X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Ftexture1d_backend.cpp;h=aa9e1f298f9f5a9a407ccc9b24262762bf86ac8f;hb=HEAD;hp=e44ceb4e757d6efefc4b54414d396894d8a9f019;hpb=160e9eea29bd10034733d59507fa1bcca36be401;p=libs%2Fgl.git

diff --git a/source/backends/opengl/texture1d_backend.cpp b/source/backends/opengl/texture1d_backend.cpp
index e44ceb4e..aa9e1f29 100644
--- a/source/backends/opengl/texture1d_backend.cpp
+++ b/source/backends/opengl/texture1d_backend.cpp
@@ -16,29 +16,31 @@ OpenGLTexture1D::OpenGLTexture1D():
 
 void OpenGLTexture1D::allocate()
 {
-	unsigned width = static_cast<const Texture1D *>(this)->width;
-	unsigned levels = static_cast<const Texture1D *>(this)->levels;
+	const Texture1D &self = *static_cast<const Texture1D *>(this);
+
+	if(!id)
+		create();
 
 	GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
 	if(ARB_texture_storage)
 	{
 		if(ARB_direct_state_access)
-			glTextureStorage1D(id, levels, gl_fmt, width);
+			glTextureStorage1D(id, n_levels, gl_fmt, self.width);
 		else
 		{
 			bind_scratch();
-			glTexStorage1D(target, levels, gl_fmt, width);
+			glTexStorage1D(target, n_levels, gl_fmt, self.width);
 		}
 	}
 	else
 	{
 		bind_scratch();
-		glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
+		glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, n_levels-1);
 		GLenum comp = get_gl_components(get_components(storage_fmt));
 		GLenum type = get_gl_type(get_component_type(storage_fmt));
-		for(unsigned i=0; i<levels; ++i)
+		for(unsigned i=0; i<n_levels; ++i)
 		{
-			unsigned lv_size = static_cast<const Texture1D *>(this)->get_level_size(i);
+			unsigned lv_size = self.get_level_size(i);
 			glTexImage1D(target, i, gl_fmt, lv_size, 0, comp, type, 0);
 		}
 	}
@@ -59,5 +61,19 @@ void OpenGLTexture1D::sub_image(unsigned level, int x, unsigned wd, const void *
 	}
 }
 
+size_t OpenGLTexture1D::get_data_size() const
+{
+	if(!id)
+		return 0;
+
+	const Texture1D &self = *static_cast<const Texture1D *>(this);
+
+	size_t level_size = self.width*get_pixel_size(storage_fmt);
+	size_t total_size = level_size;
+	for(unsigned i=0; i<n_levels; ++i, level_size>>=2)
+		total_size += level_size;
+	return total_size;
+}
+
 } // namespace GL
 } // namespace Msp