mirror of
https://github.com/libretro/snes9x.git
synced 2024-11-27 10:30:31 +00:00
362 lines
8.4 KiB
C++
362 lines
8.4 KiB
C++
/*****************************************************************************\
|
|
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
|
|
This file is licensed under the Snes9x License.
|
|
For further information, consult the LICENSE file in the root directory.
|
|
\*****************************************************************************/
|
|
|
|
#include "snes9x.h"
|
|
#include "memmap.h"
|
|
|
|
static void DSP2_Op01 (void);
|
|
static void DSP2_Op03 (void);
|
|
static void DSP2_Op05 (void);
|
|
static void DSP2_Op06 (void);
|
|
static void DSP2_Op09 (void);
|
|
static void DSP2_Op0D (void);
|
|
|
|
|
|
// convert bitmap to bitplane tile
|
|
static void DSP2_Op01 (void)
|
|
{
|
|
// Op01 size is always 32 bytes input and output
|
|
// The hardware does strange things if you vary the size
|
|
|
|
uint8 c0, c1, c2, c3;
|
|
uint8 *p1 = DSP2.parameters;
|
|
uint8 *p2a = DSP2.output;
|
|
uint8 *p2b = DSP2.output + 16; // halfway
|
|
|
|
// Process 8 blocks of 4 bytes each
|
|
|
|
for (int j = 0; j < 8; j++)
|
|
{
|
|
c0 = *p1++;
|
|
c1 = *p1++;
|
|
c2 = *p1++;
|
|
c3 = *p1++;
|
|
|
|
*p2a++ = (c0 & 0x10) << 3 |
|
|
(c0 & 0x01) << 6 |
|
|
(c1 & 0x10) << 1 |
|
|
(c1 & 0x01) << 4 |
|
|
(c2 & 0x10) >> 1 |
|
|
(c2 & 0x01) << 2 |
|
|
(c3 & 0x10) >> 3 |
|
|
(c3 & 0x01);
|
|
|
|
*p2a++ = (c0 & 0x20) << 2 |
|
|
(c0 & 0x02) << 5 |
|
|
(c1 & 0x20) |
|
|
(c1 & 0x02) << 3 |
|
|
(c2 & 0x20) >> 2 |
|
|
(c2 & 0x02) << 1 |
|
|
(c3 & 0x20) >> 4 |
|
|
(c3 & 0x02) >> 1;
|
|
|
|
*p2b++ = (c0 & 0x40) << 1 |
|
|
(c0 & 0x04) << 4 |
|
|
(c1 & 0x40) >> 1 |
|
|
(c1 & 0x04) << 2 |
|
|
(c2 & 0x40) >> 3 |
|
|
(c2 & 0x04) |
|
|
(c3 & 0x40) >> 5 |
|
|
(c3 & 0x04) >> 2;
|
|
|
|
*p2b++ = (c0 & 0x80) |
|
|
(c0 & 0x08) << 3 |
|
|
(c1 & 0x80) >> 2 |
|
|
(c1 & 0x08) << 1 |
|
|
(c2 & 0x80) >> 4 |
|
|
(c2 & 0x08) >> 1 |
|
|
(c3 & 0x80) >> 6 |
|
|
(c3 & 0x08) >> 3;
|
|
}
|
|
}
|
|
|
|
// set transparent color
|
|
static void DSP2_Op03 (void)
|
|
{
|
|
DSP2.Op05Transparent = DSP2.parameters[0];
|
|
}
|
|
|
|
// replace bitmap using transparent color
|
|
static void DSP2_Op05 (void)
|
|
{
|
|
// Overlay bitmap with transparency.
|
|
// Input:
|
|
//
|
|
// Bitmap 1: i[0] <=> i[size-1]
|
|
// Bitmap 2: i[size] <=> i[2*size-1]
|
|
//
|
|
// Output:
|
|
//
|
|
// Bitmap 3: o[0] <=> o[size-1]
|
|
//
|
|
// Processing:
|
|
//
|
|
// Process all 4-bit pixels (nibbles) in the bitmap
|
|
//
|
|
// if ( BM2_pixel == transparent_color )
|
|
// pixelout = BM1_pixel
|
|
// else
|
|
// pixelout = BM2_pixel
|
|
|
|
// The max size bitmap is limited to 255 because the size parameter is a byte
|
|
// I think size=0 is an error. The behavior of the chip on size=0 is to
|
|
// return the last value written to DR if you read DR on Op05 with
|
|
// size = 0. I don't think it's worth implementing this quirk unless it's
|
|
// proven necessary.
|
|
|
|
uint8 color;
|
|
uint8 c1, c2;
|
|
uint8 *p1 = DSP2.parameters;
|
|
uint8 *p2 = DSP2.parameters + DSP2.Op05Len;
|
|
uint8 *p3 = DSP2.output;
|
|
|
|
color = DSP2.Op05Transparent & 0x0f;
|
|
|
|
for (int32 n = 0; n < DSP2.Op05Len; n++)
|
|
{
|
|
c1 = *p1++;
|
|
c2 = *p2++;
|
|
*p3++ = (((c2 >> 4) == color) ? c1 & 0xf0: c2 & 0xf0) | (((c2 & 0x0f) == color) ? c1 & 0x0f: c2 & 0x0f);
|
|
}
|
|
}
|
|
|
|
// reverse bitmap
|
|
static void DSP2_Op06 (void)
|
|
{
|
|
// Input:
|
|
// size
|
|
// bitmap
|
|
|
|
for (int32 i = 0, j = DSP2.Op06Len - 1; i < DSP2.Op06Len; i++, j--)
|
|
DSP2.output[j] = (DSP2.parameters[i] << 4) | (DSP2.parameters[i] >> 4);
|
|
}
|
|
|
|
// multiply
|
|
static void DSP2_Op09 (void)
|
|
{
|
|
DSP2.Op09Word1 = DSP2.parameters[0] | (DSP2.parameters[1] << 8);
|
|
DSP2.Op09Word2 = DSP2.parameters[2] | (DSP2.parameters[3] << 8);
|
|
|
|
uint32 temp = DSP2.Op09Word1 * DSP2.Op09Word2;
|
|
DSP2.output[0] = temp & 0xFF;
|
|
DSP2.output[1] = (temp >> 8) & 0xFF;
|
|
DSP2.output[2] = (temp >> 16) & 0xFF;
|
|
DSP2.output[3] = (temp >> 24) & 0xFF;
|
|
}
|
|
|
|
// scale bitmap
|
|
static void DSP2_Op0D (void)
|
|
{
|
|
// Bit accurate hardware algorithm - uses fixed point math
|
|
// This should match the DSP2 Op0D output exactly
|
|
// I wouldn't recommend using this unless you're doing hardware debug.
|
|
// In some situations it has small visual artifacts that
|
|
// are not readily apparent on a TV screen but show up clearly
|
|
// on a monitor. Use Overload's scaling instead.
|
|
// This is for hardware verification testing.
|
|
//
|
|
// One note: the HW can do odd byte scaling but since we divide
|
|
// by two to get the count of bytes this won't work well for
|
|
// odd byte scaling (in any of the current algorithm implementations).
|
|
// So far I haven't seen Dungeon Master use it.
|
|
// If it does we can adjust the parameters and code to work with it
|
|
|
|
uint32 multiplier; // Any size int >= 32-bits
|
|
uint32 pixloc; // match size of multiplier
|
|
uint8 pixelarray[512];
|
|
|
|
if (DSP2.Op0DInLen <= DSP2.Op0DOutLen)
|
|
multiplier = 0x10000; // In our self defined fixed point 0x10000 == 1
|
|
else
|
|
multiplier = (DSP2.Op0DInLen << 17) / ((DSP2.Op0DOutLen << 1) + 1);
|
|
|
|
pixloc = 0;
|
|
|
|
for (int32 i = 0; i < DSP2.Op0DOutLen * 2; i++)
|
|
{
|
|
int32 j = pixloc >> 16;
|
|
|
|
if (j & 1)
|
|
pixelarray[i] = DSP2.parameters[j >> 1] & 0x0f;
|
|
else
|
|
pixelarray[i] = (DSP2.parameters[j >> 1] & 0xf0) >> 4;
|
|
|
|
pixloc += multiplier;
|
|
}
|
|
|
|
for (int32 i = 0; i < DSP2.Op0DOutLen; i++)
|
|
DSP2.output[i] = (pixelarray[i << 1] << 4) | pixelarray[(i << 1) + 1];
|
|
}
|
|
|
|
/*
|
|
static void DSP2_Op0D (void)
|
|
{
|
|
// Overload's algorithm - use this unless doing hardware testing
|
|
|
|
// One note: the HW can do odd byte scaling but since we divide
|
|
// by two to get the count of bytes this won't work well for
|
|
// odd byte scaling (in any of the current algorithm implementations).
|
|
// So far I haven't seen Dungeon Master use it.
|
|
// If it does we can adjust the parameters and code to work with it
|
|
|
|
int32 pixel_offset;
|
|
uint8 pixelarray[512];
|
|
|
|
for (int32 i = 0; i < DSP2.Op0DOutLen * 2; i++)
|
|
{
|
|
pixel_offset = (i * DSP2.Op0DInLen) / DSP2.Op0DOutLen;
|
|
|
|
if ((pixel_offset & 1) == 0)
|
|
pixelarray[i] = DSP2.parameters[pixel_offset >> 1] >> 4;
|
|
else
|
|
pixelarray[i] = DSP2.parameters[pixel_offset >> 1] & 0x0f;
|
|
}
|
|
|
|
for (int32 i = 0; i < DSP2.Op0DOutLen; i++)
|
|
DSP2.output[i] = (pixelarray[i << 1] << 4) | pixelarray[(i << 1) + 1];
|
|
}
|
|
*/
|
|
|
|
void DSP2SetByte (uint8 byte, uint16 address)
|
|
{
|
|
if ((address & 0xf000) == 0x6000 || (address >= 0x8000 && address < 0xc000))
|
|
{
|
|
if (DSP2.waiting4command)
|
|
{
|
|
DSP2.command = byte;
|
|
DSP2.in_index = 0;
|
|
DSP2.waiting4command = FALSE;
|
|
|
|
switch (byte)
|
|
{
|
|
case 0x01: DSP2.in_count = 32; break;
|
|
case 0x03: DSP2.in_count = 1; break;
|
|
case 0x05: DSP2.in_count = 1; break;
|
|
case 0x06: DSP2.in_count = 1; break;
|
|
case 0x09: DSP2.in_count = 4; break;
|
|
case 0x0D: DSP2.in_count = 2; break;
|
|
default:
|
|
#ifdef DEBUGGER
|
|
//printf("Op%02X\n", byte);
|
|
#endif
|
|
case 0x0f: DSP2.in_count = 0; break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
DSP2.parameters[DSP2.in_index] = byte;
|
|
DSP2.in_index++;
|
|
}
|
|
|
|
if (DSP2.in_count == DSP2.in_index)
|
|
{
|
|
DSP2.waiting4command = TRUE;
|
|
DSP2.out_index = 0;
|
|
|
|
switch (DSP2.command)
|
|
{
|
|
case 0x01:
|
|
DSP2.out_count = 32;
|
|
DSP2_Op01();
|
|
break;
|
|
|
|
case 0x03:
|
|
DSP2_Op03();
|
|
break;
|
|
|
|
case 0x05:
|
|
if (DSP2.Op05HasLen)
|
|
{
|
|
DSP2.Op05HasLen = FALSE;
|
|
DSP2.out_count = DSP2.Op05Len;
|
|
DSP2_Op05();
|
|
}
|
|
else
|
|
{
|
|
DSP2.Op05Len = DSP2.parameters[0];
|
|
DSP2.in_index = 0;
|
|
DSP2.in_count = 2 * DSP2.Op05Len;
|
|
DSP2.Op05HasLen = TRUE;
|
|
if (byte)
|
|
DSP2.waiting4command = FALSE;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0x06:
|
|
if (DSP2.Op06HasLen)
|
|
{
|
|
DSP2.Op06HasLen = FALSE;
|
|
DSP2.out_count = DSP2.Op06Len;
|
|
DSP2_Op06();
|
|
}
|
|
else
|
|
{
|
|
DSP2.Op06Len = DSP2.parameters[0];
|
|
DSP2.in_index = 0;
|
|
DSP2.in_count = DSP2.Op06Len;
|
|
DSP2.Op06HasLen = TRUE;
|
|
if (byte)
|
|
DSP2.waiting4command = FALSE;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0x09:
|
|
DSP2.out_count = 4;
|
|
DSP2_Op09();
|
|
break;
|
|
|
|
case 0x0D:
|
|
if (DSP2.Op0DHasLen)
|
|
{
|
|
DSP2.Op0DHasLen = FALSE;
|
|
DSP2.out_count = DSP2.Op0DOutLen;
|
|
DSP2_Op0D();
|
|
}
|
|
else
|
|
{
|
|
DSP2.Op0DInLen = DSP2.parameters[0];
|
|
DSP2.Op0DOutLen = DSP2.parameters[1];
|
|
DSP2.in_index = 0;
|
|
DSP2.in_count = (DSP2.Op0DInLen + 1) >> 1;
|
|
DSP2.Op0DHasLen = TRUE;
|
|
if (byte)
|
|
DSP2.waiting4command = FALSE;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0x0f:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint8 DSP2GetByte (uint16 address)
|
|
{
|
|
uint8 t;
|
|
|
|
if ((address & 0xf000) == 0x6000 || (address >= 0x8000 && address < 0xc000))
|
|
{
|
|
if (DSP2.out_count)
|
|
{
|
|
t = (uint8) DSP2.output[DSP2.out_index];
|
|
DSP2.out_index++;
|
|
if (DSP2.out_count == DSP2.out_index)
|
|
DSP2.out_count = 0;
|
|
}
|
|
else
|
|
t = 0xff;
|
|
}
|
|
else
|
|
t = 0x80;
|
|
|
|
return (t);
|
|
}
|