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[libs/gl.git] / source / texturecube.cpp
1 #include <msp/gl/extensions/arb_texture_cube_map.h>
2 #include <msp/io/memory.h>
3 #include <msp/strings/format.h>
4 #include "bindable.h"
5 #include "error.h"
6 #include "pixelstore.h"
7 #include "texturecube.h"
8
9 using namespace std;
10
11 namespace Msp {
12 namespace GL {
13
14 Vector3 TextureCube::directions[6] =
15 {
16         Vector3(1, 0, 0),
17         Vector3(-1, 0, 0),
18         Vector3(0, 1, 0),
19         Vector3(0, -1, 0),
20         Vector3(0, 0, 1),
21         Vector3(0, 0, -1)
22 };
23
24 TextureCube::TextureCube():
25         Texture(GL_TEXTURE_CUBE_MAP),
26         ifmt(RGB),
27         size(0),
28         allocated(0)
29 {
30         static Require _req(ARB_texture_cube_map);
31 }
32
33 void TextureCube::storage(PixelFormat fmt, unsigned sz)
34 {
35         if(size>0)
36                 throw invalid_operation("TextureCube::storage");
37         if(sz==0)
38                 throw invalid_argument("TextureCube::storage");
39         require_pixelformat(fmt);
40
41         ifmt = fmt;
42         size = sz;
43 }
44
45 void TextureCube::allocate(unsigned level)
46 {
47         if(allocated&(1<<level))
48                 return;
49
50         for(unsigned i=0; i<6; ++i)
51                 image(enumerate_faces(i), level, get_base_pixelformat(ifmt), UNSIGNED_BYTE, 0);
52 }
53
54 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
55 {
56         if(size==0)
57                 throw invalid_operation("TextureCube::image");
58
59         unsigned s = get_level_size(level);
60         if(s==0)
61                 throw out_of_range("TextureCube::image");
62
63         BindRestore _bind(this);
64         glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
65
66         // XXX Allocation should be tracked per-face, but we'll run out of bits
67         allocated |= 1<<level;
68         if(gen_mipmap && level==0)
69         {
70                 for(; s; s>>=1, ++level) ;
71                 allocated |= (1<<level)-1;
72         }
73 }
74
75 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
76 {
77         unsigned w = img.get_width();
78         unsigned h = img.get_height();
79         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
80         if(size==0)
81         {
82                 if(w!=h)
83                         throw incompatible_data("TextureCube::image");
84
85                 PixelFormat f = storage_pixelformat_from_graphics(img.get_format());
86                 if(srgb)
87                         f = get_srgb_pixelformat(f);
88                 storage(f, w);
89         }
90         else if(w!=size || h!=size)
91                 throw incompatible_data("TextureCube::image");
92
93         PixelStore pstore = PixelStore::from_image(img);
94         BindRestore _bind_ps(pstore);
95
96         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
97 }
98
99 unsigned TextureCube::get_level_size(unsigned level)
100 {
101         return size>>level;
102 }
103
104 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
105 {
106         switch(i)
107         {
108         case 0: return POSITIVE_X;
109         case 1: return NEGATIVE_X;
110         case 2: return POSITIVE_Y;
111         case 3: return NEGATIVE_Y;
112         case 4: return POSITIVE_Z;
113         case 5: return NEGATIVE_Z;
114         default: throw out_of_range("TextureCube::enumerate_faces");
115         }
116 }
117
118 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
119 {
120         switch(face)
121         {
122         case POSITIVE_X: return directions[0];
123         case NEGATIVE_X: return directions[1];
124         case POSITIVE_Y: return directions[2];
125         case NEGATIVE_Y: return directions[3];
126         case POSITIVE_Z: return directions[4];
127         case NEGATIVE_Z: return directions[5];
128         default: throw invalid_argument("TextureCube::get_face_direction");
129         }
130 }
131
132 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
133 {
134         switch(face)
135         {
136         case POSITIVE_X: return directions[5];
137         case NEGATIVE_X: return directions[4];
138         case POSITIVE_Y: return directions[0];
139         case NEGATIVE_Y: return directions[0];
140         case POSITIVE_Z: return directions[0];
141         case NEGATIVE_Z: return directions[1];
142         default: throw invalid_argument("TextureCube::get_s_direction");
143         }
144 }
145
146 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
147 {
148         switch(face)
149         {
150         case POSITIVE_X: return directions[3];
151         case NEGATIVE_X: return directions[3];
152         case POSITIVE_Y: return directions[4];
153         case NEGATIVE_Y: return directions[5];
154         case POSITIVE_Z: return directions[3];
155         case NEGATIVE_Z: return directions[3];
156         default: throw invalid_argument("TextureCube::get_t_direction");
157         }
158 }
159
160 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
161 {
162         float s = (u+0.5f)*2.0f/size-1.0f;
163         float t = (v+0.5f)*2.0f/size-1.0f;
164         const Vector3 &fv = get_face_direction(face);
165         const Vector3 &sv = get_s_direction(face);
166         const Vector3 &tv = get_t_direction(face);
167         return fv+s*sv+t*tv;
168 }
169
170 UInt64 TextureCube::get_data_size() const
171 {
172         return id ? size*size*6*get_pixel_size(ifmt) : 0;
173 }
174
175
176 TextureCube::Loader::Loader(TextureCube &t):
177         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
178 {
179         init();
180 }
181
182 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
183         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
184 {
185         init();
186 }
187
188 void TextureCube::Loader::init()
189 {
190         add("image_data", &Loader::image_data);
191         add("raw_data", &Loader::raw_data);
192         add("storage", &Loader::storage);
193 }
194
195 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
196 {
197         Graphics::Image img;
198         IO::Memory mem(data.data(), data.size());
199         img.load_io(mem);
200
201         obj.image(face, img, srgb);
202 }
203
204 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
205 {
206         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
207 }
208
209 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
210 {
211         if(srgb)
212                 fmt = get_srgb_pixelformat(fmt);
213         obj.storage(fmt, s);
214 }
215
216
217 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
218 {
219         const string &str = conv.get();
220         if(str=="POSITIVE_X")
221                 face = POSITIVE_X;
222         else if(str=="NEGATIVE_X")
223                 face = NEGATIVE_X;
224         else if(str=="POSITIVE_Y")
225                 face = POSITIVE_Y;
226         else if(str=="NEGATIVE_Y")
227                 face = NEGATIVE_Y;
228         else if(str=="POSITIVE_Z")
229                 face = POSITIVE_Z;
230         else if(str=="NEGATIVE_Z")
231                 face = NEGATIVE_Z;
232         else
233                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
234 }
235
236 } // namespace GL
237 } // namespace Msp