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Deja Vu #09
13 ноября 1999 |
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Coding - how to print 42 characters per line (with trabutami), the procedure is quick print sprites with pixel precision.
(C) D.M0r0Zz
__________________________________________
Hello! Theme of today's program: fast printing 42 characters
per line, the attributes in this mode, the old songs about
scroll'e and rapid withdrawal of sprites with pixel precision
(stack free). Let's go!
1. Quick Print 42 characters per line.
So, to begin to create three
additional font, and each of them
will be 2 times larger than the original (4096 bytes
each), plus everything else, every
of the fonts will follow the sign for the addresses of his
characters (512 bytes). This fakingom engaged podproga called
CREAT. Call'nut it should at the very beginning, and then may
be safely used PRINT, more about which below.
Warning: none of the labels can not be held absolutely no
semantic load;)
FONT EQU BASE ADDRESS FONT
FONT2 EQU 49152
FONT3 EQU FONT2 +4096 +512
FONT4 EQU FONT3 +4096 +512
CREAT
LD DE, FONT2
LD HL, FONT
LD BC, 2048
F_CR1 LD A, (HL)
RLCA
RLCA
AND 3
LD (DE), A
INC DE
LD A, (HL)
RLCA
RLCA
AND 252
LD (DE), A
INC DE
INC HL
DEC BC
LD A, B
OR C
JR NZ, F_CR1
LD B, 0
LD IX, FONT2 +4096
LD HL, FONT2
LD DE, 16
F_CR11 LD (IX), L
INC IX
LD (IX), H
INC IX
ADD HL, DE
DJNZ F_CR11
LD HL, FONT
LD DE, FONT3
LD BC, 2048
F_CR2 LD A, (HL)
RRCA
RRCA
RRCA
RRCA
AND 15
LD (DE), A
INC DE
LD A, (HL)
RRCA
RRCA
RRCA
RRCA
AND 240
LD (DE), A
INC DE
INC HL
DEC BC
LD A, B
OR C
JR NZ, F_CR2
LD B, 0
LD IX, FONT3 +4096
LD HL, FONT3
LD DE, 16
F_CR21 LD (IX), L
INC IX
LD (IX), H
INC IX
ADD HL, DE
DJNZ F_CR21
LD BC, 2048
LD HL, FONT
LD DE, FONT4
F_CR3 LD A, (HL)
RRCA
RRCA
AND 63
LD (DE), A
INC DE
LD A, (HL)
RRCA
RRCA
AND 128 64
LD (DE), A
INC DE
INC HL
DEC BC
LD A, B
OR C
JR NZ, F_CR3
LD B, 0
LD IX, FONT4 +4096
LD HL, FONT4
LD DE, 16
F_CR31 LD (IX), L
INC IX
LD (IX), H
INC IX
ADD HL, DE
DJNZ F_CR31
RET
Well, now you can and anything stamped: address text in the
HL and boldly call PRINT (screen should be ochishen), whose
meaning is that for each character in the shift of familiarity
has its own font, IY stores the address of the transition to a
conclusion with the necessary displacement. To save time,
address "Offset fonts" are taken from previously created tables
and sundry can make table and a standard font.
PRINT XOR A
LD (Y_POZ_ +1), A
LD DE, # 4000
LD (S_TBL_ +1), DE
LD (SP_I +1), SP
LD IX, O1_
LD IY, FUCK1_
;> Install launch configuration.
O1_ LD A, (HL)
CP 1933
JP NC, O4_
CP 1932
JP NZ, O9_
;
; If blank, then immediately go to the next; schemu symbol
;
INC HL
EX DE, HL
LD A, LY
CP FUCK1_ '& ampL
JP Z, O11_
LD HL, S_TBL_ +1
INC (HL)
O11_ LD A, LY
CP FUCK1_ '& ampL
LD IY, FUCK2_
JP Z, O111_
CP FUCK2_ '& ampL
LD IY, FUCK3_
JP Z, O111_
CP FUCK3_ '& ampL
LD IY, FUCK4_
JP Z, O111_
LD IY, FUCK1_
O111_ EX DE, HL
JP (IX)
;
; Style design METKA '& ampL means that
; Taken the low byte address METKA.
;
O9_ CP # 0D; transition to sled.stroku
JP Z, Y_POZ_
CP 3; end of the text
JP Z, SP_I
INC HL
CP # 10; feature attributes
JR NZ, O1_
INC HL
JP (IX)
O4_ INC HL
EXX
LD L, A
LD H, 0
S_TBL_ LD DE, 0
JP (IY)
;
; Shift 2 bits from the start of familiarity
;
FUCK4_ LD IY, FUCK1_
LD BC, FONT4 +4096
JP FUCK0_
;
; Shift 4 bits from the beginning znakometsa
;
FUCK3_ LD IY, FUCK4_
LD BC, FONT3 +4096
JP FUCK0_
;
; Shift of 6 bits from the start of familiarity
;
FUCK2_ LD IY, FUCK3_
LD BC, FONT2 +4096
FUCK0_ ADD HL, HL
ADD HL, BC
LD SP, HL
POP HL
LD SP, HL
EX DE, HL
POP DE
LD A, E
OR (HL)
LD (HL), A
INC L
LD (HL), D
INC H
POP DE
LD (HL), D
DEC L
LD A, E
OR (HL)
LD (HL), A
INC H
POP DE
LD A, E
OR (HL)
LD (HL), A
INC L
LD (HL), D
INC H
POP DE
LD (HL), D
DEC L
LD A, E
OR (HL)
LD (HL), A
INC H
POP DE
LD A, E
OR (HL)
LD (HL), A
INC L
LD (HL), D
INC H
POP DE
LD (HL), D
DEC L
LD A, E
OR (HL)
LD (HL), A
INC H
POP DE
LD A, E
OR (HL)
LD (HL), A
INC L
LD (HL), D
INC H
POP DE
LD (HL), D
DEC L
LD A, E
OR (HL)
LD (HL), A
LD HL, S_TBL_ +1
INC (HL)
EXX
JP (IX)
;
; Character output without bias
;
FUCK1_ ADD HL, HL
ADD HL, HL
ADD HL, HL
LD BC, FONT
ADD HL, BC
LD SP, HL
EX DE, HL
POP DE
LD (HL), E
INC H
LD (HL), D
INC H
POP DE
LD (HL), E
INC H
LD (HL), D
INC H
POP DE
LD (HL), E
INC H
LD (HL), D
INC H
POP DE
LD (HL), E
INC H
LD (HL), D
LD IY, FUCK2_
EXX
JP (IX)
;
; Address calculation sled.linii.Standartno.
;
Y_POZ_ LD A, 0
CP 1923
JP Z, SP_I
INC A
LD (Y_POZ_ +1), A
EX DE, HL
LD B, A
AND # 18
ADD A, # 40
LD H, A
LD A, B
AND 7
RRCA
RRCA
RRCA
LD L, A
LD (S_TBL_ +1), HL
EX DE, HL
INC HL
LD IY, FUCK1_
JP (IX)
SP_I LD SP, 0
RET
2. Set the attributes on the screen with fonts
that in 42 characters per line.
LD DE, # 5800
LD BC, TEXT_ADRES;
LD A, 68; default attribute
LD (A_CC +1), A
A_S0 LD HL, A_TABLE
A_S1 LD A, (BC)
INC BC
CP 1932
JR NC, A_K
CP 3; CODE END OF TEXT
RET Z
CP # 0D; CODE END OF LINE
JR Z, A_N
CP # 10; attribute code
JR Z, A_C
A_K LD A, E
EX AF, AF
LD A, E
ADD A, (HL)
LD E, A
A_CC LD A, 0
LD (DE), A
EX AF, AF
LD E, A
INC HL
JR A_S1
A_C LD A, (BC)
LD (A_CC +1), A
INC BC
JR A_S1
A_N LD A, E
EX AF, AF
LD A, E
ADD A, (HL)
LD E, A
LD A, (A_CC +1)
LD (DE), A
EX AF, AF
LD E, A
LD HL, # 20
ADD HL, DE
EX DE, HL
LD A, D
CP # 5B
JR C, A_S0
RET
A_TABLE DB 0,0,1,2,3,3,4,5,6,6,7
DB 8,9,9,10,11,12,12,13,14
DB 15,15,16,17,18,18,19,20
DB 21,21,22,23,24,24,25,26
DB 27,27,28,29,30,30,31,31
This procedure creates a similar
to shift the screen down on a familiarity.
ADRES EQU # 4000; address from which we
; Shifts
N EQU 24; NUMBER scrollable
; LINES
KUDA EQU # C000; where to put PROCEDURE
LD IX, KUDA
LD DE, ADRES +16
LD HL, ADRES + # 20
LD B, N * 8
LD (IX), # F3; DI
INC IX
LD (IX), # ED
INC IX
LD (IX), # 73
INC IX
INC IX
INC IX; LD (NNNN), SP
CKL1 PUSH HL, DE
CALL SETS
CALL SETS
POP DE, HL
CALL DN_DE; STANDARD Proc
CALL DN_HL; fools to find
DJNZ CKL1; SLED.POZITSII
; For quick Scroll ATTRIBUTES
And it should be changed address, Remove "* 8" FRONT
; N and replace "Kala" at finding a trace.
; POSITION Attributes
LD (IX), # 31
INC IX
LD (KUDA +3), IX
INC IX
INC IX
LD (IX +0), # FB; EI
LD (IX +1), # C9; RET
RET
SETS LD (IX +0), # 31
LD (IX +1), L
LD (IX +2), H
LD (IX +3), # F1
LD (IX +4), # C1
LD (IX +5), # D1
LD (IX +6), # E1
LD (IX +7), # D9
LD (IX +8), # C1
LD (IX +9), # D1
LD (IX +10), # E1
LD (IX +11), # DD
LD (IX +12), # E1
LD (IX +13), # 31
LD (IX +14), E
LD (IX +15), D
LD (IX +16), # DD
LD (IX +17), # E5
LD (IX +18), # E5
LD (IX +19), # D5
LD (IX +20), # C5
LD (IX +21), # D9
LD (IX +22), # E5
LD (IX +23), # D5
LD (IX +24), # C5
LD (IX +25), # F5
PUSH BC
LD BC, 16
ADD HL, BC
EX DE, HL
ADD HL, BC
EX DE, HL
LD BC, 26
ADD IX, BC
POP BC
RET
Similarly, we can get the scroll in the opposite direction.
3. Quick conclusion sprite up
pixel.
My proposed algorithm differs
from all previously published the fact that before
Begin the table is created (and where did
without them) with a length of 256 bytes (that is how much
different combinations of bits contained in 1
byte), the tables are stored halves shifted bytes.
Example of creating a pair of these tables for
Print sprite with a shift in the 2-bit bytes from the beginning
("ld" free;)).
SM2_1 EQU # C000
SM2_2 EQU # C100
; Tables should go with a flat addresses 1 per
And another for kazhdogosdviga need 2
; Table t.k.bayt divided into 2 pieces.
HL, SM2_1
DE, SM2_2
C, 0
CREAT A, C
SRL A; shift for the first half
SRL A; right by 2 bits
(HL), A
A, C
SLA A; second part will be shifted
SLA A; a 6-bit to the left.
SLA A
SLA A
SLA A
SLA A
(DE), A
INC HL
INC DE
INC C
JR NZ, CREAT
Similarly, you can get the other shifts. Generally, it is
not necessary print with pixel accuracy, in many
cases, excellent results are obtained
at step 2 pixels.
An example of "naked" horizontal printing
line sprite 2-byte offset
2 bits (bc-address in the screen, de-a sprite).
A, (DE); took byte sprite
L, A; in hl obtain location
H, SM2_1 '&H; shifted to the right bytes
A, (HL); took ...
(BC), A; put ...
INC L; sled.znakomesto ...
INC H; moved to table the "Left"
; Shifts.
A, (HL); took ...
(BC), A; put ...
INC DE; sled.bayt sprite
DEC H; again switched to the original
; Table.
A, (DE); took byte sprite
L, A; and were shifted version
A, (BC); the same ...
OR (HL)
(BC), A
INC H
INC C
A, (HL)
(BC), A
etc.
I hope you get the point;). As we see,
pretty decent speed, even without using the stack.
P.S. I have tried several times to go
after Xas'a in Alasm, but then LD forget to dial, then click on
EDIT at the disc draws me to sleep, and instead of "#"
persistently put the point ...
Help, good people;).
WARNING WARNING !!!!!
Anyone who wants to get me angry
hitting and what would his treacherous crime knew then all the
poor provincial Yousser, write!
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