opengl
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glBitmap


			
				
					
						
						
							
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<title>glBitmap: Class TglBitmap2D</title>
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<a name="TglBitmap2D"></a><h1 class="cio">Class TglBitmap2D</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td><a class="section" href="#PasDoc-Fields">Fields</a></td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a  href="glBitmap.html">glBitmap</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TglBitmap2D = class(<a class="normal" href="glBitmap.TglBitmap.html">TglBitmap</a>)</code></p>
<h2 class="description">Description</h2>
<p>
wrapper class for 2-dimensional textures (OpenGL target = GL_TEXTURE_2D)</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="ancestor"><a class="normal" href="glBitmap.TglBitmap.html">TglBitmap</a></li>
<li class="thisitem">TglBitmap2D</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Fields"></a><h3 class="summary">Fields</h3>
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<td class="itemcode"><code><b><a  href="glBitmap.TglBitmap2D.html#fLines">fLines</a></b>: array of PByte;</code></td>
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<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>function <b><a  href="glBitmap.TglBitmap2D.html#GetScanline">GetScanline</a></b>(const aIndex: Integer): Pointer;</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#SetDataPointer">SetDataPointer</a></b>(var aData: PByte; const aFormat: <a  href="glBitmap.html#TglBitmapFormat">TglBitmapFormat</a>; const aWidth: Integer = - 1; const aHeight: Integer = - 1); override;</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#UploadData">UploadData</a></b>(const aTarget: GLenum);</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#AfterConstruction">AfterConstruction</a></b>; override;</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#GrabScreen">GrabScreen</a></b>(const aTop, aLeft, aRight, aBottom: Integer; const aFormat: <a  href="glBitmap.html#TglBitmapFormat">TglBitmapFormat</a>);</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#GenTexture">GenTexture</a></b>(const aTestTextureSize: Boolean = true); override;</code></td>
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<td class="itemcode"><code>function <b><a  href="glBitmap.TglBitmap2D.html#FlipHorz">FlipHorz</a></b>: Boolean; override;</code></td>
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<td class="itemcode"><code>function <b><a  href="glBitmap.TglBitmap2D.html#FlipVert">FlipVert</a></b>: Boolean; override;</code></td>
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<td class="itemcode"><code>procedure <b><a  href="glBitmap.TglBitmap2D.html#GenerateNormalMap">GenerateNormalMap</a></b>(const aFunc: <a  href="glBitmap.html#TglBitmapNormalMapFunc">TglBitmapNormalMapFunc</a> = nm3x3; const aScale: Single = 2; const aUseAlpha: Boolean = false);</code></td>
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<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
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<td class="itemcode"><code>property <b><a  href="glBitmap.TglBitmap2D.html#Width">Width</a></b>;</code></td>
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<td class="itemcode"><code>property <b><a  href="glBitmap.TglBitmap2D.html#Height">Height</a></b>;</code></td>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a  href="glBitmap.TglBitmap2D.html#Scanline">Scanline</a></b>[constaIndex:Integer]: Pointer read <a  href="glBitmap.TglBitmap2D.html#GetScanline">GetScanline</a>;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Fields</h3>
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<td class="visibility"><a  href="legend.html"><img  src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><a name="fLines"></a><code><b>fLines</b>: array of PByte;</code></td>
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<p>
array to store scanline entry points in</p>
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<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="GetScanline"></a><code>function <b>GetScanline</b>(const aIndex: Integer): Pointer;</code></td>
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<p>
get a specific scanline  </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aIndex</dt>
<dd>index of the scanline to return</dd>
</dl>
<h6 class="description_section">Returns</h6>
<p class="return">scanline at position aIndex or <code>Nil</code></p></td></tr>
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<td class="visibility"><a  href="legend.html"><img  src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><a name="SetDataPointer"></a><code>procedure <b>SetDataPointer</b>(var aData: PByte; const aFormat: <a  href="glBitmap.html#TglBitmapFormat">TglBitmapFormat</a>; const aWidth: Integer = - 1; const aHeight: Integer = - 1); override;</code></td>
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<p>
set data pointer of texture data    </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aData</dt>
<dd>pointer to new texture data (be carefull, aData could be freed by this function)</dd>
<dt>aFormat</dt>
<dd>format of the data stored at aData</dd>
<dt>aWidth</dt>
<dd>width of the texture data</dd>
<dt>aHeight</dt>
<dd>height of the texture data</dd>
</dl>
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<td class="itemcode"><a name="UploadData"></a><code>procedure <b>UploadData</b>(const aTarget: GLenum);</code></td>
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<p>
upload the texture data to video card  </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aTarget</dt>
<dd>target o upload data to (e.g. GL_TEXTURE_2D)</dd>
<dt>aBuildWithGlu</dt>
<dd>use glu functions to build mipmaps</dd>
</dl>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="AfterConstruction"></a><code>procedure <b>AfterConstruction</b>; override;</code></td>
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<p>
this method is called after constructor and initializes the object</p>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GrabScreen"></a><code>procedure <b>GrabScreen</b>(const aTop, aLeft, aRight, aBottom: Integer; const aFormat: <a  href="glBitmap.html#TglBitmapFormat">TglBitmapFormat</a>);</code></td>
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<p>
copy a part of the frame buffer top the texture     </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aTop</dt>
<dd>topmost pixel to copy</dd>
<dt>aLeft</dt>
<dd>leftmost pixel to copy</dd>
<dt>aRight</dt>
<dd>rightmost pixel to copy</dd>
<dt>aBottom</dt>
<dd>bottommost pixel to copy</dd>
<dt>aFormat</dt>
<dd>format to store data in</dd>
</dl>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GenTexture"></a><code>procedure <b>GenTexture</b>(const aTestTextureSize: Boolean = true); override;</code></td>
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<p>
generate texture (create texture object if not exist, set texture parameters and upload data) </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aTestTextureSize</dt>
<dd>check the size of the texture and throw exception if something is wrong</dd>
</dl>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="FlipHorz"></a><code>function <b>FlipHorz</b>: Boolean; override;</code></td>
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<p>
flip texture horizontally </p>
<h6 class="description_section">Returns</h6>
<p class="return"><code>True</code> on success, <code>False</code> otherwise</p></td></tr>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="FlipVert"></a><code>function <b>FlipVert</b>: Boolean; override;</code></td>
</tr>
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<p>
flip texture vertically </p>
<h6 class="description_section">Returns</h6>
<p class="return"><code>True</code> on success, <code>False</code> otherwise</p></td></tr>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="GenerateNormalMap"></a><code>procedure <b>GenerateNormalMap</b>(const aFunc: <a  href="glBitmap.html#TglBitmapNormalMapFunc">TglBitmapNormalMapFunc</a> = nm3x3; const aScale: Single = 2; const aUseAlpha: Boolean = false);</code></td>
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<p>
create normal map from texture data   </p>
<h6 class="description_section">Parameters</h6>
<dl class="parameters">
<dt>aFunc</dt>
<dd>normal map function to generate normalmap with</dd>
<dt>aScale</dt>
<dd>scale of the normale stored in the normal map</dd>
<dt>aUseAlpha</dt>
<dd>generate normalmap from alpha channel data (if present)</dd>
</dl>
</td></tr>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="Width"></a><code>property <b>Width</b>;</code></td>
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<p>
actual width of the texture</p>
</td></tr>
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<td class="itemcode"><a name="Height"></a><code>property <b>Height</b>;</code></td>
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<p>
actual height of the texture</p>
</td></tr>
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<td class="visibility"><a  href="legend.html"><img  src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Scanline"></a><code>property <b>Scanline</b>[constaIndex:Integer]: Pointer read <a  href="glBitmap.TglBitmap2D.html#GetScanline">GetScanline</a>;</code></td>
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<p>
scanline to access texture data directly</p>
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