Re: [cc65] TGI palettes (was: TGI colors revisited)

Hi,

On Wed, May 11, 2011 at 10:29 AM, Karri Kaksonen <karri@sipo.fi> wrote:
> On 05/11/2011 02:33 PM, Oliver Schmidt wrote:
>>
>> Ideas, comments, opinions, objections?
>>
>
> From the programmers point of view I would scrap the concept of
> TGI_COLOR_RED completely.
>
> Instead I would have pens.
>
> tgi_setpen(index, R, G, B);
> tgi_setpen(index, intensity); // For bw display
>
> To draw in black I could write:
>
> tgi_setpen(0, 0);
>
> White would be
>
> tgi_setpen(1, 255);
>
> Red could be
>
> tgi_setpen(2, 255, 0, 0);

Problem is that there is no simple way to go from R,G,B to
a palette color in many drivers (ie, c64 and atari), so you
put a lot of code in the driver and slow down the application.

Using the TGI_COLOR_* macros you can map the value
of the macro directly to the palette color, using char, int or
long depending on the platform.

In Atari, you could define TGI_COLOR_BLUE to 148,
TGI_COLOR to 34, etc.

    Daniel.
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