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
|
uniform vec2 screenres;
uniform sampler2D depthtex;
uniform mat4 WinMatrix;
/* Matcap */
uniform sampler2DArray matcaps;
uniform vec3 matcaps_color[24];
/* Screen Space Occlusion */
/* store the view space vectors for the corners of the view frustum here.
* It helps to quickly reconstruct view space vectors by using uv coordinates,
* see http://www.derschmale.com/2014/01/26/reconstructing-positions-from-the-depth-buffer */
uniform vec4 viewvecs[3];
uniform vec4 ssao_params;
uniform sampler2D ssao_jitter;
/* Material Parameters packed in an UBO */
struct Material {
vec4 ssao_params_var;
vec4 matcap_hsv_id;
vec4 matcap_rot; /* vec4 to ensure 16 bytes alignement (don't trust compiler) */
};
layout(std140) uniform samples_block {
vec4 ssao_samples[500];
};
layout(std140) uniform material_block {
Material matcaps_param[MAX_MATERIAL];
};
uniform int mat_id;
/* Aliases */
#define ssao_samples_num ssao_params.x
#define jitter_tilling ssao_params.yz
#define dfdy_sign ssao_params.w
#define matcap_hsv matcaps_param[mat_id].matcap_hsv_id.xyz
#define matcap_index matcaps_param[mat_id].matcap_hsv_id.w
#define matcap_rotation matcaps_param[mat_id].matcap_rot.xy
#ifdef USE_FLAT_NORMAL
flat in vec3 normal;
#else
in vec3 normal;
#endif
out vec4 fragColor;
/* TODO Move this to SSAO modules */
/* simple depth reconstruction, see http://www.derschmale.com/2014/01/26/reconstructing-positions-from-the-depth-buffer
* we change the factors from the article to fit the OpennGL model. */
vec3 get_view_space_from_depth(in vec2 uvcoords, in float depth)
{
if (WinMatrix[3][3] == 0.0) {
/* Perspective */
float d = 2.0 * depth - 1.0;
float zview = -WinMatrix[3][2] / (d + WinMatrix[2][2]);
return zview * (viewvecs[0].xyz + vec3(uvcoords, 0.0) * viewvecs[1].xyz);
}
else {
/* Orthographic */
vec3 offset = vec3(uvcoords, depth);
return viewvecs[0].xyz + offset * viewvecs[1].xyz;
}
}
#ifdef USE_HSV
void rgb_to_hsv(vec3 rgb, out vec3 outcol)
{
float cmax, cmin, h, s, v, cdelta;
vec3 c;
cmax = max(rgb[0], max(rgb[1], rgb[2]));
cmin = min(rgb[0], min(rgb[1], rgb[2]));
cdelta = cmax - cmin;
v = cmax;
if (cmax != 0.0)
s = cdelta / cmax;
else {
s = 0.0;
h = 0.0;
}
if (s == 0.0) {
h = 0.0;
}
else {
c = (vec3(cmax, cmax, cmax) - rgb.xyz) / cdelta;
if (rgb.x == cmax) h = c[2] - c[1];
else if (rgb.y == cmax) h = 2.0 + c[0] - c[2];
else h = 4.0 + c[1] - c[0];
h /= 6.0;
if (h < 0.0)
h += 1.0;
}
outcol = vec3(h, s, v);
}
void hsv_to_rgb(vec3 hsv, out vec3 outcol)
{
float i, f, p, q, t, h, s, v;
vec3 rgb;
h = hsv[0];
s = hsv[1];
v = hsv[2];
if (s == 0.0) {
rgb = vec3(v, v, v);
}
else {
if (h == 1.0)
h = 0.0;
h *= 6.0;
i = floor(h);
f = h - i;
rgb = vec3(f, f, f);
p = v * (1.0 - s);
q = v * (1.0 - (s * f));
t = v * (1.0 - (s * (1.0 - f)));
if (i == 0.0) rgb = vec3(v, t, p);
else if (i == 1.0) rgb = vec3(q, v, p);
else if (i == 2.0) rgb = vec3(p, v, t);
else if (i == 3.0) rgb = vec3(p, q, v);
else if (i == 4.0) rgb = vec3(t, p, v);
else rgb = vec3(v, p, q);
}
outcol = rgb;
}
void hue_sat(float hue, float sat, float value, inout vec3 col)
{
vec3 hsv;
rgb_to_hsv(col, hsv);
hsv.x += hue;
hsv.x -= floor(hsv.x);
hsv.y *= sat;
hsv.y = clamp(hsv.y, 0.0, 1.0);
hsv.z *= value;
hsv.z = clamp(hsv.z, 0.0, 1.0);
hsv_to_rgb(hsv, col);
}
#endif
#ifdef USE_AO
/* Prototype */
void ssao_factors(
in float depth, in vec3 normal, in vec3 position, in vec2 screenco,
out float cavities, out float edges);
#endif
void main() {
vec2 screenco = vec2(gl_FragCoord.xy) / screenres;
float depth = texture(depthtex, screenco).r;
vec3 position = get_view_space_from_depth(screenco, depth);
#ifdef USE_ROTATION
/* Rotate texture coordinates */
vec2 rotY = vec2(-matcap_rotation.y, matcap_rotation.x);
vec2 texco = abs(vec2(dot(normal.xy, matcap_rotation), dot(normal.xy, rotY)) * .49 + 0.5);
#else
vec2 texco = abs(normal.xy * .49 + 0.5);
#endif
vec3 col = texture(matcaps, vec3(texco, matcap_index)).rgb;
#ifdef USE_AO
float cavity, edges;
ssao_factors(depth, normal, position, screenco, cavity, edges);
col *= mix(vec3(1.0), matcaps_color[int(matcap_index)], cavity);
#endif
#ifdef USE_HSV
hue_sat(matcap_hsv.x, matcap_hsv.y, matcap_hsv.z, col);
#endif
#ifdef USE_AO
/* Apply highlights after hue shift */
col *= edges + 1.0;
#endif
fragColor = vec4(col, 1.0);
}
|
