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
|
#version 450
// PN patch data
struct PnPatch
{
float b210;
float b120;
float b021;
float b012;
float b102;
float b201;
float b111;
float n110;
float n011;
float n101;
};
/*layout (set = 0, binding = 0) uniform UBO {
mat4 projection;
mat4 model;
mat4 view;
} ubo;*/
const float tessLevel = 3.0;
layout (vertices=3) out;
layout (location = 0) in vec3 inNormal[];
layout (location = 1) in vec2 inUV0[];
layout (location = 2) in vec2 inUV1[];
layout (location = 3) in vec4 inColor[];
layout(location = 0) out vec3 outNormal[3];
layout(location = 3) out vec2 outUV0[3];
layout(location = 6) out vec2 outUV1[3];
layout(location = 9) patch out vec4 outColor;
layout(location = 10) out PnPatch outPatch[3];
float wij(int i, int j)
{
return dot(gl_in[j].gl_Position.xyz - gl_in[i].gl_Position.xyz, inNormal[i]);
}
float vij(int i, int j)
{
vec3 Pj_minus_Pi = gl_in[j].gl_Position.xyz
- gl_in[i].gl_Position.xyz;
vec3 Ni_plus_Nj = inNormal[i]+inNormal[j];
return 2.0*dot(Pj_minus_Pi, Ni_plus_Nj)/dot(Pj_minus_Pi, Pj_minus_Pi);
}
void main()
{
// get data
gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
outNormal[gl_InvocationID] = inNormal[gl_InvocationID];
outUV0[gl_InvocationID] = inUV0[gl_InvocationID];
outUV1[gl_InvocationID] = inUV1[gl_InvocationID];
outColor = inColor[gl_InvocationID];
// set base
float P0 = gl_in[0].gl_Position[gl_InvocationID];
float P1 = gl_in[1].gl_Position[gl_InvocationID];
float P2 = gl_in[2].gl_Position[gl_InvocationID];
float N0 = inNormal[0][gl_InvocationID];
float N1 = inNormal[1][gl_InvocationID];
float N2 = inNormal[2][gl_InvocationID];
// compute control points
outPatch[gl_InvocationID].b210 = (2.0*P0 + P1 - wij(0,1)*N0)/3.0;
outPatch[gl_InvocationID].b120 = (2.0*P1 + P0 - wij(1,0)*N1)/3.0;
outPatch[gl_InvocationID].b021 = (2.0*P1 + P2 - wij(1,2)*N1)/3.0;
outPatch[gl_InvocationID].b012 = (2.0*P2 + P1 - wij(2,1)*N2)/3.0;
outPatch[gl_InvocationID].b102 = (2.0*P2 + P0 - wij(2,0)*N2)/3.0;
outPatch[gl_InvocationID].b201 = (2.0*P0 + P2 - wij(0,2)*N0)/3.0;
float E = ( outPatch[gl_InvocationID].b210
+ outPatch[gl_InvocationID].b120
+ outPatch[gl_InvocationID].b021
+ outPatch[gl_InvocationID].b012
+ outPatch[gl_InvocationID].b102
+ outPatch[gl_InvocationID].b201 ) / 6.0;
float V = (P0 + P1 + P2)/3.0;
outPatch[gl_InvocationID].b111 = E + (E - V)*0.5;
outPatch[gl_InvocationID].n110 = N0+N1-vij(0,1)*(P1-P0);
outPatch[gl_InvocationID].n011 = N1+N2-vij(1,2)*(P2-P1);
outPatch[gl_InvocationID].n101 = N2+N0-vij(2,0)*(P0-P2);
// set tess levels
gl_TessLevelOuter[gl_InvocationID] = tessLevel;
gl_TessLevelInner[0] = tessLevel;
}
|
