]> git.tdb.fi Git - libs/gl.git/blob - source/texturecube.cpp
Deprecate the mipmap_levels parameter in Texture
[libs/gl.git] / source / texturecube.cpp
1 #include <msp/datafile/collection.h>
2 #include <msp/gl/extensions/arb_texture_cube_map.h>
3 #include <msp/gl/extensions/arb_texture_storage.h>
4 #include <msp/io/memory.h>
5 #include <msp/strings/format.h>
6 #include "bindable.h"
7 #include "error.h"
8 #include "pixelstore.h"
9 #include "texturecube.h"
10
11 using namespace std;
12
13 namespace Msp {
14 namespace GL {
15
16 TextureCubeFace TextureCube::face_order[6] =
17 {
18         POSITIVE_X,
19         NEGATIVE_X,
20         POSITIVE_Y,
21         NEGATIVE_Y,
22         POSITIVE_Z,
23         NEGATIVE_Z
24 };
25
26 Vector3 TextureCube::directions[6] =
27 {
28         Vector3(1, 0, 0),
29         Vector3(-1, 0, 0),
30         Vector3(0, 1, 0),
31         Vector3(0, -1, 0),
32         Vector3(0, 0, 1),
33         Vector3(0, 0, -1)
34 };
35
36 unsigned TextureCube::orientations[12] =
37 {
38         5, 3,
39         4, 3,
40         0, 4,
41         0, 5,
42         0, 3,
43         1, 3
44 };
45
46 TextureCube::TextureCube():
47         Texture(GL_TEXTURE_CUBE_MAP),
48         size(0),
49         allocated(0)
50 {
51         static Require _req(ARB_texture_cube_map);
52 }
53
54 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
55 {
56         if(size>0)
57                 throw invalid_operation("TextureCube::storage");
58         if(sz==0)
59                 throw invalid_argument("TextureCube::storage");
60
61         set_internal_format(fmt);
62         size = sz;
63         levels = get_n_levels();
64         if(lv>0)
65                 levels = min(levels, lv);
66 }
67
68 void TextureCube::allocate(unsigned level)
69 {
70         if(size==0)
71                 throw invalid_operation("TextureCube::allocate");
72         if(level>=levels)
73                 throw invalid_argument("TextureCube::allocate");
74         if(allocated&(1<<level))
75                 return;
76
77         if(ARB_texture_storage)
78         {
79                 BindRestore _bind(this);
80                 glTexStorage2D(target, levels, ifmt, size, size);
81                 allocated |= (1<<levels)-1;
82         }
83         else
84         {
85                 PixelFormat base_fmt = get_base_pixelformat(ifmt);
86                 DataType type = get_alloc_type(base_fmt);
87                 for(unsigned i=0; i<6; ++i)
88                         image(enumerate_faces(i), level, base_fmt, type, 0);
89         }
90 }
91
92 void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, DataType type, const void *data)
93 {
94         if(size==0)
95                 throw invalid_operation("TextureCube::image");
96
97         unsigned s = get_level_size(level);
98         if(s==0)
99                 throw out_of_range("TextureCube::image");
100
101         if(ARB_texture_storage)
102                 return sub_image(face, level, 0, 0, s, s, fmt, type, data);
103
104         BindRestore _bind(this);
105
106         if(!allocated)
107                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
108         glTexImage2D(face, level, ifmt, s, s, 0, get_upload_format(fmt), type, data);
109
110         // XXX Allocation should be tracked per-face, but we'll run out of bits
111         allocated |= 1<<level;
112         if(auto_gen_mipmap && level==0)
113         {
114                 // TODO Only do this once all faces are created
115                 generate_mipmap();
116                 allocated |= (1<<levels)-1;
117         }
118 }
119
120 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelFormat fmt, DataType type, const void *data)
121 {
122         if(size==0)
123                 throw invalid_operation("TextureCube::sub_image");
124
125         BindRestore _bind(this);
126         allocate(level);
127
128         glTexSubImage2D(face, level, x, y, wd, ht, get_upload_format(fmt), type, data);
129
130         if(auto_gen_mipmap && level==0)
131                 generate_mipmap();
132 }
133
134 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
135 {
136         unsigned w = img.get_width();
137         unsigned h = img.get_height();
138         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
139         if(size==0)
140         {
141                 if(w!=h)
142                         throw incompatible_data("TextureCube::image");
143
144                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
145         }
146         else if(w!=size || h!=size)
147                 throw incompatible_data("TextureCube::image");
148
149         PixelStore pstore = PixelStore::from_image(img);
150         BindRestore _bind_ps(pstore);
151
152         image(face, 0, fmt, UNSIGNED_BYTE, img.get_data());
153 }
154
155 void TextureCube::image(const Graphics::Image &img, unsigned lv, bool srgb)
156 {
157         unsigned w = img.get_width();
158         unsigned h = img.get_height();
159
160         if(h!=w*6)
161                 throw incompatible_data("TextureCube::image");
162         h /= 6;
163
164         PixelFormat fmt = pixelformat_from_graphics(img.get_format());
165         if(size==0)
166         {
167                 unsigned l = (is_mipmapped(min_filter) ? lv : 1);
168                 storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, l);
169         }
170         else if(w!=size || h!=size)
171                 throw incompatible_data("TextureCube::image");
172
173         PixelStore pstore = PixelStore::from_image(img);
174         BindRestore _bind_ps(pstore);
175
176         const char *cdata = reinterpret_cast<const char *>(img.get_data());
177         unsigned face_size = img.get_stride()*size;
178         for(unsigned i=0; i<6; ++i)
179                 image(enumerate_faces(i), 0, fmt, UNSIGNED_BYTE, cdata+i*face_size);
180 }
181
182 unsigned TextureCube::get_n_levels() const
183 {
184         unsigned n = 0;
185         for(unsigned s=size; s; s>>=1, ++n) ;
186         return n;
187 }
188
189 unsigned TextureCube::get_level_size(unsigned level) const
190 {
191         return size>>level;
192 }
193
194 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
195 {
196         if(i>=6)
197                 throw out_of_range("TextureCube::enumerate_faces");
198         return face_order[i];
199 }
200
201 unsigned TextureCube::get_face_index(TextureCubeFace face)
202 {
203         switch(face)
204         {
205         case POSITIVE_X: return 0;
206         case NEGATIVE_X: return 1;
207         case POSITIVE_Y: return 2;
208         case NEGATIVE_Y: return 3;
209         case POSITIVE_Z: return 4;
210         case NEGATIVE_Z: return 5;
211         default: throw invalid_argument("TextureCube::get_face_index");
212         }
213 }
214
215 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
216 {
217         return directions[get_face_index(face)];
218 }
219
220 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
221 {
222         return directions[orientations[get_face_index(face)*2]];
223 }
224
225 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
226 {
227         return directions[orientations[get_face_index(face)*2+1]];
228 }
229
230 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
231 {
232         float s = (u+0.5f)*2.0f/size-1.0f;
233         float t = (v+0.5f)*2.0f/size-1.0f;
234         const Vector3 &fv = get_face_direction(face);
235         const Vector3 &sv = get_s_direction(face);
236         const Vector3 &tv = get_t_direction(face);
237         return fv+s*sv+t*tv;
238 }
239
240 UInt64 TextureCube::get_data_size() const
241 {
242         return id ? size*size*6*get_pixel_size(ifmt) : 0;
243 }
244
245
246 TextureCube::Loader::Loader(TextureCube &t):
247         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
248 {
249         init();
250 }
251
252 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
253         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
254 {
255         init();
256 }
257
258 void TextureCube::Loader::init()
259 {
260         add("external_image", &Loader::external_image);
261         add("image_data", &Loader::image_data);
262         add("raw_data", &Loader::raw_data);
263         add("storage", &Loader::storage);
264 }
265
266 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
267 {
268         Graphics::Image img;
269         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
270         img.load_io(*io);
271
272         obj.image(face, img, srgb);
273 }
274
275 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
276 {
277         Graphics::Image img;
278         IO::Memory mem(data.data(), data.size());
279         img.load_io(mem);
280
281         obj.image(face, img, srgb);
282 }
283
284 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
285 {
286         obj.image(face, 0, get_base_pixelformat(obj.ifmt), UNSIGNED_BYTE, data.data());
287 }
288
289 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
290 {
291         obj.storage(fmt, s);
292 }
293
294
295 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
296 {
297         const string &str = conv.get();
298         if(str=="POSITIVE_X")
299                 face = POSITIVE_X;
300         else if(str=="NEGATIVE_X")
301                 face = NEGATIVE_X;
302         else if(str=="POSITIVE_Y")
303                 face = POSITIVE_Y;
304         else if(str=="NEGATIVE_Y")
305                 face = NEGATIVE_Y;
306         else if(str=="POSITIVE_Z")
307                 face = POSITIVE_Z;
308         else if(str=="NEGATIVE_Z")
309                 face = NEGATIVE_Z;
310         else
311                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
312 }
313
314 } // namespace GL
315 } // namespace Msp