<div class="blog">
<h1 id="NAME">
-New build system! Needs testing!
+SDL RC 2.5 decides to play with PDL
</h1>
<div class="CONTENT">
-<i></i><br />
-<i></i><br />
-<i></i><br />
-<i></i><br />
-<div style="text-align: right;"><i><span class="Apple-style-span" style="font-style: normal;"><i>Rome was not built,</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i>in one day,</i></span></i></div><div style="text-align: right;"><i><span class="Apple-style-span" style="font-style: normal;"><i> feature creep,</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i>existed back then too.</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i><br />
-</i></span></i><br />
-<div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;"><a href="http://github.com/kmx">kmx</a>++ recently worked on a brand new Build system for Alien::SDL and SDL_perl. We have managed to test it in Windows and Linux environments. We would still appreciate testing on all environments. However none of us have a shiny Mac to try this on. So if you have a Mac please consider testing the following:</span></i></div><div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i></div><div style="text-align: left;"></div><ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Download <a href="http://github.com/kthakore/Alien_SDL/tarball/master">Alien::SDL</a> </span></i></li>
-
-<ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">install it</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">select build by source</span></i></li>
-</ul>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Download <a href="http://github.com/kthakore/SDL_perl/tarball/redesign">SDL::perl</a></span></i></li>
-
-<ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Extract it</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">perl Build.PL</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">perl Build</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">See if Bundling works ( Maybe Brian's <a href="http://blogs.perl.org/users/brian_d_foy/2010/02/i-almost-have-sdl-perl-working-on-snow-leopard.html">article</a> may help )</span></i></li>
-</ul></ul><div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Thank you very much!</span></i><br />
-<br />
-<i><span class="Apple-style-span" style="font-style: normal;">EDIT: </span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"> After some reports back we have found out that SDL_gfx needs </span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;">http://cblfs.cross-lfs.org/index.php/SDL_gfx#64Bit</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;">We are working to get this done.</span></i></div></div><i></i><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-7073479532507652908?l=yapgh.blogspot.com' alt='' /></div>
-<p><a href="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/0/da"><img src="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/0/di" border="0" ismap="true"></img></a><br/>
-<a href="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/1/da"><img src="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/YetAnotherPerlGameHackeryapgh/~4/ORaGexsmrNo" height="1" width="1"/></div></div>
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+<i>PDL provides great number crunching capabilities to Perl and SDL provides game-developer quality real-time bitmapping and sound.<br />
+You can use PDL and SDL together to create real-time,<br />
+responsive animations and simulations.<br />
+In this section we will go through the pleasures and pitfalls of working with both powerhouse libraries.</i> <b>-- David Mertnes</b><br />
+<br />
+<br />
+<h1>Creating a SDL Surface piddle</h1><br />
+PDL's core type is a piddle.<br />
+Once a piddle is provided to PDL it can go do a numerous amounts of things.<br />
+Please see the example in '<a href="http://github.com/kthakore/SDL_perl/blob/master/examples/cookbook/pdl.pl">examples/cookbook/pdl.pl</a>' in github.<br />
+<br />
+<h3>Creating a simple piddle</h3><br />
+First lets get the right modules.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'> <span style='color:#e66170; font-weight:bold; '>use</span> <span style='color:#b060b0; '>PDL;</span>
+ <span style='color:#e66170; font-weight:bold; '>use</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Rect</span><span style='color:#b060b0; '>;</span>
+ <span style='color:#e66170; font-weight:bold; '>use</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Video</span><span style='color:#b060b0; '>;</span>
+ <span style='color:#e66170; font-weight:bold; '>use</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Surface</span><span style='color:#b060b0; '>;</span>
+ <span style='color:#e66170; font-weight:bold; '>use</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>PixelFormat</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Suppose you want a surface of size (200,400) and 32 bit (RGBA).<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>my</span> <span style='color:#d2cd86; '>(</span> $bytes_per_pixel<span style='color:#d2cd86; '>,</span> $width<span style='color:#d2cd86; '>,</span> $height <span style='color:#d2cd86; '>)</span> <span style='color:#d2cd86; '>=</span> <span style='color:#d2cd86; '>(</span> <span style='color:#00a800; '>4</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>200</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>400</span> <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Define the <b>$width</b>, <b>$height</b> and <b>$bytes_per_pixel</b>. Your <b>$bytes_per_pixel</b> is the number of bits (in this case 32) divided by 8 bits per byte. Therefore for our 32 bpp we have 4 Bpp;<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>my</span> $piddle <span style='color:#d2cd86; '>=</span> zeros<span style='color:#d2cd86; '>(</span> byte<span style='color:#d2cd86; '>,</span> $bytes_per_pixel<span style='color:#d2cd86; '>,</span> $width<span style='color:#d2cd86; '>,</span> $height <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Create a normal $piddle with zeros, byte format and the Bpp x width x height dimensions.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>my</span> $pointer <span style='color:#d2cd86; '>=</span> $piddle<span style='color:#d2cd86; '>-></span>get_dataref<span style='color:#d2cd86; '>(</span><span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Here is where we get the acutal data the piddle is pointing to. We will have SDL create a new surface from this function.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>my</span> $surface <span style='color:#d2cd86; '>=</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Surface</span><span style='color:#d2cd86; '>-></span>new_from<span style='color:#d2cd86; '>(</span> $pointer<span style='color:#d2cd86; '>,</span> $width<span style='color:#d2cd86; '>,</span> $height<span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>32</span><span style='color:#d2cd86; '>,</span>
+ $width <span style='color:#d2cd86; '>*</span> $bytes_per_pixel <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Using the same dimensions we create the surface using <b>SDL::Surface->new_form()</b>. The <b>$width * $Bpp</b> is the scanline (pitch) of the surface in bytes.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>warn</span> <span style='color:#00c4c4; '>"Made surface of </span><span style='color:#00c4c4; '>$width</span><span style='color:#00c4c4; '>, </span><span style='color:#00c4c4; '>$height</span><span style='color:#00c4c4; '> and "</span><span style='color:#d2cd86; '>.</span> $surface<span style='color:#d2cd86; '>-></span>format<span style='color:#d2cd86; '>-></span>BytesPerPixel<span style='color:#b060b0; '>;</span>
+ <span style='color:#e66170; font-weight:bold; '>return</span> <span style='color:#d2cd86; '>(</span> $piddle<span style='color:#d2cd86; '>,</span> $surface <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+Finally make sure that the surface acutally has the correct dimensions we gave.<br />
+<br />
+<b>NOTE:</b> <b>$surface->format->BytesPerPixel</b> must return 1,2,3,4. !!<br />
+<br />
+Now you can blit and use the surface as needed; and do PDL operations as required.<br />
+<br />
+<h3>Operating on the Surface safely</h3><br />
+To make sure SDL is in sync with the data. You must call SDL::Video::lock <b>before</b> doing PDL operations on the piddle.<br />
+<br />
+<pre><pre style='color:#d1d1d1;background:#000000;'><span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Video</span><span style='color:#d2cd86; '>:</span><span style='color:#d2cd86; '>:</span>lock_surface<span style='color:#d2cd86; '>(</span>$surface<span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+
+ $piddle <span style='color:#d2cd86; '>(</span> <span style='color:#d2cd86; '>:</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>0</span> <span style='color:#d2cd86; '>:</span> <span style='color:#e66170; font-weight:bold; '>rand</span><span style='color:#d2cd86; '>(</span><span style='color:#00a800; '>400</span><span style='color:#d2cd86; '>)</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>0</span> <span style='color:#d2cd86; '>:</span> <span style='color:#e66170; font-weight:bold; '>rand</span><span style='color:#d2cd86; '>(</span><span style='color:#00a800; '>200</span><span style='color:#d2cd86; '>)</span> <span style='color:#d2cd86; '>)</span> <span style='color:#d2cd86; '>.</span><span style='color:#d2cd86; '>=</span> pdl<span style='color:#d2cd86; '>(</span> <span style='color:#e66170; font-weight:bold; '>rand</span><span style='color:#d2cd86; '>(</span><span style='color:#00a800; '>225</span><span style='color:#d2cd86; '>)</span><span style='color:#d2cd86; '>,</span> <span style='color:#e66170; font-weight:bold; '>rand</span><span style='color:#d2cd86; '>(</span><span style='color:#00a800; '>225</span><span style='color:#d2cd86; '>)</span><span style='color:#d2cd86; '>,</span> <span style='color:#e66170; font-weight:bold; '>rand</span><span style='color:#d2cd86; '>(</span><span style='color:#00a800; '>255</span><span style='color:#d2cd86; '>)</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>255</span> <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre></pre><br />
+After that you can unlock the surface to blit.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Video</span><span style='color:#d2cd86; '>:</span><span style='color:#d2cd86; '>:</span>unlock_surface<span style='color:#d2cd86; '>(</span>$surface<span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+<h3>Errors due to BPP at blitting</h3><br />
+When blitting the new surface check for the return value to see if there has been a problem.<br />
+<br />
+<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>my</span> $b <span style='color:#d2cd86; '>=</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Video</span><span style='color:#d2cd86; '>:</span><span style='color:#d2cd86; '>:</span>blit_surface<span style='color:#d2cd86; '>(</span>
+ $surface<span style='color:#d2cd86; '>,</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Rect</span><span style='color:#d2cd86; '>-></span>new<span style='color:#d2cd86; '>(</span> <span style='color:#00a800; '>0</span><span style='color:#d2cd86; '>,</span> <span style='color:#00a800; '>0</span><span style='color:#d2cd86; '>,</span> $surface<span style='color:#d2cd86; '>-></span>w<span style='color:#d2cd86; '>,</span> $surface<span style='color:#d2cd86; '>-></span>h <span style='color:#d2cd86; '>)</span><span style='color:#d2cd86; '>,</span>
+ $app<span style='color:#d2cd86; '>,</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>Rect</span><span style='color:#d2cd86; '>-></span>new<span style='color:#d2cd86; '>(</span> <span style='color:#d2cd86; '>(</span> $app<span style='color:#d2cd86; '>-></span>w <span style='color:#d2cd86; '>-</span> $surface<span style='color:#d2cd86; '>-></span>w <span style='color:#d2cd86; '>)</span> <span style='color:#d2cd86; '>/</span> <span style='color:#00a800; '>2</span><span style='color:#d2cd86; '>,</span> <span style='color:#d2cd86; '>(</span> $app<span style='color:#d2cd86; '>-></span>h <span style='color:#d2cd86; '>-</span> $surface<span style='color:#d2cd86; '>-></span>h <span style='color:#d2cd86; '>)</span> <span style='color:#d2cd86; '>/</span> <span style='color:#00a800; '>2</span><span style='color:#d2cd86; '>,</span> $app<span style='color:#d2cd86; '>-></span>w<span style='color:#d2cd86; '>,</span> $app<span style='color:#d2cd86; '>-></span>h <span style='color:#d2cd86; '>)</span>
+ <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+
+ <span style='color:#e66170; font-weight:bold; '>die</span> <span style='color:#00c4c4; '>"Could not blit: "</span> <span style='color:#d2cd86; '>.</span> <span style='color:#904050; '>SDL</span><span style='color:#d2cd86; '>::</span><span style='color:#904050; '>get_error</span><span style='color:#d2cd86; '>(</span><span style='color:#d2cd86; '>)</span> <span style='color:#e66170; font-weight:bold; '>if</span> <span style='color:#d2cd86; '>(</span> $b <span style='color:#d2cd86; '>=</span><span style='color:#d2cd86; '>=</span> <span style='color:#d2cd86; '>-</span><span style='color:#00a800; '>1</span> <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
+</pre><br />
+If the error message is 'Blit combination not supported' that means that the BPP is incorrect or incosistent with the dimensions. After that a simple update_rect will so your new surface on the screen.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-3580429408870545769?l=yapgh.blogspot.com' alt='' /></div>
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projects / sdlgit/SDL-Site.git / blobdiff