X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Fbackends%2Fopengl%2Ftexture3d_backend.cpp;h=961dd7e721766596f439312c45d11348e4eaebc7;hb=8a8cce8ef4ee28b3572a72958b8b407759f9f826;hp=d2c1088e293964b10deb45874f083063146aea88;hpb=4965ad140daacd10e77b74ce9b49e98c4c4dae55;p=libs%2Fgl.git

diff --git a/source/backends/opengl/texture3d_backend.cpp b/source/backends/opengl/texture3d_backend.cpp
index d2c1088e..961dd7e7 100644
--- a/source/backends/opengl/texture3d_backend.cpp
+++ b/source/backends/opengl/texture3d_backend.cpp
@@ -74,5 +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