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main.c
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main.c
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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hw_md.h"
#include "cdfh.h"
#include "module.h"
#define MAX_ENTRIES 256
typedef struct
{
int offset;
int length;
char flags;
char name[247];
} entry_t;
entry_t gDirTable[MAX_ENTRIES];
short gCount = 0;
short gFirst = 0;
short gCurrent = 0;
short gFilter = 1;
short gStage = 0;
char *temp = (char *)0x0C0000;
static char *flt_strings[] = {
"running average ",
"sample and hold ",
"exponential dropoff",
};
static char *err_strings[] = {
"",
"couldn't load MOD header",
"unrecognized or wrong # channels",
"couldn't allocate pattern buffer",
"couldn't read pattern data"
};
//----------------------------------------------------------------------
int getCurrDir(void)
{
int r = 0;
int i = 0;
while (!r)
{
r = next_dir_entry();
if (!r && memcmp(global_vars->DENTRY_NAME, ".", 2))
{
gDirTable[i].offset = global_vars->DENTRY_OFFSET;
gDirTable[i].length = global_vars->DENTRY_LENGTH;
gDirTable[i].flags = global_vars->DENTRY_FLAGS >> 8;
strcpy(gDirTable[i].name, global_vars->DENTRY_NAME);
i++;
}
if (r == ERR_NO_MORE_ENTRIES)
r = next_dir_sec();
}
return i;
}
int main(void)
{
int i, j;
unsigned short buttons, changed, previous = 0;
Mod_t module;
CDFileHandle_t *handle;
strcpy(temp, "MOD Player");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_WHITE, 15, 1);
strcpy(temp, "Resample filter: ");
strcat(temp, flt_strings[gFilter]);
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 25);
init_cd(); // init CD
set_cwd("/"); // set current directory to root
gCount = getCurrDir();
gStage = 0;
while (1)
{
if (gStage == 0)
{
char *p = temp;
// update display with directory entries
memset(p, 0, 20*64*2);
if (gCount)
for (i = 0; i < 20; i++)
{
if ((gFirst + i) >= gCount)
break;
p = &temp[i*64*2 + 2]; // left justified
if (gDirTable[gFirst + i].flags & 2)
{
// directory
*p++ = ((gFirst + i) == gCurrent) ? TEXT_WHITE >> 8 : TEXT_GREEN >> 8;
*p++ = '[' - 0x20;
for (j = 0; j < 36; j++)
{
if (gDirTable[gFirst + i].name[j] == '\0')
break;
*p++ = ((gFirst + i) == gCurrent) ? TEXT_WHITE >> 8 : TEXT_GREEN >> 8;
*p++ = gDirTable[gFirst + i].name[j] - 0x20;
}
*p++ = ((gFirst + i) == gCurrent) ? TEXT_WHITE >> 8 : TEXT_GREEN >> 8;
*p++ = ']' - 0x20;
}
else
{
for (j = 0; j < 38; j++)
{
if (gDirTable[gFirst + i].name[j] == '\0')
break;
*p++ = ((gFirst + i) == gCurrent) ? TEXT_WHITE >> 8 : TEXT_GREEN >> 8;
*p++ = gDirTable[gFirst + i].name[j] - 0x20;
}
}
}
switch_banks();
sub_delay(1); // wait until vblank to update vram
i = do_md_cmd3(MD_CMD_COPY_VRAM, 0xC000 + 3*64*2, 0x200000, 20*64); // update plane A name table (20 lines of text)
if (i < 0)
{
if (i == -1)
strcpy(temp, "unknown command");
else if (i == -2)
strcpy(temp, "wait cmd done timeout");
else if (i == -3)
strcpy(temp, "wait cmd ack timeout");
else
strcpy(temp, "unknown error");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_RED, 1, 24);
sub_delay(120);
strcpy(temp, " ");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 24);
}
sub_delay(7);
gStage = 1;
}
else if (gStage == 1)
{
buttons = GET_PAD(0);
changed = (buttons & SEGA_CTRL_BUTTONS) ^ previous;
if (buttons & SEGA_CTRL_DOWN)
{
// DOWN pressed
gCurrent++;
if ((gCurrent - gFirst) >= 20)
gFirst = gCurrent;
if (gCurrent >= gCount)
gFirst = gCurrent = 0; // wrap around to first entry
gStage = 0;
}
if (buttons & SEGA_CTRL_UP)
{
// UP pressed
gCurrent--;
if (gCurrent < gFirst)
{
gFirst = gCurrent - 19;
if (gFirst < 0)
gFirst = 0;
}
if (gCurrent < 0)
{
gCurrent = gCount - 1; // wrap around to last entry
gFirst = gCurrent - 19;
if (gFirst < 0)
gFirst = 0;
}
gStage = 0;
}
if (!changed)
continue; // no change in buttons
previous = buttons & SEGA_CTRL_BUTTONS;
if (changed & SEGA_CTRL_A)
{
if (!(buttons & SEGA_CTRL_A))
{
// A just released
if (gDirTable[gCurrent].flags & 2)
{
// directory
global_vars->CWD_OFFSET = gDirTable[gCurrent].offset;
global_vars->CWD_LENGTH = gDirTable[gCurrent].length;
global_vars->CURR_OFFSET = -1;
first_dir_sec();
gCount = getCurrDir();
gFirst = gCurrent = 0;
gStage = 0;
}
else
{
sprintf(temp, "Loading Mod\n");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 24);
handle = cd_handle_from_offset(gDirTable[gCurrent].offset, gDirTable[gCurrent].length);
if (handle == NULL)
{
sprintf(temp, "failed to create cd handle\n");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_RED, 1, 24);
while (1) ;
}
/* load module */
i = InitMOD(handle, &module, gFilter);
if (!i)
{
/* start module */
sprintf(temp, "Playing %s - %d chan", module.Title, module.NumberOfChannels);
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 24);
StartMOD(&module, 0);
sub_delay(20);
while (CheckMOD(&module))
{
sub_delay(2);
buttons = GET_PAD(0);
changed = (buttons & SEGA_CTRL_BUTTONS) ^ previous;
if (!changed)
continue; // no change in buttons
previous = buttons & SEGA_CTRL_BUTTONS;
if (changed & SEGA_CTRL_C)
if (!(buttons & SEGA_CTRL_C))
break; // C just released - stop playing
}
StopMOD(&module);
ExitMOD(&module);
delete_cd_handle(handle);
strcpy(temp, " ");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 24);
}
else
{
sprintf(temp, "Error: %s\n", err_strings[i]);
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_RED, 1, 24);
sub_delay(300);
strcpy(temp, " ");
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 24);
}
}
}
}
if (changed & SEGA_CTRL_MODE)
{
if (!(buttons & SEGA_CTRL_MODE))
{
// MODE just released
gFilter = gFilter < 2 ? gFilter + 1: 0;
strcpy(temp, "Resample filter: ");
strcat(temp, flt_strings[gFilter]);
switch_banks();
do_md_cmd4(MD_CMD_PUT_STR, 0x200000, TEXT_GREEN, 1, 25);
}
}
}
}
return 0;
}