58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#include <stdlib.h>
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#include <assert.h>
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#include <stdint.h>
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#include "../../compat/pgmspace.h"
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#include "piece.h"
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/*****************************
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* construction/destruction *
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*****************************/
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tetris_piece_t *tetris_piece_construct(tetris_piece_shape_t s,
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tetris_piece_angle_t a)
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{
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tetris_piece_t *p_piece = (tetris_piece_t*) malloc (sizeof(tetris_piece_t));
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assert(p_piece != NULL);
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p_piece->shape = s;
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p_piece->angle = a;
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return p_piece;
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}
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/****************************
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* piece related functions *
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****************************/
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uint16_t tetris_piece_getBitmap(tetris_piece_t *pPc)
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{
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assert(pPc != NULL);
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assert((pPc->angle < 4) && (pPc->shape < 7));
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// Lookup table:
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// A value in an array represents a piece in a specific angle (rotating
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// clockwise from index 0).
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static uint16_t const piece[][4] PROGMEM =
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{{0x0F00, 0x2222, 0x0F00, 0x2222}, // LINE
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{0x4E00, 0x4640, 0x0E40, 0x4C40}, // T
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{0x0660, 0x0660, 0x0660, 0x0660}, // SQUARE
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{0x2E00, 0x88C0, 0x0E80, 0xC440}, // L
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{0x8E00, 0x6440, 0x0E20, 0x44C0}, // LBACK
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{0x6C00, 0x4620, 0x6C00, 0x4620}, // S
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{0xC600, 0x4C80, 0xC600, 0x4C80}}; // Z
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return pgm_read_word(&piece[pPc->shape][pPc->angle]);
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}
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uint8_t tetris_piece_getAngleCount(tetris_piece_t *pPc)
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{
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assert(pPc != NULL);
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static int8_t const angleCounts[] PROGMEM = {2, 4, 1, 4, 4, 2, 2};
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return pgm_read_byte(&angleCounts[pPc->shape]);
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}
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