Account for mipmap levels when computing texture data sizes

[libs/gl.git] / source / backends / opengl / texture1d_backend.cpp

diff --git a/source/backends/opengl/texture1d_backend.cpp b/source/backends/opengl/texture1d_backend.cpp
index a270468b141883437f46d51de02a54888f69ee6f..b8424872b37c3ee960801bfda52eddd4f4185611 100644 (file)
--- a/source/backends/opengl/texture1d_backend.cpp
+++ b/source/backends/opengl/texture1d_backend.cpp
@@ -64,8 +64,17 @@ void OpenGLTexture1D::sub_image(unsigned level, int x, unsigned wd, const void *
 
 size_t OpenGLTexture1D::get_data_size() const
 {
+       if(!id)
+               return 0;
+
        unsigned width = static_cast<const Texture1D *>(this)->width;
-       return id ? width*get_pixel_size(storage_fmt) : 0;
+       unsigned levels = static_cast<const Texture1D *>(this)->levels;
+
+       size_t level_size = width*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;
 }
 
 } // namespace GL