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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifdef QQ3D_SHADER_META
/*{
"uniforms": [
{ "type": "vec2", "name": "qt_cameraProperties" },
{ "type": "vec3", "name": "qt_cameraPosition", "multiview_dependent": true },
{ "type": "vec4", "name": "qt_fogColor" },
{ "type": "vec4", "name": "qt_fogDepthProperties" },
{ "type": "vec4", "name": "qt_fogHeightProperties" },
{ "type": "vec4", "name": "qt_fogTransmitProperties" }
]
}*/
#endif // QQ3D_SHADER_META
// qt_fogColor = (fogColor.x, fogColor.y, fogColor.z, fogDensity)
// qt_fogDepthProperties = (fogDepthBegin, fogDepthEnd, fogDepthCurve, fogDepthEnabled ? 1.0 : 0.0)
// qt_fogHeightProperties = (fogHeightMin, fogHeightMax, fogHeightCurve, fogHeightEnabled ? 1.0 : 0.0)
// qt_fogTransmitProperties = (fogTransmitCurve, 0.0, 0.0, fogTransmitEnabled ? 1.0 : 0.0)
void calculateFog(inout vec3 emission, inout vec3 specular, inout vec3 diffuse) {
float fogAmount = 0.0;
vec3 fogColor = qt_fogColor.rgb;
if (qt_fogDepthProperties.w > 0.5) {
float fogFar = qt_fogDepthProperties.y > 0.0 ? qt_fogDepthProperties.y : qt_cameraProperties.y;
#if QSHADER_VIEW_COUNT >= 2
float fogZ = smoothstep(qt_fogDepthProperties.x, fogFar, length(qt_cameraPosition[qt_viewIndex] - qt_varWorldPos));
#else
float fogZ = smoothstep(qt_fogDepthProperties.x, fogFar, length(qt_cameraPosition - qt_varWorldPos));
#endif
fogAmount = pow(fogZ, qt_fogDepthProperties.z) * qt_fogColor.a;
if (qt_fogTransmitProperties.w > 0.5) {
vec3 totalLight = emission + specular + diffuse;
float transmit = pow(fogZ, qt_fogTransmitProperties.x);
fogColor = mix(max(totalLight, fogColor), fogColor, transmit);
}
}
if (qt_fogHeightProperties.w > 0.5) {
fogAmount = max(fogAmount, pow(smoothstep(qt_fogHeightProperties.x, qt_fogHeightProperties.y, qt_varWorldPos.y), qt_fogHeightProperties.w));
}
float fogMod = 1.0 - fogAmount;
emission = emission * fogMod + fogColor * fogAmount;
specular *= fogMod;
diffuse *= fogMod;
}
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