forked from KolibriOS/kolibrios
CHIP8: a little bit speed up graphics, update readme + small fixes
git-svn-id: svn://kolibrios.org@8734 a494cfbc-eb01-0410-851d-a64ba20cac60
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@ -18,6 +18,9 @@ include 'constants.inc'
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; application's entry point
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align 4
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start:
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mcall 68, 11
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mcall 68, 12, IMGBUF_SIZE
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mov dword [imgbuf_ptr], eax
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stdcall chip8_init ; initialize
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@ -16,7 +16,15 @@ KEY_SIZE = 16
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GFX_ROWS = 32
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GFX_COLS = 64
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GFX_SIZE = GFX_ROWS * GFX_COLS
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GFX_PIX_SIZE = 10
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GFX_PIX_SIZE = 10 ; gfx cell size in pixels
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COLOR_BACK = 0x000000
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COLOR_CELL = 0xade8f4 ;0xFFFFFF
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IMGBUF_WIDTH = GFX_COLS * GFX_PIX_SIZE ; width in pixels
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IMGBUF_HEIGHT = GFX_ROWS * GFX_PIX_SIZE ; height in pixels
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IMGBUF_SIZE = IMGBUF_WIDTH * IMGBUF_HEIGHT * 3 + 16 ; size in bytes for in-memory image buffer
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CLOCK_RATE = 1 ; in 10^-2 seconds
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@ -45,6 +45,8 @@
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sys_colors system_colors
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main_window_title db 'CHIP-8 Emulator',0
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imgbuf_ptr dd ? ; pointer to in-memory image buffer
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;=========================================
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align 16
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_i_end:
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@ -16,7 +16,7 @@ proc chip8_init stdcall
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stdcall _memset, key, 0, KEY_SIZE
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;DEBUGF DBG_INFO, "ESP = %x\n", esp
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mcall 66, 1 ; set scancode keyboard mode
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mcall 66, 1, 0 ; set ASCII keyboard mode
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xor ecx, ecx
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@@:
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@ -37,31 +37,88 @@ proc draw_screen stdcall
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div ecx ; eax = row index, edx = col index
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mov dword [row_ind], eax
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mov dword [col_ind], edx
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mov dword [color], 0x80FFFFFF ; white
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mov dword [color], COLOR_CELL ; white
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cmp byte [esi + gfx], 0 ; check if cell is 0 or not 0
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jne @f
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mov dword [color], 0x80000000 ; black
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mov dword [color], COLOR_BACK ; black
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@@:
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mov ebx, dword [col_ind]
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imul ebx, GFX_PIX_SIZE
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;add ebx, WINDOW_BORDER
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shl ebx, 16
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add ebx, GFX_PIX_SIZE
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imul ebx, GFX_PIX_SIZE ; now ebx - x coord of rect
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mov ecx, dword [row_ind]
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imul ecx, GFX_PIX_SIZE
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;add ecx, WINDOW_BORDER
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shl ecx, 16
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add ecx, GFX_PIX_SIZE
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mov eax, 13
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imul ecx, GFX_PIX_SIZE ; now ecx - y coord of rect
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mov edx, dword [color]
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int 0x40
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stdcall imgbuf_draw_rect, ebx, ecx, edx
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inc esi
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jmp .loop1
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.loop1_end:
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stdcall imgbuf_send_to_window
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popad
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ret
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endp
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; copy imgbuf contents to the emulator window
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align 4
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proc imgbuf_send_to_window stdcall
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DEBUGF DBG_INFO, "sending to window...\n"
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push eax ebx ecx edx
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mov eax, 7
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mov ebx, dword [imgbuf_ptr]
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mov ecx, IMGBUF_WIDTH
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shl ecx, 16
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add ecx, IMGBUF_HEIGHT
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xor edx, edx
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int 0x40
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pop edx ecx ebx eax
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ret
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endp
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; in internal buffer draw rect filled with given color at position (rect_x, rect_y) within window
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align 4
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proc imgbuf_draw_rect stdcall, rect_x: dword, rect_y: dword, rect_color: dword
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DEBUGF DBG_INFO, "imgbuf_draw_rect(%u, %u, %x)\n", [rect_x], [rect_y], [rect_color]
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push eax ebx ecx edx esi edi ebp
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mov ebx, dword [rect_y]
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imul ebx, IMGBUF_WIDTH
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add ebx, dword [rect_x] ; now ebx - index of first pixel of rect
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mov edi, dword [imgbuf_ptr]
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mov ebp, dword [rect_color]
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xor ecx, ecx
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.for_i:
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cmp ecx, GFX_PIX_SIZE
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jae .ret
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xor edx, edx
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.for_j:
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cmp edx, GFX_PIX_SIZE
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jae .for_j_end
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mov esi, edx
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add edx, ebx
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mov eax, ecx
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imul eax, IMGBUF_WIDTH
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add edx, eax ; now edx is index of edx'th pixel of ecx'th row of rect
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lea edx, [edx*3]
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add edx, edi
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mov dword [edx], ebp ; put color to pixel
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mov edx, esi
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inc edx
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jmp .for_j
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.for_j_end:
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inc ecx
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jmp .for_i
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.ret:
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pop ebp edi esi edx ecx ebx eax
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ret
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endp
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@ -1,12 +1,46 @@
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CHIP-8 Emulator for KolibriOS.
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Author: rgimad
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Year: 2021
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CHIP8 - Chip-8 systems emulator, written specially for KolibriOS in pure FASM from scratch.
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Author: rgimad (rustem.gimadutdinov@gmail.com)
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License: GNU GPL v2
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How to use:
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== Usage ==
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Open shell in emulator directory (in Eolite Ctrl+G opens shell).
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Open shell in current directory (in Eolite Ctrl+G).
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Type for example:
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chip8 roms/ibm.ch8
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chip8 roms/ibm.ch8
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P.S. ROMs from https://github.com/dmatlack/chip8/tree/master/roms
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== Keys ==
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CHIP8 emulator can process 16 keys, they are: 0-9, a, b, c, d, e, f
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== ROMs ==
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Emulator goes with some ROMs: games, demos, programs, etc.
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Some of them you can see below:
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=== TETRIS (roms/tetris1.ch8) ===
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How to play:
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4 key is left rotate
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5 - left move
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6 - right move
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After every 5 lines, the speed increases slightly and peaks at 45 lines.
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=== SPACE INVADERS (roms/invaders1.ch8) ===
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Very famous game
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=== MAZE (roms/maze_alt.ch8) ===
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A random maze generator
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=== RND (roms/rnd.ch8) ===
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Generates and prints out a random number. Press any key to generate one more.
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=== IBM (roms/ibm.ch8) ===
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Prints out the IBM logo
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=== CHIP8 (roms/chip8.ch8) ===
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Prints out the CHIP8 logo
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More ROMs you can find here: https://github.com/dmatlack/chip8/tree/master/roms
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