graphicsdeviceinterface/screendriver/inc/CoordTransformation.inl
author Gareth Stockwell <gareth.stockwell@accenture.com>
Fri, 05 Nov 2010 17:31:20 +0000
branchbug235_bringup_0
changeset 215 097e92a68d68
parent 0 5d03bc08d59c
permissions -rw-r--r--
Added GLES 1.x spinning cube-rendering code to eglbringuptest The coordinate, color and index data are uploaded to server-side buffers by the CGLES1Cube::KhrSetup function. CGLES1Cube::KhrPaint just sets the view matrix and issues a draw command. Which demo to display can be selected by passing its name on the command line, e.g. eglbringuptest vgline eglbringuptest gles1cube If no name is provided, the application defaults to vgline.
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// Copyright (c) 2004-2009 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:
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// Converts logical coordinate value to physical coordinate value.
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// Then adjusts the value, assuming that it must be within the drawing rectangle.
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// The first, "<0" check is arguable - should it be there or not!?
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// Because it HIDES negative values of "x" coordinate, so possible programmer's errors!
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// But with used logical to physical transformation it is possible that some logical
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// coordinate value might be transformed to negative physical coordinate value and 
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// then it has to be checked and set to 0.
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// 
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//
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inline TInt Log2Phys(TInt aCoordVal, TInt aScalingOrigin, TInt aScalingFactor, TInt aSize) 
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	{
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	aCoordVal = aScalingOrigin + aCoordVal * aScalingFactor;
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	return aCoordVal < 0 ? 0 : aCoordVal >= aSize ? (aSize - 1) : aCoordVal;
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	}
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//Converts logical coordinate value to physical coordinate value.
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//Then adjusts the value, assuming that it represents right-bottom coordinate of the logical 
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//rectangle. The first, "<0" check is arguable - should it be there or not!?
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//Because it HIDES negative values of "x" coordinate, so possible programmer's errors!
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//But with used logical to physical transformation it is possible that some logical
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//coordinate value is transformed to negative physical coordinate value and then it has to
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//be checked and set to 0.
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inline TInt RBtmLog2Phys(TInt aCoordVal, TInt aScalingOrigin, TInt aScalingFactor, TInt aSize) 
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	{
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	aCoordVal = aScalingOrigin + aCoordVal * aScalingFactor;
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	return aCoordVal < 0 ? 0 : aCoordVal > aSize ? aSize : aCoordVal;
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	}
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