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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
float qt_calcRGBAvg(in vec4 rgba)
{
return (rgba.r + rgba.g + rgba.b) / 3.0;
}
vec3 qt_defaultMaterialBumpNoLod(in sampler2D inSampler, in float factor,
in vec2 texCoord, in vec3 tangent, in vec3 binormal,
in vec3 normal, in vec2 bumpSize)
{
// invert factor
float invFactor = -factor;
vec2 unitStep = 1.0 / bumpSize;
float du = qt_calcRGBAvg(texture2D(inSampler, vec2(texCoord.x + unitStep.x, texCoord.y)))
- qt_calcRGBAvg(texture2D(inSampler, vec2(texCoord.x, texCoord.y)));
float dv = qt_calcRGBAvg(texture2D(inSampler, vec2(texCoord.x, texCoord.y + unitStep.y)))
- qt_calcRGBAvg(texture2D(inSampler, vec2(texCoord.x, texCoord.y)));
vec3 n = normalize(vec3(invFactor * du, invFactor * dv, 1.0));
n = n.x * normalize(tangent) + n.y * normalize(binormal) + n.z * normal;
return normalize(normal + n);
}
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