Needs 'elp with C TINT fn.

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1 total messages Started by Tom Kirby-Green Fri, 07 Aug 1992 17:23

#115

Author: Tom Kirby-Green
Date: Fri, 07 Aug 1992 17:23

42 lines
2236 bytes

Can any kindly C coder's out there 'elp with this! I need
to be able to select a colour in a 256 mode. I've tried 
to hack up the BASIC TINT command etc, but no joy so far.
The SWI I've been using along with GCOL is below.
Am I on the right track? OR am I barking up the wrong
SWI?
It'd be nice if Acorn would release the v3.1 PRMs so 
A5000 users could buy em, I refuse to buy the v2 ones until
I know I'll be able to upgrade.


        extern _kernel_swi_regs *inRegs;
        extern _kernel_swi_regs *outRegs;
        extern _kernel_oserror *kernelOSerr;

/* multipurpose VDU command */
        kernelOSerr = _kernel_swi ( VDU + 23, NULL, NULL );
/* select the TINT operation */
        inRegs->r [ 0 ] = 17;
/* action, range 0-3, sets text fore/background & graphics fore/background */
/* respectively */
        inRegs->r [ 0 ] = action;
        kernelOSerr = _kernel_swi ( OS_WriteC, inRegs, outRegs );
/* white, amount of white to add to base colour, values 0, 64, 128, 192. */
/* Only the top two bits of these values are significant                 */
        inRegs->r [ 0 ] = white;
        kernelOSerr = _kernel_swi ( OS_WriteC, inRegs, outRegs );


Thanks, as they say, in advance.

  /------------------| The Polytechnic Of Central London |-------------------\
  \     Name  : Tom Kirby-Green       /---\ / /    /--\ /\  \ /--\ /--\     /
   \    EMail : gpcec@sun.pcl.ac.uk   \---\ | |    \--  | \ | |    \--     /
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-- 
  /------------------| The Polytechnic Of Central London |-------------------\
  \     Name  : Tom Kirby-Green       /---\ / /    /--\ /\  \ /--\ /--\     /
   \    EMail : gpcec@sun.pcl.ac.uk   \---\ | |    \--  | \ | |    \--     /
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