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Blitter BLTCON0 channel modification mid blit emulation update.

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This commit is contained in:
Toni Wilen 2023-09-22 21:30:47 +03:00
parent 57c120587a
commit cc2cb06a4a
1 changed files with 6 additions and 6 deletions
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12
blitter.cpp
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@ -1164,6 +1164,10 @@ static int get_current_channel(void)
}
} else {
// order is important when multiple bits in shift register
// A (if not also D)
if (shifter[0] && (bltcon0 & BLTCHA) && !shifter[3]) {
return 1;
}
// C
if (shifter[2] && (bltcon0 & BLTCHC)) {
return 3;
@ -1173,10 +1177,6 @@ static int get_current_channel(void)
if (shifter[3] && (bltcon0 & BLTCHC) && (shifter[0] || shifter[1])) {
return 3;
}
// A
if (shifter[0] && (bltcon0 & BLTCHA)) {
return 1;
}
// B
if (shifter[1] && (bltcon0 & BLTCHB)) {
return 2;
@ -1265,9 +1265,8 @@ static int blitter_next_cycle(void)
memset(shifter, 0, sizeof(shifter));
if (shifter_skip_b_old && !shifter_skip_b) {
// if B skip was disabled: A goes both to B and C
// if B skip was disabled: A goes to B
tmp[1] = tmp[0];
tmp[2] = tmp[0];
shifter_skip_b_old = shifter_skip_b;
blitchanged = true;
} else if (!shifter_skip_b_old && shifter_skip_b) {
@ -1280,6 +1279,7 @@ static int blitter_next_cycle(void)
if (shifter_skip_y_old && !shifter_skip_y) {
// if Y skip was disabled: X goes both to Y and OUT
tmp[3] = tmp[2];
shifter_out = tmp[3];
shifter_skip_y_old = shifter_skip_y;
blitchanged = true;
} else if (!shifter_skip_y_old && shifter_skip_y) {