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Eliminates 'reversed_c' as I no longer believe low-resolution colour numbers are reversed.

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Also gets explicit about phase.
This commit is contained in:
Thomas Harte 2018-05-29 22:30:45 -04:00
parent a26ab7086d
commit 8dd7c6ef23
2 changed files with 15 additions and 6 deletions
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12
Machines/AppleII/Video.cpp
View File

@ -36,6 +36,7 @@ VideoBase::VideoBase() :
// Show only the centre 75% of the TV frame.
crt_->set_video_signal(Outputs::CRT::VideoSignal::Composite);
crt_->set_visible_area(Outputs::CRT::Rect(0.115f, 0.117f, 0.77f, 0.77f));
crt_->set_immediate_default_phase(0.0f);
}
Outputs::CRT::CRT *VideoBase::get_crt() {
@ -46,6 +47,12 @@ uint16_t VideoBase::scaled_byte[256];
uint16_t VideoBase::low_resolution_patterns[2][16];
void VideoBase::setup_tables() {
// Rules of Apple II high resolution video:
//
// Bit 0 appears on screen first. Then bit 1. Etc to bit 6.
//
// If bit 7 is set, the whole serialisation is delayed for half a pixel, holding
// whichever level was previously being output.
for(int c = 0; c < 128; ++c) {
const uint16_t value =
((c & 0x01) ? 0x0003 : 0x0000) |
@ -70,17 +77,16 @@ void VideoBase::setup_tables() {
for(int c = 0; c < 16; ++c) {
// Produce the whole 28-bit pattern that would cover two columns.
const int reversed_c = ((c&0x1) ? 0x8 : 0x0) | ((c&0x2) ? 0x4 : 0x0) | ((c&0x4) ? 0x2 : 0x0) | ((c&0x8) ? 0x1 : 0x0);
int pattern = 0;
for(int l = 0; l < 7; ++l) {
pattern <<= 4;
pattern |= reversed_c;
pattern |= c;
}
// Pack that 28-bit pattern into the appropriate look-up tables.
uint8_t *const left_entry = reinterpret_cast<uint8_t *>(&low_resolution_patterns[0][c]);
uint8_t *const right_entry = reinterpret_cast<uint8_t *>(&low_resolution_patterns[1][c]);
left_entry[0] = static_cast<uint8_t>(pattern);;
left_entry[0] = static_cast<uint8_t>(pattern);
left_entry[1] = static_cast<uint8_t>(pattern >> 7);
right_entry[0] = static_cast<uint8_t>(pattern >> 14);
right_entry[1] = static_cast<uint8_t>(pattern >> 21);

9
Machines/AppleII/Video.hpp
View File

@ -144,15 +144,15 @@ template <class BusHandler> class Video: public VideoBase {
const uint8_t graphic = bus_handler_.perform_read(static_cast<uint16_t>(graphics_address + c));
pixel_pointer_[c] = scaled_byte[graphic];
if(graphic & 0x80) {
reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= graphics_carry_;
reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= (graphics_carry_&1);
}
graphics_carry_ = (graphic >> 6) & 1;
graphics_carry_ = graphic >> 6;
}
break;
}
if(ending_column >= 40) {
crt_->output_data(280, 80);
output_data(80);
}
} else {
if(ending_column >= 40) {
@ -261,6 +261,9 @@ template <class BusHandler> class Video: public VideoBase {
const int flash_length = 8406;
BusHandler &bus_handler_;
void output_data(unsigned int length) {
crt_->output_data((length*7)/2, length);
}
};
}