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/****************************************************************************
**
** Copyright (C) 2014 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef FILE_NORMAL_TEXTURE_GLSLLIB
#define FILE_NORMAL_TEXTURE_GLSLLIB
#ifdef QT3DS_DEFINE_API
#include "luminance.glsllib"
#include "monoChannel.glsllib"
#include "textureCoordinateInfo.glsllib"
#define wrap_clamp 0
#define wrap_repeat 1
#define wrap_mirrored_repeat 2
#include "rotationTranslationScale.glsllib"
#include "transformCoordinate.glsllib"
#endif
int modulo(int a, int b)
{
int k = (a / b);
return a - k*b;
}
//interpreting the color values of a bitmap as a vector in tangent space
vec3 tangentSpaceNormalTexture( in sampler2D tex, in float factor, in bool flipTangentU, in bool flipTangentV
, in texture_coordinate_info uvw, in vec2 cropU, in vec2 cropV, in int wrapU, in int wrapV )
{
// if we mirror repeat a tangent space texture, tangent space needs to be flipped for every other tile
bool flipU = flipTangentU;
bool flipV = flipTangentV;
if ( wrapU == wrap_mirrored_repeat )
{
if ( ( ( 0.0 < uvw.position.x ) && ( modulo(int( uvw.position.x ), 2) == 1 ) )
|| ( ( uvw.position.x < 0.0 ) && ( modulo(int( uvw.position.x ), 2) == 0 ) ) )
{
flipU = !flipU;
}
if ( ( ( 0.0 < uvw.position.y ) && ( modulo(int( uvw.position.y ), 2) == 1 ) )
|| ( ( uvw.position.y < 0.0 ) && ( modulo(int( uvw.position.y ), 2) == 0 ) ) )
{
flipV = !flipV;
}
}
vec3 tangent = 2.0 * texture( tex, uvw.position.xy ).xyz - 1.0;
vec3 tangentU = normalize( flipU ? -uvw.tangent_u : uvw.tangent_u );
vec3 tangentV = normalize( flipV ? -uvw.tangent_v : uvw.tangent_v );
vec3 normal = normalize( cross( tangentU, tangentV ) );
return( mix( normal, normalize( tangent.x * tangentU - tangent.y * tangentV + tangent.z * normal ), factor ) );
}
#include "textureCoordinateInfo.glsllib"
//Simpler version built to run from UIC image data
//In our case, we have already generated the texture coordinate x,y position
//TODO - figure out if we need to manipulate tangent_u, tangent_v.
vec3 defaultMaterialFileNormalTexture( in sampler2D sampler, in float factor, vec2 texCoord, vec3 tangent, vec3 binormal )
{
// factor should be in [0,1] range
return tangentSpaceNormalTexture( sampler, clamp(factor, 0.0, 1.0), false, false
, textureCoordinateInfo( vec3( texCoord.x, texCoord.y, 0.0 ), tangent, binormal )
, vec2( 0.000000, 1.000000 ), vec2( 0.000000, 1.000000 )
, wrap_repeat, wrap_repeat);
}
#endif
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