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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
precision lowp int;
precision lowp float;
VARYING vec3 vColor;
VARYING vec3 vPos;
VARYING vec3 vNormal;
VARYING vec3 vBinormal;
VARYING vec3 vTangent;
VARYING vec3 vViewVec;
VARYING vec2 vTexcoord;
VARYING mat3 TBNMat;
vec3 calculateTangent(vec3 normal)
{
// Calculate the tangent vector
vec3 Q1 = vec3(1.0, 0.0, 0.0);
vec3 Q2 = vec3(0.0, 1.0, 0.0);
vec3 tangent = normalize(Q1 * Q2.y - Q1.y * Q2);
// Calculate the handedness of the tangent basis
float handedness = (dot(cross(normal, tangent), Q2) < 0.0) ? -1.0 : 1.0;
return handedness * tangent;
}
vec3 calculateBinormal(vec3 normal, vec3 tangent)
{
return normalize(cross(normal, tangent));
}
void MAIN()
{
vColor = COLOR.rgb;
vPos = VERTEX.xyz;
vNormal = normalize(NORMAL_MATRIX * NORMAL);
vTangent = calculateTangent(vNormal);
vBinormal = calculateBinormal(vNormal, vTangent);
TBNMat = mat3(vTangent, vBinormal, vNormal);
vTexcoord = UV0;
vViewVec = normalize(CAMERA_POSITION - (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz);
}