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
|
#version 420 compatibility
//#extension GL_ARB_uniform_buffer_object : enable
//#extension GL_EXT_gpu_shader4 : enable
struct SDecal {
vec3 pos;
float rot;
vec4 texcoords;
vec2 size;
float alpha;
};
/*layout(std140) uniform decals
{
SDecal decals_[1000];
};*/
layout(binding=7) uniform samplerBuffer decalInfo;
SDecal GetDecalInfo() {
//instanceID = gl_InstanceID;
//return decals_[gl_InstanceID];
vec4 info1 = texelFetch(decalInfo, gl_InstanceID*3 + 0);
vec4 info2 = texelFetch(decalInfo, gl_InstanceID*3 + 1);
vec4 info3 = texelFetch(decalInfo, gl_InstanceID*3 + 2);
SDecal decal;
decal.pos = info1.xyz;
decal.rot = info1.w;
decal.texcoords = info2.xyzw;
decal.size = info3.xy;
decal.alpha = info3.z;
return decal;
}
uniform vec3 camPos;
//flat out int instanceID;
flat out SDecal decal;
flat out mat2 rot;
void main() {
decal = GetDecalInfo();
// invert vertex winding when being inside
// we have culling enabled and normally draw the frontfaces, when being inside we need to draw the backfaces
float vertex_winding = mix(1.0, -1.0, float(any(lessThanEqual(abs(decal.pos - camPos), decal.size.xxy))));
rot = mat2(cos(decal.rot), sin(decal.rot), -sin(decal.rot), cos(decal.rot));
vec3 v = gl_Vertex.xyz * decal.size.xxy;
v *= vertex_winding;
v.xz = rot * v.xz;
gl_Position = gl_ModelViewProjectionMatrix * vec4(decal.pos + v, 1.0);
}
|
