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#include "../copyright"
uint16_t DSP2Op09Word1 = 0;
uint16_t DSP2Op09Word2 = 0;
bool DSP2Op05HasLen = false;
int DSP2Op05Len = 0;
bool DSP2Op06HasLen = false;
int DSP2Op06Len = 0;
uint8_t DSP2Op05Transparent = 0;
void DSP2_Op05()
{
uint8_t color;
// 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.
int n;
unsigned char c1;
unsigned char c2;
unsigned char* p1 = DSP1.parameters;
unsigned char* p2 = &DSP1.parameters[DSP2Op05Len];
unsigned char* p3 = DSP1.output;
color = DSP2Op05Transparent & 0x0f;
for (n = 0; n < DSP2Op05Len; n++)
{
c1 = *p1++;
c2 = *p2++;
*p3++ = (((c2 >> 4) == color) ? c1 & 0xf0 : c2 & 0xf0) |
(((c2 & 0x0f) == color) ? c1 & 0x0f : c2 & 0x0f);
}
}
void DSP2_Op01()
{
// Op01 size is always 32 bytes input and output.
// The hardware does strange things if you vary the size.
int j;
unsigned char c0, c1, c2, c3;
unsigned char* p1 = DSP1.parameters;
unsigned char* p2a = DSP1.output;
unsigned char* p2b = &DSP1.output[16]; // halfway
// Process 8 blocks of 4 bytes each
for (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;
}
return;
}
void DSP2_Op06()
{
// Input:
// size
// bitmap
int i, j;
for (i = 0, j = DSP2Op06Len - 1; i < DSP2Op06Len; i++, j--)
DSP1.output[j] = (DSP1.parameters[i] << 4) | (DSP1.parameters[i] >> 4);
}
bool DSP2Op0DHasLen = false;
int DSP2Op0DOutLen = 0;
int DSP2Op0DInLen = 0;
#ifndef DSP2_BIT_ACCURRATE_CODE
// Scale bitmap based on input length out output length
void DSP2_Op0D()
{
// (Modified) Overload's algorithm - use this unless doing hardware testing
int i;
for(i = 0 ; i < DSP2Op0DOutLen ; i++)
{
int j = i << 1;
int pixel_offset_low = ((j * DSP2Op0DInLen) / DSP2Op0DOutLen) >> 1;
int pixel_offset_high = (((j + 1) * DSP2Op0DInLen) / DSP2Op0DOutLen) >> 1;
uint8_t pixel_low = DSP1.parameters[pixel_offset_low] >> 4;
uint8_t pixel_high = DSP1.parameters[pixel_offset_high] & 0x0f;
DSP1.output[i] = (pixel_low << 4) | pixel_high;
}
}
#else
void DSP2_Op0D()
{
// 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_t multiplier; // Any size int >= 32-bits
uint32_t pixloc; // match size of multiplier
int i, j;
uint8_t pixelarray[512];
if (DSP2Op0DInLen <= DSP2Op0DOutLen)
multiplier = 0x10000; // In our self defined fixed point 0x10000 == 1
else
multiplier = (DSP2Op0DInLen << 17) / ((DSP2Op0DOutLen << 1) + 1);
pixloc = 0;
for (i = 0; i < DSP2Op0DOutLen * 2; i++)
{
j = pixloc >> 16;
if (j & 1)
pixelarray[i] = DSP1.parameters[j >> 1] & 0x0f;
else
pixelarray[i] = (DSP1.parameters[j >> 1] & 0xf0) >> 4;
pixloc += multiplier;
}
for (i = 0; i < DSP2Op0DOutLen; i++)
DSP1.output[i] = (pixelarray[i << 1] << 4) | pixelarray[(i << 1) + 1];
}
#endif
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