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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_BUMP_TEXTURE_GLSLLIB
#define FILE_BUMP_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
// compute a normal based on a heightfield style bump texture
// example call:
// fileBumpTexture(bump_texture, bump_amount, mono_average
// , transformCoordinate(
// rotationTranslationScale(
// vec3( 0.000000, 0.000000, 0.000000 )
// , vec3( 0.000000, 0.000000, 0.000000 )
// , vec3( texture_tiling[0], texture_tiling[1], 1.000000 ) )
// , textureCoordinateInfo( texCoord0, tangent, binormal ) )
// , vec2( 0.000000, 1.000000 ), vec2( 0.000000, 1.000000 )
// , wrap_repeat, wrap_repeat, normal );
vec3 fileBumpTexture( in sampler2D sampler, in float factor, in int bumpSource
, in texture_coordinate_info uvw
, in vec2 cropU, in vec2 cropV
, in int wrapU, in int wrapV, in vec3 normal )
{
vec2 bumpMapSize = vec2( textureSize( sampler, 0 ) );
float bumpMapLevels = log2( max( bumpMapSize.x, bumpMapSize.y ) );
// simulate textureQueryLod
vec2 dx = dFdx( uvw.position.xy * bumpMapSize.x );
vec2 dy = dFdy( uvw.position.xy * bumpMapSize.y );
float px = dot( dx, dx );
float py = dot( dy, dy );
float maxlod = 0.5 * log2( max( px, py ) ); // log2(sqrt()) = 0.5*log2()
float minlod = 0.5 * log2( min( px, py ) );
float lod = max(0.0, min( maxlod, bumpMapLevels ));
// invert factor
float invFactor = -factor;
// currently no lod supported we use 3.3 GL
//float lod = textureQueryLod( sampler, uvw.position.xy ).x;
vec2 size = mix( vec2( textureSize( sampler, int( floor( lod ) ) ) ), vec2( textureSize( sampler, int( ceil( lod ) ) ) ), fract( lod ) );
vec2 unitStep = 1.0f / size;
// Add an inveres scale to keep the original gradient values
// this makes the bumps a lot smoother.
// Or we could do it like in iRay and sample always at original size.
// But this makes me feel better.
vec2 scale = size / bumpMapSize;
float du = monoChannel( textureLod( sampler, vec2( uvw.position.x + unitStep.x, uvw.position.y ), lod ), bumpSource )
- monoChannel( textureLod( sampler, vec2( uvw.position.x, uvw.position.y ), lod ), bumpSource );
float dv = monoChannel( textureLod( sampler, vec2( uvw.position.x, uvw.position.y + unitStep.y ), lod ), bumpSource )
- monoChannel( textureLod( sampler, vec2( uvw.position.x, uvw.position.y ), lod ), bumpSource );
vec3 n = normalize(vec3(invFactor * scale.x * du, invFactor * scale.x * dv, 1.0));
n = n.x*uvw.tangent_u + n.y*uvw.tangent_v + n.z*normal;
return normalize(normal + n);
}
#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 simplerFileBumpTexture( in sampler2D sampler, in float factor, vec2 texCoord, vec3 tangent, vec3 binormal, vec3 normal )
{
return fileBumpTexture( sampler, factor, mono_average
, textureCoordinateInfo( vec3( texCoord.x, texCoord.y, 0.0 ), tangent, binormal )
, vec2( 0.000000, 1.000000 ), vec2( 0.000000, 1.000000 )
, wrap_repeat, wrap_repeat, normal );
}
#endif
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