]> git.tdb.fi Git - libs/gl.git/blob - source/core/texturecube.cpp
Convert framebuffers and related functionality to new state management
[libs/gl.git] / source / core / texturecube.cpp
1 #include <msp/datafile/collection.h>
2 #include <msp/gl/extensions/arb_direct_state_access.h>
3 #include <msp/gl/extensions/arb_seamless_cube_map.h>
4 #include <msp/gl/extensions/arb_texture_cube_map.h>
5 #include <msp/gl/extensions/arb_texture_storage.h>
6 #include <msp/io/memory.h>
7 #include <msp/strings/format.h>
8 #include "bindable.h"
9 #include "error.h"
10 #include "pixelstore.h"
11 #include "texturecube.h"
12
13 using namespace std;
14
15 namespace Msp {
16 namespace GL {
17
18 TextureCubeFace TextureCube::face_order[6] =
19 {
20         POSITIVE_X,
21         NEGATIVE_X,
22         POSITIVE_Y,
23         NEGATIVE_Y,
24         POSITIVE_Z,
25         NEGATIVE_Z
26 };
27
28 Vector3 TextureCube::directions[6] =
29 {
30         Vector3(1, 0, 0),
31         Vector3(-1, 0, 0),
32         Vector3(0, 1, 0),
33         Vector3(0, -1, 0),
34         Vector3(0, 0, 1),
35         Vector3(0, 0, -1)
36 };
37
38 unsigned TextureCube::orientations[12] =
39 {
40         5, 3,
41         4, 3,
42         0, 4,
43         0, 5,
44         0, 3,
45         1, 3
46 };
47
48 TextureCube::TextureCube():
49         Texture(GL_TEXTURE_CUBE_MAP),
50         size(0),
51         allocated(0)
52 {
53         static Require _req(ARB_texture_cube_map);
54         if(ARB_seamless_cube_map)
55                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
56 }
57
58 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
59 {
60         if(size>0)
61         {
62                 if(fmt!=format || sz!=size || (lv && lv!=levels))
63                         throw incompatible_data("TextureCube::storage");
64                 return;
65         }
66         if(sz==0)
67                 throw invalid_argument("TextureCube::storage");
68
69         set_format(fmt);
70         size = sz;
71         levels = get_n_levels();
72         if(lv>0)
73                 levels = min(levels, lv);
74 }
75
76 void TextureCube::allocate(unsigned level)
77 {
78         if(size==0)
79                 throw invalid_operation("TextureCube::allocate");
80         if(level>=levels)
81                 throw invalid_argument("TextureCube::allocate");
82         if(allocated&(64<<level))
83                 return;
84
85         bool direct = ARB_texture_storage && ARB_direct_state_access;
86         if(!direct)
87         {
88                 glActiveTexture(GL_TEXTURE0);
89                 glBindTexture(target, id);
90         }
91
92         allocate_(level);
93
94         if(!direct)
95                 glBindTexture(target, 0);
96 }
97
98 void TextureCube::allocate_(unsigned level)
99 {
100         if(ARB_texture_storage)
101         {
102                 if(ARB_direct_state_access)
103                         glTextureStorage2D(id, levels, storage_fmt, size, size);
104                 else
105                         glTexStorage2D(target, levels, storage_fmt, size, size);
106                 apply_swizzle();
107                 allocated |= (64<<levels)-1;
108         }
109         else
110         {
111                 for(unsigned i=0; i<6; ++i)
112                         image_(enumerate_faces(i), level, 0);
113         }
114 }
115
116 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
117 {
118         if(size==0)
119                 throw invalid_operation("TextureCube::image");
120         if(level>=levels)
121                 throw out_of_range("TextureCube::image");
122
123         if(ARB_texture_storage)
124         {
125                 unsigned lsz = get_level_size(level);
126                 return sub_image(face, level, 0, 0, lsz, lsz, data);
127         }
128
129         glActiveTexture(GL_TEXTURE0);
130         glBindTexture(target, id);
131
132         image_(face, level, data);
133
134         if(auto_gen_mipmap && level==0 && (allocated&63)==63)
135         {
136                 generate_mipmap_();
137                 allocated |= (64<<levels)-1;
138         }
139
140         glBindTexture(target, 0);
141 }
142
143 void TextureCube::image_(TextureCubeFace face, unsigned level, const void *data)
144 {
145         if(!allocated)
146         {
147                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
148                 apply_swizzle();
149         }
150
151         unsigned lsz = get_level_size(level);
152         PixelComponents comp = get_components(storage_fmt);
153         GLenum type = get_gl_type(get_component_type(storage_fmt));
154         glTexImage2D(face, level, storage_fmt, lsz, lsz, 0, comp, type, data);
155
156         if(level==0)
157         {
158                 allocated |= 1<<get_face_index(face);
159                 if((allocated&63)==63)
160                         allocated |= 64;
161         }
162         else if(!(allocated&(64<<level)))
163         {
164                 for(unsigned i=0; i<6; ++i)
165                         if(enumerate_faces(i)!=face)
166                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, lsz, lsz, 0, comp, type, 0);
167
168                 allocated |= 64<<level;
169         }
170 }
171
172 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
173 {
174         if(comp!=get_components(format) || type!=get_component_type(format))
175                 throw incompatible_data("TextureCube::image");
176         image(face, level, data);
177 }
178
179 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
180 {
181         if(size==0)
182                 throw invalid_operation("TextureCube::sub_image");
183         if(level>=levels)
184                 throw out_of_range("TextureCube::sub_image");
185
186         bool direct = (ARB_direct_state_access && (ARB_texture_storage || (allocated&(1<<level))));
187         if(!direct)
188         {
189                 glActiveTexture(GL_TEXTURE0);
190                 glBindTexture(target, id);
191         }
192
193         allocate_(level);
194
195         PixelComponents comp = get_components(storage_fmt);
196         GLenum type = get_gl_type(get_component_type(storage_fmt));
197         if(ARB_direct_state_access)
198                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
199         else
200                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
201
202         if(auto_gen_mipmap && level==0)
203                 generate_mipmap_();
204
205         if(!direct)
206                 glBindTexture(target, 0);
207 }
208
209 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
210 {
211         if(comp!=get_components(format) || type!=get_component_type(format))
212                 throw incompatible_data("TextureCube::subimage");
213         sub_image(face, level, x, y, wd, ht, data);
214 }
215
216 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
217 {
218         unsigned w = img.get_width();
219         unsigned h = img.get_height();
220         if(w!=h)
221                 throw incompatible_data("TextureCube::image");
222
223         PixelFormat fmt = pixelformat_from_image(img);
224         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
225
226         PixelStore pstore = PixelStore::from_image(img);
227         BindRestore _bind_ps(pstore);
228
229         image(face, 0, img.get_pixels());
230 }
231
232 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
233 {
234         image(face, img);
235 }
236
237 void TextureCube::image(const Graphics::Image &img, unsigned lv)
238 {
239         unsigned w = img.get_width();
240         unsigned h = img.get_height();
241
242         if(h!=w*6)
243                 throw incompatible_data("TextureCube::image");
244         h /= 6;
245
246         PixelFormat fmt = pixelformat_from_image(img);
247         if(size==0)
248                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
249         else if(w!=size || h!=size)
250                 throw incompatible_data("TextureCube::image");
251
252         PixelStore pstore = PixelStore::from_image(img);
253         BindRestore _bind_ps(pstore);
254
255         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
256         unsigned face_size = img.get_stride()*size;
257         for(unsigned i=0; i<6; ++i)
258                 image(enumerate_faces(i), 0, pixels+i*face_size);
259 }
260
261 unsigned TextureCube::get_n_levels() const
262 {
263         unsigned n = 0;
264         for(unsigned s=size; s; s>>=1, ++n) ;
265         return n;
266 }
267
268 unsigned TextureCube::get_level_size(unsigned level) const
269 {
270         return size>>level;
271 }
272
273 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
274 {
275         if(i>=6)
276                 throw out_of_range("TextureCube::enumerate_faces");
277         return face_order[i];
278 }
279
280 unsigned TextureCube::get_face_index(TextureCubeFace face)
281 {
282         switch(face)
283         {
284         case POSITIVE_X: return 0;
285         case NEGATIVE_X: return 1;
286         case POSITIVE_Y: return 2;
287         case NEGATIVE_Y: return 3;
288         case POSITIVE_Z: return 4;
289         case NEGATIVE_Z: return 5;
290         default: throw invalid_argument("TextureCube::get_face_index");
291         }
292 }
293
294 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
295 {
296         return directions[get_face_index(face)];
297 }
298
299 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
300 {
301         return directions[orientations[get_face_index(face)*2]];
302 }
303
304 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
305 {
306         return directions[orientations[get_face_index(face)*2+1]];
307 }
308
309 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
310 {
311         float s = (u+0.5f)*2.0f/size-1.0f;
312         float t = (v+0.5f)*2.0f/size-1.0f;
313         const Vector3 &fv = get_face_direction(face);
314         const Vector3 &sv = get_s_direction(face);
315         const Vector3 &tv = get_t_direction(face);
316         return fv+s*sv+t*tv;
317 }
318
319 UInt64 TextureCube::get_data_size() const
320 {
321         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
322 }
323
324
325 TextureCube::Loader::Loader(TextureCube &t):
326         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
327 {
328         init();
329 }
330
331 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
332         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
333 {
334         init();
335 }
336
337 void TextureCube::Loader::init()
338 {
339         add("external_image", &Loader::external_image);
340         add("image_data", &Loader::image_data);
341         add("raw_data", &Loader::raw_data);
342         add("storage", &Loader::storage);
343         add("storage", &Loader::storage_levels);
344 }
345
346 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
347 {
348         Graphics::Image img;
349         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
350         img.load_io(*io);
351
352         obj.image(face, img);
353 }
354
355 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
356 {
357         Graphics::Image img;
358         IO::Memory mem(data.data(), data.size());
359         img.load_io(mem);
360
361         obj.image(face, img);
362 }
363
364 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
365 {
366         obj.image(face, 0, data.data());
367 }
368
369 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
370 {
371         obj.storage(fmt, s);
372 }
373
374 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
375 {
376         obj.storage(fmt, s, l);
377 }
378
379
380 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
381 {
382         const string &str = conv.get();
383         if(str=="POSITIVE_X")
384                 face = POSITIVE_X;
385         else if(str=="NEGATIVE_X")
386                 face = NEGATIVE_X;
387         else if(str=="POSITIVE_Y")
388                 face = POSITIVE_Y;
389         else if(str=="NEGATIVE_Y")
390                 face = NEGATIVE_Y;
391         else if(str=="POSITIVE_Z")
392                 face = POSITIVE_Z;
393         else if(str=="NEGATIVE_Z")
394                 face = NEGATIVE_Z;
395         else
396                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
397 }
398
399 } // namespace GL
400 } // namespace Msp