X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Ftexture3d_backend.cpp;h=961dd7e721766596f439312c45d11348e4eaebc7;hb=5cbd8664a7300d0c0076862572adeda9955b1c97;hp=6826993ae6d9c37c414d5e6ff5aa50f1c9b7ff09;hpb=160e9eea29bd10034733d59507fa1bcca36be401;p=libs%2Fgl.git

diff --git a/source/backends/opengl/texture3d_backend.cpp b/source/backends/opengl/texture3d_backend.cpp
index 6826993a..961dd7e7 100644
--- a/source/backends/opengl/texture3d_backend.cpp
+++ b/source/backends/opengl/texture3d_backend.cpp
@@ -26,6 +26,9 @@ void OpenGLTexture3D::allocate()
 	unsigned depth = static_cast<const Texture3D *>(this)->depth;
 	unsigned levels = static_cast<const Texture3D *>(this)->levels;
 
+	if(!id)
+		create();
+
 	GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
 	if(ARB_texture_storage)
 	{
@@ -71,5 +74,22 @@ bool OpenGLTexture3D::is_array() const
 	return target==GL_TEXTURE_2D_ARRAY;
 }
 
+size_t OpenGLTexture3D::get_data_size() const
+{
+	if(!id)
+		return 0;
+
+	unsigned width = static_cast<const Texture3D *>(this)->width;
+	unsigned height = static_cast<const Texture3D *>(this)->height;
+	unsigned depth = static_cast<const Texture3D *>(this)->depth;
+	unsigned levels = static_cast<const Texture3D *>(this)->levels;
+
+	size_t level_size = width*height*depth*get_pixel_size(format);
+	size_t total_size = level_size;
+	for(unsigned i=0; i<levels; ++i, level_size>>=2)
+		total_size += level_size;
+	return total_size;
+}
+
 } // namespace GL
 } // namespace Msp