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Buzz
#13
12 февраля 1998 |
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Ассемблер - Процедуры : Stretch texture engine, Texture mapping engine, Texture mapping + gourauds hading engine, Gouraudmapping engine for Z80.
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▓▓░ RULEZ! ▓▓▓ ░▓▓ ░▓▓ ░▓▓
Мы продолжаем печатать ultra faaaaast алгоритмы by Exploder/
MegaCode/Extreme.
+------------------------------------------------------------+
| - Stretch texture engine for Z80 CPU - |
| - last n'joyment date: 11-JUL-97 - |
+------------------------------------------------------------+
And now...
Ultra faaaaast stretch texture algorythm
ver_1:
POP HL ; Read XY shifts
ADD HL,BC ; Increase YX pos in texture
LD A,(HL) ; Read texel from texture
LD (DE),A ; Write texel to chunky buffer
INC E ;
About 39 takts of CPU power
Really needed:
SP = Pointer to shifts-tab
BC = YX-increase
DE = Pointer to destination chunky buffer
ver_2:
LD HL,#0000 ; XY shifts data
ADD HL,BC ; Increase YX pos in texture
LD D,(HL) ; Read texel from texture
LD HL,#0000 ; XY shifts data
ADD HL,BC ; Increase YX pos in texture
LD E,(HL) ; Read texel from texture
PUSH DE ; Write 2texels to chunky buffer
About 67 takts of CPU power
Really needed:
BC = YX-increase
SP = Pointer to destination chunky buffer
ver_3: with light map mix
POP HL ; Read XY shifts
ADD HL,BC ; Increase YX pos in texture
LD L,(HL) ; Read texel from texture
LD H,(IX+#00) ; Read light tab pointer
LD (DE),A ; Write texel to chunky buffer
INC E ;
About 58 takts of CPU power
Really needed:
SP = Pointer to shifts-tab
BC = YX-increase
DE = Pointer to destination chunky buffer
IX = Pointer to light tab
ver_4: with light map mix
LD HL,#0000 ; XY shifts data
ADD HL,BC ; Increase YX pos in texture
LD L,(HL) ; Read texel from texture
LD H,#00 ; Light pointer data
LD D,(HL) ; Read mixed texel
LD HL,#0000 ; XY shifts data
ADD HL,BC ; Increase YX pos in texture
LD L,(HL) ; Read texel from texture
LD H,#00 ; Light pointer data
LD E,(HL) ; Read mixed texel
PUSH DE ; Write 2texels to chunky buffer
About 93 takts of CPU power
Really needed:
BC = YX-increase
SP = Pointer to destination chunky buffer
Is the fastest stretch texture code for Z80. Nothing else.
+------------------------------------------------------------+
| - Texturemapping engine for Z80 CPU - |
| - last n'joyment date: 25-NOV-97 - |
+------------------------------------------------------------+
And now...
Ultra faaaaast texturemapped algorythm
LD A,H ;
ADD HL,BC ; Increase Y-pos in texture
EXX ;
LD D,A ; Set Y-pos
LD E,H ; Set X-pos
LD A,(DE) ; Get texel from texture
ADD HL,BC ; Increase X-pos in texture
EXX ;
LD (DE),A ; Write texel to chunky buffer
INC E ;
About 60 takts of CPU power
Really needed:
HL = Y-position on texture
BC = Y-increase
DE = Pointer to destination chunky buffer
HL'= X-position on texture
BC'= X-increase
Is the fastest texturemapping code for Z80. Nothing else.
+------------------------------------------------------------+
| - Texturemapping + gouraudshading engine for Z80 CPU - |
| - last n'joyment date: 06-DEC-97 - |
+------------------------------------------------------------+
And now...
Ultra faaaaast tmap+gouraudshading algorythm
LD A,H ;
ADD HL,BC ; Increase Y-pos in texture
EXX ;
LD D,A ; Set Y-pos
LD E,H ; Set X-pos
LD A,(DE) ; Get texel from texture
LD HL,BC ; Increase X-pos in texture
LD E,A ;
LD D,(IX+#00) ; Get shading pointer
LD A,(DE) ; Get shaded texel
EXX ;
ADD IX,DE ; Increase shading-table pointer
LD (IY+#00),A ; Write shaded texel to buffer
About 113 takts of CPU power
Really needed:
HL = Y-position on texture
BC = Y-increase
IX = Pointer to shading-table
DE = Shading-increase
HL'= X-position on texture
BC'= X-increase
IY = Pointer to destination chunky buffer
Is the fastest tmap+gouraudshading code for Z80. Nothing else.
+------------------------------------------------------------+
| - Gouraudmapping engine for Z80 CPU - |
| - last n'joyment date: 05-DEC-97 - |
+------------------------------------------------------------+
And now...
Ultra faaaaast gouraudmapping algorythm
ver_1: extra fast
LDI ; Write shaded pixel to buffer
ADD HL,BC ; Increase shading-table pointer
About 27 takts of CPU power
ver_2: full correctly
LD A,(HL) ; Read data from shading-table
LD (DE),A ; Write shaded pixel to buffer
INC E
ADD HL,BC ; Increase shading-table pointer
About 29 takts of CPU power
Really needed:
HL = Pointer to shading-table
BC = Shading-increase
DE = Pointer to destination chunky buffer
Is the fastest gouraudmapping code for Z80. Nothing else.
+----------------------------------------*Exploder/Extreme*--+
| - exploder_xtm@usa.net - - +7 (0922) 29-04-25 - |
+-------------------------------------------<ZX128,A1200>----+
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