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Edge towards proper serialisation.

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This commit is contained in:
Thomas Harte 2024-09-06 21:01:30 -04:00
parent 88248d7062
commit f10702b3ca
2 changed files with 32 additions and 12 deletions
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23
Machines/Acorn/Electron/Video.cpp
View File

@ -283,15 +283,17 @@ uint8_t VideoOutput::run_for(const Cycles cycles) {
// Determine current output item.
OutputStage stage;
int screen_pitch = screen_pitch_;
if(vsync_int || hsync_int) {
stage = OutputStage::Sync;
} else if(in_blank()) {
stage = OutputStage::Blank;
} else {
stage = OutputStage::Pixels;
screen_pitch = (mode_40 ? 320 : 640) / static_cast<int>(mode_bpp);
}
if(stage != output_) {
if(stage != output_ || screen_pitch != screen_pitch_) {
switch(output_) {
case OutputStage::Sync: crt_.output_sync(output_length_); break;
case OutputStage::Blank: crt_.output_blank(output_length_); break;
@ -308,15 +310,18 @@ uint8_t VideoOutput::run_for(const Cycles cycles) {
}
output_length_ = 0;
output_ = stage;
screen_pitch_ = screen_pitch;
if(stage == OutputStage::Pixels) {
initial_output_target_ = current_output_target_ = crt_.begin_data(640);//crt_.begin_data(mode_40 ? 320 : 640);
initial_output_target_ = current_output_target_ = crt_.begin_data(static_cast<size_t>(screen_pitch_));
}
}
++output_length_;
if(output_ == OutputStage::Pixels && (!mode_40 || h_count & 8) && current_output_target_) {
const uint8_t data = ram_[byte_addr | char_row];
switch(mode_bpp) {
case Bpp::One:
current_output_target_[0] = (data & 0x80) ? 0xff : 0x00;
current_output_target_[1] = (data & 0x40) ? 0xff : 0x00;
current_output_target_[2] = (data & 0x20) ? 0xff : 0x00;
@ -326,6 +331,20 @@ uint8_t VideoOutput::run_for(const Cycles cycles) {
current_output_target_[6] = (data & 0x02) ? 0xff : 0x00;
current_output_target_[7] = (data & 0x01) ? 0xff : 0x00;
current_output_target_ += 8;
break;
case Bpp::Two:
current_output_target_[0] = (data & 0x80) ? 0xff : 0x00;
current_output_target_[1] = (data & 0x20) ? 0xff : 0x00;
current_output_target_[2] = (data & 0x08) ? 0xff : 0x00;
current_output_target_[3] = (data & 0x02) ? 0xff : 0x00;
current_output_target_ += 4;
break;
case Bpp::Four:
current_output_target_[0] = (data & 0x80) ? 0xff : 0x00;
current_output_target_[1] = (data & 0x08) ? 0xff : 0x00;
current_output_target_ += 2;
break;
}
}
// Increment the byte address across the line.

3
Machines/Acorn/Electron/Video.hpp
View File

@ -85,6 +85,7 @@ class VideoOutput {
};
OutputStage output_;
int output_length_ = 0;
int screen_pitch_ = 0;
uint8_t *current_output_target_ = nullptr;
uint8_t *initial_output_target_ = nullptr;
@ -102,7 +103,7 @@ class VideoOutput {
bool mode_40 = true;
bool mode_text = false;
enum class Bpp {
One, Two, Four
One = 1, Two = 2, Four = 4
} mode_bpp = Bpp::One;
// Frame position.