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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: CastleRenderer: Class TGLRendererContextCache</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TGLRendererContextCache"></a><h1 class="cio">Class TGLRendererContextCache</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>Fields</td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td>Properties</td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
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<a href="CastleRenderer.html">CastleRenderer</a></p>
<h2 class="declaration">Declaration</h2>
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<code>type TGLRendererContextCache = class(TObject)</code></p>
<h2 class="description">Description</h2>
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Cache used by <a class="normal" href="CastleRenderer.TGLRenderer.html">TGLRenderer</a> instances to share OpenGL resources, like textures. This may save a lot of OpenGL memory when you use multiple renderers (for example, multiple <a class="normal" href="CastleScene.TCastleScene.html">TCastleScene</a> instances).
<p>The cache can only be shared by renderers in the same OpenGL context, or in shared OpenGL contexts. It cannot be reused in totally alien OpenGL contexts, as the OpenGL identifiers will simply not exist there. In practice, this should not be a problem, as our OpenGL contexts always share resources, and you will almost always just use a single instance of this cache inside <a class="normal" href="CastleScene.html#GLContextCache">GLContextCache</a>.</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="thisitem">TGLRendererContextCache</li></ul><h2 class="overview">Overview</h2>
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<td class="itemcode"><code>constructor <b><a href="CastleRenderer.TGLRendererContextCache.html#Create">Create</a></b>;</code></td>
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<td class="itemcode"><code>destructor <b><a href="CastleRenderer.TGLRendererContextCache.html#Destroy">Destroy</a></b>; override;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRenderer.TGLRendererContextCache.html#Shape_IncReference">Shape_IncReference</a></b>(Shape: <a href="CastleRenderer.TX3DRendererShape.html">TX3DRendererShape</a>; Fog: <a href="X3DNodes.IAbstractFogObject.html">IAbstractFogObject</a>; ARenderer: <a href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>): <a href="CastleRenderer.TShapeCache.html">TShapeCache</a>;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleRenderer.TGLRendererContextCache.html#Shape_DecReference">Shape_DecReference</a></b>(var ShapeCache: <a href="CastleRenderer.TShapeCache.html">TShapeCache</a>);</code></td>
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<td class="itemcode"><code>function <b><a href="CastleRenderer.TGLRendererContextCache.html#Program_IncReference">Program_IncReference</a></b>(ARenderer: <a href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>; Shader: TShader; const ShapeNiceName: string): <a href="CastleRenderer.TShaderProgramCache.html">TShaderProgramCache</a>;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleRenderer.TGLRendererContextCache.html#Program_DecReference">Program_DecReference</a></b>(var ProgramCache: <a href="CastleRenderer.TShaderProgramCache.html">TShaderProgramCache</a>);</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>;</code></td>
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<td class="itemcode"><a name="Destroy"></a><code>destructor <b>Destroy</b>; override;</code></td>
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<td class="itemcode"><a name="Shape_IncReference"></a><code>function <b>Shape_IncReference</b>(Shape: <a href="CastleRenderer.TX3DRendererShape.html">TX3DRendererShape</a>; Fog: <a href="X3DNodes.IAbstractFogObject.html">IAbstractFogObject</a>; ARenderer: <a href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>): <a href="CastleRenderer.TShapeCache.html">TShapeCache</a>;</code></td>
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Shape cache. We return <a class="normal" href="CastleRenderer.TShapeCache.html">TShapeCache</a>, either taking an existing instance from cache or creating and adding a new one. Caller is responsible for checking are Arrays / Vbo zero and eventually initializing and setting.</p>
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<td class="itemcode"><a name="Shape_DecReference"></a><code>procedure <b>Shape_DecReference</b>(var ShapeCache: <a href="CastleRenderer.TShapeCache.html">TShapeCache</a>);</code></td>
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<td class="itemcode"><a name="Program_IncReference"></a><code>function <b>Program_IncReference</b>(ARenderer: <a href="CastleRenderer.TGLRenderer.html">TGLRenderer</a>; Shader: TShader; const ShapeNiceName: string): <a href="CastleRenderer.TShaderProgramCache.html">TShaderProgramCache</a>;</code></td>
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<p>
Shader program cache. We return <a class="normal" href="CastleRenderer.TShaderProgramCache.html">TShaderProgramCache</a>, either taking an existing instance from cache or creating and adding a new one. If we create a new one, we will use Shader to initialize program hash and to create and link actual <a class="normal" href="CastleRenderer.TX3DGLSLProgram.html">TX3DGLSLProgram</a> instance.</p>
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<td class="itemcode"><a name="Program_DecReference"></a><code>procedure <b>Program_DecReference</b>(var ProgramCache: <a href="CastleRenderer.TShaderProgramCache.html">TShaderProgramCache</a>);</code></td>
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