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While being lazy with types, implement 4/5/6/7 fetching.

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This commit is contained in:
Thomas Harte 2023-01-24 13:15:00 -05:00
parent 63bd0f918d
commit f8b42d4107
1 changed files with 31 additions and 4 deletions
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35
Components/9918/Implementation/Fetch.hpp
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@ -469,6 +469,9 @@ template<bool use_end> void Base<personality>::fetch_sms(LineBuffer &line_buffer
template <Personality personality>
template<ScreenMode mode> void Base<personality>::fetch_yamaha([[maybe_unused]] LineBuffer &line_buffer, [[maybe_unused]] int y, int end) {
const int rotated_name_ = pattern_name_address_ >> 1;
const uint8_t *const ram2 = &ram_[65536];
while(Storage<personality>::next_event_->offset < end) {
switch(Storage<personality>::next_event_->type) {
case Storage<personality>::Event::Type::External:
@ -478,16 +481,40 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha([[maybe_unused]]
case Storage<personality>::Event::Type::DataBlock: {
// Exactly how to fetch depends upon mode...
switch(mode) {
case ScreenMode::YamahaGraphics4:
case ScreenMode::YamahaGraphics5: {
// TODO: work out start address as a function of fetch_pointer_.row, use current
// data block via data_block_, fetch data into line_buffers_[fetch_pointer_.row].bitmap.
const int column = Storage<personality>::data_block_;
Storage<personality>::data_block_ += 4;
const int start = (y << 7) | column | 0x1'8000;
line_buffer.bitmap[column + 0] = ram_[pattern_name_address_ & (start + 0)];
line_buffer.bitmap[column + 1] = ram_[pattern_name_address_ & (start + 1)];
line_buffer.bitmap[column + 2] = ram_[pattern_name_address_ & (start + 2)];
line_buffer.bitmap[column + 3] = ram_[pattern_name_address_ & (start + 3)];
} break;
case ScreenMode::YamahaGraphics6:
case ScreenMode::YamahaGraphics7: {
const int column = Storage<personality>::data_block_ << 1;
Storage<personality>::data_block_ += 4;
const int start = (y << 7) | column | 0x1'8000;
// Fetch from alternate banks.
line_buffer.bitmap[column + 0] = ram_[rotated_name_ & (start + 0)];
line_buffer.bitmap[column + 1] = ram2[rotated_name_ & (start + 0)];
line_buffer.bitmap[column + 2] = ram_[rotated_name_ & (start + 1)];
line_buffer.bitmap[column + 3] = ram2[rotated_name_ & (start + 1)];
line_buffer.bitmap[column + 4] = ram_[rotated_name_ & (start + 2)];
line_buffer.bitmap[column + 5] = ram2[rotated_name_ & (start + 2)];
line_buffer.bitmap[column + 6] = ram_[rotated_name_ & (start + 3)];
line_buffer.bitmap[column + 7] = ram2[rotated_name_ & (start + 3)];
} break;
default:
break;
}
++Storage<personality>::data_block_;
} break;
default: break;