diff --git a/Cargo.toml b/Cargo.toml
index 3491bdb..2208ff1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,6 @@ utilities = { git = "https://gavania.de/hodasemi/utilities.git" }
 paste = "1.0.11"
 assetpath = { git = "https://gavania.de/hodasemi/vulkan_lib.git" }
 anyhow = { version = "1.0.68", features = ["backtrace"] }
-safer-ffi = { version = "0.0.10", features= ["proc_macros"] }
 
 # optional
 audio = { git = "https://gavania.de/hodasemi/audio.git", optional = true }
diff --git a/src/guihandler/gui/colorable.rs b/src/guihandler/gui/colorable.rs
index c6254c2..3692777 100644
--- a/src/guihandler/gui/colorable.rs
+++ b/src/guihandler/gui/colorable.rs
@@ -2,7 +2,7 @@
 
 use crate::prelude::*;
 use anyhow::Result;
-use utilities::prelude::*;
+use utilities::{impl_reprc, prelude::*};
 use vulkan_rs::prelude::*;
 
 use cgmath::{vec4, Vector4};
@@ -166,12 +166,13 @@ impl Colorable {
     }
 }
 
-#[derive_ReprC]
-#[repr(C)]
-#[derive(Debug, Clone, Copy)]
-pub struct ColorableVertex {
-    pub position: Vector4<f32>,
-}
+impl_reprc!(
+    #[derive(Debug)]
+    pub struct ColorableVertex {
+        #[assume_reprc]
+        position: Vector4<f32>,
+    }
+);
 
 impl VertexInputDescription for ColorableVertex {
     fn bindings() -> Vec<VkVertexInputBindingDescription> {
diff --git a/src/guihandler/gui/texturedvertex.rs b/src/guihandler/gui/texturedvertex.rs
index c9c308b..3b452bc 100644
--- a/src/guihandler/gui/texturedvertex.rs
+++ b/src/guihandler/gui/texturedvertex.rs
@@ -1,15 +1,16 @@
-use safer_ffi::derive_ReprC;
+use utilities::impl_reprc;
 use vulkan_rs::prelude::*;
 
 use std::mem;
 
-#[derive_ReprC]
-#[repr(C)]
-#[derive(Copy, Clone, Debug)]
-pub struct TexturedVertex {
-    pub position: cgmath::Vector4<f32>,
-    pub texture_coordinates: cgmath::Vector2<f32>,
-}
+impl_reprc!(
+    pub struct TexturedVertex {
+        #[assume_reprc]
+        position: cgmath::Vector4<f32>,
+        #[assume_reprc]
+        texture_coordinates: cgmath::Vector2<f32>,
+    }
+);
 
 impl VertexInputDescription for TexturedVertex {
     fn bindings() -> Vec<VkVertexInputBindingDescription> {
diff --git a/src/guihandler/guihandler.rs b/src/guihandler/guihandler.rs
index 21994ab..8ecc7ca 100644
--- a/src/guihandler/guihandler.rs
+++ b/src/guihandler/guihandler.rs
@@ -2,7 +2,7 @@ use crate::prelude::*;
 use anyhow::Result;
 use assetpath::AssetPath;
 use serde::{Deserialize, Serialize};
-use utilities::prelude::*;
+use utilities::{impl_reprc, prelude::*};
 use vulkan_rs::{prelude::*, render_target::sub_pass::InputAttachmentInfo};
 
 use super::{
@@ -90,11 +90,18 @@ struct DisplayableTexture {
     _texture: Arc<Image>,
 }
 
+impl_reprc!(
+    struct ColorBuffer {
+        #[assume_reprc]
+        color: f32,
+    }
+);
+
 struct TextableColor {
     _descriptor_pool: Arc<DescriptorPool>,
     _descriptor_set: Arc<DescriptorSet>,
 
-    _buffer: Arc<Buffer<f32>>,
+    _buffer: Arc<Buffer<ColorBuffer>>,
 }
 
 struct CommandBufferState {
@@ -546,11 +553,19 @@ impl GuiHandler {
             let desc_set = DescriptorPool::prepare_set(&desc_pool).allocate()?;
 
             let color_array: [f32; 3] = color.into();
+            let color_buffer_array: [ColorBuffer; 3] = color_array
+                .into_iter()
+                .map(|f| ColorBuffer { color: f })
+                .collect::<Vec<ColorBuffer>>()
+                .try_into()
+                .unwrap_or_else(|_: Vec<ColorBuffer>| {
+                    unreachable!("create array from vec from an array")
+                });
 
             let buffer = Buffer::builder()
                 .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
                 .set_memory_usage(MemoryUsage::CpuOnly)
-                .set_data(&color_array)
+                .set_data(&color_buffer_array)
                 .build(self.device.clone())?;
 
             desc_set.update(&[DescriptorWrite::uniform_buffers(0, &[&buffer])])?;