#ifndef MSP_GL_TEXTURECUBE_H_
#define MSP_GL_TEXTURECUBE_H_
-#include <msp/gl/extensions/arb_texture_cube_map.h>
#include <msp/graphics/image.h>
-#include "texture.h"
+#include "texturecube_backend.h"
#include "vector.h"
namespace Msp {
enum TextureCubeFace
{
- POSITIVE_X = GL_TEXTURE_CUBE_MAP_POSITIVE_X,
- NEGATIVE_X = GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
- POSITIVE_Y = GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
- NEGATIVE_Y = GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
- POSITIVE_Z = GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
- NEGATIVE_Z = GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
+ POSITIVE_X = 0,
+ NEGATIVE_X = 1,
+ POSITIVE_Y = 2,
+ NEGATIVE_Y = 3,
+ POSITIVE_Z = 4,
+ NEGATIVE_Z = 5
};
/**
-Cube map texture, consisting of six square faces. All of the faces must be of
-the same size. A cube map texture is addressed by three-dimensional texture
-coordinates, with a principal range of [-1, 1]. The face is first selected
-according to the largest coordinate, and the remaining two coordinates are used
-to sample the face image. The images are oriented so that the cross product of
-the s and t axes will point into the cube.
+Cube map texture, consisting of six square faces.
-All faces of a cube map texture must be allocated for it to be usable.
-
-Requires OpenGL version 1.3.
+A cube map texture is addressed by three-dimensional texture coordinates. The
+coordinate vector is projected on the unit cube, with the largest coordinate
+selecting the face and the remaining two used to sample from the face image.
+The images are oriented so that the cross product of the s and t axes will
+point into the cube.
*/
-class TextureCube: public Texture
+class TextureCube: public TextureCubeBackend
{
+ friend TextureCubeBackend;
+
public:
class Loader: public Msp::DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>
{
};
private:
- unsigned size;
- unsigned levels;
- /* Lowest six bits track allocation status of faces on the base level. Bit
- seven is set if the entire base level is allocated. */
- unsigned allocated;
+ unsigned size = 0;
- static TextureCubeFace face_order[6];
- static Vector3 directions[6];
- static unsigned orientations[12];
+ static const Vector3 directions[6];
+ static const unsigned orientations[12];
public:
- TextureCube();
-
- /** Defines storage structure for the texture. If lv is zero, the number
- of mipmap levels is automatically determined from storage dimensions.
-
- Must be called before an image can be uploaded. Once storage is defined,
- it can't be changed. */
- void storage(PixelFormat fmt, unsigned size, unsigned lv = 0);
-
- DEPRECATED void storage(PixelComponents c, unsigned s, unsigned l = 0)
- { storage(make_pixelformat(c, UNSIGNED_BYTE), s, l); }
-
- /** Allocates storage for the cube faces. The contents are initially
- undefined. If storage has already been allocated, does nothing. */
- void allocate(unsigned level);
+ /** Sets storage format and dimensions and allocates memory for the texture.
+ If lv is zero, a complete mipmap pyramid is automatically created. Storage
+ cannot be changed once set. */
+ void storage(PixelFormat, unsigned size, unsigned lv = 0);
- /** Updates the contents of a face. Storage must be defined beforehand.
- The image data must have dimensions and format matching the defined
- storage. */
- void image(TextureCubeFace face, unsigned level, const void *data);
+ virtual void image(unsigned, const void *);
- DEPRECATED void image(TextureCubeFace face, unsigned level,
- PixelComponents comp, DataType type, const void *data);
+ /** Replaces contents of a single face. Allocated storage must exist. The
+ image data is interpreted according to the storage format and must have size
+ matching the selected mipmap level. */
+ void image(TextureCubeFace, unsigned level, const void *);
- /** Updates a rectangular region of a face. Storage must be defined
- beforehand. The image data must be in a format mathing the defined storage
- and the update region must be fully inside the face. */
- void sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned w, unsigned h, const void *data);
-
- DEPRECATED void sub_image(TextureCubeFace face, unsigned level,
- int x, int y, unsigned w, unsigned h,
- PixelComponents comp, DataType type, const void *data);
+ /** Replaces a rectangular region of a face. Allocated storage must exist.
+ The image data is interpreted according to the storage format and the region
+ must be fully inside the face. */
+ void sub_image(TextureCubeFace, unsigned level, unsigned x, unsigned y, unsigned w, unsigned h, const void *);
void image(TextureCubeFace, const Graphics::Image &);
- DEPRECATED void image(TextureCubeFace, const Graphics::Image &, bool);
-
+ /** Sets the texture's contents from an image. The image is treated as a
+ stack of square layers and its height must be six times its width. If
+ storage has not been allocated yet, it will be set to match the image.
+ Otherwise the image must be compatible with the existing storage. */
virtual void image(const Graphics::Image &, unsigned = 0);
- using Texture::image;
unsigned get_size() const { return size; }
private:
- unsigned get_n_levels() const;
unsigned get_level_size(unsigned) const;
public:
- /** Translates indices into face constants. Valid indices are between 0
- and 5, inclusive. */
- static TextureCubeFace enumerate_faces(unsigned);
-
- static unsigned get_face_index(TextureCubeFace);
-
/** Returns a vector pointing out of the face. */
static const Vector3 &get_face_direction(TextureCubeFace);
/** Returns a vector in the direction of the t axis of the face. */
static const Vector3 &get_t_direction(TextureCubeFace);
- /** Returns a vector pointing to the center a texel. */
+ /** Returns a vector pointing to the center of a texel. */
Vector3 get_texel_direction(TextureCubeFace, unsigned, unsigned);
-
- virtual AsyncLoader *load(IO::Seekable &, const Resources * = 0) { return 0; }
- virtual UInt64 get_data_size() const;
- virtual void unload() { }
};
void operator>>(const LexicalConverter &, TextureCubeFace &);
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