+
+ struct Texture2D {
+ GLint internal_format;
+ GLsizei width, height;
+ };
+
+ // A mapping from texture number to format details. This is filled if the
+ // texture is given out to a client or on the freelist, but not if it is
+ // deleted from the freelist.
+ std::map<GLuint, Texture2D> texture_formats;
+
+ // A list of all textures that are release but not freed (most recently freed
+ // first), and an estimate of their current memory usage. Once
+ // <texture_freelist_bytes> goes above <texture_freelist_max_bytes>,
+ // elements are deleted off the end of the list until we are under the limit
+ // again.
+ std::list<GLuint> texture_freelist;
+ size_t texture_freelist_bytes;
+
+ static const unsigned num_fbo_attachments = 4;
+ struct FBO {
+ GLuint fbo_num;
+ // GL_INVALID_INDEX means associated to a texture that has since been deleted.
+ // 0 means the output isn't bound.
+ GLuint texture_num[num_fbo_attachments];
+ };
+
+ // For each context, a mapping from FBO number to format details. This is
+ // filled if the FBO is given out to a client or on the freelist, but
+ // not if it is deleted from the freelist.
+ std::map<std::pair<void *, GLuint>, FBO> fbo_formats;
+ typedef std::map<std::pair<void *, GLuint>, FBO>::iterator FBOFormatIterator;
+
+ // For each context, a list of all FBOs that are released but not freed
+ // (most recently freed first). Once this reaches <fbo_freelist_max_length>,
+ // the last element will be deleted.
+ //
+ // We store iterators directly into <fbo_format> for efficiency.
+ std::map<void *, std::list<FBOFormatIterator> > fbo_freelist;
+
+ // See the caveats at the constructor.
+ static size_t estimate_texture_size(const Texture2D &texture_format);