depthpass.glsllib - mozsearch

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// Copyright (C) 2014 NVIDIA Corporation.

// Copyright (C) 2023 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef DEPTHPASS_GLSLIB

#define DEPTHPASS_GLSLIB 1

float qt_getDepthValue( vec4 depth_texture_sample, vec2 cameraProperties )

#if __VERSION__ >= 300

    float zNear = cameraProperties.x;

    float zFar = cameraProperties.y;

    float zRange = zFar - zNear;

    float z_b = depth_texture_sample.x;

    float z_n = 2.0 * z_b - 1.0;

    float z_e = 2.0 * zNear * zFar / (zFar + zNear - z_n * (zRange));

    return 1.0 - ((z_e - cameraProperties.x) / (zRange));

#else

    return depth_texture_sample.x + (depth_texture_sample.y / 255.0);

#endif

float qt_depthValueToLinearDistance( float depth_value, vec2 cameraProperties )

    float FarClipDistance = cameraProperties.y;

    float NearClipDistance = cameraProperties.x;

    float DepthRange = FarClipDistance - NearClipDistance;

    float linearDepth = NearClipDistance + (DepthRange * (1.0 - depth_value));

    return linearDepth;

#endif