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
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <cstdint>
#include "BLI_array.hh"
#include "BLI_hash.hh"
#include "BLI_index_range.hh"
#include "BLI_math_base.hh"
#include "RE_pipeline.h"
#include "GPU_shader.h"
#include "GPU_texture.h"
#include "COM_symmetric_separable_blur_weights.hh"
namespace blender::realtime_compositor {
/* --------------------------------------------------------------------
* Symmetric Separable Blur Weights Key.
*/
SymmetricSeparableBlurWeightsKey::SymmetricSeparableBlurWeightsKey(int type, float radius)
: type(type), radius(radius)
{
}
uint64_t SymmetricSeparableBlurWeightsKey::hash() const
{
return get_default_hash_2(type, radius);
}
bool operator==(const SymmetricSeparableBlurWeightsKey &a,
const SymmetricSeparableBlurWeightsKey &b)
{
return a.type == b.type && a.radius == b.radius;
}
/* --------------------------------------------------------------------
* Symmetric Separable Blur Weights.
*/
SymmetricSeparableBlurWeights::SymmetricSeparableBlurWeights(int type, float radius)
{
/* The size of filter is double the radius plus 1, but since the filter is symmetric, we only
* compute half of it and no doubling happens. We add 1 to make sure the filter size is always
* odd and there is a center weight. */
const int size = math::ceil(radius) + 1;
Array<float> weights(size);
float sum = 0.0f;
/* First, compute the center weight. */
const float center_weight = RE_filter_value(type, 0.0f);
weights[0] = center_weight;
sum += center_weight;
/* Second, compute the other weights in the positive direction, making sure to add double the
* weight to the sum of weights because the filter is symmetric and we only loop over half of
* it. Skip the center weight already computed by dropping the front index. */
const float scale = radius > 0.0f ? 1.0f / radius : 0.0f;
for (const int i : weights.index_range().drop_front(1)) {
const float weight = RE_filter_value(type, i * scale);
weights[i] = weight;
sum += weight * 2.0f;
}
/* Finally, normalize the weights. */
for (const int i : weights.index_range()) {
weights[i] /= sum;
}
texture_ = GPU_texture_create_1d("Weights", size, 1, GPU_R16F, weights.data());
}
SymmetricSeparableBlurWeights::~SymmetricSeparableBlurWeights()
{
GPU_texture_free(texture_);
}
void SymmetricSeparableBlurWeights::bind_as_texture(GPUShader *shader,
const char *texture_name) const
{
const int texture_image_unit = GPU_shader_get_texture_binding(shader, texture_name);
GPU_texture_bind(texture_, texture_image_unit);
}
void SymmetricSeparableBlurWeights::unbind_as_texture() const
{
GPU_texture_unbind(texture_);
}
} // namespace blender::realtime_compositor
|
