[twobob]

EDIT: Err no. my bad.

Spoiler:

see GM Video driver. add ordered dither and you're there

EDIT: Okay I had a quick look again, in essence pure black draws much quicker as you have identified, so here we avoid grays.


I just ripped out the relevant method: (this is 8bit K5 one, but w/e)

I have mercilessly ripped out bits to demo what you are talking about

PHP Code:

void gmplay8() {

//check out the original code but...
in essence we are defining what we are to draw inside, 
to what depth etc... (FBSIZE IS #define FBSIZE (600/8*800))
Also we have to tell it the exact types etc..
u32 __invalid_size_argument_for_IOC; // ioctl.h bug fix for tcc

    u32 i,x,y,b,fbsize=FBSIZE; u8 fbt[FBSIZE];

// Read it in...

    while (fread(fbt,fbsize,1,stdin)) { 

// Sync code elided.... sufficed to say it can drop frames...
 

//So jump every 8 lines...
        for (y=0;y<800;y++) for (x=0;x<600;x+=8) {

do order bit dither over 100 passes 8 pixels apart

            b=fbt[600/8*y+x/8]; i=y*fs+x;
            fb0[i]=(b&1)*255; b>>=1; fb0[i+1]=(b&1)*255; b>>=1;
            fb0[i+2]=(b&1)*255; b>>=1; fb0[i+3]=(b&1)*255; b>>=1;
            fb0[i+4]=(b&1)*255; b>>=1; fb0[i+5]=(b&1)*255; b>>=1;
            fb0[i+6]=(b&1)*255; b>>=1; fb0[i+7]=(b&1)*255;

// Update the frame count and pass an update enum to the lib...

        } fc++; gmlib(GMLIB_UPDATE);
    }
} 


// Etc..

More full details and someone who knows what they are talking about on this thread:
HTH

https://www.mobileread.com/forums/sho...d.php?t=177455