Account for mipmap levels when computing texture data sizes

[libs/gl.git] / source / backends / opengl / texture2d_backend.cpp

diff --git a/source/backends/opengl/texture2d_backend.cpp b/source/backends/opengl/texture2d_backend.cpp
index 72962117bc9967d98228735063b5189e10368dfd..2f396df4180978ec52821ec59247ed5a76293be4 100644 (file)
--- a/source/backends/opengl/texture2d_backend.cpp
+++ b/source/backends/opengl/texture2d_backend.cpp
@@ -102,9 +102,18 @@ Resource::AsyncLoader *OpenGLTexture2D::load(IO::Seekable &io, const Resources *
 
 uint64_t OpenGLTexture2D::get_data_size() const
 {
+       if(!id)
+               return 0;
+
        unsigned width = static_cast<const Texture2D *>(this)->width;
        unsigned height = static_cast<const Texture2D *>(this)->height;
-       return id ? width*height*get_pixel_size(format) : 0;
+       unsigned levels = static_cast<const Texture2D *>(this)->levels;
+
+       size_t level_size = width*height*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;
 }
 
 void OpenGLTexture2D::unload()