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Simplifies border colour change propagation.

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I'm not sure it was even technically correct as was.
This commit is contained in:
Thomas Harte 2019-12-28 10:45:10 -05:00
parent f7825dd2a2
commit 13f11e071a
2 changed files with 18 additions and 11 deletions
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21
Machines/Atari/ST/Video.cpp
View File

@ -463,6 +463,8 @@ void Video::write(int address, uint16_t value) {
case 0x24: case 0x25: case 0x26: case 0x27:
case 0x28: case 0x29: case 0x2a: case 0x2b:
case 0x2c: case 0x2d: case 0x2e: case 0x2f: {
if(address == 0x20) video_stream_.will_change_border_colour();
raw_palette_[address - 0x20] = value;
uint8_t *const entry = reinterpret_cast<uint8_t *>(&palette_[address - 0x20]);
entry[0] = uint8_t((value & 0x700) >> 7);
@ -494,8 +496,8 @@ void Video::update_output_mode() {
video_stream_.set_bpp(output_bpp_);
}
const int freqs[] = {50, 60, 72};
printf("%d, %d -> %d [%d %d]\n", x_ / 2, y_, freqs[int(field_frequency_)], horizontal_.enable, vertical_.enable);
// const int freqs[] = {50, 60, 72};
// printf("%d, %d -> %d [%d %d]\n", x_ / 2, y_, freqs[int(field_frequency_)], horizontal_.enable, vertical_.enable);
}
// MARK: - The shifter
@ -550,12 +552,6 @@ void Video::VideoStream::generate(int duration, OutputMode mode, bool is_termina
return;
}
// If the background colour has changed and border is accumulated, flush it.
if(border_colour_ != palette_[0] && duration_) {
flush_border();
}
border_colour_ = palette_[0];
// If the shifter is empty, accumulate in duration_ a promise to draw border later.
if(!output_shifter_) {
if(pixel_pointer_) {
@ -586,10 +582,17 @@ void Video::VideoStream::generate(int duration, OutputMode mode, bool is_termina
}
}
void Video::VideoStream::will_change_border_colour() {
// Flush the accumulated border if it'd be adversely affected.
if(duration_ && output_mode_ == OutputMode::Pixels) {
flush_border();
}
}
void Video::VideoStream::flush_border() {
// Output colour 0 for the entirety of duration_ (or black, if this is 1bpp mode).
uint16_t *const colour_pointer = reinterpret_cast<uint16_t *>(crt_.begin_data(1));
if(colour_pointer) *colour_pointer = (bpp_ != OutputBpp::One) ? border_colour_ : 0;
if(colour_pointer) *colour_pointer = (bpp_ != OutputBpp::One) ? palette_[0] : 0;
crt_.output_level(duration_);
duration_ = 0;

8
Machines/Atari/ST/Video.hpp
View File

@ -177,7 +177,6 @@ class Video {
public:
VideoStream(Outputs::CRT::CRT &crt, uint16_t *palette) : crt_(crt), palette_(palette) {}
enum class OutputMode {
Sync, Blank, ColourBurst, Pixels,
};
@ -185,8 +184,14 @@ class Video {
/// Sets the current data format for the shifter. Changes in output BPP flush the shifter.
void set_bpp(OutputBpp bpp);
/// Outputs signal of type @c mode for @c duration.
void output(int duration, OutputMode mode);
/// Warns the video stream that the border colour, included in the palette that it holds a pointer to,
/// will change momentarily. This should be called after the relevant @c output() updates, and
/// is used to help elide border-regio output.
void will_change_border_colour();
/// Loads 64 bits into the Shifter. The shifter shifts continuously. If you also declare
/// a pixels region then whatever is being shifted will reach the display, in a form that
/// depends on the current output BPP.
@ -208,7 +213,6 @@ class Video {
// Internal state that is a function of output intent.
int duration_ = 0;
OutputMode output_mode_ = OutputMode::Sync;
uint16_t border_colour_ = 0;
OutputBpp bpp_ = OutputBpp::Four;
union {
uint64_t output_shifter_;