mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-27 01:31:42 +00:00
Turned the 6560 into an ordinary template, similar to the rest of the project, albeit right now with a fairly shonky internal implementation. Fixed a Mac-specific interface sizing issue.
This commit is contained in:
Thomas Harte
parent
285a288c80
commit
12bad8f23f
@ -125,6 +125,174 @@ template <class T> class MOS6560 {
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}
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}
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/*!
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Runs for cycles. Derr.
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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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while(number_of_cycles--)
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{
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uint16_t address = get_address();
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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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}
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}
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/*!
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Causes the 6560 to flush as much pending CRT and speaker communications as possible.
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*/
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inline void synchronise() { update_audio(); }
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/*!
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Writes to a 6560 register.
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*/
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void set_register(int address, uint8_t value)
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{
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address &= 0xf;
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_registers.direct_values[address] = value;
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switch(address)
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{
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case 0x0:
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_registers.interlaced = !!(value&0x80) && _timing.supports_interlacing;
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_registers.first_column_location = value & 0x7f;
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break;
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case 0x1:
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_registers.first_row_location = value;
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break;
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case 0x2:
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_registers.number_of_columns = value & 0x7f;
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_registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x3c00) | ((value & 0x80) << 2));
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break;
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case 0x3:
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_registers.number_of_rows = (value >> 1)&0x3f;
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_registers.tall_characters = !!(value&0x01);
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break;
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case 0x5:
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_registers.character_cell_start_address = (uint16_t)((value & 0x0f) << 10);
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_registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6));
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break;
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case 0xa:
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case 0xb:
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case 0xc:
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case 0xd:
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update_audio();
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_speaker->set_control(address - 0xa, value);
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break;
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case 0xe:
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update_audio();
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_registers.auxiliary_colour = _colours[value >> 4];
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_speaker->set_volume(value & 0xf);
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break;
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case 0xf:
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{
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uint8_t new_border_colour = _colours[value & 0x07];
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if(_this_state == State::Border && new_border_colour != _registers.borderColour)
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{
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output_border(_cycles_in_state * 4);
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_cycles_in_state = 0;
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}
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_registers.invertedCells = !((value >> 3)&1);
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_registers.borderColour = new_border_colour;
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_registers.backgroundColour = _colours[value >> 4];
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}
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break;
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// TODO: the lightpen, etc
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default:
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break;
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}
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}
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/*
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Reads from a 6560 register.
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*/
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uint8_t get_register(int address)
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{
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address &= 0xf;
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int current_line = (_full_frame_counter + _timing.line_counter_increment_offset) / _timing.cycles_per_line;
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switch(address)
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{
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default: return _registers.direct_values[address];
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case 0x03: return (uint8_t)(current_line << 7) | (_registers.direct_values[3] & 0x7f);
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case 0x04: return (current_line >> 1) & 0xff;
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}
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}
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private:
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std::shared_ptr<Outputs::CRT::CRT> _crt;
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std::shared_ptr<Speaker> _speaker;
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unsigned int _cycles_since_speaker_update;
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void update_audio()
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{
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_speaker->run_for_cycles(_cycles_since_speaker_update >> 2);
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_cycles_since_speaker_update &= 3;
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}
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// register state
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struct {
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bool interlaced, tall_characters;
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uint8_t first_column_location, first_row_location;
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uint8_t number_of_columns, number_of_rows;
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uint16_t character_cell_start_address, video_matrix_start_address;
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uint8_t backgroundColour, borderColour, auxiliary_colour;
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bool invertedCells;
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uint8_t direct_values[16];
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} _registers;
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// output state
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enum State {
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Sync, ColourBurst, Border, Pixels
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} _this_state, _output_state;
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unsigned int _cycles_in_state;
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// counters that cover an entire field
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int _horizontal_counter, _vertical_counter, _full_frame_counter;
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// latches dictating start and length of drawing
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bool _vertical_drawing_latch, _horizontal_drawing_latch;
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int _rows_this_field, _columns_this_line;
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// current drawing position counter
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int _pixel_line_cycle, _column_counter;
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int _current_row;
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uint16_t _current_character_row;
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uint16_t _video_matrix_address_counter, _base_video_matrix_address_counter;
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// data latched from the bus
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uint8_t _character_code, _character_colour, _character_value;
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bool _is_odd_frame;
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// lookup table from 6560 colour index to appropriate PAL/NTSC value
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uint8_t _colours[16];
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uint8_t *pixel_pointer;
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void output_border(unsigned int number_of_cycles)
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{
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uint8_t *colour_pointer = _crt->allocate_write_area(1);
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if(colour_pointer) *colour_pointer = _registers.borderColour;
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_crt->output_level(number_of_cycles);
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}
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struct {
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int cycles_per_line;
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int line_counter_increment_offset;
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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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@ -321,159 +489,6 @@ template <class T> class MOS6560 {
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_column_counter++;
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}
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}
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/*!
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Causes the 6560 to flush as much pending CRT and speaker communications as possible.
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*/
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inline void synchronise() { update_audio(); }
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/*!
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Writes to a 6560 register.
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*/
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void set_register(int address, uint8_t value)
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{
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address &= 0xf;
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_registers.direct_values[address] = value;
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switch(address)
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{
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case 0x0:
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_registers.interlaced = !!(value&0x80) && _timing.supports_interlacing;
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_registers.first_column_location = value & 0x7f;
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break;
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case 0x1:
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_registers.first_row_location = value;
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break;
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case 0x2:
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_registers.number_of_columns = value & 0x7f;
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_registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x3c00) | ((value & 0x80) << 2));
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break;
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case 0x3:
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_registers.number_of_rows = (value >> 1)&0x3f;
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_registers.tall_characters = !!(value&0x01);
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break;
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case 0x5:
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_registers.character_cell_start_address = (uint16_t)((value & 0x0f) << 10);
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_registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6));
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break;
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case 0xa:
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case 0xb:
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case 0xc:
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case 0xd:
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update_audio();
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_speaker->set_control(address - 0xa, value);
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break;
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case 0xe:
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update_audio();
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_registers.auxiliary_colour = _colours[value >> 4];
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_speaker->set_volume(value & 0xf);
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break;
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case 0xf:
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{
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uint8_t new_border_colour = _colours[value & 0x07];
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if(_this_state == State::Border && new_border_colour != _registers.borderColour)
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{
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output_border(_cycles_in_state * 4);
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_cycles_in_state = 0;
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}
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_registers.invertedCells = !((value >> 3)&1);
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_registers.borderColour = new_border_colour;
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_registers.backgroundColour = _colours[value >> 4];
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}
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break;
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// TODO: the lightpen, etc
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default:
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break;
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}
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}
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/*
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Reads from a 6560 register.
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*/
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uint8_t get_register(int address)
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{
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address &= 0xf;
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int current_line = (_full_frame_counter + _timing.line_counter_increment_offset) / _timing.cycles_per_line;
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switch(address)
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{
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default: return _registers.direct_values[address];
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case 0x03: return (uint8_t)(current_line << 7) | (_registers.direct_values[3] & 0x7f);
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case 0x04: return (current_line >> 1) & 0xff;
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}
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}
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private:
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std::shared_ptr<Outputs::CRT::CRT> _crt;
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std::shared_ptr<Speaker> _speaker;
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unsigned int _cycles_since_speaker_update;
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void update_audio()
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{
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_speaker->run_for_cycles(_cycles_since_speaker_update >> 2);
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_cycles_since_speaker_update &= 3;
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}
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// register state
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struct {
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bool interlaced, tall_characters;
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uint8_t first_column_location, first_row_location;
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uint8_t number_of_columns, number_of_rows;
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uint16_t character_cell_start_address, video_matrix_start_address;
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uint8_t backgroundColour, borderColour, auxiliary_colour;
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bool invertedCells;
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uint8_t direct_values[16];
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} _registers;
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// output state
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enum State {
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Sync, ColourBurst, Border, Pixels
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} _this_state, _output_state;
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unsigned int _cycles_in_state;
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// counters that cover an entire field
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int _horizontal_counter, _vertical_counter, _full_frame_counter;
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// latches dictating start and length of drawing
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bool _vertical_drawing_latch, _horizontal_drawing_latch;
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int _rows_this_field, _columns_this_line;
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// current drawing position counter
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int _pixel_line_cycle, _column_counter;
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int _current_row;
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uint16_t _current_character_row;
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uint16_t _video_matrix_address_counter, _base_video_matrix_address_counter;
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// data latched from the bus
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uint8_t _character_code, _character_colour, _character_value;
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bool _is_odd_frame;
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// lookup table from 6560 colour index to appropriate PAL/NTSC value
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uint8_t _colours[16];
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uint8_t *pixel_pointer;
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void output_border(unsigned int number_of_cycles)
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{
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uint8_t *colour_pointer = _crt->allocate_write_area(1);
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if(colour_pointer) *colour_pointer = _registers.borderColour;
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_crt->output_level(number_of_cycles);
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}
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struct {
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int cycles_per_line;
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int line_counter_increment_offset;
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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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}
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@ -35,14 +35,9 @@ Machine::Machine() :
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_tape.set_delegate(this);
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// establish the memory maps
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memset(_videoMemoryMap, 0, sizeof(_videoMemoryMap));
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memset(_processorReadMemoryMap, 0, sizeof(_processorReadMemoryMap));
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memset(_processorWriteMemoryMap, 0, sizeof(_processorWriteMemoryMap));
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write_to_map(_videoMemoryMap, _characterROM, 0x0000, sizeof(_characterROM));
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write_to_map(_videoMemoryMap, _userBASICMemory, 0x2000, sizeof(_userBASICMemory));
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write_to_map(_videoMemoryMap, _screenMemory, 0x3000, sizeof(_screenMemory));
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write_to_map(_processorReadMemoryMap, _userBASICMemory, 0x0000, sizeof(_userBASICMemory));
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write_to_map(_processorReadMemoryMap, _screenMemory, 0x1000, sizeof(_screenMemory));
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write_to_map(_processorReadMemoryMap, _colorMemory, 0x9400, sizeof(_colorMemory));
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@ -86,9 +81,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
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// }
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// run the phase-1 part of this cycle, in which the VIC accesses memory
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uint16_t video_address = _mos6560->get_address();
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uint8_t video_value = _videoMemoryMap[video_address >> 10] ? _videoMemoryMap[video_address >> 10][video_address & 0x3ff] : 0xff; // TODO
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_mos6560->set_graphics_value(video_value, _colorMemory[video_address & 0x03ff]);
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_mos6560->run_for_cycles(1);
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// run the phase-2 part of the cycle, which is whatever the 6502 said it should be
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if(isReadOperation(operation))
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@ -151,6 +144,12 @@ void Machine::mos6522_did_change_interrupt_status(void *mos6522)
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void Machine::setup_output(float aspect_ratio)
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{
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_mos6560.reset(new Vic6560());
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memset(_mos6560->_videoMemoryMap, 0, sizeof(_mos6560->_videoMemoryMap));
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write_to_map(_mos6560->_videoMemoryMap, _characterROM, 0x0000, sizeof(_characterROM));
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write_to_map(_mos6560->_videoMemoryMap, _userBASICMemory, 0x2000, sizeof(_userBASICMemory));
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write_to_map(_mos6560->_videoMemoryMap, _screenMemory, 0x3000, sizeof(_screenMemory));
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_mos6560->_colorMemory = _colorMemory;
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}
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void Machine::close_output()
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@ -225,7 +225,17 @@ class Tape: public Storage::TapePlayer {
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bool _input_level;
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};
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class Vic6560: public MOS::MOS6560<Vic6560> {};
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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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{
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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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}
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uint8_t *_videoMemoryMap[16];
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uint8_t *_colorMemory;
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};
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class Machine:
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public CPU6502::Processor<Machine>,
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@ -291,7 +301,6 @@ class Machine:
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uint8_t _junkMemory[0x0400];
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std::unique_ptr<uint8_t> _driveROM;
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uint8_t *_videoMemoryMap[16];
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uint8_t *_processorReadMemoryMap[64];
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uint8_t *_processorWriteMemoryMap[64];
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void write_to_map(uint8_t **map, uint8_t *area, uint16_t address, uint16_t length);
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@ -46,8 +46,8 @@
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<windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
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<rect key="contentRect" x="83" y="102" width="200" height="103"/>
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<rect key="screenRect" x="0.0" y="0.0" width="1366" height="768"/>
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<value key="minSize" type="size" width="200" height="83"/>
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<value key="maxSize" type="size" width="200" height="83"/>
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<value key="minSize" type="size" width="200" height="103"/>
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<value key="maxSize" type="size" width="200" height="103"/>
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<view key="contentView" id="7Pv-WL-2Rq">
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<rect key="frame" x="0.0" y="0.0" width="200" height="103"/>
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<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
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