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Switched to table-based byte to output conversion.

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This commit is contained in:
Thomas Harte 2016-04-05 22:07:10 -04:00
parent e35456612a
commit 8f87973a96
2 changed files with 37 additions and 11 deletions
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40
Machines/Electron/Electron.cpp
View File

@ -266,6 +266,30 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
_palette[registers[index][0]] = (_palette[registers[index][0]]&5) | ((colour >> 2)&2);
_palette[registers[index][1]] = (_palette[registers[index][1]]&5) | ((colour >> 1)&2);
}
// regenerate all palette tables for now
#define pack(a, b) (uint8_t)((a << 4) | (b))
for(int byte = 0; byte < 256; byte++)
{
uint8_t *target = (uint8_t *)&_paletteTables.forty1bpp[byte];
target[0] = pack(_palette[(byte&0x80) >> 4], _palette[(byte&0x40) >> 3]);
target[1] = pack(_palette[(byte&0x20) >> 2], _palette[(byte&0x10) >> 1]);
target = (uint8_t *)&_paletteTables.eighty2bpp[byte];
target[0] = pack(_palette[((byte&0x80) >> 4) | ((byte&0x08) >> 2)], _palette[((byte&0x40) >> 3) | ((byte&0x04) >> 1)]);
target[1] = pack(_palette[((byte&0x20) >> 2) | ((byte&0x02) >> 0)], _palette[((byte&0x10) >> 1) | ((byte&0x01) << 1)]);
target = (uint8_t *)&_paletteTables.eighty1bpp[byte];
target[0] = pack(_palette[(byte&0x80) >> 4], _palette[(byte&0x40) >> 3]);
target[1] = pack(_palette[(byte&0x20) >> 2], _palette[(byte&0x10) >> 1]);
target[2] = pack(_palette[(byte&0x08) >> 0], _palette[(byte&0x04) << 1]);
target[3] = pack(_palette[(byte&0x02) << 2], _palette[(byte&0x01) << 3]);
_paletteTables.forty2bpp[byte] = pack(_palette[((byte&0x80) >> 4) | ((byte&0x08) >> 2)], _palette[((byte&0x40) >> 3) | ((byte&0x04) >> 1)]);
_paletteTables.eighty4bpp[byte] = pack( _palette[((byte&0x80) >> 4) | ((byte&0x20) >> 3) | ((byte&0x08) >> 2) | ((byte&0x02) >> 1)],
_palette[((byte&0x40) >> 3) | ((byte&0x10) >> 2) | ((byte&0x04) >> 1) | ((byte&0x01) >> 0)]);
}
#undef pack
}
}
break;
@ -554,26 +578,21 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
case 3:
case 0:
{
_current_output_target[0] = pack(_palette[(_last_pixel_byte&0x80) >> 4], _palette[(_last_pixel_byte&0x40) >> 3]);
_current_output_target[1] = pack(_palette[(_last_pixel_byte&0x20) >> 2], _palette[(_last_pixel_byte&0x10) >> 1]);
_current_output_target[2] = pack(_palette[(_last_pixel_byte&0x08) >> 0], _palette[(_last_pixel_byte&0x04) << 1]);
_current_output_target[3] = pack(_palette[(_last_pixel_byte&0x02) << 2], _palette[(_last_pixel_byte&0x01) << 3]);
*(uint32_t *)_current_output_target = _paletteTables.eighty1bpp[_last_pixel_byte];
_current_output_target += 4;
}
break;
case 1:
{
_current_output_target[0] = pack(_palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)], _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)]);
_current_output_target[1] = pack(_palette[((_last_pixel_byte&0x20) >> 2) | ((_last_pixel_byte&0x02) >> 0)], _palette[((_last_pixel_byte&0x10) >> 1) | ((_last_pixel_byte&0x01) << 1)]);
*(uint16_t *)_current_output_target = _paletteTables.eighty2bpp[_last_pixel_byte];
_current_output_target += 2;
}
break;
case 2:
{
_current_output_target[0] = pack( _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x20) >> 3) | ((_last_pixel_byte&0x08) >> 2) | ((_last_pixel_byte&0x02) >> 1)],
_palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x10) >> 2) | ((_last_pixel_byte&0x04) >> 1) | ((_last_pixel_byte&0x01) >> 0)]);
*_current_output_target = _paletteTables.eighty4bpp[_last_pixel_byte];
_current_output_target += 1;
}
break;
@ -581,8 +600,7 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
case 6:
case 4:
{
_current_output_target[0] = pack(_palette[(_last_pixel_byte&0x80) >> 4], _palette[(_last_pixel_byte&0x40) >> 3]);
_current_output_target[1] = pack(_palette[(_last_pixel_byte&0x20) >> 2], _palette[(_last_pixel_byte&0x10) >> 1]);
*(uint16_t *)_current_output_target = _paletteTables.forty1bpp[_last_pixel_byte];
_last_pixel_byte <<= 4;
_current_output_target += 2;
}
@ -590,7 +608,7 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
case 5:
{
_current_output_target[0] = pack(_palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)], _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)]);
*_current_output_target = _paletteTables.forty2bpp[_last_pixel_byte];
_last_pixel_byte <<= 2;
_current_output_target += 1;
}

8
Machines/Electron/Electron.hpp
View File

@ -189,6 +189,14 @@ class Machine: public CPU6502::Processor<Machine>, Tape::Delegate {
unsigned int _frameCycles, _displayOutputPosition;
int _audioOutputPosition, _audioOutputPositionError;
struct {
uint16_t forty1bpp[256];
uint8_t forty2bpp[256];
uint32_t eighty1bpp[256];
uint16_t eighty2bpp[256];
uint8_t eighty4bpp[256];
} _paletteTables;
// Display generation.
uint16_t _startLineAddress, _currentScreenAddress;
int _current_pixel_line, _current_pixel_column, _current_character_row;