diff --git a/Components/6560/6560.hpp b/Components/6560/6560.hpp index 1f463f305..f90a4792e 100644 --- a/Components/6560/6560.hpp +++ b/Components/6560/6560.hpp @@ -125,6 +125,174 @@ template class MOS6560 { } } + /*! + Runs for cycles. Derr. + */ + inline void run_for_cycles(unsigned int number_of_cycles) + { + while(number_of_cycles--) + { + uint16_t address = get_address(); + uint8_t pixel_data; + uint8_t colour_data; + static_cast(this)->perform_read(address, &pixel_data, &colour_data); + set_graphics_value(pixel_data, colour_data); + } + } + + /*! + Causes the 6560 to flush as much pending CRT and speaker communications as possible. + */ + inline void synchronise() { update_audio(); } + + /*! + Writes to a 6560 register. + */ + void set_register(int address, uint8_t value) + { + address &= 0xf; + _registers.direct_values[address] = value; + switch(address) + { + case 0x0: + _registers.interlaced = !!(value&0x80) && _timing.supports_interlacing; + _registers.first_column_location = value & 0x7f; + break; + + case 0x1: + _registers.first_row_location = value; + break; + + case 0x2: + _registers.number_of_columns = value & 0x7f; + _registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x3c00) | ((value & 0x80) << 2)); + break; + + case 0x3: + _registers.number_of_rows = (value >> 1)&0x3f; + _registers.tall_characters = !!(value&0x01); + break; + + case 0x5: + _registers.character_cell_start_address = (uint16_t)((value & 0x0f) << 10); + _registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6)); + break; + + case 0xa: + case 0xb: + case 0xc: + case 0xd: + update_audio(); + _speaker->set_control(address - 0xa, value); + break; + + case 0xe: + update_audio(); + _registers.auxiliary_colour = _colours[value >> 4]; + _speaker->set_volume(value & 0xf); + break; + + case 0xf: + { + uint8_t new_border_colour = _colours[value & 0x07]; + if(_this_state == State::Border && new_border_colour != _registers.borderColour) + { + output_border(_cycles_in_state * 4); + _cycles_in_state = 0; + } + _registers.invertedCells = !((value >> 3)&1); + _registers.borderColour = new_border_colour; + _registers.backgroundColour = _colours[value >> 4]; + } + break; + + // TODO: the lightpen, etc + + default: + break; + } + } + + /* + Reads from a 6560 register. + */ + uint8_t get_register(int address) + { + address &= 0xf; + int current_line = (_full_frame_counter + _timing.line_counter_increment_offset) / _timing.cycles_per_line; + switch(address) + { + default: return _registers.direct_values[address]; + case 0x03: return (uint8_t)(current_line << 7) | (_registers.direct_values[3] & 0x7f); + case 0x04: return (current_line >> 1) & 0xff; + } + } + + private: + std::shared_ptr _crt; + + std::shared_ptr _speaker; + unsigned int _cycles_since_speaker_update; + void update_audio() + { + _speaker->run_for_cycles(_cycles_since_speaker_update >> 2); + _cycles_since_speaker_update &= 3; + } + + // register state + struct { + bool interlaced, tall_characters; + uint8_t first_column_location, first_row_location; + uint8_t number_of_columns, number_of_rows; + uint16_t character_cell_start_address, video_matrix_start_address; + uint8_t backgroundColour, borderColour, auxiliary_colour; + bool invertedCells; + + uint8_t direct_values[16]; + } _registers; + + // output state + enum State { + Sync, ColourBurst, Border, Pixels + } _this_state, _output_state; + unsigned int _cycles_in_state; + + // counters that cover an entire field + int _horizontal_counter, _vertical_counter, _full_frame_counter; + + // latches dictating start and length of drawing + bool _vertical_drawing_latch, _horizontal_drawing_latch; + int _rows_this_field, _columns_this_line; + + // current drawing position counter + int _pixel_line_cycle, _column_counter; + int _current_row; + uint16_t _current_character_row; + uint16_t _video_matrix_address_counter, _base_video_matrix_address_counter; + + // data latched from the bus + uint8_t _character_code, _character_colour, _character_value; + + bool _is_odd_frame; + + // lookup table from 6560 colour index to appropriate PAL/NTSC value + uint8_t _colours[16]; + + uint8_t *pixel_pointer; + void output_border(unsigned int number_of_cycles) + { + uint8_t *colour_pointer = _crt->allocate_write_area(1); + if(colour_pointer) *colour_pointer = _registers.borderColour; + _crt->output_level(number_of_cycles); + } + + struct { + int cycles_per_line; + int line_counter_increment_offset; + int lines_per_progressive_field; + bool supports_interlacing; + } _timing; + /*! Impliedly runs the 6560 for a single cycle, returning the next address that it puts on the bus. */ @@ -321,159 +489,6 @@ template class MOS6560 { _column_counter++; } } - - /*! - Causes the 6560 to flush as much pending CRT and speaker communications as possible. - */ - inline void synchronise() { update_audio(); } - - /*! - Writes to a 6560 register. - */ - void set_register(int address, uint8_t value) - { - address &= 0xf; - _registers.direct_values[address] = value; - switch(address) - { - case 0x0: - _registers.interlaced = !!(value&0x80) && _timing.supports_interlacing; - _registers.first_column_location = value & 0x7f; - break; - - case 0x1: - _registers.first_row_location = value; - break; - - case 0x2: - _registers.number_of_columns = value & 0x7f; - _registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x3c00) | ((value & 0x80) << 2)); - break; - - case 0x3: - _registers.number_of_rows = (value >> 1)&0x3f; - _registers.tall_characters = !!(value&0x01); - break; - - case 0x5: - _registers.character_cell_start_address = (uint16_t)((value & 0x0f) << 10); - _registers.video_matrix_start_address = (uint16_t)((_registers.video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6)); - break; - - case 0xa: - case 0xb: - case 0xc: - case 0xd: - update_audio(); - _speaker->set_control(address - 0xa, value); - break; - - case 0xe: - update_audio(); - _registers.auxiliary_colour = _colours[value >> 4]; - _speaker->set_volume(value & 0xf); - break; - - case 0xf: - { - uint8_t new_border_colour = _colours[value & 0x07]; - if(_this_state == State::Border && new_border_colour != _registers.borderColour) - { - output_border(_cycles_in_state * 4); - _cycles_in_state = 0; - } - _registers.invertedCells = !((value >> 3)&1); - _registers.borderColour = new_border_colour; - _registers.backgroundColour = _colours[value >> 4]; - } - break; - - // TODO: the lightpen, etc - - default: - break; - } - } - - /* - Reads from a 6560 register. - */ - uint8_t get_register(int address) - { - address &= 0xf; - int current_line = (_full_frame_counter + _timing.line_counter_increment_offset) / _timing.cycles_per_line; - switch(address) - { - default: return _registers.direct_values[address]; - case 0x03: return (uint8_t)(current_line << 7) | (_registers.direct_values[3] & 0x7f); - case 0x04: return (current_line >> 1) & 0xff; - } - } - - private: - std::shared_ptr _crt; - - std::shared_ptr _speaker; - unsigned int _cycles_since_speaker_update; - void update_audio() - { - _speaker->run_for_cycles(_cycles_since_speaker_update >> 2); - _cycles_since_speaker_update &= 3; - } - - // register state - struct { - bool interlaced, tall_characters; - uint8_t first_column_location, first_row_location; - uint8_t number_of_columns, number_of_rows; - uint16_t character_cell_start_address, video_matrix_start_address; - uint8_t backgroundColour, borderColour, auxiliary_colour; - bool invertedCells; - - uint8_t direct_values[16]; - } _registers; - - // output state - enum State { - Sync, ColourBurst, Border, Pixels - } _this_state, _output_state; - unsigned int _cycles_in_state; - - // counters that cover an entire field - int _horizontal_counter, _vertical_counter, _full_frame_counter; - - // latches dictating start and length of drawing - bool _vertical_drawing_latch, _horizontal_drawing_latch; - int _rows_this_field, _columns_this_line; - - // current drawing position counter - int _pixel_line_cycle, _column_counter; - int _current_row; - uint16_t _current_character_row; - uint16_t _video_matrix_address_counter, _base_video_matrix_address_counter; - - // data latched from the bus - uint8_t _character_code, _character_colour, _character_value; - - bool _is_odd_frame; - - // lookup table from 6560 colour index to appropriate PAL/NTSC value - uint8_t _colours[16]; - - uint8_t *pixel_pointer; - void output_border(unsigned int number_of_cycles) - { - uint8_t *colour_pointer = _crt->allocate_write_area(1); - if(colour_pointer) *colour_pointer = _registers.borderColour; - _crt->output_level(number_of_cycles); - } - - struct { - int cycles_per_line; - int line_counter_increment_offset; - int lines_per_progressive_field; - bool supports_interlacing; - } _timing; }; } diff --git a/Machines/Commodore/Vic-20/Vic20.cpp b/Machines/Commodore/Vic-20/Vic20.cpp index dc05075cb..097d63cfe 100644 --- a/Machines/Commodore/Vic-20/Vic20.cpp +++ b/Machines/Commodore/Vic-20/Vic20.cpp @@ -35,14 +35,9 @@ Machine::Machine() : _tape.set_delegate(this); // establish the memory maps - memset(_videoMemoryMap, 0, sizeof(_videoMemoryMap)); memset(_processorReadMemoryMap, 0, sizeof(_processorReadMemoryMap)); memset(_processorWriteMemoryMap, 0, sizeof(_processorWriteMemoryMap)); - write_to_map(_videoMemoryMap, _characterROM, 0x0000, sizeof(_characterROM)); - write_to_map(_videoMemoryMap, _userBASICMemory, 0x2000, sizeof(_userBASICMemory)); - write_to_map(_videoMemoryMap, _screenMemory, 0x3000, sizeof(_screenMemory)); - write_to_map(_processorReadMemoryMap, _userBASICMemory, 0x0000, sizeof(_userBASICMemory)); write_to_map(_processorReadMemoryMap, _screenMemory, 0x1000, sizeof(_screenMemory)); write_to_map(_processorReadMemoryMap, _colorMemory, 0x9400, sizeof(_colorMemory)); @@ -86,9 +81,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin // } // run the phase-1 part of this cycle, in which the VIC accesses memory - uint16_t video_address = _mos6560->get_address(); - uint8_t video_value = _videoMemoryMap[video_address >> 10] ? _videoMemoryMap[video_address >> 10][video_address & 0x3ff] : 0xff; // TODO - _mos6560->set_graphics_value(video_value, _colorMemory[video_address & 0x03ff]); + _mos6560->run_for_cycles(1); // run the phase-2 part of the cycle, which is whatever the 6502 said it should be if(isReadOperation(operation)) @@ -151,6 +144,12 @@ void Machine::mos6522_did_change_interrupt_status(void *mos6522) void Machine::setup_output(float aspect_ratio) { _mos6560.reset(new Vic6560()); + + memset(_mos6560->_videoMemoryMap, 0, sizeof(_mos6560->_videoMemoryMap)); + write_to_map(_mos6560->_videoMemoryMap, _characterROM, 0x0000, sizeof(_characterROM)); + write_to_map(_mos6560->_videoMemoryMap, _userBASICMemory, 0x2000, sizeof(_userBASICMemory)); + write_to_map(_mos6560->_videoMemoryMap, _screenMemory, 0x3000, sizeof(_screenMemory)); + _mos6560->_colorMemory = _colorMemory; } void Machine::close_output() diff --git a/Machines/Commodore/Vic-20/Vic20.hpp b/Machines/Commodore/Vic-20/Vic20.hpp index e51c5b8f0..292f655eb 100644 --- a/Machines/Commodore/Vic-20/Vic20.hpp +++ b/Machines/Commodore/Vic-20/Vic20.hpp @@ -225,7 +225,17 @@ class Tape: public Storage::TapePlayer { bool _input_level; }; -class Vic6560: public MOS::MOS6560 {}; +class Vic6560: public MOS::MOS6560 { + public: + void perform_read(uint16_t address, uint8_t *pixel_data, uint8_t *colour_data) + { + *pixel_data = _videoMemoryMap[address >> 10] ? _videoMemoryMap[address >> 10][address & 0x3ff] : 0xff; // TODO + *colour_data = _colorMemory[address & 0x03ff]; + } + + uint8_t *_videoMemoryMap[16]; + uint8_t *_colorMemory; +}; class Machine: public CPU6502::Processor, @@ -291,7 +301,6 @@ class Machine: uint8_t _junkMemory[0x0400]; std::unique_ptr _driveROM; - uint8_t *_videoMemoryMap[16]; uint8_t *_processorReadMemoryMap[64]; uint8_t *_processorWriteMemoryMap[64]; void write_to_map(uint8_t **map, uint8_t *area, uint16_t address, uint16_t length); diff --git a/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib b/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib index 9cd3153db..cd45e6cb1 100644 --- a/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib +++ b/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib @@ -46,8 +46,8 @@ - - + +