mirror of
https://github.com/TomHarte/CLK.git
synced 2025-04-09 00:37:27 +00:00
Collapsed 6560 template to a more direct loop, albeit with quite a bit still left to fix.
This commit is contained in:
Thomas Harte
parent
12bad8f23f
commit
142774be37
@ -130,13 +130,196 @@ template <class T> class MOS6560 {
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*/
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inline void run_for_cycles(unsigned int number_of_cycles)
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{
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// keep track of the amount of time since the speaker was updated; lazy updates are applied
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_cycles_since_speaker_update += number_of_cycles;
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while(number_of_cycles--)
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{
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uint16_t address = get_address();
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// keep an old copy of the vertical count because that test is a cycle later than the actual changes
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int previous_vertical_counter = _vertical_counter;
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// keep track of internal time relative to this scanline
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_horizontal_counter++;
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_full_frame_counter++;
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if(_horizontal_counter == _timing.cycles_per_line)
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{
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if(_horizontal_drawing_latch)
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{
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_current_character_row++;
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if(
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(_current_character_row == 16) ||
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(_current_character_row == 8 && !_registers.tall_characters)
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) {
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_current_character_row = 0;
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_current_row++;
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}
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_pixel_line_cycle = -1;
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_columns_this_line = -1;
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_column_counter = -1;
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}
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_horizontal_counter = 0;
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_horizontal_drawing_latch = false;
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_vertical_counter ++;
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if(_vertical_counter == (_registers.interlaced ? (_is_odd_frame ? 262 : 263) : _timing.lines_per_progressive_field))
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{
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_vertical_counter = 0;
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_full_frame_counter = 0;
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_is_odd_frame ^= true;
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_current_row = 0;
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_rows_this_field = -1;
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_vertical_drawing_latch = false;
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_base_video_matrix_address_counter = 0;
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_current_character_row = 0;
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}
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}
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// check for vertical starting events
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_vertical_drawing_latch |= _registers.first_row_location == (previous_vertical_counter >> 1);
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_horizontal_drawing_latch |= _vertical_drawing_latch && (_horizontal_counter == _registers.first_column_location);
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if(_pixel_line_cycle >= 0) _pixel_line_cycle++;
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switch(_pixel_line_cycle)
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{
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case -1:
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if(_horizontal_drawing_latch)
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{
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_pixel_line_cycle = 0;
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_video_matrix_address_counter = _base_video_matrix_address_counter;
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}
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break;
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case 1: _columns_this_line = _registers.number_of_columns; break;
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case 2: if(_rows_this_field < 0) _rows_this_field = _registers.number_of_rows; break;
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case 3: if(_current_row < _rows_this_field) _column_counter = 0; break;
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}
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uint16_t fetch_address = 0x1c;
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if(_column_counter >= 0 && _column_counter < _columns_this_line*2)
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{
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if(_column_counter&1)
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{
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fetch_address = _registers.character_cell_start_address + (_character_code*(_registers.tall_characters ? 16 : 8)) + _current_character_row;
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}
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else
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{
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fetch_address = (uint16_t)(_registers.video_matrix_start_address + _video_matrix_address_counter);
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_video_matrix_address_counter++;
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if(
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(_current_character_row == 15) ||
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(_current_character_row == 7 && !_registers.tall_characters)
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) {
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_base_video_matrix_address_counter = _video_matrix_address_counter;
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}
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}
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}
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fetch_address &= 0x3fff;
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uint8_t pixel_data;
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uint8_t colour_data;
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static_cast<T *>(this)->perform_read(address, &pixel_data, &colour_data);
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set_graphics_value(pixel_data, colour_data);
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static_cast<T *>(this)->perform_read(fetch_address, &pixel_data, &colour_data);
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// TODO: there should be a further two-cycle delay on pixels being output; the reverse bit should
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// divide the byte it is set for 3:1 and then continue as usual.
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// determine output state; colour burst and sync timing are currently a guess
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if(_horizontal_counter > _timing.cycles_per_line-4) _this_state = State::ColourBurst;
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else if(_horizontal_counter > _timing.cycles_per_line-7) _this_state = State::Sync;
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else
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{
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_this_state = (_column_counter >= 0 && _column_counter < _columns_this_line*2) ? State::Pixels : State::Border;
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}
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// apply vertical sync
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if(
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(_vertical_counter < 3 && (_is_odd_frame || !_registers.interlaced)) ||
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(_registers.interlaced &&
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(
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(_vertical_counter == 0 && _horizontal_counter > 32) ||
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(_vertical_counter == 1) || (_vertical_counter == 2) ||
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(_vertical_counter == 3 && _horizontal_counter <= 32)
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)
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))
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_this_state = State::Sync;
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// update the CRT
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if(_this_state != _output_state)
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{
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switch(_output_state)
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{
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case State::Sync: _crt->output_sync(_cycles_in_state * 4); break;
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case State::ColourBurst: _crt->output_colour_burst(_cycles_in_state * 4, _is_odd_frame ? 128 : 0, 0); break;
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case State::Border: output_border(_cycles_in_state * 4); break;
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case State::Pixels: _crt->output_data(_cycles_in_state * 4, 1); break;
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}
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_output_state = _this_state;
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_cycles_in_state = 0;
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pixel_pointer = nullptr;
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if(_output_state == State::Pixels)
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{
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pixel_pointer = _crt->allocate_write_area(260);
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}
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}
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_cycles_in_state++;
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if(_this_state == State::Pixels)
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{
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if(_column_counter&1)
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{
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_character_value = pixel_data;
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if(pixel_pointer)
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{
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uint8_t cell_colour = _colours[_character_colour & 0x7];
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if(!(_character_colour&0x8))
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{
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uint8_t colours[2];
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if(_registers.invertedCells)
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{
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colours[0] = cell_colour;
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colours[1] = _registers.backgroundColour;
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}
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else
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{
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colours[0] = _registers.backgroundColour;
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colours[1] = cell_colour;
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}
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pixel_pointer[0] = colours[(_character_value >> 7)&1];
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pixel_pointer[1] = colours[(_character_value >> 6)&1];
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pixel_pointer[2] = colours[(_character_value >> 5)&1];
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pixel_pointer[3] = colours[(_character_value >> 4)&1];
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pixel_pointer[4] = colours[(_character_value >> 3)&1];
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pixel_pointer[5] = colours[(_character_value >> 2)&1];
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pixel_pointer[6] = colours[(_character_value >> 1)&1];
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pixel_pointer[7] = colours[(_character_value >> 0)&1];
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}
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else
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{
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uint8_t colours[4] = {_registers.backgroundColour, _registers.borderColour, cell_colour, _registers.auxiliary_colour};
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pixel_pointer[0] =
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pixel_pointer[1] = colours[(_character_value >> 6)&3];
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pixel_pointer[2] =
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pixel_pointer[3] = colours[(_character_value >> 4)&3];
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pixel_pointer[4] =
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pixel_pointer[5] = colours[(_character_value >> 2)&3];
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pixel_pointer[6] =
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pixel_pointer[7] = colours[(_character_value >> 0)&3];
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}
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pixel_pointer += 8;
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}
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}
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else
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{
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_character_code = pixel_data;
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_character_colour = colour_data;
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}
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_column_counter++;
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}
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}
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}
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@ -292,203 +475,6 @@ template <class T> class MOS6560 {
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int lines_per_progressive_field;
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bool supports_interlacing;
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} _timing;
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/*!
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Impliedly runs the 6560 for a single cycle, returning the next address that it puts on the bus.
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*/
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uint16_t get_address()
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{
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// keep track of the amount of time since the speaker was updated; lazy updates are applied
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_cycles_since_speaker_update++;
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// keep an old copy of the vertical count because that test is a cycle later than the actual changes
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int previous_vertical_counter = _vertical_counter;
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// keep track of internal time relative to this scanline
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_horizontal_counter++;
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_full_frame_counter++;
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if(_horizontal_counter == _timing.cycles_per_line)
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{
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if(_horizontal_drawing_latch)
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{
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_current_character_row++;
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if(
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(_current_character_row == 16) ||
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(_current_character_row == 8 && !_registers.tall_characters)
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) {
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_current_character_row = 0;
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_current_row++;
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}
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_pixel_line_cycle = -1;
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_columns_this_line = -1;
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_column_counter = -1;
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}
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_horizontal_counter = 0;
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_horizontal_drawing_latch = false;
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_vertical_counter ++;
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if(_vertical_counter == (_registers.interlaced ? (_is_odd_frame ? 262 : 263) : _timing.lines_per_progressive_field))
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{
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_vertical_counter = 0;
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_full_frame_counter = 0;
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_is_odd_frame ^= true;
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_current_row = 0;
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_rows_this_field = -1;
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_vertical_drawing_latch = false;
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_base_video_matrix_address_counter = 0;
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_current_character_row = 0;
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}
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}
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// check for vertical starting events
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_vertical_drawing_latch |= _registers.first_row_location == (previous_vertical_counter >> 1);
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_horizontal_drawing_latch |= _vertical_drawing_latch && (_horizontal_counter == _registers.first_column_location);
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if(_pixel_line_cycle >= 0) _pixel_line_cycle++;
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switch(_pixel_line_cycle)
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{
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case -1:
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if(_horizontal_drawing_latch)
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{
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_pixel_line_cycle = 0;
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_video_matrix_address_counter = _base_video_matrix_address_counter;
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}
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break;
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case 1: _columns_this_line = _registers.number_of_columns; break;
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case 2: if(_rows_this_field < 0) _rows_this_field = _registers.number_of_rows; break;
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case 3: if(_current_row < _rows_this_field) _column_counter = 0; break;
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}
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uint16_t fetch_address = 0x1c;
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if(_column_counter >= 0 && _column_counter < _columns_this_line*2)
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{
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if(_column_counter&1)
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{
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fetch_address = _registers.character_cell_start_address + (_character_code*(_registers.tall_characters ? 16 : 8)) + _current_character_row;
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}
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else
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{
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fetch_address = (uint16_t)(_registers.video_matrix_start_address + _video_matrix_address_counter);
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_video_matrix_address_counter++;
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if(
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(_current_character_row == 15) ||
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(_current_character_row == 7 && !_registers.tall_characters)
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) {
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_base_video_matrix_address_counter = _video_matrix_address_counter;
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}
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}
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}
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return fetch_address & 0x3fff;
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}
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/*!
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An owning machine should determine the state of the data bus as a result of the access implied
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by @c get_address and supply it to set_graphics_value.
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*/
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void set_graphics_value(uint8_t value, uint8_t colour_value)
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{
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// TODO: there should be a further two-cycle delay on pixels being output; the reverse bit should
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// divide the byte it is set for 3:1 and then continue as usual.
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// determine output state; colour burst and sync timing are currently a guess
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if(_horizontal_counter > _timing.cycles_per_line-4) _this_state = State::ColourBurst;
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else if(_horizontal_counter > _timing.cycles_per_line-7) _this_state = State::Sync;
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else
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{
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_this_state = (_column_counter >= 0 && _column_counter < _columns_this_line*2) ? State::Pixels : State::Border;
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}
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// apply vertical sync
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if(
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(_vertical_counter < 3 && (_is_odd_frame || !_registers.interlaced)) ||
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(_registers.interlaced &&
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(
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(_vertical_counter == 0 && _horizontal_counter > 32) ||
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(_vertical_counter == 1) || (_vertical_counter == 2) ||
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(_vertical_counter == 3 && _horizontal_counter <= 32)
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)
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))
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_this_state = State::Sync;
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// update the CRT
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if(_this_state != _output_state)
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{
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switch(_output_state)
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{
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case State::Sync: _crt->output_sync(_cycles_in_state * 4); break;
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case State::ColourBurst: _crt->output_colour_burst(_cycles_in_state * 4, _is_odd_frame ? 128 : 0, 0); break;
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case State::Border: output_border(_cycles_in_state * 4); break;
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case State::Pixels: _crt->output_data(_cycles_in_state * 4, 1); break;
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}
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_output_state = _this_state;
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_cycles_in_state = 0;
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pixel_pointer = nullptr;
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if(_output_state == State::Pixels)
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{
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pixel_pointer = _crt->allocate_write_area(260);
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}
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}
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_cycles_in_state++;
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if(_this_state == State::Pixels)
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{
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if(_column_counter&1)
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{
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_character_value = value;
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if(pixel_pointer)
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{
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uint8_t cell_colour = _colours[_character_colour & 0x7];
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if(!(_character_colour&0x8))
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{
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uint8_t colours[2];
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if(_registers.invertedCells)
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{
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colours[0] = cell_colour;
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colours[1] = _registers.backgroundColour;
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}
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else
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{
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colours[0] = _registers.backgroundColour;
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colours[1] = cell_colour;
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}
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pixel_pointer[0] = colours[(_character_value >> 7)&1];
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pixel_pointer[1] = colours[(_character_value >> 6)&1];
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pixel_pointer[2] = colours[(_character_value >> 5)&1];
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pixel_pointer[3] = colours[(_character_value >> 4)&1];
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pixel_pointer[4] = colours[(_character_value >> 3)&1];
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pixel_pointer[5] = colours[(_character_value >> 2)&1];
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pixel_pointer[6] = colours[(_character_value >> 1)&1];
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pixel_pointer[7] = colours[(_character_value >> 0)&1];
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}
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else
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{
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uint8_t colours[4] = {_registers.backgroundColour, _registers.borderColour, cell_colour, _registers.auxiliary_colour};
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pixel_pointer[0] =
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pixel_pointer[1] = colours[(_character_value >> 6)&3];
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pixel_pointer[2] =
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pixel_pointer[3] = colours[(_character_value >> 4)&3];
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pixel_pointer[4] =
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pixel_pointer[5] = colours[(_character_value >> 2)&3];
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pixel_pointer[6] =
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pixel_pointer[7] = colours[(_character_value >> 0)&3];
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}
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pixel_pointer += 8;
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}
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}
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else
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{
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_character_code = value;
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_character_colour = colour_value;
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}
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_column_counter++;
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}
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}
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};
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}
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@ -227,7 +227,7 @@ class Tape: public Storage::TapePlayer {
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class Vic6560: public MOS::MOS6560<Vic6560> {
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public:
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void perform_read(uint16_t address, uint8_t *pixel_data, uint8_t *colour_data)
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inline void perform_read(uint16_t address, uint8_t *pixel_data, uint8_t *colour_data)
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{
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*pixel_data = _videoMemoryMap[address >> 10] ? _videoMemoryMap[address >> 10][address & 0x3ff] : 0xff; // TODO
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*colour_data = _colorMemory[address & 0x03ff];
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