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73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
// Tetris Game for the Commodore 64
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// Memory Layout and Shared Data
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// Address of the first screen
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char* const PLAYFIELD_SCREEN_1 = 0x0400;
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// Address of the second screen
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char* const PLAYFIELD_SCREEN_2 = 0x2c00;
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// Screen Sprite pointers on screen 1
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char* const PLAYFIELD_SPRITE_PTRS_1 = (PLAYFIELD_SCREEN_1+OFFSET_SPRITE_PTRS);
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// Screen Sprite pointers on screen 2
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char* const PLAYFIELD_SPRITE_PTRS_2 = (PLAYFIELD_SCREEN_2+OFFSET_SPRITE_PTRS);
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// Sprites covering the playfield
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__address(0x3000) char PLAYFIELD_SPRITES[30*64] = kickasm(resource "playfield-sprites.png") {{
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.var sprites = LoadPicture("playfield-sprites.png", List().add($010101, $000000))
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// Put the sprites into memory
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.for(var sy=0;sy<10;sy++) {
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.var sprite_gfx_y = sy*20
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.for(var sx=0;sx<3;sx++) {
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.for (var y=0;y<21; y++) {
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.var gfx_y = sprite_gfx_y + mod(2100+y-sprite_gfx_y,21)
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.for (var c=0; c<3; c++) {
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.byte sprites.getSinglecolorByte(sx*3+c,gfx_y)
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}
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}
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.byte 0
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}
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}
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}};
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// Address of the charset
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__address(0x2800) char PLAYFIELD_CHARSET[] = kickasm(resource "playfield-screen.imap") {{
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.fill 8,$00 // Place a filled char at the start of the charset
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.import binary "playfield-screen.imap"
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}};
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// The size of the playfield
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const char PLAYFIELD_LINES = 22;
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const char PLAYFIELD_COLS = 10;
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// The playfield. 0 is empty non-zero is color.
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// The playfield is layed out line by line, meaning the first 10 bytes are line 1, the next 10 line 2 and so forth,
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char playfield[PLAYFIELD_LINES*PLAYFIELD_COLS];
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// Pointer to the current piece in the current orientation. Updated each time current_orientation is updated.
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char* current_piece_gfx;
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// The char of the current piece
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char current_piece_char;
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// Position of top left corner of current moving piece on the playfield
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char current_xpos;
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char current_ypos;
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// The screen currently being rendered to. 0x00 for screen 1 / 0x20 for screen 2.
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char render_screen_render = 0x20;
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// The screen currently to show next to the user. 0x00 for screen 1 / 0x20 for screen 2.
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char render_screen_show = 0;
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// The screen currently being showed to the user. 0x00 for screen 1 / 0x20 for screen 2.
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volatile char render_screen_showing = 0;
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// Current score in BCD-format
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unsigned long score_bcd = 0;
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// Current number of cleared lines in BCD-format
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unsigned int lines_bcd = 0;
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// Current level BCD-format
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char level_bcd = 0;
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// Current level in normal (non-BCD) format
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char level = 0;
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// Is the game over?
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char game_over = 0;
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