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Moves memory collection into a separate loop.

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This commit is contained in:
Thomas Harte 2018-08-18 21:54:24 -04:00
parent 33576aa2c4
commit 4209f0e044
1 changed files with 35 additions and 22 deletions
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57
Machines/AppleII/Video.hpp
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@ -278,11 +278,46 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
} else { } else {
const GraphicsMode line_mode = graphics_mode(row_); const GraphicsMode line_mode = graphics_mode(row_);
// Determine whether there's any fetching to do. Fetching occurs during the first
// 40 columns of rows prior to 192.
if(row_ < 192 && column_ < 40) {
const int character_row = row_ >> 3;
const uint16_t row_address = static_cast<uint16_t>((character_row >> 3) * 40 + ((character_row&7) << 7));
// Grab the memory contents that'll be needed momentarily.
const int fetch_end = std::min(40, ending_column);
uint16_t fetch_address;
switch(line_mode) {
case GraphicsMode::Text:
case GraphicsMode::DoubleText:
case GraphicsMode::LowRes:
case GraphicsMode::DoubleLowRes: {
const uint16_t text_address = static_cast<uint16_t>(((video_page()+1) * 0x400) + row_address);
fetch_address = static_cast<uint16_t>(text_address + column_);
} break;
case GraphicsMode::HighRes:
case GraphicsMode::DoubleHighRes:
fetch_address = static_cast<uint16_t>(((video_page()+1) * 0x2000) + row_address + ((row_&7) << 10) + column_);
break;
}
bus_handler_.perform_read(
fetch_address,
static_cast<size_t>(fetch_end - column_),
&base_stream_[static_cast<size_t>(column_)],
&auxiliary_stream_[static_cast<size_t>(column_)]);
// TODO: should character modes be mapped to character pixel outputs here?
}
// The first 40 columns are submitted to the CRT only upon completion; // 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 // they'll be either graphics or blank, depending on which side we are
// of line 192. // of line 192.
if(column_ < 40) { if(column_ < 40) {
if(row_ < 192) { if(row_ < 192) {
const int pixel_end = std::min(40, ending_column);
const int pixel_row = row_ & 7;
const bool requires_high_density = line_mode != GraphicsMode::Text; const bool requires_high_density = line_mode != GraphicsMode::Text;
if(!column_ || requires_high_density != pixels_are_high_density_) { if(!column_ || requires_high_density != pixels_are_high_density_) {
if(column_) output_data_to_column(column_); if(column_) output_data_to_column(column_);
@ -292,28 +327,6 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
graphics_carry_ = 0; graphics_carry_ = 0;
} }
const int pixel_end = std::min(40, ending_column);
const int character_row = row_ >> 3;
const int pixel_row = row_ & 7;
const uint16_t row_address = static_cast<uint16_t>((character_row >> 3) * 40 + ((character_row&7) << 7));
const uint16_t text_address = static_cast<uint16_t>(((video_page()+1) * 0x400) + row_address);
// Grab the memory contents that'll be needed momentarily.
switch(line_mode) {
case GraphicsMode::Text:
case GraphicsMode::DoubleText:
case GraphicsMode::LowRes:
case GraphicsMode::DoubleLowRes:
bus_handler_.perform_read(text_address + column_, pixel_end - column_, &base_stream_[column_], &auxiliary_stream_[column_]);
// TODO: should character modes be mapped to character pixel outputs here?
break;
case GraphicsMode::HighRes:
case GraphicsMode::DoubleHighRes:
bus_handler_.perform_read(static_cast<uint16_t>(((video_page()+1) * 0x2000) + row_address + ((pixel_row&7) << 10)) + column_, pixel_end - column_, &base_stream_[column_], &auxiliary_stream_[column_]);
break;
}
switch(line_mode) { switch(line_mode) {
case GraphicsMode::Text: case GraphicsMode::Text:
pixel_pointer_ = output_text( pixel_pointer_ = output_text(