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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/**
* @file class1\deferred\terrainF.glsl
*
* $LicenseInfo:firstyear=2023&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2023, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#define TERRAIN_PBR_DETAIL_EMISSIVE 0
#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3
#define TerrainCoord vec4[2]
#elif TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 1
#define TerrainCoord vec2
#endif
out vec4 frag_data[4];
uniform sampler2D alpha_ramp;
// *TODO: More configurable quality level which disables PBR features on machines
// with limited texture availability
// https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#additional-textures
uniform sampler2D detail_0_base_color;
uniform sampler2D detail_1_base_color;
uniform sampler2D detail_2_base_color;
uniform sampler2D detail_3_base_color;
uniform sampler2D detail_0_normal;
uniform sampler2D detail_1_normal;
uniform sampler2D detail_2_normal;
uniform sampler2D detail_3_normal;
uniform sampler2D detail_0_metallic_roughness;
uniform sampler2D detail_1_metallic_roughness;
uniform sampler2D detail_2_metallic_roughness;
uniform sampler2D detail_3_metallic_roughness;
#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE)
uniform sampler2D detail_0_emissive;
uniform sampler2D detail_1_emissive;
uniform sampler2D detail_2_emissive;
uniform sampler2D detail_3_emissive;
#endif
uniform vec4[4] baseColorFactors; // See also vertex_color in pbropaqueV.glsl
uniform vec4 metallicFactors;
uniform vec4 roughnessFactors;
#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE)
uniform vec3[4] emissiveColors;
#endif
uniform vec4 minimum_alphas; // PBR alphaMode: MASK, See: mAlphaCutoff, setAlphaCutoff()
#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3
in vec4[2] vary_coords;
#endif
in vec3 vary_normal;
in vec3 vary_tangent;
flat in float vary_sign;
in vec4 vary_texcoord0;
in vec4 vary_texcoord1;
vec2 encode_normal(vec3 n);
float terrain_mix(vec4 samples, float alpha1, float alpha2, float alphaFinal);
vec3 sample_and_mix_color3(float alpha1, float alpha2, float alphaFinal, TerrainCoord texcoord, vec3[4] factors, sampler2D tex0, sampler2D tex1, sampler2D tex2, sampler2D tex3);
vec4 sample_and_mix_color4(float alpha1, float alpha2, float alphaFinal, TerrainCoord texcoord, vec4[4] factors, sampler2D tex0, sampler2D tex1, sampler2D tex2, sampler2D tex3);
vec3 sample_and_mix_vector3(float alpha1, float alpha2, float alphaFinal, TerrainCoord texcoord, vec3[4] factors, sampler2D tex0, sampler2D tex1, sampler2D tex2, sampler2D tex3);
vec3 sample_and_mix_normal(float alpha1, float alpha2, float alphaFinal, TerrainCoord texcoord, sampler2D tex0, sampler2D tex1, sampler2D tex2, sampler2D tex3);
#if 0 // TODO: Remove
#define TERRAIN_DEBUG 1 // TODO: Remove debug
struct TerrainMix
{
vec4 weight;
int type;
#if TERRAIN_DEBUG
ivec4 usage;
#endif
};
TerrainMix _t_mix(float alpha1, float alpha2, float alphaFinal);
#endif
void main()
{
#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3
TerrainCoord terrain_texcoord = vary_coords;
#elif TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 1
TerrainCoord terrain_texcoord = vary_texcoord0.xy;
#endif
float alpha1 = texture(alpha_ramp, vary_texcoord0.zw).a;
float alpha2 = texture(alpha_ramp,vary_texcoord1.xy).a;
float alphaFinal = texture(alpha_ramp, vary_texcoord1.zw).a;
vec4 col = sample_and_mix_color4(alpha1, alpha2, alphaFinal, terrain_texcoord, baseColorFactors, detail_0_base_color, detail_1_base_color, detail_2_base_color, detail_3_base_color);
float minimum_alpha = terrain_mix(minimum_alphas, alpha1, alpha2, alphaFinal);
if (col.a < minimum_alpha)
{
discard;
}
vec3[4] orm_factors;
orm_factors[0] = vec3(1.0, roughnessFactors.x, metallicFactors.x);
orm_factors[1] = vec3(1.0, roughnessFactors.y, metallicFactors.y);
orm_factors[2] = vec3(1.0, roughnessFactors.z, metallicFactors.z);
orm_factors[3] = vec3(1.0, roughnessFactors.w, metallicFactors.w);
// RGB = Occlusion, Roughness, Metal
// default values, see LLViewerTexture::sDefaultPBRORMImagep
// occlusion 1.0
// roughness 0.0
// metal 0.0
vec3 spec = sample_and_mix_vector3(alpha1, alpha2, alphaFinal, terrain_texcoord, orm_factors, detail_0_metallic_roughness, detail_1_metallic_roughness, detail_2_metallic_roughness, detail_3_metallic_roughness);
#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE)
vec3 emissive = sample_and_mix_color3(alpha1, alpha2, alphaFinal, terrain_texcoord, emissiveColors, detail_0_emissive, detail_1_emissive, detail_2_emissive, detail_3_emissive);
#else
vec3 emissive = vec3(0);
#endif
float base_color_factor_alpha = terrain_mix(vec4(baseColorFactors[0].z, baseColorFactors[1].z, baseColorFactors[2].z, baseColorFactors[3].z), alpha1, alpha2, alphaFinal);
// from mikktspace.com
vec3 vNt = sample_and_mix_normal(alpha1, alpha2, alphaFinal, terrain_texcoord, detail_0_normal, detail_1_normal, detail_2_normal, detail_3_normal);
vec3 vN = vary_normal;
vec3 vT = vary_tangent.xyz;
vec3 vB = vary_sign * cross(vN, vT);
vec3 tnorm = normalize( vNt.x * vT + vNt.y * vB + vNt.z * vN );
tnorm *= gl_FrontFacing ? 1.0 : -1.0;
#if TERRAIN_DEBUG // TODO: Remove
#if 0 // TODO: Remove (terrain weights visualization)
TerrainMix tm = _t_mix(alpha1, alpha2, alphaFinal);
#if 1
// Show full usage and weights
float uw = 0.3;
#if 1
#if 0
vec4 mix_usage = vec4(tm.usage);
#else
vec4 mix_usage = vec4(tm.weight);
#endif
#else
// Version with easier-to-see boundaries of weights vs usage
vec4 mix_usage = mix(vec4(tm.usage),
mix(max(vec4(0.0), sign(tm.weight - 0.01)),
max(vec4(0.0), sign(tm.weight - 0.005)),
0.5),
uw);
#endif
col.xyz = mix_usage.xyz;
col.x = max(col.x, mix_usage.w);
//col.y = 0.0;
//col.z = 0.0;
#else
// Show places where weight > usage + tolerance
float tolerance = 0.005;
vec4 weight_gt_usage = sign(
max(
vec4(0.0),
(tm.weight - (vec4(tm.usage) + vec4(tolerance)))
)
);
col.xyz = weight_gt_usage.xyz;
col.x = max(col.x, weight_gt_usage.w);
#endif
#endif
#if 0 // TODO: Remove (material channel discriminator)
//col.rgb = vec3(0.0, 1.0, 0.0);
//col.rgb = spec.rgb;
//col.rgb = (vNt + 1.0) / 2.0;
//col.rgb = (tnorm + 1.0) / 2.0;
//spec.rgb = vec3(1.0, 1.0, 0.0);
col.rgb = spec.rgb;
tnorm = vary_normal;
emissive = vec3(0);
#endif
#endif
frag_data[0] = max(vec4(col.xyz, 0.0), vec4(0)); // Diffuse
frag_data[1] = max(vec4(spec.rgb, base_color_factor_alpha), vec4(0)); // PBR linear packed Occlusion, Roughness, Metal.
frag_data[2] = max(vec4(encode_normal(tnorm), base_color_factor_alpha, GBUFFER_FLAG_HAS_PBR), vec4(0)); // normal, environment intensity, flags
frag_data[3] = max(vec4(emissive,0), vec4(0)); // PBR sRGB Emissive
}
|
