diff --git a/Cargo.toml b/Cargo.toml
index 3c78cd4..26130b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,6 @@ rfactor_sm_reader = { git = "https://gavania.de/hodasemi/rfactor_sm_reader.git"
 ui = { git = "https://gavania.de/hodasemi/ui.git" }
 
 anyhow = { version = "1.0.68", features = ["backtrace"] }
-safer-ffi = { version = "0.0.10", features = ["proc_macros"] }
 paste = "1.0.11"
 serde = "1.0.152"
 serde_json = "1.0.91"
diff --git a/src/overlay/elements/leaderboard/bg_generator.rs b/src/overlay/elements/leaderboard/bg_generator.rs
index c9860d8..b4ffb6c 100644
--- a/src/overlay/elements/leaderboard/bg_generator.rs
+++ b/src/overlay/elements/leaderboard/bg_generator.rs
@@ -7,7 +7,7 @@ use std::{
     time::Duration,
 };
 
-use crate::overlay::elements::PositionOnlyVertex;
+use crate::overlay::elements::{ColorBuffer, PositionOnlyVertex};
 
 pub struct BackgroundGenerator;
 
@@ -107,7 +107,7 @@ impl BackgroundGenerator {
                 let color_buffer = Buffer::builder()
                     .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
                     .set_memory_usage(MemoryUsage::CpuOnly)
-                    .set_data(&color)
+                    .set_data(&ColorBuffer::from_array(color))
                     .build(device.clone())?;
 
                 let desc_pool = DescriptorPool::builder()
diff --git a/src/overlay/elements/mod.rs b/src/overlay/elements/mod.rs
index 4bcc077..32218cd 100644
--- a/src/overlay/elements/mod.rs
+++ b/src/overlay/elements/mod.rs
@@ -6,18 +6,36 @@ mod watermark;
 pub use leaderboard::*;
 pub use pedals::*;
 pub use radar::*;
+use utilities::impl_reprc;
 pub use watermark::*;
 
 use std::mem;
 use vulkan_rs::prelude::*;
 
-#[derive_ReprC]
-#[repr(C)]
-#[derive(Clone)]
-pub struct PositionOnlyVertex {
-    pub position: cgmath::Vector4<f32>,
+impl_reprc!(
+    pub struct ColorBuffer {
+        #[assume_reprc]
+        c: f32,
+    }
+);
+
+impl ColorBuffer {
+    pub fn from_array<const N: usize>(a: [f32; N]) -> [Self; N] {
+        a.into_iter()
+            .map(|c| Self { c })
+            .collect::<Vec<Self>>()
+            .try_into()
+            .unwrap_or_else(|_: Vec<Self>| unreachable!("create array from vec from an array"))
+    }
 }
 
+impl_reprc!(
+    pub struct PositionOnlyVertex {
+        #[assume_reprc]
+        position: cgmath::Vector4<f32>,
+    }
+);
+
 impl PositionOnlyVertex {
     ///
     /// corners[0]  -  bottom left
diff --git a/src/overlay/elements/pedals/mod.rs b/src/overlay/elements/pedals/mod.rs
index 9114ac8..e5916dc 100644
--- a/src/overlay/elements/pedals/mod.rs
+++ b/src/overlay/elements/pedals/mod.rs
@@ -10,6 +10,7 @@ use ui::prelude::*;
 use vulkan_rs::prelude::*;
 
 use crate::overlay::{
+    elements::ColorBuffer,
     rfactor_data::{DataReceiver, GamePhase},
     UiOverlay,
 };
@@ -96,10 +97,10 @@ impl Pedals {
             .set_descriptor_set_count(2)
             .build(device.clone())?;
 
-        let brake_color_buffer: Arc<Buffer<f32>> = Buffer::builder()
+        let brake_color_buffer = Buffer::builder()
             .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
             .set_memory_usage(MemoryUsage::CpuOnly)
-            .set_data(&[0.9, 0.0, 0.0, 1.0])
+            .set_data(&ColorBuffer::from_array([0.9, 0.0, 0.0, 1.0]))
             .build(device.clone())?;
 
         write_log!("allocate brake descriptor");
@@ -107,10 +108,10 @@ impl Pedals {
         let brake_descriptor = descriptor_pool.prepare_set().allocate()?;
         brake_descriptor.update(&[DescriptorWrite::uniform_buffers(0, &[&brake_color_buffer])])?;
 
-        let throttle_color_buffer: Arc<Buffer<f32>> = Buffer::builder()
+        let throttle_color_buffer = Buffer::builder()
             .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
             .set_memory_usage(MemoryUsage::CpuOnly)
-            .set_data(&[0.0, 0.9, 0.0, 1.0])
+            .set_data(&ColorBuffer::from_array([0.0, 0.9, 0.0, 1.0]))
             .build(device.clone())?;
 
         write_log!("allocate throttle descriptor");
diff --git a/src/overlay/elements/radar/mod.rs b/src/overlay/elements/radar/mod.rs
index eb685d2..9a2b3b2 100644
--- a/src/overlay/elements/radar/mod.rs
+++ b/src/overlay/elements/radar/mod.rs
@@ -21,7 +21,7 @@ use crate::{
     write_log,
 };
 
-use super::PositionOnlyVertex;
+use super::{ColorBuffer, PositionOnlyVertex};
 
 fn convert_vec(v: rF2Vec3) -> Vector3<f32> {
     vec3(v.x as f32, v.y as f32, v.z as f32)
@@ -385,7 +385,7 @@ struct RadarObject {
     descriptor_set: Arc<DescriptorSet>,
 
     // uniform buffer
-    color_buffer: Arc<Buffer<f32>>,
+    color_buffer: Arc<Buffer<ColorBuffer>>,
 
     // vertex buffer
     position_buffer: Arc<Buffer<PositionOnlyVertex>>,
@@ -401,7 +401,7 @@ impl RadarObject {
         let color_buffer = Buffer::builder()
             .set_usage(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT)
             .set_memory_usage(MemoryUsage::CpuOnly)
-            .set_data(&color)
+            .set_data(&ColorBuffer::from_array(color))
             .build(device.clone())?;
 
         let position_buffer = Buffer::builder()
@@ -445,7 +445,12 @@ impl RadarObject {
             car_width,
             car_height,
         ))?;
-        self.color_buffer.fill(&color)
+        self.color_buffer.fill(
+            &color
+                .iter()
+                .map(|&c| ColorBuffer { c })
+                .collect::<Vec<ColorBuffer>>(),
+        )
     }
 }