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Manage pixel buffers.

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This commit is contained in:
Thomas Harte 2024-03-22 10:10:13 -04:00
parent ae6cf69449
commit c4e6b18294
1 changed files with 41 additions and 12 deletions
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53
Machines/Acorn/Archimedes/Video.hpp
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@ -136,6 +136,35 @@ struct Video {
// Accumulate total phase.
++time_in_phase_;
// Grab some more pixels if appropriate.
const auto flush_pixels = [&]() {
const auto duration = static_cast<int>(time_in_phase_);
crt_.output_data(duration, static_cast<size_t>(time_in_phase_));
time_in_phase_ = 0;
pixels_ = nullptr;
};
if(phase_ == Phase::Display) {
if(pixels_ && time_in_phase_ == PixelBufferSize) {
flush_pixels();
}
if(!pixels_) {
if(time_in_phase_) {
flush_pixels();
}
pixels_ = reinterpret_cast<uint16_t *>(crt_.begin_data(PixelBufferSize));
}
if(pixels_) {
*pixels_ = 0xffff & time_in_phase_;
++pixels_;
}
}
// Determine current output phase.
Phase new_phase;
switch(vertical_state_.phase) {
case Phase::Sync: new_phase = Phase::Sync; break;
@ -148,23 +177,21 @@ struct Video {
break;
}
// Possibly output something. TODO: with actual pixels.
// Possibly output something.
if(new_phase != phase_) {
const auto duration = static_cast<int>(time_in_phase_);
if(time_in_phase_) {
const auto duration = static_cast<int>(time_in_phase_);
switch(phase_) {
case Phase::Sync: crt_.output_sync(duration); break;
case Phase::Blank: crt_.output_blank(duration); break;
case Phase::Display: // TODO: pixels.
crt_.output_level<uint16_t>(duration, 0xf888);
break;
case Phase::Border:
crt_.output_level<uint16_t>(duration, border_colour_);
break;
switch(phase_) {
case Phase::Sync: crt_.output_sync(duration); break;
case Phase::Blank: crt_.output_blank(duration); break;
case Phase::Display: flush_pixels(); break;
case Phase::Border: crt_.output_level<uint16_t>(duration, border_colour_); break;
}
time_in_phase_ = 0;
}
phase_ = new_phase;
time_in_phase_ = 0;
}
}
@ -215,6 +242,8 @@ private:
State horizontal_state_, vertical_state_;
Phase phase_ = Phase::Sync;
uint32_t time_in_phase_ = 0;
uint16_t *pixels_ = nullptr;
static constexpr size_t PixelBufferSize = 320;
// Programmer-set addresses.
uint32_t buffer_start_ = 0;