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Corrects graphics 'carry' — the potential holdover into delayed bytes.

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Thomas Harte
2018-04-26 19:26:43 -04:00
parent 244721a6f8
commit 850a394eb5
1 changed files with 3 additions and 2 deletions
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5
Machines/AppleII/Video.hpp
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@@ -103,6 +103,7 @@ template <class BusHandler> class Video: public VideoBase {
if(row_ < 192) { if(row_ < 192) {
if(!column_) { if(!column_) {
pixel_pointer_ = reinterpret_cast<uint16_t *>(crt_->allocate_write_area(80, 2)); pixel_pointer_ = reinterpret_cast<uint16_t *>(crt_->allocate_write_area(80, 2));
graphics_carry_ = 0;
} }
const int pixel_end = std::min(40, ending_column); const int pixel_end = std::min(40, ending_column);
@@ -143,9 +144,9 @@ template <class BusHandler> class Video: public VideoBase {
const uint8_t graphic = bus_handler_.perform_read(static_cast<uint16_t>(graphics_address + c)); const uint8_t graphic = bus_handler_.perform_read(static_cast<uint16_t>(graphics_address + c));
pixel_pointer_[c] = scaled_byte[graphic]; pixel_pointer_[c] = scaled_byte[graphic];
if(graphic & 0x80) { if(graphic & 0x80) {
reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= graphics_carry_ << 7; reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= graphics_carry_;
} }
graphics_carry_ = pixel_pointer_[c] & 1; graphics_carry_ = (graphic >> 6) & 1;
} }
break; break;
} }