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Attempted to take even more out of the inner pixel loop.

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This commit is contained in:
Thomas Harte 2015-08-13 23:23:04 +01:00
parent 391789e75c
commit 4b5aabdd54
1 changed files with 35 additions and 9 deletions
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44
Machines/Atari2600.cpp
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@ -43,14 +43,14 @@ void Machine::switch_region()
void Machine::get_output_pixel(uint8_t *pixel, int offset)
{
const uint8_t palette[16][3] =
static const uint8_t palette[16][3] =
{
{255, 255, 255}, {253, 250, 115}, {236, 199, 125}, {252, 187, 151},
{252, 180, 181}, {235, 177, 223}, {211, 178, 250}, {187, 182, 250},
{164, 186, 250}, {166, 201, 250}, {164, 224, 251}, {165, 251, 213},
{185, 251, 187}, {201, 250, 168}, {225, 235, 160}, {252, 223, 145}
};
const uint8_t alphaValues[8] =
static const uint8_t alphaValues[8] =
{
// 0, 64, 108, 144, 176, 200, 220, 255
// };
@ -60,12 +60,8 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
};
// get the playfield pixel and hence a proposed colour
const int x = offset >> 2;
const int mirrored = (x / 20) & (_playfieldControl&1);
const int index = mirrored ? 39 - x : (x%20);
uint8_t playfieldPixel = _playfield[index];
uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[x / 20] : _playfieldColour;
uint8_t playfieldPixel = _playfield[offset >> 2];
uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[offset / 80] : _playfieldColour;
// get player and missile proposed pixels
uint8_t playerPixels[2], missilePixels[2];
@ -367,7 +363,19 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
case 0x08: _playfieldColour = *value; break;
case 0x09: _backgroundColour = *value; break;
case 0x0a: _playfieldControl = *value; break;
case 0x0a: {
uint8_t old_playfield_control = _playfieldControl;
_playfieldControl = *value;
// did the mirroring bit change?
if((_playfieldControl^old_playfield_control)&1) {
if(_playfieldControl&1) {
for(int c = 0; c < 20; c++) _playfield[c+20] = _playfield[19-c];
} else {
memcpy(&_playfield[20], _playfield, 20);
}
}
} break;
case 0x0b:
case 0x0c: _playerReflection[decodedAddress - 0x0b] = *value; break;
@ -376,6 +384,12 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
_playfield[1] = ((*value) >> 5)&1;
_playfield[2] = ((*value) >> 6)&1;
_playfield[3] = (*value) >> 7;
if(_playfieldControl&1) {
for(int c = 0; c < 4; c++) _playfield[39-c] = _playfield[c];
} else {
memcpy(&_playfield[20], _playfield, 4);
}
break;
case 0x0e:
_playfield[4] = (*value) >> 7;
@ -386,6 +400,12 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
_playfield[9] = ((*value) >> 2)&1;
_playfield[10] = ((*value) >> 1)&1;
_playfield[11] = (*value)&1;
if(_playfieldControl&1) {
for(int c = 0; c < 8; c++) _playfield[35-c] = _playfield[c+4];
} else {
memcpy(&_playfield[24], &_playfield[4], 8);
}
break;
case 0x0f:
_playfield[19] = (*value) >> 7;
@ -396,6 +416,12 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
_playfield[14] = ((*value) >> 2)&1;
_playfield[13] = ((*value) >> 1)&1;
_playfield[12] = (*value)&1;
if(_playfieldControl&1) {
for(int c = 0; c < 8; c++) _playfield[27-c] = _playfield[c+12];
} else {
memcpy(&_playfield[32], &_playfield[12], 8);
}
break;
case 0x10: case 0x11: case 0x12: case 0x13: