gb, unsigned int sample_rate)
|
|||
gb->sample_rate = sample_rate;
|
||||
gb->audio_position = 0;
|
||||
}
|
||||
|
||||
void GB_disconnect_serial(GB_gameboy_t *gb)
|
||||
{
|
||||
gb->serial_transfer_start_callback = NULL;
|
||||
gb->serial_transfer_end_callback = NULL;
|
||||
|
||||
/* Reset any internally-emulated device. Currently, only the printer. */
|
||||
memset(&gb->printer, 0, sizeof(gb->printer));
|
||||
}
|
||||
|
|
@ -4,6 +4,7 @@
|
|||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <time.h>
|
||||
#include "printer.h"
|
||||
#include "apu.h"
|
||||
#include "save_struct.h"
|
||||
#include "symbol_hash.h"
|
||||
|
|
@ -264,9 +265,9 @@ typedef struct GB_gameboy_s {
|
|||
bool ime_toggle; /* ei (and di in CGB) have delayed effects.*/
|
||||
bool halt_bug;
|
||||
|
||||
/* Misc state*/
|
||||
/* IR */
|
||||
/* Misc state */
|
||||
bool infrared_input;
|
||||
GB_printer_t printer;
|
||||
);
|
||||
|
||||
/* DMA and HDMA */
|
||||
|
|
@ -510,4 +511,5 @@ void GB_set_serial_transfer_end_callback(GB_gameboy_t *gb, GB_serial_transfer_en
|
|||
uint8_t GB_serial_get_data(GB_gameboy_t *gb);
|
||||
void GB_serial_set_data(GB_gameboy_t *gb, uint8_t data);
|
||||
|
||||
void GB_disconnect_serial(GB_gameboy_t *gb);
|
||||
#endif /* GB_h */
|
||||
|
|
|
|||
|
|
@ -0,0 +1,179 @@
|
|||
#include "gb.h"
|
||||
|
||||
/* TODO: Emulation is VERY basic and assumes the ROM correctly uses the printer's interface.
|
||||
Incorrect usage is not correctly emulated, as it's not well documented, nor do I
|
||||
have my own GB Printer to figure it out myself.
|
||||
|
||||
It also does not currently emulate communication timeout, which means that a bug
|
||||
might prevent the printer operation until the GameBoy is restarted.
|
||||
|
||||
Also, field mask values are assumed. */
|
||||
|
||||
static void handle_command(GB_gameboy_t *gb)
|
||||
{
|
||||
|
||||
switch (gb->printer.command_id) {
|
||||
case GB_PRINTER_INIT_COMMAND:
|
||||
gb->printer.status = 0;
|
||||
gb->printer.image_offset = 0;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_START_COMMAND:
|
||||
if (gb->printer.command_length == 4) {
|
||||
gb->printer.status = 6; /* Printing */
|
||||
uint32_t image[gb->printer.image_offset];
|
||||
uint8_t palette = gb->printer.command_data[2];
|
||||
uint32_t colors[4] = {gb->rgb_encode_callback(gb, 0xff, 0xff, 0xff),
|
||||
gb->rgb_encode_callback(gb, 0xaa, 0xaa, 0xaa),
|
||||
gb->rgb_encode_callback(gb, 0x55, 0x55, 0x55),
|
||||
gb->rgb_encode_callback(gb, 0x00, 0x00, 0x00)};
|
||||
for (unsigned i = 0; i < gb->printer.image_offset; i++) {
|
||||
image[i] = colors[(palette >> (gb->printer.image[i] * 2)) & 3];
|
||||
}
|
||||
|
||||
if (gb->printer.callback) {
|
||||
gb->printer.callback(gb, image, gb->printer.image_offset / 160,
|
||||
gb->printer.command_data[1] >> 4, gb->printer.command_data[1] & 7,
|
||||
gb->printer.command_data[3] & 0x7F);
|
||||
}
|
||||
|
||||
gb->printer.image_offset = 0;
|
||||
}
|
||||
break;
|
||||
|
||||
case GB_PRINTER_DATA_COMMAND:
|
||||
if (gb->printer.command_length == GB_PRINTER_DATA_SIZE) {
|
||||
gb->printer.image_offset %= sizeof(gb->printer.image);
|
||||
gb->printer.status = 8; /* Received 0x280 bytes */
|
||||
|
||||
uint8_t *byte = gb->printer.command_data;
|
||||
|
||||
for (unsigned row = 2; row--; ) {
|
||||
for (unsigned tile_x = 0; tile_x < 160 / 8; tile_x++) {
|
||||
for (unsigned y = 0; y < 8; y++, byte += 2) {
|
||||
for (unsigned x_pixel = 0; x_pixel < 8; x_pixel++) {
|
||||
gb->printer.image[gb->printer.image_offset + tile_x * 8 + x_pixel + y * 160] =
|
||||
((*byte) >> 7) | (((*(byte + 1)) >> 7) << 1);
|
||||
(*byte) <<= 1;
|
||||
(*(byte + 1)) <<= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
gb->printer.image_offset += 8 * 160;
|
||||
}
|
||||
}
|
||||
|
||||
case GB_PRINTER_NOP_COMMAND:
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static void serial_start(GB_gameboy_t *gb, uint8_t byte_received)
|
||||
{
|
||||
gb->printer.byte_to_send = 0;
|
||||
switch (gb->printer.command_state) {
|
||||
case GB_PRINTER_COMMAND_MAGIC1:
|
||||
if (byte_received != 0x88) {
|
||||
return;
|
||||
}
|
||||
gb->printer.status &= ~1;
|
||||
gb->printer.command_length = 0;
|
||||
gb->printer.checksum = 0;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_MAGIC2:
|
||||
if (byte_received != 0x33) {
|
||||
if (byte_received != 0x88) {
|
||||
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
|
||||
}
|
||||
return;
|
||||
}
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_ID:
|
||||
gb->printer.command_id = byte_received & 0xF;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_COMPRESSION:
|
||||
gb->printer.compression = byte_received & 1;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_LENGTH_LOW:
|
||||
gb->printer.length_left = byte_received;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_LENGTH_HIGH:
|
||||
gb->printer.length_left |= (byte_received & 3) << 8;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_DATA:
|
||||
if (gb->printer.command_length != GB_PRINTER_MAX_COMMAND_LENGTH) {
|
||||
gb->printer.command_data[gb->printer.command_length++] = byte_received;
|
||||
}
|
||||
gb->printer.length_left--;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_CHECKSUM_LOW:
|
||||
gb->printer.checksum ^= byte_received;
|
||||
break;
|
||||
|
||||
case GB_PRINTER_COMMAND_CHECKSUM_HIGH:
|
||||
gb->printer.checksum ^= byte_received << 8;
|
||||
if (gb->printer.checksum) {
|
||||
gb->printer.status |= 1; /* Checksum error*/
|
||||
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
|
||||
return;
|
||||
}
|
||||
break;
|
||||
case GB_PRINTER_COMMAND_ACTIVE:
|
||||
gb->printer.byte_to_send = 0x81;
|
||||
break;
|
||||
case GB_PRINTER_COMMAND_STATUS:
|
||||
|
||||
if ((gb->printer.command_id & 0xF) == GB_PRINTER_INIT_COMMAND) {
|
||||
/* Games expect INIT commands to return 0? */
|
||||
gb->printer.byte_to_send = 0;
|
||||
}
|
||||
else {
|
||||
gb->printer.byte_to_send = gb->printer.status;
|
||||
}
|
||||
|
||||
/* Printing is done instantly, but let the game recieve a 6 (Printing) status at least once, for compatibility */
|
||||
if (gb->printer.status == 6) {
|
||||
gb->printer.status = 4; /* Done */
|
||||
}
|
||||
|
||||
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
|
||||
handle_command(gb);
|
||||
return;
|
||||
}
|
||||
|
||||
if (gb->printer.command_state >= GB_PRINTER_COMMAND_ID && gb->printer.command_state < GB_PRINTER_COMMAND_CHECKSUM_LOW) {
|
||||
gb->printer.checksum += byte_received;
|
||||
}
|
||||
|
||||
if (gb->printer.command_state != GB_PRINTER_COMMAND_DATA) {
|
||||
gb->printer.command_state++;
|
||||
}
|
||||
|
||||
if (gb->printer.command_state == GB_PRINTER_COMMAND_DATA) {
|
||||
if (gb->printer.length_left == 0) {
|
||||
gb->printer.command_state++;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static uint8_t serial_end(GB_gameboy_t *gb)
|
||||
{
|
||||
return gb->printer.byte_to_send;
|
||||
}
|
||||
|
||||
void GB_connect_printer(GB_gameboy_t *gb, GB_print_image_callback_t callback)
|
||||
{
|
||||
GB_set_serial_transfer_start_callback(gb, serial_start);
|
||||
GB_set_serial_transfer_end_callback(gb, serial_end);
|
||||
gb->printer.callback = callback;
|
||||
}
|
||||
|
|
@ -0,0 +1,60 @@
|
|||
#ifndef printer_h
|
||||
#define printer_h
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
#define GB_PRINTER_MAX_COMMAND_LENGTH 0x280
|
||||
#define GB_PRINTER_DATA_SIZE 0x280
|
||||
|
||||
typedef struct GB_gameboy_s GB_gameboy_t;
|
||||
|
||||
typedef void (*GB_print_image_callback_t)(GB_gameboy_t *gb,
|
||||
uint32_t *image,
|
||||
uint8_t height,
|
||||
uint8_t top_margin,
|
||||
uint8_t bottom_margin,
|
||||
uint8_t exposure);
|
||||
|
||||
|
||||
typedef struct
|
||||
{
|
||||
/* Communication state machine */
|
||||
|
||||
enum {
|
||||
GB_PRINTER_COMMAND_MAGIC1,
|
||||
GB_PRINTER_COMMAND_MAGIC2,
|
||||
GB_PRINTER_COMMAND_ID,
|
||||
GB_PRINTER_COMMAND_COMPRESSION,
|
||||
GB_PRINTER_COMMAND_LENGTH_LOW,
|
||||
GB_PRINTER_COMMAND_LENGTH_HIGH,
|
||||
GB_PRINTER_COMMAND_DATA,
|
||||
GB_PRINTER_COMMAND_CHECKSUM_LOW,
|
||||
GB_PRINTER_COMMAND_CHECKSUM_HIGH,
|
||||
GB_PRINTER_COMMAND_ACTIVE,
|
||||
GB_PRINTER_COMMAND_STATUS,
|
||||
} command_state : 8;
|
||||
enum {
|
||||
GB_PRINTER_INIT_COMMAND = 1,
|
||||
GB_PRINTER_START_COMMAND = 2,
|
||||
GB_PRINTER_DATA_COMMAND = 4,
|
||||
GB_PRINTER_NOP_COMMAND = 0xF,
|
||||
} command_id : 8;
|
||||
bool compression;
|
||||
uint16_t length_left;
|
||||
uint8_t command_data[GB_PRINTER_MAX_COMMAND_LENGTH];
|
||||
uint16_t command_length;
|
||||
uint16_t checksum;
|
||||
uint8_t status;
|
||||
uint8_t byte_to_send;
|
||||
|
||||
uint8_t image[160 * 200];
|
||||
uint16_t image_offset;
|
||||
|
||||
GB_print_image_callback_t callback;
|
||||
} GB_printer_t;
|
||||
|
||||
|
||||
typedef struct GB_gameboy_s GB_gameboy_t;
|
||||
|
||||
void GB_connect_printer(GB_gameboy_t *gb, GB_print_image_callback_t callback);
|
||||
#endif
|
||||
Loading…
Reference in New Issue