0.8.2 API documentation
mipmaps_compute.hpp
1 #pragma once
2 
3 #include "filter_compute.hpp"
4 
5 namespace gli{
6 namespace detail
7 {
8  template <typename texture_type, typename sampler_value_type, typename fetch_func, typename write_func, typename normalized_type, typename texel_type>
9  inline void generate_mipmaps_1d
10  (
11  texture_type & Texture, fetch_func Fetch, write_func Write,
12  typename texture_type::size_type BaseLayer, typename texture_type::size_type MaxLayer,
13  typename texture_type::size_type BaseFace, typename texture_type::size_type MaxFace,
14  typename texture_type::size_type BaseLevel, typename texture_type::size_type MaxLevel,
15  filter Min
16  )
17  {
18  typedef typename detail::interpolate<sampler_value_type>::type interpolate_type;
19  typedef typename texture_type::extent_type extent_type;
20  typedef typename texture_type::size_type size_type;
21  typedef typename extent_type::value_type component_type;
22  typedef typename detail::filterBase<detail::DIMENSION_1D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type>::filterFunc filter_func;
23 
24  filter_func const Filter = detail::get_filter<filter_func, detail::DIMENSION_1D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type, sampler_value_type>(FILTER_NEAREST, Min, false);
25  GLI_ASSERT(Filter);
26 
27  for(size_type Layer = BaseLayer; Layer <= MaxLayer; ++Layer)
28  for(size_type Face = BaseFace; Face <= MaxFace; ++Face)
29  for(size_type Level = BaseLevel; Level < MaxLevel; ++Level)
30  {
31  extent_type const& ExtentDst = Texture.extent(Level + 1);
32  normalized_type const& Scale = normalized_type(1) / normalized_type(max(ExtentDst - extent_type(1), extent_type(1)));
33 
34  for(component_type i = 0; i < ExtentDst.x; ++i)
35  {
36  normalized_type const& SamplePosition(normalized_type(static_cast<typename normalized_type::value_type>(i)) * Scale);
37  texel_type const& Texel = Filter(Texture, Fetch, SamplePosition, Layer, Face, static_cast<sampler_value_type>(Level), texel_type(0));
38  Write(Texture, extent_type(i), Layer, Face, Level + 1, Texel);
39  }
40  }
41  }
42 
43  template <typename texture_type, typename sampler_value_type, typename fetch_func, typename write_func, typename normalized_type, typename texel_type>
44  inline void generate_mipmaps_2d
45  (
46  texture_type & Texture, fetch_func Fetch, write_func Write,
47  typename texture_type::size_type BaseLayer, typename texture_type::size_type MaxLayer,
48  typename texture_type::size_type BaseFace, typename texture_type::size_type MaxFace,
49  typename texture_type::size_type BaseLevel, typename texture_type::size_type MaxLevel,
50  filter Min
51  )
52  {
53  typedef typename detail::interpolate<sampler_value_type>::type interpolate_type;
54  typedef typename texture_type::extent_type extent_type;
55  typedef typename texture_type::size_type size_type;
56  typedef typename extent_type::value_type component_type;
57  typedef typename detail::filterBase<detail::DIMENSION_2D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type>::filterFunc filter_func;
58 
59  filter_func const Filter = detail::get_filter<filter_func, detail::DIMENSION_2D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type, sampler_value_type>(FILTER_NEAREST, Min, false);
60  GLI_ASSERT(Filter);
61 
62  for(size_type Layer = BaseLayer; Layer <= MaxLayer; ++Layer)
63  for(size_type Face = BaseFace; Face <= MaxFace; ++Face)
64  for(size_type Level = BaseLevel; Level < MaxLevel; ++Level)
65  {
66  extent_type const& ExtentDst = Texture.extent(Level + 1);
67  normalized_type const& Scale = normalized_type(1) / normalized_type(max(ExtentDst - extent_type(1), extent_type(1)));
68 
69  for(component_type j = 0; j < ExtentDst.y; ++j)
70  for(component_type i = 0; i < ExtentDst.x; ++i)
71  {
72  normalized_type const& SamplePosition(normalized_type(i, j) * Scale);
73  texel_type const& Texel = Filter(Texture, Fetch, SamplePosition, Layer, Face, static_cast<sampler_value_type>(Level), texel_type(0));
74  Write(Texture, extent_type(i, j), Layer, Face, Level + 1, Texel);
75  }
76  }
77  }
78 
79  template <typename texture_type, typename sampler_value_type, typename fetch_func, typename write_func, typename normalized_type, typename texel_type>
80  inline void generate_mipmaps_3d
81  (
82  texture_type & Texture, fetch_func Fetch, write_func Write,
83  typename texture_type::size_type BaseLayer, typename texture_type::size_type MaxLayer,
84  typename texture_type::size_type BaseFace, typename texture_type::size_type MaxFace,
85  typename texture_type::size_type BaseLevel, typename texture_type::size_type MaxLevel,
86  filter Min
87  )
88  {
89  typedef typename detail::interpolate<sampler_value_type>::type interpolate_type;
90  typedef typename texture_type::extent_type extent_type;
91  typedef typename texture_type::size_type size_type;
92  typedef typename extent_type::value_type component_type;
93  typedef typename detail::filterBase<detail::DIMENSION_3D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type>::filterFunc filter_func;
94 
95  filter_func const Filter = detail::get_filter<filter_func, detail::DIMENSION_3D, texture_type, interpolate_type, normalized_type, fetch_func, texel_type, sampler_value_type>(FILTER_NEAREST, Min, false);
96  GLI_ASSERT(Filter);
97 
98  for(size_type Layer = BaseLayer; Layer <= MaxLayer; ++Layer)
99  for(size_type Face = BaseFace; Face <= MaxFace; ++Face)
100  for(size_type Level = BaseLevel; Level < MaxLevel; ++Level)
101  {
102  extent_type const& ExtentDst = Texture.extent(Level + 1);
103  normalized_type const& Scale = normalized_type(1) / normalized_type(max(ExtentDst - extent_type(1), extent_type(1)));
104 
105  for(component_type k = 0; k < ExtentDst.z; ++k)
106  for(component_type j = 0; j < ExtentDst.y; ++j)
107  for(component_type i = 0; i < ExtentDst.x; ++i)
108  {
109  normalized_type const& SamplePosition(normalized_type(i, j, k) * Scale);
110  texel_type const& Texel = Filter(Texture, Fetch, SamplePosition, Layer, Face, static_cast<sampler_value_type>(Level), texel_type(0));
111  Write(Texture, extent_type(i, j, k), Layer, Face, Level + 1, Texel);
112  }
113  }
114  }
115 }//namespace detail
116 }//namespace gli
gli::filter
filter
Texture filtring modes.
Definition: filter.hpp:9
gli
Namespace where all the classes and functions provided by GLI are exposed.
Definition: clear.hpp:6
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