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
|
uniform ivec2 rendertargetdim;
uniform sampler2D colorbuffer;
uniform vec2 layerselection;
uniform sampler2D cocbuffer;
#if __VERSION__ >= 150
layout(points) in;
layout(triangle_strip, max_vertices = 4) out;
#define POS gl_in[0].gl_Position
#else
/* use the EXT_geometry_shader4 way */
#define POS gl_PositionIn[0]
#endif
/* initial uv coordinate */
#if __VERSION__ < 130
varying in vec2 uvcoord[];
varying out vec2 particlecoord;
varying out vec4 color;
#define textureLod texture2DLod
#else
in vec2 uvcoord[];
out vec2 particlecoord;
out vec4 color;
#endif
#define M_PI 3.1415926535897932384626433832795
void main()
{
vec4 coc = textureLod(cocbuffer, uvcoord[0], 0.0);
float offset_val = dot(coc.rg, layerselection);
if (offset_val < 1.0)
return;
vec4 colortex = textureLod(colorbuffer, uvcoord[0], 0.0);
/* find the area the pixel will cover and divide the color by it */
float alpha = 1.0 / (offset_val * offset_val * M_PI);
colortex *= alpha;
colortex.a = alpha;
vec2 offset_far = vec2(offset_val * 0.5) / vec2(rendertargetdim.x, rendertargetdim.y);
gl_Position = POS + vec4(-offset_far.x, -offset_far.y, 0.0, 0.0);
color = colortex;
particlecoord = vec2(-1.0, -1.0);
EmitVertex();
gl_Position = POS + vec4(-offset_far.x, offset_far.y, 0.0, 0.0);
particlecoord = vec2(-1.0, 1.0);
color = colortex;
EmitVertex();
gl_Position = POS + vec4(offset_far.x, -offset_far.y, 0.0, 0.0);
particlecoord = vec2(1.0, -1.0);
color = colortex;
EmitVertex();
gl_Position = POS + vec4(offset_far.x, offset_far.y, 0.0, 0.0);
particlecoord = vec2(1.0, 1.0);
color = colortex;
EmitVertex();
EndPrimitive();
}
|
