Don't assume vertex arrays start from the beginning of the buffer

[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 bd754fde1091eb42b67fe6787ed2713b421d0f09..b8424872b37c3ee960801bfda52eddd4f4185611 100644 (file)
--- a/source/backends/opengl/texture1d_backend.cpp
+++ b/source/backends/opengl/texture1d_backend.cpp
@@ -20,7 +20,7 @@ void OpenGLTexture1D::allocate()
        unsigned levels = static_cast<const Texture1D *>(this)->levels;
 
        if(!id)
-               generate_id();
+               create();
 
        GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
        if(ARB_texture_storage)
@@ -62,5 +62,20 @@ 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;
+       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
 } // namespace Msp