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Makes endian aware.

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This commit is contained in:
Thomas Harte 2019-11-09 09:48:59 -05:00
parent d2324e413d
commit 45375fb5d0
1 changed files with 13 additions and 8 deletions
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21
Machines/AtariST/Video.cpp
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@ -302,8 +302,13 @@ void Video::shift_out(int length) {
output_shifter_ <<= pixels;
}
} break;
case OutputBpp::Two:
case OutputBpp::Two: {
pixel_buffer_.pixels_output += length;
#if TARGET_RT_BIG_ENDIAN
const int upper = 0;
#else
const int upper = 1;
#endif
if(pixel_buffer_.pixel_pointer) {
while(length--) {
*pixel_buffer_.pixel_pointer = palette_[
@ -313,20 +318,20 @@ void Video::shift_out(int length) {
// This ensures that the top two words shift one to the left;
// their least significant bits are fed from the most significant bits
// of the bottom two words, respectively.
shifter_halves_[1] = (shifter_halves_[1] << 1) & 0xfffefffe;
shifter_halves_[1] |= (shifter_halves_[0] & 0x80008000) >> 15;
shifter_halves_[0] = (shifter_halves_[0] << 1) & 0xfffefffe;
shifter_halves_[upper] = (shifter_halves_[upper] << 1) & 0xfffefffe;
shifter_halves_[upper] |= (shifter_halves_[upper^1] & 0x80008000) >> 15;
shifter_halves_[upper^1] = (shifter_halves_[upper^1] << 1) & 0xfffefffe;
++pixel_buffer_.pixel_pointer;
}
} else {
while(length--) {
shifter_halves_[1] = (shifter_halves_[1] << 1) & 0xfffefffe;
shifter_halves_[1] |= (shifter_halves_[0] & 0x80008000) >> 15;
shifter_halves_[0] = (shifter_halves_[0] << 1) & 0xfffefffe;
shifter_halves_[upper] = (shifter_halves_[upper] << 1) & 0xfffefffe;
shifter_halves_[upper] |= (shifter_halves_[upper^1] & 0x80008000) >> 15;
shifter_halves_[upper^1] = (shifter_halves_[upper^1] << 1) & 0xfffefffe;
}
}
break;
} break;
default:
case OutputBpp::Four:
pixel_buffer_.pixels_output += length >> 1;