X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Ftexturecube_backend.cpp;h=1cc3f8377f23eaf3027d8e54caeb58f83dbefd7b;hb=8a8cce8ef4ee28b3572a72958b8b407759f9f826;hp=b113f1bd21ba1a13f01effd610d67df8e7e01624;hpb=160e9eea29bd10034733d59507fa1bcca36be401;p=libs%2Fgl.git

diff --git a/source/backends/opengl/texturecube_backend.cpp b/source/backends/opengl/texturecube_backend.cpp
index b113f1bd..1cc3f837 100644
--- a/source/backends/opengl/texturecube_backend.cpp
+++ b/source/backends/opengl/texturecube_backend.cpp
@@ -31,6 +31,9 @@ void OpenGLTextureCube::allocate()
 	unsigned size = static_cast<const TextureCube *>(this)->size;
 	unsigned levels = static_cast<const TextureCube *>(this)->levels;
 
+	if(!id)
+		create();
+
 	GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
 	if(ARB_texture_storage)
 	{
@@ -72,6 +75,22 @@ void OpenGLTextureCube::sub_image(unsigned face, unsigned level, int x, int y, u
 	}
 }
 
+size_t OpenGLTextureCube::get_data_size() const
+{
+	if(!id)
+		return 0;
+
+	unsigned size = static_cast<const TextureCube *>(this)->size;
+	unsigned levels = static_cast<const TextureCube *>(this)->levels;
+
+	size_t level_size = size*size*get_pixel_size(storage_fmt);
+	size_t total_size = level_size;
+	for(unsigned i=0; i<levels; ++i, level_size>>=2)
+		total_size += level_size;
+	return total_size;
+}
+
+
 unsigned get_gl_cube_face(unsigned face)
 {
 	switch(static_cast<TextureCubeFace>(face))