1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/****************************************************************************
**
** 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 SHADOW_MAPPING_GLSLLIB
#define SHADOW_MAPPING_GLSLLIB
#include "depthpass.glsllib"
float sampleParaboloid( in sampler2D shadowMap, in vec4 shadowControls, in mat4 shadowMatrix, in vec3 worldPos, in vec2 cameraProps, out vec2 smpUV )
{
vec4 projCoord = shadowMatrix * vec4( worldPos, 1.0 );
vec3 smpCoord = projCoord.xyz / projCoord.w;
float ptDepth = depthValueToLinearDistance( 1.0 - smpCoord.z, cameraProps );
ptDepth = (ptDepth - cameraProps.x) / (cameraProps.y - cameraProps.x);
smpCoord = normalize( smpCoord.xyz );
smpCoord.xy /= -( smpCoord.z + 1.0 );
smpCoord.xy = vec2(1.0) - smpCoord.xy;
smpCoord.xy *= 0.5;
smpUV = smpCoord.xy; // This is just for debug purposes to ensure what the sampled UV cooord is.
float sampleDepth = texture( shadowMap, smpCoord.xy ).x + shadowControls.x;
sampleDepth *= sampleDepth;
ptDepth *= ptDepth;
float shadowFac = min(1.0, exp(shadowControls.y * sampleDepth * sampleDepth) / exp(shadowControls.y * ptDepth * ptDepth));
smpUV.xy *= shadowFac;
return shadowFac;
}
float sampleCubemap( in samplerCube shadowCube, in vec4 shadowControls, in mat4 shadowViewMat, in vec3 lightPos, in vec3 worldPos, in vec2 cameraProps )
{
vec3 viewDir = worldPos - vec3(lightPos.x, lightPos.y, lightPos.z);
float ptDepth = length(viewDir.xyz);
vec4 viewCoord = shadowViewMat * vec4( viewDir.xyz, 0.0 );
viewCoord.xyz /= ptDepth;
ptDepth = clamp((ptDepth - 1.0) / (cameraProps.y - 1.0), 0.0, 1.0);
float smpDepth = textureCube( shadowCube, viewDir.xyz ).x + shadowControls.x;
float shadowFac = min(1.0, exp(shadowControls.y * smpDepth) / exp(shadowControls.y * ptDepth));
return shadowFac;
}
float sampleOrthographic( in sampler2D shadowMap, in vec4 shadowControls, in mat4 shadowMatrix, in vec3 worldPos, in vec2 cameraProps )
{
vec4 projCoord = shadowMatrix * vec4( worldPos, 1.0 );
vec3 smpCoord = projCoord.xyz / projCoord.w;
float sampleDepth = texture( shadowMap, smpCoord.xy ).x + shadowControls.x;
return min(1.0, exp(shadowControls.y * sampleDepth) / exp(shadowControls.y * smpCoord.z));
}
struct ParaboloidMapResult
{
vec4 m_Position;
vec4 m_WorldPos;
};
ParaboloidMapResult VertexParaboloidDepth(vec3 pos, mat4 inMVP)
{
vec4 glPos = inMVP * vec4( pos, 1.0 );
glPos /= glPos.w;
glPos.xyz = normalize( glPos.xyz );
vec4 world_pos;
world_pos.w = glPos.z;
glPos.xy /= glPos.z + 1.0;
world_pos.xyz = pos.xyz;
ParaboloidMapResult retval;
retval.m_Position = glPos;
retval.m_WorldPos = world_pos;
return retval;
}
#endif
|
