From ec22c4a6e4cd8ba00a90e83346ff33bf23e60a43 Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Mon, 19 Oct 2026 02:08:10 +0300
Subject: [PATCH] remove per-vertex color

---
 src/crown_gear.rs      |  2 --
 src/lib.rs             |  5 +++--
 src/render/mesh.rs     |  9 ++-------
 src/render/mesh.wgsl   | 12 +++++-------
 src/render/mesh/cpu.rs |  8 ++------
 5 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/src/crown_gear.rs b/src/crown_gear.rs
index 66c6ba9..137ec1a 100644
--- a/src/crown_gear.rs
+++ b/src/crown_gear.rs
@@ -24,7 +24,6 @@ pub fn make_mesh_smooth(
 	desc: &CrownGearDesc,
 	visual: &CrownGearVisual,
 	sides: usize,
-	color: Vec3,
 ) -> MeshIndexed {
 	let teeth = 2.0 * desc.pitch_radius;
 	let inner_scale = visual.inner_radius / desc.pitch_radius;
@@ -50,7 +49,6 @@ pub fn make_mesh_smooth(
 
 		let vertex = |x, z, n| Vertex {
 			position: rot * vec3(x, 0.0, z),
-			color,
 			normal: n,
 		};
 		mesh.vertices.extend([
diff --git a/src/lib.rs b/src/lib.rs
index 9a92840..2312f8f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -111,7 +111,7 @@ impl Core {
 			600,
 		)
 		.to_mesh()
-		.to_standard_mesh(vec3(0.5, 0.5, 0.5))
+		.to_standard_mesh()
 		.into_indexed();
 
 		let bevel_gear_desc = bevel_gear::BevelGearDesc {
@@ -128,7 +128,7 @@ impl Core {
 			&bevel_gear::BevelGearShape::new_blank(&bevel_gear_desc, 60),
 		)
 		.to_mesh()
-		.to_standard_mesh(vec3(0.5, 0.5, 0.5))
+		.to_standard_mesh()
 		.into_indexed();
 
 		let mesh_gray = render::mesh::GpuMeshIndexed::new(&device, &bevel_gear_mesh);
@@ -168,6 +168,7 @@ impl Core {
 				mvp: proj * view,
 				light: vec3(0.7, 0.5, 1.0).normalize(),
 				_zero: 0.,
+				color: vec4(0.5, 0.5, 0.5, 1.0),
 			},
 		);
 		self.queue.submit([]); // flush buffer updates
diff --git a/src/render/mesh.rs b/src/render/mesh.rs
index 06e3cdd..28446a8 100644
--- a/src/render/mesh.rs
+++ b/src/render/mesh.rs
@@ -1,7 +1,7 @@
 use std::mem::offset_of;
 
 use bytemuck::{Pod, Zeroable, bytes_of, cast_slice};
-use glam::{Mat4, Vec3};
+use glam::{Mat4, Vec3, Vec4};
 use wgpu::util::DeviceExt;
 
 pub use cpu::*;
@@ -14,7 +14,6 @@ static SHADER: &str = include_str!("mesh.wgsl");
 #[repr(C)]
 pub struct Vertex {
 	pub position: Vec3,
-	pub color: Vec3,
 	pub normal: Vec3,
 }
 
@@ -24,6 +23,7 @@ pub struct Params {
 	pub mvp: Mat4,
 	pub light: Vec3,
 	pub _zero: f32,
+	pub color: Vec4,
 }
 
 pub struct GpuMesh {
@@ -121,11 +121,6 @@ impl Pipeline {
 						},
 						wgpu::VertexAttribute {
 							shader_location: 1,
-							offset: offset_of!(Vertex, color) as u64,
-							format: wgpu::VertexFormat::Float32x3,
-						},
-						wgpu::VertexAttribute {
-							shader_location: 2,
 							offset: offset_of!(Vertex, normal) as u64,
 							format: wgpu::VertexFormat::Float32x3,
 						},
diff --git a/src/render/mesh.wgsl b/src/render/mesh.wgsl
index 14b3acc..35ea427 100644
--- a/src/render/mesh.wgsl
+++ b/src/render/mesh.wgsl
@@ -2,18 +2,17 @@ struct Params {
 	mvp: mat4x4f,
 	light: vec3f,
 	_zero: f32,
+	color: vec4f,
 }
 
 struct Vertex {
 	@location(0) position: vec3f,
-	@location(1) color: vec3f,
-	@location(2) normal: vec3f,
+	@location(1) normal: vec3f,
 }
 
 struct Varying {
 	@builtin(position) screen: vec4f,
-	@location(0) color: vec4f,
-	@location(1) normal: vec3f,
+	@location(0) normal: vec3f,
 }
 
 @group(0) @binding(0) var<uniform> params: Params;
@@ -21,9 +20,8 @@ struct Varying {
 @vertex
 fn on_vertex(in: Vertex) -> Varying {
 	let position = params.mvp * vec4f(in.position, 1.0);
-	let color = vec4f(in.color, 1.0);
 	let normal = in.normal;
-	return Varying(position, color, normal);
+	return Varying(position, normal);
 }
 
 @fragment
@@ -31,6 +29,6 @@ fn on_fragment(in: Varying) -> @location(0) vec4f {
 	let normal = normalize(in.normal);
 	let light = dot(params.light, normal);
 	let u = 0.5 + 0.5 * light;
-	let color = vec4f(u * in.color.xyz, in.color.w);
+	let color = vec4f(u * params.color.xyz, params.color.w);
 	return color;
 }
diff --git a/src/render/mesh/cpu.rs b/src/render/mesh/cpu.rs
index 4d369b6..6ad30c3 100644
--- a/src/render/mesh/cpu.rs
+++ b/src/render/mesh/cpu.rs
@@ -46,7 +46,7 @@ impl<T: Copy> Mesh<T> {
 }
 
 impl Mesh<Vec3> {
-	pub fn to_standard_mesh(&self, color: Vec3) -> CpuMesh {
+	pub fn to_standard_mesh(&self) -> CpuMesh {
 		CpuMesh {
 			faces: self
 				.faces
@@ -54,11 +54,7 @@ impl Mesh<Vec3> {
 				.map(|face| {
 					let [a, b, c] = face;
 					let normal = (b - a).cross(c - a).normalize();
-					face.map(|position| Vertex {
-						position,
-						color,
-						normal,
-					})
+					face.map(|position| Vertex { position, normal })
 				})
 				.collect(),
 		}