<div class="blog">
<h1 id="NAME">
-SDL RC 2.5 decides to play with PDL
+Perl+SDL 3D Rendering
</h1>
<div class="CONTENT">
-<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 />
+<i>Recently we have done a lot of work on the next release of SDL Perl. But it all pays off when I see users do cool things as one of the users has done below. Talon^++! This project is a great example for people wanting to learn 3D from scratch. </i><br />
<br />
+<i>--yapgh</i><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 />
+<hr />This was a project to test how well Perl+SDL performs and does not use OpenGL at all. This is all perl and SDL, with the help of libsdl_gfx for SDL::GFX::Primitives. Texture mapping doesn't use SDL::GFX::Primitives because textured_polygon just takes a surface, tiles it, and clips out the polygon, which doesn't look 3D at all.<br />
<br />
-<h3>Creating a simple piddle</h3><br />
-First lets get the right modules.<br />
+Below are some screen shots of this little toy in action. If you'd like to try it yourself, you can download the entire project <a href="http://sdlperl.ath.cx/releases/texmap.tgz">here</a>. You can rotate the objects with the mouse, or keyboard arrows. Also press shift to toggle shading and space to switch objects.<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 />
+NOTE: the project is compressed in the .tgz format, if you are a windows user, you may need a tool like 7zip to extract the contents.<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 />
+<hr /><div>Standard Cube:<br />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSAt5QUmgI/AAAAAAAAALQ/Yf9XBOYhA7w/s1600/cube.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSAt5QUmgI/AAAAAAAAALQ/Yf9XBOYhA7w/s320/cube.png" /></a></div><br />
+</div><hr /><div>Standard Cube with Pseudo Shading:<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 />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSAxNHzBEI/AAAAAAAAALY/TMc-Dwzvz7k/s1600/cubeshade.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSAxNHzBEI/AAAAAAAAALY/TMc-Dwzvz7k/s320/cubeshade.png" /></a></div><br />
+</div><hr /><div>Standard Diamond:<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 />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://1.bp.blogspot.com/_NnqjAQEn1Xo/TFSA0YnNSYI/AAAAAAAAALg/Ym6OD5JVjrs/s1600/diamond.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/_NnqjAQEn1Xo/TFSA0YnNSYI/AAAAAAAAALg/Ym6OD5JVjrs/s320/diamond.png" /></a></div><br />
+</div><hr /><div>Standard Diamond with Pseudo Shading:<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 * $Bpp</b> is the scanline (pitch) of the surface in bytes.<br />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSA39MwDSI/AAAAAAAAALo/WV5wzDtCyo8/s1600/diamondshade.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/_NnqjAQEn1Xo/TFSA39MwDSI/AAAAAAAAALo/WV5wzDtCyo8/s320/diamondshade.png" /></a></div><br />
+</div><hr /><div>Textured Cube:<br />
<br />
-<pre style='color:#d1d1d1;background:#000000;'><span style='color:#e66170; font-weight:bold; '>warn</span> <span style='color:#00c4c4; '>"Made surface of </span><span style='color:#00c4c4; '>$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> $surface <span style='color:#d2cd86; '>)</span><span style='color:#b060b0; '>;</span>
-</pre><br />
-Finally make sure that the surface acutally has the correct dimensions we gave.<br />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://3.bp.blogspot.com/_NnqjAQEn1Xo/TFSA_RVjHtI/AAAAAAAAALw/nwEjFLv8XvE/s1600/texturedcube.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/_NnqjAQEn1Xo/TFSA_RVjHtI/AAAAAAAAALw/nwEjFLv8XvE/s320/texturedcube.png" /></a></div><br />
+</div><hr /><div>Perspectively Correct Textured Cube:<br />
<br />
-<b>NOTE:</b> <b>$surface->format->BytesPerPixel</b> must return 1,2,3,4. !!<br />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://1.bp.blogspot.com/_NnqjAQEn1Xo/TFSBCIUu4iI/AAAAAAAAAL4/_lgY1_mE4ow/s1600/texturedcorrectcube.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/_NnqjAQEn1Xo/TFSBCIUu4iI/AAAAAAAAAL4/_lgY1_mE4ow/s320/texturedcorrectcube.png" /></a></div><br />
+</div><hr /><div>Perspectively Correct Textured Cube with shading:<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>
-<p><a href="http://feedads.g.doubleclick.net/~a/HRpCokqdJ-wzrP1ZXUvgwcUNL_s/0/da"><img src="http://feedads.g.doubleclick.net/~a/HRpCokqdJ-wzrP1ZXUvgwcUNL_s/0/di" border="0" ismap="true"></img></a><br/>
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+<div class="separator" style="clear: both; text-align: center;"><a href="http://4.bp.blogspot.com/_NnqjAQEn1Xo/TFSBEFUB9HI/AAAAAAAAAMA/uLPUugpgspg/s1600/texturedcubeshade.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/_NnqjAQEn1Xo/TFSBEFUB9HI/AAAAAAAAAMA/uLPUugpgspg/s320/texturedcubeshade.png" /></a></div><br />
+</div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-6534662499260158364?l=yapgh.blogspot.com' alt='' /></div>
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