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Good tips n tricks to learn coding ? |
| category: code |
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rudi: whether it's useful or not depends mostly on what you do with the image after converting - YUV isn't as easy to deal with as HSL. E.g. hue rotation involves vector rotation of UV with a couple of sins, instead of just an addition. More complex stuff is worse. But still, given how fast the rgb->YUV and back is, it's worth a look.
(And pure glsl here, targeting 720p at 30fps on a mobile GPU for extra challenge :D) |
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i do it on a per pixel basis. never coded any shader stuff before, but you probably could do that there as well (i dont know). anyway. i have so many projects lying around.. and i code something one day and something else another day. it sucks. |
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if only C could be as simple as PHP :p
no typed vars, tables, structs n all .. ahh..
well, i realize now that llearning PHP helps me a lot with the understanding of C, it's the same langage, more complicated to write lol |
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i suppose that, to write my php "beginner-code" in C, it will be much harder, with pointers, types and all
Code:
function VerifyBaieloc($champ) {
if(!preg_match_all('/^[U-Uu-u][0-9][0-9][U-Uu-u][0-9][0-9]$/', $champ, $out)){
echo '<br><br><font face="verdana">Erreur: la valeur "Emplacement dans la baie" doit etre au format UXXUXX</font><br><br>';
echo '<a href="javascript:history.back()"><font face="verdana" color="#91aa37">Retourner en arriere<br></a>';
exit;
}
}
function VerifyBaielocExist($champ, $table, $baieid) {
$tableu = array();
for($i=0; $i<=42; $i++){
$tableu[] = $i;
}
$newtableu = array();
$get_fields = 'SELECT baie_loc FROM '.$table.' WHERE baie_id = "'.$baieid.'" ORDER BY baie_loc';
$exec_get = mysql_query($get_fields);
while ($data = mysql_fetch_assoc($exec_get)) {
$unumb = $data['baie_loc'];
$Ustart = substr($unumb, 1, 2);
$Uend = substr($unumb, 4, 5);
if (preg_match('/^0/', $Ustart)) {
$Ustart = str_replace("0","",$Ustart);
}
for ($u=$Ustart; $u<=$Uend; $u++) {
$tableu[$u] = "filled";
}
}
$newnumb = $champ;
$newUstart = substr($newnumb, 1, 2);
$newUend = substr($newnumb, 4, 5);
for ($i=$newUstart; $i<=$newUend; $i++) {
$newtableu[$i] = "filled";
if ($tableu[$i] == "filled") {
echo '<br><font face="verdana">le U '.$i.' est deja utilise, merci de choisir un autre emplacement dans le rack</font><br><br>';
echo '<a href="javascript:history.back()"><font face="verdana" color="#91aa37">Retourner en arriere<br></a>';
exit;
}
}
}
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rudi: my shader version is all per-pixel too. The GPU can be much faster, but it doesn't like branching code so lots of if/else statements aren't good. And rgb->hsl and back is normally full of if/else statements :/
Speed: maybe avoid mysql in your first C experiments though ;) |
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Avoid multiplying by zero. It will save you hours of debug work. |
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sell your PC, buy an amiga, change its caps, and then only you will be certain to learn to code on a machine that will always be there in 20 years, thus your knowledge will be less obsolete.
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Quote:Avoid multiplying by zero. It will save you hours of debug work.
Real coders patch the "Divison by Zero" exception vector and happily divide by zero. \o/
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Just don't cross the streams.. |
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BALLS TOUCHING |
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