RULEZ!
We continue to print ultra faaaaast algorithms 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-1997 - |
+------------------------------------------------- -----------+
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-1997 - |
+------------------------------------------------- -----------+
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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