thepigeongenerator/tetris_clone
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add a tad more documentation about how we encode our data.

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Quinn
2025-09-09 23:06:56 +02:00
parent f8eb814a4a
commit a827c84223
2 changed files with 10 additions and 3 deletions
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2
src/tetris.c
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@@ -75,7 +75,7 @@ void tetris_place(u8 *restrict *restrict rows, u8 tetromino, uint x, uint y) {
uint *end = pos + 8; uint *end = pos + 8;
tetris_get_blocks(tetromino, pos); tetris_get_blocks(tetromino, pos);
tetromino &= 7; /* strip rotation data */ tetromino &= 7; /* strip rotation data */
tetromino |= 0x80; /* set an undefined bit, to signify there is data here. */ tetromino |= TET_NON_EMPTY;
for (; pos < end; pos += 2) for (; pos < end; pos += 2)
rows[*(pos + 1)][*pos] = tetromino; rows[*(pos + 1)][*pos] = tetromino;
} }

11
src/tetris.h
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@@ -6,9 +6,11 @@
#define TET_WIDTH 10 #define TET_WIDTH 10
#define TET_HEIGHT 24 /* height may be 16—24 */ #define TET_HEIGHT 24 /* height may be 16—24 */
/* Defines tetromino id. /* Defines tetromino indices.
* The `TET_R*` definitions specify various rotations. * The `TET_R*` definitions specify various rotations.
* This is designed to be OR'd with the tetromino shape index. */ * This is designed to be OR'd with the tetromino shape index.
* Shape index can be obtained via `val & 7`, and rotation index is
* obtained via `val >> 3`. */
enum tetromino { enum tetromino {
TET_I = 0x00, TET_I = 0x00,
TET_O = 0x01, TET_O = 0x01,
@@ -21,6 +23,11 @@ enum tetromino {
TET_R90 = 0x08, TET_R90 = 0x08,
TET_R180 = 0x10, TET_R180 = 0x10,
TET_R270 = 0x18, TET_R270 = 0x18,
/* Used when storing blocks to the board;
* allows to identify non-empty indices from empty ones.
* This value should not be used during general computation. */
TET_NON_EMPTY = 0x80,
}; };
/* Stores the co-ordinates of the four blocks in a 4x4 plane. /* Stores the co-ordinates of the four blocks in a 4x4 plane.