Reading php terminal-gameboy-emulator

1. Reading php-terminal-gameboy-emulator Digital Circus, Inc. HASEGAWA Tomki

2. HASEGAWA Tomoki @tomzoh Web / iOS App Development, Rental Kart Race, Beer, IoT crafting, … hasegawa  tomoki Digital Circus, Inc. Vice-master CTO Tokyo, Japan Interests

3. ・ Web Development ・ Mobile Apps Development ・ Service （）（iOS, Android) （http://appbuilder.jp） Twitter: @tomzoh

4. Twitter: @tomzoh

5. Today’s theme Reading php-terminal-gameboy-emulator

7. By Transfrom JPEG version and remove white background. Original by Evan-Amos. - Media:Game-Boy-FL.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=37808150

8. 23, February

9. 😮

10. 😮

11. 😮 Awesome!!

12. 😮 Awesome!! Waste of talent!!

13. 😮 Awesome!! Waste of talent!! Cool!!

14. Source Files

15. Source Files It’s PHP !

16. Source Files It’s PHP ! We can read it.

17. Source Files It’s PHP ! Yes, We can! We can read it.

18. Source Files It’s PHP ! Yes, We can! Yes, We can! We can read it.

20. Components of GAMEBOY • CPU / Memory • Display • Sound • Buttons • Communication Port

21. Components of GAMEBOY • CPU / Memory • Display • Sound • Buttons • Communication Port

22. Buttons

23. Buttons - Keyboard.php <?php namespace GameBoy; class Keyboard { public $core; public $file; public $keyPressing = null; public $started = false; public function __construct(Core $core) { $this->core = $core; exec('stty -icanon'); $this->file = fopen('php://stdin', 'r'); stream_set_blocking($this->file, false); } public function check() {

24. Buttons - Keyboard.php <?php namespace GameBoy; class Keyboard { public $core; public $file; public $keyPressing = null; public $started = false; public function __construct(Core $core) { $this->core = $core; exec('stty -icanon'); $this->file = fopen('php://stdin', 'r'); stream_set_blocking($this->file, false); } public function check() {

25. How to sense buttons

26. How to sense buttons $this->file = fopen('php://stdin', 'r');

27. How to sense buttons $this->file = fopen('php://stdin', 'r'); $key = fread($this->file, 1);

28. Simple

29. CPU / Memory

30. CPU

31. SHARP LR35902 instruction set http://www.pastraiser.com/cpu/gameboy/gameboy_opcodes.html 1byte instructions Preﬁx CB instructions 144 instructions 256 instructions+ = 400 instructions

32. SHARP LR35902 resistors http://www.pastraiser.com/cpu/gameboy/gameboy_opcodes.html 15 … 8 7 … 0 A F B C H L 15 … 8 7 … 0 SP (Stack Pointer) PC (Program Counter) 8bit / 16bit resistors 16bit resistors Flag registor 7 6 5 4 3 2 1 0 Z N H C 0 0 0 0 •Z - Zero Flag •N - Subtract Flag •H - Half Carry Flag •C - Carry Flag •0 - Not uses, always zero

33. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - -

34. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Length in bytes Address LD A, d8 2 8 - - - -

35. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Duration in cyclesLength in bytes Address LD A, d8 2 8 - - - -

36. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Duration in cycles Flags aﬀected Length in bytes Address LD A, d8 2 8 - - - -

37. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - -

38. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - - PC (Program Counter)

39. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Load 0x0301 into BC resistor x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - - PC (Program Counter)

41. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - - Load 0x99 into A resistor PC (Program Counter)

43. Instruction in memory 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Load A resistor’s value into memory indicates with BC resistor x0 x1 x2 xE 0x 3x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Address LD A, d8 2 8 - - - - PC (Program Counter)

44. CPU - Opcode.php <?php namespace GameBoy; class Opcode { public $functionsArray = []; public function __construct() { //NOP //#0x00: $this->functionsArray[] = function ($parentObj) { //Do Nothing... }; //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) {

45. CPU - Opcode.php <?php namespace GameBoy; class Opcode { public $functionsArray = []; public function __construct() { //NOP //#0x00: $this->functionsArray[] = function ($parentObj) { //Do Nothing... }; //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { x0 x1 x2 0x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - -

46. CPU - Opcode.php <?php namespace GameBoy; class Opcode { public $functionsArray = []; public function __construct() { //NOP //#0x00: $this->functionsArray[] = function ($parentObj) { //Do Nothing... }; //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { Implementation of 0x00 NOP x0 x1 x2 0x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - -

47. CPU - Opcode.php <?php namespace GameBoy; class Opcode { public $functionsArray = []; public function __construct() { //NOP //#0x00: $this->functionsArray[] = function ($parentObj) { //Do Nothing... }; //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { x0 x1 x2 0x LD BC, d16 3 12 - - - - NOP 1 4 - - - - LD (BC), A 1 8 - - - - Implementation of 0x01 LD BC, d16

48. //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { $parentObj->registerC = $parentObj->memoryReader[$parentObj->programCounter]($parentObj, $parentObj->programCounter); $parentObj->registerB = $parentObj->memoryRead(($parentObj->programCounter + 1) & 0xFFFF); $parentObj->programCounter = ($parentObj->programCounter + 2) & 0xFFFF; }; Implementation of LD BC, d16 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Address PC (Program Counter)

49. //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { $parentObj->registerC = $parentObj->memoryReader[$parentObj->programCounter]($parentObj, $parentObj->programCounter); $parentObj->registerB = $parentObj->memoryRead(($parentObj->programCounter + 1) & 0xFFFF); $parentObj->programCounter = ($parentObj->programCounter + 2) & 0xFFFF; }; Implementation of LD BC, d16 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Address PC (Program Counter) C

50. //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { $parentObj->registerC = $parentObj->memoryReader[$parentObj->programCounter]($parentObj, $parentObj->programCounter); $parentObj->registerB = $parentObj->memoryRead(($parentObj->programCounter + 1) & 0xFFFF); $parentObj->programCounter = ($parentObj->programCounter + 2) & 0xFFFF; }; Implementation of LD BC, d16 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Address PC (Program Counter) B

51. //LD BC, nn //#0x01: $this->functionsArray[] = function ($parentObj) { $parentObj->registerC = $parentObj->memoryReader[$parentObj->programCounter]($parentObj, $parentObj->programCounter); $parentObj->registerB = $parentObj->memoryRead(($parentObj->programCounter + 1) & 0xFFFF); $parentObj->programCounter = ($parentObj->programCounter + 2) & 0xFFFF; }; Implementation of LD BC, d16 0x0000 0x0001 0x0002 0x003 0x004 0x005 0x0301 0x01 0x01 0x03 0x3e 0x99 0x02 0x99 LD BC, d16 0x0301 LD A, d8 0x99 LD (BC), A Data Instruction Address PC (Program Counter)

52. Implementation of JP a16 x3 cx JP a16 3 16 - - - -

53. Implementation of JP a16 x3 cx JP a16 3 16 - - - - Jump to address a16

54. Implementation of JP a16 x3 cx JP a16 3 16 - - - - Jump to address a16 0x0000 0x0001 0x0002 0xc3 0x29 0x03 JP a16 0x0329 Data Instruction Address

55. Implementation of JP a16 x3 cx JP a16 3 16 - - - - Jump to address a16 0x0000 0x0001 0x0002 0xc3 0x29 0x03 JP a16 0x0329 Data Instruction Address Jump to address 0x0329

56. Implementation of JP a16 x3 cx JP a16 3 16 - - - - Jump to address a16 //JP nn //#0xC3: $this->functionsArray[] = function ($parentObj) { $parentObj->programCounter = ($parentObj->memoryRead(($parentObj->programCounter + 1) & 0xFFFF) << 8) + $parentObj->memoryReader[$parentObj->programCounter]($parentObj, $parentObj->programCounter); }; 0x0000 0x0001 0x0002 0xc3 0x29 0x03 JP a16 0x0329 Data Instruction Address Jump to address 0x0329

57. Run loop public function executeIteration() { $op = 0; while ($this->stopEmulator == 0) { $op = $this->memoryRead($this->programCounter); $this->programCounter = ($this->programCounter + 1) & 0xFFFF; $this->CPUTicks = $this->TICKTable[$op]; $this->OPCODE[$op]($this); $this->updateCore(); } }

58. Not diﬃcult Simple, Easy

59. Let’s read php-terminal-gameboy-emulator

60. Thanks @tomzoh WE ARE HIRING Drupal / Mobile App Engineer  Digital Circus, Inc. Tokyo, Japan @tomzoh

61. Links • https://en.wikipedia.org/wiki/Game_Boy • http://www.pastraiser.com/cpu/gameboy/gameboy_opcodes.html • http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header • http://gameboy.mongenel.com/dmg/asmmemmap.html

62. More FPS? PHP5.5.30 OSX Native FPS: 4 PHP7.0.1 VirtualBox FPS: 14

63. Duration in cycles table <?php namespace GameBoy; class TickTables { public static $primary = [ //Number of machine cycles for each instruction: /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F*/ 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, //0 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, //1 2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, //2 2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, //3

64. Duration in cycles table <?php namespace GameBoy; class TickTables { public static $primary = [ //Number of machine cycles for each instruction: /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F*/ 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, //0 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, //1 2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, //2 2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, //3 1 machine cycle = 4 clocks

65. Duration in cycles table <?php namespace GameBoy; class TickTables { public static $primary = [ //Number of machine cycles for each instruction: /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F*/ 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, //0 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, //1 2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, //2 2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, //3 1 machine cycle = 4 clocks x4 cx CALL NZ,a16 3 24/12 - - - -

66. Duration in cycles table <?php namespace GameBoy; class TickTables { public static $primary = [ //Number of machine cycles for each instruction: /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F*/ 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, //0 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, //1 2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, //2 2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, //3 1 machine cycle = 4 clocks x4 cx CALL NZ,a16 3 24/12 - - - -Call address a16 if A resistor is zero. It takes 24 clocks.

67. 5月チケット販売開始 /トーク募集開始  6月上旬トーク募集〆切  6月下旬タイムテーブル決定 iOS Developers Conference Japan 2016 2016.08.20 https://iosdc.jp スポンサー企業さま、大絶賛募集中

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