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Rearranges draw loop around a fixed-size 568-sample line buffer.

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This commit is contained in:
Thomas Harte 2018-08-19 22:31:04 -04:00
parent 4209f0e044
commit e802f6ecc2
2 changed files with 123 additions and 114 deletions
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69
Machines/AppleII/Video.cpp
View File

@ -24,7 +24,7 @@ VideoBase::VideoBase(bool is_iie) :
// 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, 0.122f, 0.77f, 0.77f));
crt_->set_visible_area(Outputs::CRT::Rect(0.115f + 0.030769230769231f, 0.122f, 0.77f, 0.77f));
crt_->set_immediate_default_phase(0.0f);
}
@ -117,7 +117,7 @@ void VideoBase::set_character_rom(const std::vector<uint8_t> &character_rom) {
}
}
uint8_t *VideoBase::output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row) const {
void VideoBase::output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row) const {
const uint8_t inverses[] = {
0xff,
is_iie_ ? static_cast<uint8_t>(0xff) : static_cast<uint8_t>((flash_ / flash_length) * 0xff),
@ -134,20 +134,19 @@ uint8_t *VideoBase::output_text(uint8_t *target, uint8_t *source, size_t length,
const uint8_t character_pattern = character_rom_[character_address] ^ xor_mask;
// The character ROM is output MSB to LSB rather than LSB to MSB.
target[0] = character_pattern & 0x40;
target[1] = character_pattern & 0x20;
target[2] = character_pattern & 0x10;
target[3] = character_pattern & 0x08;
target[4] = character_pattern & 0x04;
target[5] = character_pattern & 0x02;
target[6] = character_pattern & 0x01;
target[0] = target[1] = character_pattern & 0x40;
target[2] = target[3] = character_pattern & 0x20;
target[4] = target[5] = character_pattern & 0x10;
target[6] = target[7] = character_pattern & 0x08;
target[8] = target[9] = character_pattern & 0x04;
target[10] = target[11] = character_pattern & 0x02;
target[12] = target[13] = character_pattern & 0x01;
graphics_carry_ = character_pattern & 0x01;
target += 7;
target += 14;
}
return target;
}
uint8_t *VideoBase::output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row) const {
void VideoBase::output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row) const {
for(size_t c = 0; c < length; ++c) {
const std::size_t character_addresses[2] = {
static_cast<std::size_t>(
@ -182,15 +181,14 @@ uint8_t *VideoBase::output_double_text(uint8_t *target, uint8_t *source, uint8_t
graphics_carry_ = character_patterns[1] & 0x01;
target += 14;
}
return target;
}
uint8_t *VideoBase::output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int row) const {
void VideoBase::output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int column, int row) const {
const int row_shift = row&4;
for(size_t c = 0; c < length; ++c) {
// Low-resolution graphics mode shifts the colour code on a loop, but has to account for whether this
// 14-sample output window is starting at the beginning of a colour cycle or halfway through.
if(c&1) {
if((column + static_cast<int>(c))&1) {
target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 4;
target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 8;
target[2] = target[6] = target[10] = (source[c] >> row_shift) & 1;
@ -205,13 +203,12 @@ uint8_t *VideoBase::output_low_resolution(uint8_t *target, uint8_t *source, size
}
target += 14;
}
return target;
}
uint8_t *VideoBase::output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int row) const {
void VideoBase::output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int column, int row) const {
const int row_shift = row&4;
for(size_t c = 0; c < length; ++c) {
if(c&1) {
if((column + static_cast<int>(c))&1) {
target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 2;
target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 4;
target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 8;
@ -236,10 +233,9 @@ uint8_t *VideoBase::output_double_low_resolution(uint8_t *target, uint8_t *sourc
}
target += 14;
}
return target;
}
uint8_t *VideoBase::output_high_resolution(uint8_t *target, uint8_t *source, size_t length) const {
void VideoBase::output_high_resolution(uint8_t *target, uint8_t *source, size_t length) const {
for(size_t c = 0; c < length; ++c) {
// High resolution graphics shift out LSB to MSB, optionally with a delay of half a pixel.
// If there is a delay, the previous output level is held to bridge the gap.
@ -264,27 +260,26 @@ uint8_t *VideoBase::output_high_resolution(uint8_t *target, uint8_t *source, siz
graphics_carry_ = source[c] & 0x40;
target += 14;
}
return target;
}
uint8_t *VideoBase::output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length) const {
void VideoBase::output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length) const {
for(size_t c = 0; c < length; ++c) {
target[0] = graphics_carry_;
target[1] = auxiliary_source[c] & 0x01;
target[2] = auxiliary_source[c] & 0x02;
target[3] = auxiliary_source[c] & 0x04;
target[4] = auxiliary_source[c] & 0x08;
target[5] = auxiliary_source[c] & 0x10;
target[6] = auxiliary_source[c] & 0x20;
target[7] = auxiliary_source[c] & 0x40;
target[8] = auxiliary_source[c] & 0x01;
target[9] = auxiliary_source[c] & 0x02;
target[10] = auxiliary_source[c] & 0x04;
target[11] = auxiliary_source[c] & 0x08;
target[12] = auxiliary_source[c] & 0x10;
target[13] = auxiliary_source[c] & 0x20;
target[0] = auxiliary_source[c] & 0x01;
target[1] = auxiliary_source[c] & 0x02;
target[2] = auxiliary_source[c] & 0x04;
target[3] = auxiliary_source[c] & 0x08;
target[4] = auxiliary_source[c] & 0x10;
target[5] = auxiliary_source[c] & 0x20;
target[6] = auxiliary_source[c] & 0x40;
target[7] = source[c] & 0x01;
target[8] = source[c] & 0x02;
target[9] = source[c] & 0x04;
target[10] = source[c] & 0x08;
target[11] = source[c] & 0x10;
target[12] = source[c] & 0x20;
target[13] = source[c] & 0x40;
graphics_carry_ = auxiliary_source[c] & 0x40;
target += 14;
}
return target;
}

168
Machines/AppleII/Video.hpp
View File

@ -148,22 +148,21 @@ class VideoBase {
// State affecting output video stream generation.
uint8_t *pixel_pointer_ = nullptr;
int pixel_pointer_column_ = 0;
bool pixels_are_high_density_ = false;
// State affecting logical state.
int row_ = 0, column_ = 0, flash_ = 0;
// Enumerates all Apple II and IIe display modes.
enum class GraphicsMode {
LowRes,
LowRes = 0,
DoubleLowRes,
HighRes,
DoubleHighRes,
Text,
DoubleText
DoubleText,
};
bool is_text_mode(GraphicsMode m) { return m >= GraphicsMode::Text; }
bool is_double_mode(GraphicsMode m) { return !!(static_cast<int>(m)&1); }
// Various soft-switch values.
bool alternative_character_set_ = false;
@ -179,6 +178,7 @@ class VideoBase {
// it carries on into the next if it's high resolution with
// the delay bit set.
mutable uint8_t graphics_carry_ = 0;
bool was_double_ = false;
// This holds a copy of the character ROM. The regular character
// set is assumed to be in the first 64*8 bytes; the alternative
@ -196,39 +196,33 @@ class VideoBase {
/*!
Outputs 40-column text to @c target, using @c length bytes from @c source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row) const;
void output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row) const;
/*!
Outputs 80-column text to @c target, drawing @c length columns from @c source and @c auxiliary_source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row) const;
void output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row) const;
/*!
Outputs 40-column low-resolution graphics to @c target, drawing @c length columns from @c source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int row) const;
void output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int column, int row) const;
/*!
Outputs 80-column low-resolution graphics to @c target, drawing @c length columns from @c source and @c auxiliary_source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int row) const;
void output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int column, int row) const;
/*!
Outputs 40-column high-resolution graphics to @c target, drawing @c length columns from @c source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_high_resolution(uint8_t *target, uint8_t *source, size_t length) const;
void output_high_resolution(uint8_t *target, uint8_t *source, size_t length) const;
/*!
Outputs 80-column double-high-resolution graphics to @c target, drawing @c length columns from @c source.
@return One byte after the final value written to @c target.
*/
uint8_t *output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length) const;
void output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length) const;
};
template <class BusHandler, bool is_iie> class Video: public VideoBase {
@ -310,82 +304,111 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
// TODO: should character modes be mapped to character pixel outputs here?
}
// The first 40 columns are submitted to the CRT only upon completion;
// they'll be either graphics or blank, depending on which side we are
// of line 192.
if(column_ < 40) {
if(row_ < 192) {
const int pixel_end = std::min(40, ending_column);
if(row_ < 192) {
// Output an initial 1.5 columns of blank. The pixel area will be the next 40.5
// columns; base contents remain where they would naturally be but auxiliary
// graphics appear to the left of that.
if(!column_) {
crt_->output_blank(14 + 7);
pixel_pointer_ = crt_->allocate_write_area(568);
graphics_carry_ = 0;
was_double_ = true;
}
if(column_ < 42 && ending_column > 2) {
const int pixel_start = std::max(2, column_) - 2;
const int pixel_end = std::min(42, ending_column) - 2;
const int pixel_row = row_ & 7;
const bool requires_high_density = line_mode != GraphicsMode::Text;
if(!column_ || requires_high_density != pixels_are_high_density_) {
if(column_) output_data_to_column(column_);
pixel_pointer_ = crt_->allocate_write_area(561);
pixel_pointer_column_ = column_;
pixels_are_high_density_ = requires_high_density;
graphics_carry_ = 0;
const bool is_double = Video::is_double_mode(line_mode);
if(!is_double && was_double_) {
pixel_pointer_[pixel_start*14 + 0] =
pixel_pointer_[pixel_start*14 + 1] =
pixel_pointer_[pixel_start*14 + 2] =
pixel_pointer_[pixel_start*14 + 3] =
pixel_pointer_[pixel_start*14 + 4] =
pixel_pointer_[pixel_start*14 + 5] =
pixel_pointer_[pixel_start*14 + 6] = 0;
}
was_double_ = is_double;
switch(line_mode) {
case GraphicsMode::Text:
pixel_pointer_ = output_text(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_),
output_text(
&pixel_pointer_[pixel_start * 14 + 7],
&base_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start),
static_cast<size_t>(pixel_row));
break;
case GraphicsMode::DoubleText:
pixel_pointer_ = output_double_text(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
&auxiliary_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_),
output_double_text(
&pixel_pointer_[pixel_start * 14],
&base_stream_[static_cast<size_t>(pixel_start)],
&auxiliary_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start),
static_cast<size_t>(pixel_row));
break;
case GraphicsMode::LowRes:
pixel_pointer_ = output_low_resolution(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_),
output_low_resolution(
&pixel_pointer_[pixel_start * 14 + 7],
&base_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start),
pixel_start,
pixel_row);
break;
case GraphicsMode::DoubleLowRes:
pixel_pointer_ = output_double_low_resolution(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
&auxiliary_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_),
output_double_low_resolution(
&pixel_pointer_[pixel_start * 14],
&base_stream_[static_cast<size_t>(pixel_start)],
&auxiliary_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start),
pixel_start,
pixel_row);
break;
case GraphicsMode::HighRes:
pixel_pointer_ = output_high_resolution(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_));
output_high_resolution(
&pixel_pointer_[pixel_start * 14 + 7],
&base_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start));
break;
case GraphicsMode::DoubleHighRes:
pixel_pointer_ = output_double_high_resolution(
pixel_pointer_,
&base_stream_[static_cast<size_t>(column_)],
&auxiliary_stream_[static_cast<size_t>(column_)],
static_cast<size_t>(pixel_end - column_));
output_double_high_resolution(
&pixel_pointer_[pixel_start * 14],
&base_stream_[static_cast<size_t>(pixel_start)],
&auxiliary_stream_[static_cast<size_t>(pixel_start)],
static_cast<size_t>(pixel_end - pixel_start));
break;
default: break;
}
if(ending_column >= 40) {
output_data_to_column(40);
}
} else {
if(ending_column >= 40) {
crt_->output_blank(560);
if(pixel_end == 40) {
if(was_double_) {
pixel_pointer_[563] =
pixel_pointer_[564] =
pixel_pointer_[565] =
pixel_pointer_[566] =
pixel_pointer_[567] = 0;
} else {
if(line_mode == GraphicsMode::HighRes && base_stream_[39]&0x80)
pixel_pointer_[567] = graphics_carry_;
else
pixel_pointer_[567] = 0;
}
crt_->output_data(568, 568);
pixel_pointer_ = nullptr;
}
}
} else {
if(column_ < 42 && ending_column >= 42) {
crt_->output_blank(589);
}
}
/*
@ -393,16 +416,12 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
there were pixels this row and is output as soon as it is known.
*/
const int first_blank_start = std::max(40, column_);
const int first_blank_end = std::min(first_sync_column, ending_column);
if(first_blank_end > first_blank_start) {
crt_->output_blank(static_cast<unsigned int>(first_blank_end - first_blank_start) * 14);
if(column_ < first_sync_column && ending_column >= first_sync_column) {
crt_->output_blank((first_sync_column - 42)*14 - 1);
}
const int sync_start = std::max(first_sync_column, column_);
const int sync_end = std::min(first_sync_column + sync_length, ending_column);
if(sync_end > sync_start) {
crt_->output_sync(static_cast<unsigned int>(sync_end - sync_start) * 14);
if(column_ < (first_sync_column + sync_length) && ending_column >= (first_sync_column + sync_length)) {
crt_->output_sync(sync_length*14);
}
int second_blank_start;
@ -413,9 +432,9 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
crt_->output_colour_burst(static_cast<unsigned int>(colour_burst_end - colour_burst_start) * 14, 128);
}
second_blank_start = std::max(first_sync_column + 7, column_);
second_blank_start = std::max(first_sync_column + sync_length + 3, column_);
} else {
second_blank_start = std::max(first_sync_column + 4, column_);
second_blank_start = std::max(first_sync_column + sync_length, column_);
}
if(ending_column > second_blank_start) {
@ -522,11 +541,6 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
}
BusHandler &bus_handler_;
void output_data_to_column(int column) {
int length = column - pixel_pointer_column_;
crt_->output_data(static_cast<unsigned int>(length*14), static_cast<unsigned int>(length * (pixels_are_high_density_ ? 14 : 7)));
pixel_pointer_ = nullptr;
}
};
}