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tile.c
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tile.c
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////////////////////////////////////////////////////////////////////////////////
//
// Snake for ZX Spectrum 48K
//
// (C) 2019, 2020 David Crespo - https://github.com/dcrespo3d/zx-spectrum-snake
//
////////////////////////////////////////////////////////////////////////////////
#include "params0.h"
#include "tile.h"
// param0w: addr
// param0b: tile [0000BLRT]
void param_draw_tile()
{
__asm
PUSH BC
PUSH DE
PUSH HL
LD HL, (_param0w)
LD A, (_param0b)
AND A, %00000001
LD DE, BLRT_TILE_TB
ADD A, E
LD E, A
LD A, (DE)
LD (HL), A
INC H
LD A, (_param0b)
AND A, %00000110
RRCA
LD DE, BLRT_TILE_LR
ADD A, E
LD E, A
LD B, 6
PARAM_DRAW_TILE_LOOP:
LD A, (DE)
LD (HL), A
INC H
DJNZ PARAM_DRAW_TILE_LOOP
LD A, (_param0b)
AND A, %00001000
RRCA
RRCA
RRCA
LD DE, BLRT_TILE_TB
ADD A, E
LD E, A
LD A, (DE)
LD (HL), A
POP HL
POP DE
POP BC
__endasm
}
__asm
align 256
._fruit_glyph
DEFB 0, $3C, $6E, $5E, $7E, $7E, $3C, 0
BLRT_TILE_TB:
DEFB %00000000
BLRT_TILE_LR:
DEFB %01111110
DEFB %01111111
DEFB %11111110
DEFB %11111111
__endasm
// param0w: addr
void param_clear_tile()
{
__asm
PUSH BC
PUSH HL
LD HL, (_param0w)
LD B, 8
LD A, 0
PARAM_CLEAR_TILE_LOOP:
LD (HL), A
INC H
DJNZ PARAM_CLEAR_TILE_LOOP
POP HL
POP DE
__endasm
}