Trying Steven McDonald zx81 Pseudo Hires routines

[stefano]

I think I'll try to keep it dynamic, then build a graphics library with a default value (96), adjustable in custom builds.
Quite a bit of work remaining!

Obviously a game can already work with fixed patterns or whatever trick bashing on the existing concept, I think the core won't be affected by my future changes

[zx81ultra]

How would work a mixed hires/lores screen ? I found a site with a game where I think the developer work a pseudo hires screen except for the bottom 2 lines, that are kept in normal resolution:

http://perfectlynormalsite.com/hiresinvaders.html

[stefano]

a specific driver should be built, but don't ask me it

[stefano]

This will be my first attempt to remap every byte to 4 bit pseudo GFX, with I=12

unsigned char pixtab[]={ 11, 36, 162, 150, 55, 8, 143, 18, 12, 15, 40, 183, 22, 41, 164, 25};

[zx81ultra]

Well, first results trying to port a 32x24 text screen to 32x192 with I=14:

https://drive.google.com/open?id=1hW6NW ... 50IPvBb4L_

It's going to be a nice coding weekend...

I don't understand very well what you are meaning with:

Code: Select all

This will be my first attempt to remap every byte to 4 bit pseudo GFX, with I=12

unsigned char pixtab[]={ 11, 36, 162, 150, 55, 8, 143, 18, 12, 15, 40, 183, 22, 41, 164, 25};

[stefano]

>I don't understand very well what you are meaning with..

I'm trying to remap to a mid rez. map, 16 bytes are for a nibble (4 bits) to reach a 128 pixel rez.

[zx81ultra]

I found it?s very hard to find a suitable pattern set by hand for a practical use like a game so I developed a tool based on Google Sheets and some scripting.

It allows to visually compare (and edit) how a 256x192 graphic display translates to 11 different sets of ROM font patterns of 32x192 pseudo hires and then generates the C char array declaration.

https://docs.google.com/spreadsheets/d/ ... czmML_I_NQ

I hope this will make easier to develop games with pseudo hires.

[stefano]

you nailed those small numbers, very nice!

[stefano]

The driver variant I'm working on for z88dk will have a dynamic allocation of the display memory.
Due to the different way to set up the display pointer the frame sync will differ by 1 T-state.
I had to manually tune this prototype, so we can't say this is better or worse until we try on real machines.
Debugging is in progress. . damn it is a very delicate piece of code!

[zx81ultra]

Please let me know when the new version is available for testing ! meanwhile I'm trying to get my hands on real hardware, not an easy task on these turbulent times and on this side of the world.

Good luck !

[stefano]

Sadly also my rampack needs a fix, after I tried the WRX mod
A reasonable number of TV sets should be checked, I'll probably post something on zx81.de as soon as I get a resonably clean test program. ..This means I first need to complete a minimal implementation, first.

[stefano]

https://www.sinclairzxworld.com/viewtop ... 308#p37295

[zx81ultra]

That's great news Stefano ! extensive testing on the real stuff, very cool.

In the meanwhile I've been balancing quarantine life with coding, lot of progress here in what I think could be one of the first zx81 games written for pseudo hires with z88dk, you can take a sneak peek here:

https://youtu.be/AvLeLrEudGo

[stefano]

Very nice and fast! I have a half working putsprite() function, with still a couple of nasty bugs I still couldn't fix.
Also the plotting functions are unstable, but as you surely discovered, the pseudo-hrg is a delicate and complex environment

After having avoided all the traps z88dk will make it accessible to everybody

[zx81ultra]

as you surely discovered, the pseudo-hrg is a delicate and complex environment

oh yes, that's a very elegant way of describing the pseudo hires underworld...

[zx81ultra]

Hello,

My game using pseudo high res is almost ready to be released, everything works great on the EightyOne emulator but ZesarUX 8.1 is having problems rendering the hires display.

EightyOne:https://drive.google.com/file/d/1F5xoUv ... sp=sharing
ZesarUX: https://drive.google.com/file/d/1yEG1wW ... sp=sharing

Code: Select all

/**********************************************************************************************

RetroSnake (c) Camilo Eid (zx81ultra) 2020

Developed with z88dk for the Sinclair zx81 16k featuring pseudo high resolution on unmodified hardware

Pseudo high res asm routines by Stefano https://www.z88dk.org/forum/viewtopic.php?id=11219

zcc +zx81  -create-app pseudoHRtest.c

**********************************************************************************************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <input.h>
#include <zx81.h>

const unsigned char PseudoHiresDFile[]= { // rom idx 26 pseudo hires 32*192 display file (201 EOL)
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
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188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201,
188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,188,201
};

const unsigned char HighResPatterns[][]= {         // rom idx 26        pseudo hires udg characters                                                                                                          
{ 39,187,128,137,137,179, 20, 55} // APPLE
};

unsigned char *HRDisplay;

void SetPseudoHiRes(void) 
{
#asm

        EXTERN        L0229
        EXTERN        L0292

hires:      halt
            ld a,(04034h)
            ld c,a
sync1:      ld a,(04034h)
            cp c
            jr z, sync1
            
            ld    a,26        ; FONT ptr in ROM at address
            ld i,a
            ld iy,hresgen
            ret

hresgen:
            ld hl,_PseudoHiresDFile+$8000-33
            ld de,33
            di
            ld c,0feh
           
            nop            ;  z88dk ADJUSTED timing
            nop
            nop
            ld b,$15
            
sync3:      djnz sync3

            ld b,192
genline:    in a,(c)        ; trick the ULA and reset the..
            out (0ffh),a    ; ..character ROW counter
            add hl,de
            call ulaout
            dec b
            jp nz, genline    ; display 192 rows
            call L0292
            call L0220
            ld iy,hresgen    ; re-set IX to point to hresgen
            jp 02a4h

ulaout:     jp (hl)        ; 'execute' the display file at its shadowed position (the given row + $8000)

L0220:        
        PUSH    AF              ;
        PUSH    BC              ;
        PUSH    DE              ;
        PUSH    HL              ;
        JP      L0229           ; to DISPLAY-1   (was JR, equivalent T states, I think)

#endasm
} /*** SetPseudoHiRes ***/


void SetLoRes(void) 
{
zx_slow();        // Restore text mode subroutine

#asm
  ld a,$1e            ; Standard ROM font
  ld i,a
#endasm
} /*** SetLoRes ***/


void HighResWriteXY(unsigned char x, unsigned char y, unsigned char Code)
{
unsigned char PatternIdx, *HRPtr = HighResPatterns[code]; // udg pseudo high res character
int Offset;

Offset = x+264*y;
PatternIdx = 0;

Loop:
*(HRDisplay + Offset) = *HRPtr++;
Offset += 33;

if(++PatternIdx < 8)
        goto Loop;
} /*** HighResWriteXY ***/


void main(void)
{
int x,y;

HRDisplay = PseudoHiresDFile;

SetPseudoHiRes();
for(x=0; x <= 31; x+= 2)
        for(y=0; y <= 23; y += 2)
                HighResWriteXY(x,y,0);

in_WaitForKey();

SetLoRes();
} /*** main ***/

Any ideas ?

Thank you !

[zx81ultra]

Solved ! the LNCTR video adjust setting on the Display section has to be checked.

[stefano]

I just committed an update permitting to allocate automatically the d-file.
In case you wish to use it you should first change a constant in gfx/graphics.inc (192 rows to be set), clean , and rebuild gfx81.lib.
the created gfx81phrg.lib can be renamed and kept in /z88dk/lib/clibs.
Issuing a clg() will enter in pseudo hrg mode, allocate and initialize the display.
You may then add a reference to the base_graphics object and bind it to a char* variable.

[zx81ultra]

Thank you Stefano !

I was busy with the last touches to my game, RetroSnake has been finally released, including the source code: https://www.sinclairzxworld.com/viewtop ... f=4&t=3653

Good news is it has already been played OK on the real ZX81 ! the executable is at 16.190 bytes, I had to squeeze every possible byte.

I'll download the latest build and recompile my code to check if everything is fine, I remember I had to manually update PUBLIC L0229 in zx81_altint_core.asm

The other thing that I want to experiment with are the other resolutions you wrote about on the thread, I don't know if you have some example code to get me started ?

Really thankful for all your help with this project, I'm already thinking on the next one with z88dk...

[stefano]

Thanks to you for support and for your initial code sorting, it was very useful. I'm now stuck with odd bugs in the standard library, but it was sort of expected