author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 07:56:43 +0200 | |
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/* |
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* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Declares MHuiSegmentedTexture interface class for texture image objects. |
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* |
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*/ |
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#ifndef __HUISEGMENTEDTEXTURE_H__ |
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#define __HUISEGMENTEDTEXTURE_H__ |
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#include <e32base.h> |
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/* Forward declarations. */ |
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class THuiTextureHandle; |
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/** |
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* MHuiSegmentedTexture is an abstract base class for texture image objects. |
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* It specifies one or more texture images that comprise a larger (virtual) image. |
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* THuiImage refers to objects that implement MHuiSegmentedTexture. |
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* |
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* A segmented texture is a texture that is composed of one or more segments. |
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* Each segment has a position, dimensions, and a name that identifies the texture |
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* image of the segment. The purpose is that it is possible to compose large images |
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* out of smaller segments. The segments can overlap. |
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* |
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* One use case is where the OpenGL texture size is limited (e.g., 256x256). A class |
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* implementing MHuiSegmentedTexture would in this case split the uploaded source |
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* image to multiple segments and create a different OpenGL texture for each. All |
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* of the segments would still be hidden inside the implementing |
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* MHuiSegmentedTexture-derived class, though, so it could be treated as a single entity. |
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* |
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* When an object implements the MHuiSegmentedTexture interface, it can be drawn using |
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* the DrawImage() methods in CHuiGc (since THuiImage specifies the image as |
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* MHuiSegmentedTexture). |
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* |
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* @note CHuiGc and CHuiTexture only support single-segment textures at the moment. |
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* @see CHuiGles10Texture |
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* @see CHuiTexture |
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* @see CHuiGc |
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* @see THuiImage |
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* |
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*/ |
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class MHuiSegmentedTexture |
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{ |
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public: |
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/** @beginAPI */ |
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/** Construction / Destruction */ |
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/** |
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* Virtual destructor, needed because we have a couple of implemented |
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* methods. |
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*/ |
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IMPORT_C virtual ~MHuiSegmentedTexture(); |
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/* Methods. */ |
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/** |
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* Returns the logical size of this texture. Ie. the original size of the |
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* image represented with this texture. This size is independent of the |
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* possible segmentation of this texture. |
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* |
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* On the other hand the actual texture size may |
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* vary across segments and typically has some driver/hw limitations. |
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* |
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* Note that all the segments must be contained inside the logical |
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* area defined with this function. |
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* |
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* @see SegmentSize() To return logical size for a particular texture segment. |
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* @see SegmentOffset() To return logical position for a particular texture segment. |
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* @see SegmentTextureSize() To return texture size for a segment. |
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*/ |
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virtual TSize Size() const = 0; |
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/** |
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* Determines how many segments the texture has. Will return 1 if |
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* the texture is not segmented. |
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* |
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* @return Number of segments in this texture. |
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*/ |
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virtual TInt SegmentCount() const = 0; |
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/** |
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* Determines the texture name of a segment. For example with |
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* OpenGL ES renderer, this will be the texture id generated |
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* with glGenTextures(). |
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* |
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* @param aSegment Segment index to access. |
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*/ |
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virtual TUint SegmentName(TInt aSegment) const = 0; |
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/** |
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* Determines the logical size of a texture segment. |
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* Can be non-power-of-two (NPOT) and may be different |
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* from the actual texture size. |
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* |
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* @param aSegment Valid segment index for this texture. |
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* @see Size() to return logical size of the whole texture. |
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* @see SegmentTextureSize() to determine the actual resolution of |
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* the texture. |
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*/ |
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virtual TSize SegmentSize(TInt aSegment) const = 0; |
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/** |
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* Determines the actual resolution of the texture used |
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* by the segment. Most likely only Power-of-Two, unless NPOT |
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* supported by the graphics library. |
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* |
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* @param aSegment Valid segment index for this texture. |
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*/ |
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virtual TSize SegmentTextureSize(TInt aSegment) const = 0; |
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/** |
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* Determines the logical offset for a texture segment. |
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* |
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* @param aSegment Valid segment index for this texture. |
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*/ |
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virtual TPoint SegmentOffset(TInt aSegment) const = 0; |
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/** |
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* Returns a handle to given texture segment. Defaults to first segment. |
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*/ |
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IMPORT_C THuiTextureHandle Handle(TInt aSegment = 0) const; |
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/** |
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* Binds given texture segment to the texture target. Binding makes |
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* the texture segment active. |
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* |
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* @param aSegment Index of a segment. Defaults to the first segment. |
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* @param aTextureUnit Which (multi-)texture unit to bind to. The default |
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* value binds to the first texture unit (single-texturing mode). |
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* @see SegmentCount() to get the number of available segments. |
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*/ |
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IMPORT_C void Bind(TInt aSegment = 0, TInt aTextureUnit = 0) const; |
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/** @endAPI */ |
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}; |
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#endif // __HUISEGMENTEDTEXTURE_H__ |