← Back to branch summary

~ubuntu-branches/ubuntu/trusty/blender/trusty-proposed

« back to all changes in this revision

Viewing changes to intern/cycles/render/filter.cpp

  • Committer: Package Import Robot
  • Author(s): Matteo F. Vescovi
  • Date: 2013-08-14 10:43:49 UTC
  • mfrom: (14.2.19 sid)
  • Revision ID: package-import@ubuntu.com-20130814104349-t1d5mtwkphp12dyj
Tags: 2.68a-3
* Upload to unstable
* debian/: python3.3 Depends simplified
  - debian/control: python3.3 Depends dropped
    for blender-data package
  - 0001-blender_thumbnailer.patch refreshed
* debian/control: libavcodec b-dep versioning dropped

Show diffs side-by-side

added added

removed removed

Lines of Context:
intern/cycles/render/filter.cpp
1
 
/*
2
 
 * Copyright 2011, Blender Foundation.
3
 
 *
4
 
 * This program is free software; you can redistribute it and/or
5
 
 * modify it under the terms of the GNU General Public License
6
 
 * as published by the Free Software Foundation; either version 2
7
 
 * of the License, or (at your option) any later version.
8
 
 *
9
 
 * This program is distributed in the hope that it will be useful,
10
 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
 
 * GNU General Public License for more details.
13
 
 *
14
 
 * You should have received a copy of the GNU General Public License
15
 
 * along with this program; if not, write to the Free Software Foundation,
16
 
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17
 
 */
18
 
 
19
 
#include "camera.h"
20
 
#include "device.h"
21
 
#include "filter.h"
22
 
#include "scene.h"
23
 
 
24
 
#include "kernel_types.h"
25
 
 
26
 
#include "util_algorithm.h"
27
 
#include "util_debug.h"
28
 
#include "util_math.h"
29
 
 
30
 
CCL_NAMESPACE_BEGIN
31
 
 
32
 
Filter::Filter()
33
 
{
34
 
        filter_type = FILTER_BOX;
35
 
        filter_width = 1.0f;
36
 
        need_update = true;
37
 
}
38
 
 
39
 
Filter::~Filter()
40
 
{
41
 
}
42
 
 
43
 
static float filter_func_box(float v, float width)
44
 
{
45
 
        return (float)1;
46
 
}
47
 
 
48
 
static float filter_func_gaussian(float v, float width)
49
 
{
50
 
        v *= (float)2/width;
51
 
        return (float)expf((float)-2*v*v);
52
 
}
53
 
 
54
 
static vector<float> filter_table(FilterType type, float width)
55
 
{
56
 
        const int filter_table_size = FILTER_TABLE_SIZE-1;
57
 
        vector<float> filter_table_cdf(filter_table_size+1);
58
 
        vector<float> filter_table(filter_table_size+1);
59
 
        float (*filter_func)(float, float) = NULL;
60
 
        int i, half_size = filter_table_size/2;
61
 
 
62
 
        switch(type) {
63
 
                case FILTER_BOX:
64
 
                        filter_func = filter_func_box;
65
 
                        break;
66
 
                case FILTER_GAUSSIAN:
67
 
                        filter_func = filter_func_gaussian;
68
 
                        break;
69
 
                default:
70
 
                        assert(0);
71
 
        }
72
 
 
73
 
        /* compute cumulative distribution function */
74
 
        filter_table_cdf[0] = 0.0f;
75
 
        
76
 
        for(i = 0; i < filter_table_size; i++) {
77
 
                float x = i*width*0.5f/(filter_table_size-1);
78
 
                float y = filter_func(x, width);
79
 
                filter_table_cdf[i+1] += filter_table_cdf[i] + fabsf(y);
80
 
        }
81
 
 
82
 
        for(i = 0; i <= filter_table_size; i++)
83
 
                filter_table_cdf[i] /= filter_table_cdf[filter_table_size];
84
 
        
85
 
        /* create importance sampling table */
86
 
        for(i = 0; i <= half_size; i++) {
87
 
                float x = i/(float)half_size;
88
 
                int index = upper_bound(filter_table_cdf.begin(), filter_table_cdf.end(), x) - filter_table_cdf.begin();
89
 
                float t;
90
 
 
91
 
                if(index < filter_table_size+1) {
92
 
                        t = (x - filter_table_cdf[index])/(filter_table_cdf[index+1] - filter_table_cdf[index]);
93
 
                }
94
 
                else {
95
 
                        t = 0.0f;
96
 
                        index = filter_table_size;
97
 
                }
98
 
 
99
 
                float y = ((index + t)/(filter_table_size))*width;
100
 
 
101
 
                filter_table[half_size+i] = 0.5f*(1.0f + y);
102
 
                filter_table[half_size-i] = 0.5f*(1.0f - y);
103
 
        }
104
 
 
105
 
        return filter_table;
106
 
}
107
 
 
108
 
void Filter::device_update(Device *device, DeviceScene *dscene)
109
 
{
110
 
        if(!need_update)
111
 
                return;
112
 
 
113
 
        device_free(device, dscene);
114
 
 
115
 
        /* update __filter_table */
116
 
        vector<float> table = filter_table(filter_type, filter_width);
117
 
 
118
 
        dscene->filter_table.copy(&table[0], table.size());
119
 
        device->tex_alloc("__filter_table", dscene->filter_table, true);
120
 
 
121
 
        need_update = false;
122
 
}
123
 
 
124
 
void Filter::device_free(Device *device, DeviceScene *dscene)
125
 
{
126
 
        device->tex_free(dscene->filter_table);
127
 
        dscene->filter_table.clear();
128
 
}
129
 
 
130
 
bool Filter::modified(const Filter& filter)
131
 
{
132
 
        return !(filter_type == filter.filter_type &&
133
 
                filter_width == filter.filter_width);
134
 
}
135
 
 
136
 
void Filter::tag_update(Scene *scene)
137
 
{
138
 
        need_update = true;
139
 
}
140
 
 
141
 
CCL_NAMESPACE_END
142