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Pulled a bunch of selection parts outside of the loops. Probably exhausting this angle of attack.

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This commit is contained in:
Thomas Harte 2016-04-05 22:17:44 -04:00
parent 8f87973a96
commit 2248769df9
1 changed files with 82 additions and 33 deletions
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115
Machines/Electron/Electron.cpp
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@ -538,6 +538,8 @@ inline void Machine::end_pixel_line()
inline void Machine::output_pixels(unsigned int number_of_cycles)
{
if(!number_of_cycles) return;
if(_isBlankLine)
{
_crt->output_blank(number_of_cycles * crt_cycles_multiplier);
@ -559,65 +561,112 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
_initial_output_target = _current_output_target = _crt->allocate_write_area(640 / _current_output_divider);
}
#define pack(a, b) (uint8_t)((a << 4) | (b))
while(number_of_cycles--)
#define get_pixel() \
if(_currentScreenAddress&32768)\
{\
_currentScreenAddress = (_screenModeBaseAddress + _currentScreenAddress)&32767;\
}\
_last_pixel_byte = _ram[_currentScreenAddress];\
_currentScreenAddress = _currentScreenAddress+8
switch(_screen_mode)
{
if(!(_current_pixel_column&1) || _screen_mode < 4)
{
if(_currentScreenAddress&32768)
{
_currentScreenAddress = (_screenModeBaseAddress + _currentScreenAddress)&32767;
}
_last_pixel_byte = _ram[_currentScreenAddress];
_currentScreenAddress = _currentScreenAddress+8;
}
switch(_screen_mode)
{
case 3:
case 0:
case 0: case 3:
while(number_of_cycles--)
{
get_pixel();
*(uint32_t *)_current_output_target = _paletteTables.eighty1bpp[_last_pixel_byte];
_current_output_target += 4;
_current_pixel_column++;
}
break;
break;
case 1:
case 1:
while(number_of_cycles--)
{
get_pixel();
*(uint16_t *)_current_output_target = _paletteTables.eighty2bpp[_last_pixel_byte];
_current_output_target += 2;
_current_pixel_column++;
}
break;
break;
case 2:
case 2:
while(number_of_cycles--)
{
get_pixel();
*_current_output_target = _paletteTables.eighty4bpp[_last_pixel_byte];
_current_output_target += 1;
_current_pixel_column++;
}
break;
break;
case 6:
case 4:
case 4: case 6:
if(_current_pixel_column&1)
{
*(uint16_t *)_current_output_target = _paletteTables.forty1bpp[_last_pixel_byte];
_last_pixel_byte <<= 4;
_current_output_target += 2;
}
break;
case 5:
number_of_cycles--;
_current_pixel_column++;
}
while(number_of_cycles > 1)
{
get_pixel();
*(uint16_t *)_current_output_target = _paletteTables.forty1bpp[_last_pixel_byte];
_current_output_target += 2;
_last_pixel_byte <<= 4;
*(uint16_t *)_current_output_target = _paletteTables.forty1bpp[_last_pixel_byte];
_current_output_target += 2;
number_of_cycles -= 2;
_current_pixel_column+=2;
}
if(number_of_cycles)
{
get_pixel();
*(uint16_t *)_current_output_target = _paletteTables.forty1bpp[_last_pixel_byte];
_current_output_target += 2;
_last_pixel_byte <<= 4;
_current_pixel_column++;
}
break;
case 5:
if(_current_pixel_column&1)
{
*_current_output_target = _paletteTables.forty2bpp[_last_pixel_byte];
_current_output_target += 1;
number_of_cycles--;
_current_pixel_column++;
}
while(number_of_cycles > 1)
{
get_pixel();
*_current_output_target = _paletteTables.forty2bpp[_last_pixel_byte];
_last_pixel_byte <<= 2;
_current_output_target += 1;
}
break;
}
#undef pack
_current_pixel_column++;
*_current_output_target = _paletteTables.forty2bpp[_last_pixel_byte];
_current_output_target += 1;
number_of_cycles -= 2;
_current_pixel_column+=2;
}
if(number_of_cycles)
{
get_pixel();
*_current_output_target = _paletteTables.forty2bpp[_last_pixel_byte];
_last_pixel_byte <<= 2;
_current_output_target += 1;
_current_pixel_column++;
}
break;
}
#undef get_pixel
}
}