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
204
205
206
207
208
209
210
|
#ifndef __TESSELLATION_INC
#define __TESSELLATION_INC
#include "globals.cginc"
#include "interpolators.cginc"
#include "math.cginc"
#include "shatter_wave.cginc"
#include "trochoid.cginc"
//ifex _Tessellation_Enabled==0
struct tess_factors {
float edge[3] : SV_TessFactor;
float inside : SV_InsideTessFactor;
};
bool cullPatch(float4 p0, float4 p1, float4 p2, float bias) {
return
(p0.x < -p0.w - bias && p1.x < -p1.w - bias && p2.x < -p2.w - bias) ||
(p0.x > p0.w + bias && p1.x > p1.w + bias && p2.x > p2.w + bias) ||
(p0.y < -p0.w - bias && p1.y < -p1.w - bias && p2.y < -p2.w - bias) ||
(p0.y > p0.w + bias && p1.y > p1.w + bias && p2.y > p2.w + bias) ||
(p0.z < -p0.w - bias && p1.z < -p1.w - bias && p2.z < -p2.w - bias) ||
(p0.z > p0.w + bias && p1.z > p1.w + bias && p2.z > p2.w + bias);
}
#if defined(_TESSELLATION_HEIGHTMAP_0) || defined(_TESSELLATION_HEIGHTMAP_1) || defined(_TESSELLATION_HEIGHTMAP_2) || defined(_TESSELLATION_HEIGHTMAP_3) || defined(_TESSELLATION_HEIGHTMAP_4) || defined(_TESSELLATION_HEIGHTMAP_5) || defined(_TESSELLATION_HEIGHTMAP_6) || defined(_TESSELLATION_HEIGHTMAP_7)
#define _TESSELLATION_HEIGHTMAP
#endif
float4 applyHeightmap(float4 objPos, float2 uv, float3 normal, float3 tangent) {
#if defined(_TESSELLATION) && defined(_TESSELLATION_HEIGHTMAP)
float3 height = 0;
#if defined(_TESSELLATION_HEIGHTMAP_0)
float3 heightmap_0_sample = _Tessellation_Heightmap_0.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_0_ST.xy, 0);
height += heightmap_0_sample * _Tessellation_Heightmap_0_Scale + _Tessellation_Heightmap_0_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_1)
float3 heightmap_1_sample = _Tessellation_Heightmap_1.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_1_ST.xy, 0);
height += heightmap_1_sample * _Tessellation_Heightmap_1_Scale + _Tessellation_Heightmap_1_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_2)
float3 heightmap_2_sample = _Tessellation_Heightmap_2.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_2_ST.xy, 0);
height += heightmap_2_sample * _Tessellation_Heightmap_2_Scale + _Tessellation_Heightmap_2_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_3)
float3 heightmap_3_sample = _Tessellation_Heightmap_3.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_3_ST.xy, 0);
height += heightmap_3_sample * _Tessellation_Heightmap_3_Scale + _Tessellation_Heightmap_3_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_4)
float3 heightmap_4_sample = _Tessellation_Heightmap_4.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_4_ST.xy, 0);
height += heightmap_4_sample * _Tessellation_Heightmap_4_Scale + _Tessellation_Heightmap_4_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_5)
float3 heightmap_5_sample = _Tessellation_Heightmap_5.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_5_ST.xy, 0);
height += heightmap_5_sample * _Tessellation_Heightmap_5_Scale + _Tessellation_Heightmap_5_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_6)
float3 heightmap_6_sample = _Tessellation_Heightmap_6.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_6_ST.xy, 0);
height += heightmap_6_sample * _Tessellation_Heightmap_6_Scale + _Tessellation_Heightmap_6_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_7)
float3 heightmap_7_sample = _Tessellation_Heightmap_7.SampleLevel(bilinear_repeat_s,
uv * _Tessellation_Heightmap_7_ST.xy, 0);
height += heightmap_7_sample * _Tessellation_Heightmap_7_Scale + _Tessellation_Heightmap_7_Offset;
#endif
#if defined(_TESSELLATION_HEIGHTMAP_WORLD_SPACE)
objPos.xyz += mul(unity_WorldToObject, height).xyz;
#else
#if defined(_TESSELLATION_HEIGHTMAP_DIRECTION_CONTROL)
float3 binormal = cross(tangent, normal);
float3 heightmap_direction = normalize(
normalize(normal) * _Tessellation_Heightmap_Direction_Control_Vector.x +
normalize(tangent) * _Tessellation_Heightmap_Direction_Control_Vector.y +
normalize(binormal) * _Tessellation_Heightmap_Direction_Control_Vector.z
);
#else
float3 heightmap_direction = normal;
#endif
objPos.xyz += heightmap_direction * height;
#endif
#endif // _TESSELLATION_HEIGHTMAP
return objPos;
}
tess_factors patch_constant(InputPatch<v2f, 3> patch) {
tess_factors f;
#if defined(_TESSELLATION)
float4 p0 = patch[0].pos;
float4 p1 = patch[1].pos;
float4 p2 = patch[2].pos;
[branch]
if (cullPatch(p0, p1, p2, _Tessellation_Frustum_Culling_Bias)) {
f.edge[0] = 1;
f.edge[1] = 1;
f.edge[2] = 1;
f.inside = 1;
return f;
}
// https://catlikecoding.com/unity/tutorials/advanced-rendering/tessellation/
float2 p0_clip = p0.xy / p0.w;
float2 p1_clip = p1.xy / p1.w;
float2 p2_clip = p2.xy / p2.w;
float l01 = distance(p0_clip, p1_clip);
float l12 = distance(p1_clip, p2_clip);
float l20 = distance(p2_clip, p0_clip);
float edgeLength = _Tessellation_Factor;
float edge01 = l01 * edgeLength;
float edge12 = l12 * edgeLength;
float edge20 = l20 * edgeLength;
float k = _Tessellation_Falloff_Factor;
f.edge[0] = min(_Tessellation_Factor, k * edge12);
f.edge[1] = min(_Tessellation_Factor, k * edge20);
f.edge[2] = min(_Tessellation_Factor, k * edge01);
f.inside = (f.edge[0] + f.edge[1] + f.edge[2]) * 0.333333f;
#else
f.edge[0] = 1;
f.edge[1] = 1;
f.edge[2] = 1;
f.inside = 1;
#endif
return f;
}
[UNITY_domain("tri")]
[UNITY_outputcontrolpoints(3)]
[UNITY_outputtopology("triangle_cw")]
[UNITY_partitioning("fractional_odd")]
[UNITY_patchconstantfunc("patch_constant")]
v2f hull(
InputPatch<v2f, 3> patch,
uint id : SV_OutputControlPointID)
{
return patch[id];
}
[UNITY_domain("tri")]
v2f domain(
tess_factors factors,
OutputPatch<v2f, 3> patch,
float3 baryc : SV_DomainLocation)
{
v2f o = (v2f) 0;
#define DOMAIN_INTERP(fieldName) \
patch[0].fieldName * baryc.x + \
patch[1].fieldName * baryc.y + \
patch[2].fieldName * baryc.z
#if defined(_TESSELLATION)
o.objPos = DOMAIN_INTERP(tpos);
#else
o.objPos = DOMAIN_INTERP(objPos);
#endif
o.normal = DOMAIN_INTERP(normal);
o.tangent = DOMAIN_INTERP(tangent);
o.uv01 = DOMAIN_INTERP(uv01);
o.uv23 = DOMAIN_INTERP(uv23);
o.vertexLight = DOMAIN_INTERP(vertexLight);
#if defined(V2F_COLOR)
o.color = DOMAIN_INTERP(color);
#endif
#if defined(V2F_ORIG_POS)
o.orig_pos = DOMAIN_INTERP(orig_pos);
#endif
#if defined(_TESSELLATION) && defined(_TROCHOID)
o.objPos.xyz = trochoid_map(o.orig_pos.xyz);
#endif
#if defined(_TESSELLATION) && defined(_SHATTER_WAVE)
#if defined(OUTLINE_PASS)
shatterWaveVert(o.objPos.xyz, -o.normal, o.tangent);
#else
shatterWaveVert(o.objPos.xyz, o.normal, o.tangent);
#endif
#endif
o.objPos = applyHeightmap(o.objPos, o.uv01.xy, o.normal, o.tangent);
o.pos = UnityObjectToClipPos(o.objPos);
//UNITY_TRANSFER_LIGHTING(o, v);
UNITY_TRANSFER_INSTANCE_ID(patch[0], o);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
#if defined(SHADOW_CASTER_PASS)
TRANSFER_SHADOW_CASTER_NORMALOFFSET(o);
#endif
return o;
}
//endex
#endif // __TESSELLATION_INC
|
