[SDL] Better performance needed - am I doing this right?

[Colin Tuckley]

Rúben Lício wrote:

> Dont update all screen every time, update only what you change, that is
> the way I'm doing in my current game, it do video speed up as well. 

I've tried that too, I've replaced:

if (echo) SDL_Flip(screen0);

with

if (echo) SDL_UpdateRect(screen0, xtext * 8, ytext * 8, 8, 8);

so that only the 8x8 cell I've changed is updated. It doesn't make any
difference.

My test program is a small BASIC program that counts to 100 printing each
number in the same place on the screen while keeping track of clock ticks.
So with cursor movement and drawing I'm drawing about 10 chars worth of
pixels for each count. The results are pretty consistent.

Colin

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