1 #ifndef MSP_GL_TEXTURECUBE_H_
2 #define MSP_GL_TEXTURECUBE_H_
4 #include <msp/gl/extensions/arb_texture_cube_map.h>
5 #include <msp/graphics/image.h>
14 POSITIVE_X = GL_TEXTURE_CUBE_MAP_POSITIVE_X,
15 NEGATIVE_X = GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
16 POSITIVE_Y = GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
17 NEGATIVE_Y = GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
18 POSITIVE_Z = GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
19 NEGATIVE_Z = GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
23 Cube map texture, consisting of six square faces. All of the faces must be of
24 the same size. A cube map texture is addressed by three-dimensional texture
25 coordinates, with a principal range of [-1, 1]. The face is first selected
26 according to the largest coordinate, and the remaining two coordinates are used
27 to sample the face image. The images are oriented so that the cross product of
28 the s and t axes will point into the cube.
30 All faces of a cube map texture must be allocated for it to be usable.
32 Requires OpenGL version 1.3.
34 class TextureCube: public Texture
37 class Loader: public Msp::DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>
40 Loader(TextureCube &);
41 Loader(TextureCube &, Collection &);
45 void external_image(TextureCubeFace, const std::string &);
46 void image_data(TextureCubeFace, const std::string &);
47 void raw_data(TextureCubeFace, const std::string &);
48 void storage(PixelFormat, unsigned);
49 void storage_levels(PixelFormat, unsigned, unsigned);
55 /* Lowest six bits track allocation status of faces on the base level. Bit
56 seven is set if the entire base level is allocated. */
59 static TextureCubeFace face_order[6];
60 static Vector3 directions[6];
61 static unsigned orientations[12];
66 /** Defines storage structure for the texture. If lv is zero, the number
67 of mipmap levels is automatically determined from storage dimensions.
69 Must be called before an image can be uploaded. Once storage is defined,
70 it can't be changed. */
71 void storage(PixelFormat fmt, unsigned size, unsigned lv = 0);
73 DEPRECATED void storage(PixelComponents c, unsigned s, unsigned l = 0)
74 { storage(make_pixelformat(c, UNSIGNED_BYTE), s, l); }
76 /** Allocates storage for the cube faces. The contents are initially
77 undefined. If storage has already been allocated, does nothing. */
78 void allocate(unsigned level);
81 void allocate_(unsigned);
84 /** Updates the contents of a face. Storage must be defined beforehand.
85 The image data must have dimensions and format matching the defined
87 void image(TextureCubeFace face, unsigned level, const void *data);
90 void image_(TextureCubeFace, unsigned, const void *);
93 DEPRECATED void image(TextureCubeFace face, unsigned level,
94 PixelComponents comp, DataType type, const void *data);
96 /** Updates a rectangular region of a face. Storage must be defined
97 beforehand. The image data must be in a format mathing the defined storage
98 and the update region must be fully inside the face. */
99 void sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned w, unsigned h, const void *data);
101 DEPRECATED void sub_image(TextureCubeFace face, unsigned level,
102 int x, int y, unsigned w, unsigned h,
103 PixelComponents comp, DataType type, const void *data);
105 void image(TextureCubeFace, const Graphics::Image &);
107 DEPRECATED void image(TextureCubeFace, const Graphics::Image &, bool);
109 virtual void image(const Graphics::Image &, unsigned = 0);
110 using Texture::image;
112 unsigned get_size() const { return size; }
114 unsigned get_n_levels() const;
115 unsigned get_level_size(unsigned) const;
118 /** Translates indices into face constants. Valid indices are between 0
120 static TextureCubeFace enumerate_faces(unsigned);
122 static unsigned get_face_index(TextureCubeFace);
124 /** Returns a vector pointing out of the face. */
125 static const Vector3 &get_face_direction(TextureCubeFace);
127 /** Returns a vector in the direction of the s axis of the face. */
128 static const Vector3 &get_s_direction(TextureCubeFace);
130 /** Returns a vector in the direction of the t axis of the face. */
131 static const Vector3 &get_t_direction(TextureCubeFace);
133 /** Returns a vector pointing to the center a texel. */
134 Vector3 get_texel_direction(TextureCubeFace, unsigned, unsigned);
136 virtual AsyncLoader *load(IO::Seekable &, const Resources * = 0) { return 0; }
137 virtual UInt64 get_data_size() const;
138 virtual void unload() { }
141 void operator>>(const LexicalConverter &, TextureCubeFace &);