diff options
Diffstat (limited to 'engine/src/mesh')
| -rw-r--r-- | engine/src/mesh/cube.rs | 990 | ||||
| -rw-r--r-- | engine/src/mesh/vertex_buffer.rs | 247 |
2 files changed, 612 insertions, 625 deletions
diff --git a/engine/src/mesh/cube.rs b/engine/src/mesh/cube.rs index 7cdf885..dba6473 100644 --- a/engine/src/mesh/cube.rs +++ b/engine/src/mesh/cube.rs @@ -1,8 +1,15 @@ +use std::collections::HashMap; + +use crate::builder; +use crate::data_types::dimens::Dimens3; use crate::math::calc_triangle_surface_normal; -use crate::mesh::Mesh; -use crate::util::builder; -use crate::vector::Vec3; -use crate::vertex::{Builder as VertexBuilder, Vertex}; +use crate::mesh::vertex_buffer::{ + NamedVertexAttr, + VertexAttrInfo, + VertexBuffer as MeshVertexBuffer, +}; +use crate::mesh::{Mesh, POSITION_VERTEX_ATTRIB_NAME, VertexAttrType}; +use crate::vector::{Vec2, Vec3}; builder! { /// Cube mesh creation specification. @@ -27,676 +34,409 @@ impl CreationSpec } } -#[derive(Debug)] -pub enum Side +impl CreationSpecBuilder { - Front, - Back, - Left, - Right, - Top, - Bottom, + pub fn dimens(mut self, dimens: Dimens3<f32>) -> Self + { + self.width = dimens.width; + self.height = dimens.height; + self.depth = dimens.depth; + + self + } } -#[derive(Debug)] -pub enum Corner +/// Describes what location on a side of a cube a face is. +#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)] +pub enum FaceLocation { - TopRight, - TopLeft, - BottomRight, - BottomLeft, + /// 🮝 + RightUp, + + /// 🮟 + LeftDown, } /// Creates a cube mesh. -pub fn create( - creation_spec: CreationSpec, - vertex_builder_cb: impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) -> Mesh +/// +/// By default, the texture coordinates are arranged so that the full texture is visible +/// on every side. This can be changed inside of the `face_cb` function. +pub fn create(creation_spec: CreationSpec) -> Mesh { - let mut vertices = [const { None }; VertexIndex::VARIANT_CNT]; - - create_front(&creation_spec, &mut vertices, &vertex_builder_cb); - create_back(&creation_spec, &mut vertices, &vertex_builder_cb); - create_right(&creation_spec, &mut vertices, &vertex_builder_cb); - create_left(&creation_spec, &mut vertices, &vertex_builder_cb); - create_top(&creation_spec, &mut vertices, &vertex_builder_cb); - create_bottom(&creation_spec, &mut vertices, &vertex_builder_cb); - - Mesh::new( - vertices.map(Option::unwrap).to_vec(), - Some( - VERTEX_INDICES - .into_iter() - .flatten() - .map(|index| index as u32) - .collect(), - ), - ) -} + // TODO: Reimplement this mess -macro_rules! one { - ($tt: tt) => { - 1 - }; -} + let mut data = Data::default(); -macro_rules! enum_with_variant_cnt { - ( - $(#[$attr: meta])* - enum $name: ident { - $($variant: ident,)* - } - ) => { - $(#[$attr])* - enum $name { - $($variant,)* - } + create_side(&SidePositions::new_top(&creation_spec), &mut data); + create_side(&SidePositions::new_bottom(&creation_spec), &mut data); + create_side(&SidePositions::new_left(&creation_spec), &mut data); + create_side(&SidePositions::new_right(&creation_spec), &mut data); + create_side(&SidePositions::new_back(&creation_spec), &mut data); + create_side(&SidePositions::new_front(&creation_spec), &mut data); - impl $name { - const VARIANT_CNT: usize = 0 $(+ one!($variant))*; - } - }; + data.into_mesh() } -enum_with_variant_cnt! { -#[repr(u32)] -enum VertexIndex +#[derive(Debug, Default)] +struct Data { - FrontTopRight, - FrontBottomRight, - FrontBottomLeft, - FrontTopLeft, - - BackTopRight, - BackBottomRight, - BackBottomLeft, - BackTopLeft, - - RightBackTop, - RightBackBottom, - RightFrontTop, - RightFrontBottom, - - LeftBackTop, - LeftBackBottom, - LeftFrontTop, - LeftFrontBottom, - - TopBackRight, - TopBackLeft, - TopFrontRight, - TopFrontLeft, - - BottomBackRight, - BottomBackLeft, - BottomFrontRight, - BottomFrontLeft, -} + faces: Vec<Face>, + vertex_data: VertexData, } -fn create_front( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +#[derive(Debug, Default)] +struct VertexData { - let front_top_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; - - let front_bottom_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; - - let front_bottom_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; - - let front_top_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; - - let front_normal = calc_triangle_surface_normal( - &front_top_right_pos, - &front_bottom_right_pos, - &front_top_left_pos, - ); - - vertices[VertexIndex::FrontTopRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(front_top_right_pos) - .normal(front_normal), - Side::Front, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::FrontBottomRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(front_bottom_right_pos) - .normal(front_normal), - Side::Front, - Corner::BottomRight, - ) - .build(), - ); - - vertices[VertexIndex::FrontBottomLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(front_bottom_left_pos) - .normal(front_normal), - Side::Front, - Corner::BottomLeft, - ) - .build(), - ); - - vertices[VertexIndex::FrontTopLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(front_top_left_pos) - .normal(front_normal), - Side::Front, - Corner::TopLeft, - ) - .build(), - ); + vertex_positions: Vec<Vec3<f32>>, + vertex_normals: Vec<Vec3<f32>>, } -fn create_back( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +impl Data { - let back_top_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; - - let back_bottom_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: creation_spec.depth / 2.0, - }; - - let back_bottom_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: creation_spec.depth / 2.0, - }; - - let back_top_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; + fn into_mesh(self) -> Mesh + { + let mut vertex_buf = MeshVertexBuffer::with_capacity( + &[ + VertexAttrInfo { + name: POSITION_VERTEX_ATTRIB_NAME.into(), + ty: VertexAttrType::Float32Array { length: 3 }, + }, + VertexAttrInfo { + name: "texture_coords".into(), + ty: VertexAttrType::Float32Array { length: 2 }, + }, + VertexAttrInfo { + name: "normal".into(), + ty: VertexAttrType::Float32Array { length: 3 }, + }, + ], + self.faces.len() * 3, + ); + + let mut indices = Vec::<u32>::with_capacity(self.faces.len() * 3); + + let mut added_face_vertices = HashMap::<FaceVertex, u32>::new(); + + let mut face_location = FaceLocation::RightUp; + + let Self { faces, vertex_data } = self; + + for face in faces { + let face_texture_coords = match face_location { + FaceLocation::RightUp => [ + Vec2 { x: 1.0, y: 1.0 }, + Vec2 { x: 0.0, y: 1.0 }, + Vec2 { x: 1.0, y: 0.0 }, + ], + FaceLocation::LeftDown => [ + Vec2 { x: 0.0, y: 1.0 }, + Vec2 { x: 0.0, y: 0.0 }, + Vec2 { x: 1.0, y: 0.0 }, + ], + }; + + for (face_vertex, vertex_uv) in face.vertices.iter().zip(face_texture_coords) + { + if let Some(vertex_index) = added_face_vertices.get(face_vertex) { + indices.push(*vertex_index); + continue; + } + + let vertex_pos = vertex_data + .vertex_positions + .get(face_vertex.pos_index as usize) + .expect("Vertex position index is out of bounds") + .clone(); + + let vertex_normal = vertex_data + .vertex_normals + .get(face_vertex.normal_index as usize) + .expect("Vertex normal index is out of bounds") + .clone(); + + vertex_buf.push(( + NamedVertexAttr { + name: POSITION_VERTEX_ATTRIB_NAME, + value: vertex_pos.into_array(), + }, + NamedVertexAttr { + name: "texture_coords", + value: vertex_uv.into_array(), + }, + NamedVertexAttr { + name: "normal", + value: vertex_normal.into_array(), + }, + )); + + let vertex_index = u32::try_from(vertex_buf.len() - 1) + .expect("Vertex index does not fit into 32-bit unsigned int"); + + indices.push(vertex_index); + + added_face_vertices.insert(face_vertex.clone(), vertex_index); + } + + match face_location { + FaceLocation::RightUp => face_location = FaceLocation::LeftDown, + FaceLocation::LeftDown => face_location = FaceLocation::RightUp, + } + } - let back_normal = -calc_triangle_surface_normal( - &back_top_right_pos, - &back_bottom_right_pos, - &back_top_left_pos, - ); - - vertices[VertexIndex::BackTopRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(back_top_right_pos) - .normal(back_normal), - Side::Back, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::BackBottomRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(back_bottom_right_pos) - .normal(back_normal), - Side::Back, - Corner::BottomRight, - ) - .build(), - ); - - vertices[VertexIndex::BackBottomLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(back_bottom_left_pos) - .normal(back_normal), - Side::Back, - Corner::BottomLeft, - ) - .build(), - ); - - vertices[VertexIndex::BackTopLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(back_top_left_pos) - .normal(back_normal), - Side::Back, - Corner::TopLeft, - ) - .build(), - ); + Mesh::builder() + .vertices(vertex_buf) + .indices(indices) + .build() + } } -fn create_right( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +#[derive(Debug)] +struct Face { - let right_back_top_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; - - let right_back_bottom_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: creation_spec.depth / 2.0, - }; - - let right_front_top_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; + vertices: [FaceVertex; 3], +} - let right_front_bottom_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; +#[derive(Debug, PartialEq, Eq, Hash, Clone)] +struct FaceVertex +{ + pos_index: u32, + normal_index: u32, +} - let right_normal = calc_triangle_surface_normal( - &right_back_top_pos, - &right_back_bottom_pos, - &right_front_top_pos, - ); - - vertices[VertexIndex::RightBackTop as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(right_back_top_pos) - .normal(right_normal), - Side::Right, - Corner::TopLeft, - ) - .build(), - ); - - vertices[VertexIndex::RightBackBottom as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(right_back_bottom_pos) - .normal(right_normal), - Side::Right, - Corner::BottomLeft, - ) - .build(), - ); - - vertices[VertexIndex::RightFrontTop as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(right_front_top_pos) - .normal(right_normal), - Side::Right, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::RightFrontBottom as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(right_front_bottom_pos) - .normal(right_normal), - Side::Right, - Corner::BottomRight, - ) - .build(), - ); +#[derive(Debug)] +struct SidePositions +{ + up_left: Vec3<f32>, + up_right: Vec3<f32>, + down_left: Vec3<f32>, + down_right: Vec3<f32>, + normal_calc_order: NormalCalcOrder, } -fn create_left( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +impl SidePositions { - let left_back_top_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; + fn new_top(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: -(creation_spec.width / 2.0), + y: creation_spec.height / 2.0, + z: creation_spec.depth / 2.0, + }; + + let down_right = Vec3 { + x: creation_spec.width / 2.0, + y: creation_spec.height / 2.0, + z: -(creation_spec.depth / 2.0), + }; + + Self { + up_left, + up_right: Vec3 { x: down_right.x, ..up_left.clone() }, + down_left: Vec3 { x: up_left.x, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::Clockwise, + } + } - let left_back_bottom_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: creation_spec.depth / 2.0, - }; + fn new_bottom(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: -(creation_spec.width / 2.0), + y: -creation_spec.height / 2.0, + z: creation_spec.depth / 2.0, + }; + + let down_right = Vec3 { + x: creation_spec.width / 2.0, + y: -creation_spec.height / 2.0, + z: -(creation_spec.depth / 2.0), + }; + + Self { + up_left, + up_right: Vec3 { x: down_right.x, ..up_left.clone() }, + down_left: Vec3 { x: up_left.x, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::CounterClockwise, + } + } - let left_front_top_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; + fn new_left(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: -(creation_spec.width / 2.0), + y: creation_spec.height / 2.0, + z: -(creation_spec.depth / 2.0), + }; + + let down_right = Vec3 { + x: -(creation_spec.width / 2.0), + y: -(creation_spec.height / 2.0), + z: creation_spec.depth / 2.0, + }; + + Self { + up_left, + up_right: Vec3 { z: down_right.z, ..up_left.clone() }, + down_left: Vec3 { z: up_left.z, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::CounterClockwise, + } + } - let left_front_bottom_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; + fn new_right(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: (creation_spec.width / 2.0), + y: creation_spec.height / 2.0, + z: -(creation_spec.depth / 2.0), + }; + + let down_right = Vec3 { + x: (creation_spec.width / 2.0), + y: -(creation_spec.height / 2.0), + z: creation_spec.depth / 2.0, + }; + + Self { + up_left, + up_right: Vec3 { z: down_right.z, ..up_left.clone() }, + down_left: Vec3 { z: up_left.z, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::Clockwise, + } + } + + fn new_back(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: -(creation_spec.width / 2.0), + y: creation_spec.height / 2.0, + z: -creation_spec.depth / 2.0, + }; + + let down_right = Vec3 { + x: creation_spec.width / 2.0, + y: -(creation_spec.height / 2.0), + z: -creation_spec.depth / 2.0, + }; + + Self { + up_left, + up_right: Vec3 { x: down_right.x, ..up_left.clone() }, + down_left: Vec3 { x: up_left.x, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::Clockwise, + } + } - let left_normal = -calc_triangle_surface_normal( - &left_back_top_pos, - &left_back_bottom_pos, - &left_front_top_pos, - ); - - vertices[VertexIndex::LeftBackTop as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(left_back_top_pos) - .normal(left_normal), - Side::Left, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::LeftBackBottom as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(left_back_bottom_pos) - .normal(left_normal), - Side::Left, - Corner::BottomRight, - ) - .build(), - ); - - vertices[VertexIndex::LeftFrontTop as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(left_front_top_pos) - .normal(left_normal), - Side::Left, - Corner::TopLeft, - ) - .build(), - ); - - vertices[VertexIndex::LeftFrontBottom as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(left_front_bottom_pos) - .normal(left_normal), - Side::Left, - Corner::BottomLeft, - ) - .build(), - ); + fn new_front(creation_spec: &CreationSpec) -> Self + { + let up_left = Vec3 { + x: -(creation_spec.width / 2.0), + y: creation_spec.height / 2.0, + z: creation_spec.depth / 2.0, + }; + + let down_right = Vec3 { + x: creation_spec.width / 2.0, + y: -(creation_spec.height / 2.0), + z: creation_spec.depth / 2.0, + }; + + Self { + up_left, + up_right: Vec3 { x: down_right.x, ..up_left.clone() }, + down_left: Vec3 { x: up_left.x, ..down_right.clone() }, + down_right, + normal_calc_order: NormalCalcOrder::CounterClockwise, + } + } } -fn create_top( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +#[derive(Debug)] +enum NormalCalcOrder { - let top_back_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; - - let top_back_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: creation_spec.depth / 2.0, - }; - - let top_front_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; - - let top_front_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: creation_spec.height / 2.0, - z: -(creation_spec.depth / 2.0), - }; - - let top_normal = -calc_triangle_surface_normal( - &top_back_right_pos, - &top_back_left_pos, - &top_front_right_pos, - ); - - vertices[VertexIndex::TopBackRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(top_back_right_pos) - .normal(top_normal), - Side::Top, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::TopBackLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(top_back_left_pos) - .normal(top_normal), - Side::Top, - Corner::TopLeft, - ) - .build(), - ); - - vertices[VertexIndex::TopFrontLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(top_front_left_pos) - .normal(top_normal), - Side::Top, - Corner::BottomLeft, - ) - .build(), - ); - - vertices[VertexIndex::TopFrontRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(top_front_right_pos) - .normal(top_normal), - Side::Top, - Corner::BottomRight, - ) - .build(), - ); + Clockwise, + CounterClockwise, } -fn create_bottom( - creation_spec: &CreationSpec, - vertices: &mut [Option<Vertex>], - vertex_builder_cb: &impl Fn(VertexBuilder, Side, Corner) -> VertexBuilder, -) +fn create_side(side_positions: &SidePositions, data: &mut Data) { - let bottom_back_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: (creation_spec.depth / 2.0), + let normal = match side_positions.normal_calc_order { + NormalCalcOrder::Clockwise => calc_triangle_surface_normal( + &side_positions.up_left, + &side_positions.up_right, + &side_positions.down_left, + ), + NormalCalcOrder::CounterClockwise => calc_triangle_surface_normal( + &side_positions.up_left, + &side_positions.down_left, + &side_positions.up_right, + ), }; - let bottom_back_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: creation_spec.depth / 2.0, - }; + data.vertex_data.vertex_normals.push(normal); - let bottom_front_right_pos = Vec3 { - x: creation_spec.width / 2.0, - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; + let top_normal_index = data.vertex_data.vertex_normals.len() - 1; - let bottom_front_left_pos = Vec3 { - x: -(creation_spec.width / 2.0), - y: -(creation_spec.height / 2.0), - z: -(creation_spec.depth / 2.0), - }; + data.vertex_data + .vertex_positions + .push(side_positions.up_right); - let bottom_normal = calc_triangle_surface_normal( - &bottom_back_right_pos, - &bottom_back_left_pos, - &bottom_front_right_pos, - ); - - vertices[VertexIndex::BottomBackRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(bottom_back_right_pos) - .normal(bottom_normal), - Side::Bottom, - Corner::BottomRight, - ) - .build(), - ); - - vertices[VertexIndex::BottomBackLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(bottom_back_left_pos) - .normal(bottom_normal), - Side::Bottom, - Corner::BottomLeft, - ) - .build(), - ); - - vertices[VertexIndex::BottomFrontRight as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(bottom_front_right_pos) - .normal(bottom_normal), - Side::Bottom, - Corner::TopRight, - ) - .build(), - ); - - vertices[VertexIndex::BottomFrontLeft as usize] = Some( - vertex_builder_cb( - VertexBuilder::default() - .pos(bottom_front_left_pos) - .normal(bottom_normal), - Side::Bottom, - Corner::TopLeft, - ) - .build(), - ); -} + let up_right_pos_index = data.vertex_data.vertex_positions.len() - 1; -const VERTEX_INDICES_FRONT: [VertexIndex; 6] = [ - // 🮝 - VertexIndex::FrontTopRight, - VertexIndex::FrontBottomRight, - VertexIndex::FrontTopLeft, - // - // 🮟 - VertexIndex::FrontBottomRight, - VertexIndex::FrontBottomLeft, - VertexIndex::FrontTopLeft, -]; + data.vertex_data + .vertex_positions + .push(side_positions.up_left); -const VERTEX_INDICES_BACK: [VertexIndex; 6] = [ - // 🮝 - VertexIndex::BackTopRight, - VertexIndex::BackBottomRight, - VertexIndex::BackTopLeft, - // - // 🮟 - VertexIndex::BackBottomRight, - VertexIndex::BackBottomLeft, - VertexIndex::BackTopLeft, -]; + let up_left_pos_index = data.vertex_data.vertex_positions.len() - 1; -const VERTEX_INDICES_RIGHT: [VertexIndex; 6] = [ - // 🮝 - VertexIndex::RightBackTop, - VertexIndex::RightBackBottom, - VertexIndex::RightFrontTop, - // - // 🮟 - VertexIndex::RightBackBottom, - VertexIndex::RightFrontBottom, - VertexIndex::RightFrontTop, -]; + data.vertex_data + .vertex_positions + .push(side_positions.down_left); -const VERTEX_INDICES_LEFT: [VertexIndex; 6] = [ - // 🮝 - VertexIndex::LeftBackTop, - VertexIndex::LeftBackBottom, - VertexIndex::LeftFrontTop, - // - // 🮟 - VertexIndex::LeftBackBottom, - VertexIndex::LeftFrontBottom, - VertexIndex::LeftFrontTop, -]; + let down_left_pos_index = data.vertex_data.vertex_positions.len() - 1; -const VERTEX_INDICES_TOP: [VertexIndex; 6] = [ - // 🮝 - VertexIndex::TopBackRight, - VertexIndex::TopBackLeft, - VertexIndex::TopFrontRight, - // - // 🮟 - VertexIndex::TopBackLeft, - VertexIndex::TopFrontLeft, - VertexIndex::TopFrontRight, -]; + data.vertex_data + .vertex_positions + .push(side_positions.down_right); + + let down_right_pos_index = data.vertex_data.vertex_positions.len() - 1; -const VERTEX_INDICES_BOTTOM: [VertexIndex; 6] = [ // 🮝 - VertexIndex::BottomBackRight, - VertexIndex::BottomBackLeft, - VertexIndex::BottomFrontRight, - // + data.faces.push(Face { + vertices: [ + FaceVertex { + pos_index: up_right_pos_index as u32, + normal_index: top_normal_index as u32, + }, + FaceVertex { + pos_index: up_left_pos_index as u32, + normal_index: top_normal_index as u32, + }, + FaceVertex { + pos_index: down_right_pos_index as u32, + normal_index: top_normal_index as u32, + }, + ], + }); + // 🮟 - VertexIndex::BottomBackLeft, - VertexIndex::BottomFrontLeft, - VertexIndex::BottomFrontRight, -]; - -const VERTEX_INDICES: [[VertexIndex; 6]; 6] = [ - VERTEX_INDICES_FRONT, - VERTEX_INDICES_BACK, - VERTEX_INDICES_RIGHT, - VERTEX_INDICES_LEFT, - VERTEX_INDICES_TOP, - VERTEX_INDICES_BOTTOM, -]; + data.faces.push(Face { + vertices: [ + FaceVertex { + pos_index: up_left_pos_index as u32, + normal_index: top_normal_index as u32, + }, + FaceVertex { + pos_index: down_left_pos_index as u32, + normal_index: top_normal_index as u32, + }, + FaceVertex { + pos_index: down_right_pos_index as u32, + normal_index: top_normal_index as u32, + }, + ], + }); +} diff --git a/engine/src/mesh/vertex_buffer.rs b/engine/src/mesh/vertex_buffer.rs new file mode 100644 index 0000000..3e3c467 --- /dev/null +++ b/engine/src/mesh/vertex_buffer.rs @@ -0,0 +1,247 @@ +use std::alloc::Layout; +use std::borrow::Cow; +use std::marker::PhantomData; + +use seq_macro::seq; +use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout}; + +use crate::mesh::VertexAttrType; + +pub trait VertexAttrValue: + IntoBytes + FromBytes + KnownLayout + Immutable + 'static +{ + fn ty() -> VertexAttrType; +} + +impl VertexAttrValue for f32 +{ + fn ty() -> VertexAttrType + { + VertexAttrType::Float32 + } +} + +impl<const LEN: usize> VertexAttrValue for [f32; LEN] +{ + fn ty() -> VertexAttrType + { + VertexAttrType::Float32Array { length: LEN } + } +} + +#[derive(Debug)] +pub struct NamedVertexAttr<'name, Value: VertexAttrValue> +{ + pub name: &'name str, + pub value: Value, +} + +#[derive(Debug, Clone)] +#[non_exhaustive] +pub struct VertexAttrProperties +{ + pub name: Cow<'static, str>, + pub ty: VertexAttrType, + pub layout: Layout, + pub byte_offset: usize, +} + +#[derive(Debug)] +pub struct VertexAttrInfo +{ + pub name: Cow<'static, str>, + pub ty: VertexAttrType, +} + +#[derive(Debug, Clone, Default)] +pub struct VertexBuffer +{ + buf: Vec<u8>, + vertex_size: usize, + vertex_attr_props: Vec<VertexAttrProperties>, +} + +impl VertexBuffer +{ + pub fn with_capacity(vertex_attrs: &[VertexAttrInfo], capacity: usize) -> Self + { + let mut vertex_attr_props = vertex_attrs + .iter() + .map(|VertexAttrInfo { name, ty }| VertexAttrProperties { + name: name.clone(), + ty: ty.clone(), + layout: ty.layout(), + byte_offset: 0, + }) + .collect::<Vec<_>>(); + + let mut vertex_layout = Layout::new::<()>(); + + for VertexAttrProperties { + name: _, + ty: _, + layout: vertex_attr_layout, + byte_offset: vertex_attr_byte_offset, + } in &mut vertex_attr_props + { + let (new_struct_layout, byte_offset) = + vertex_layout.extend(*vertex_attr_layout).unwrap(); + + *vertex_attr_byte_offset = byte_offset; + vertex_layout = new_struct_layout; + } + + let vertex_layout = vertex_layout.pad_to_align(); + + Self { + buf: Vec::with_capacity(vertex_layout.size() * capacity), + vertex_size: vertex_layout.size(), + vertex_attr_props, + } + } + + pub fn push<'name, VertexAttrs: NamedVertexAttrs<'name>>( + &mut self, + vertex: VertexAttrs, + ) + { + assert_eq!( + self.vertex_attr_props.len(), + vertex.vertex_attr_cnt(), + "Vertex has incorrect amount of attributes" + ); + + if self.buf.spare_capacity_mut().len() < self.vertex_size { + self.buf.reserve_exact(self.vertex_size * (self.len() / 2)); + } + + let spare_capacity = self.buf.spare_capacity_mut(); + + let vertex_attrs = vertex.vertex_attrs(); + + for (vertex_attr_name, vertex_attr_bytes, vertex_attr_ty) in vertex_attrs { + let vertex_attr_props = self + .vertex_attr_props + .iter() + .find(|vertex_attr_props| vertex_attr_props.name == vertex_attr_name) + .unwrap(); + + assert_eq!(vertex_attr_ty, vertex_attr_props.ty); + + let start_offset = vertex_attr_props.byte_offset; + + let end_offset = start_offset + vertex_attr_props.layout.size(); + + spare_capacity[start_offset..end_offset] + .write_copy_of_slice(vertex_attr_bytes); + } + + unsafe { + self.buf.set_len(self.buf.len() + self.vertex_size); + } + } + + pub fn vertex_attr_props(&self) -> &[VertexAttrProperties] + { + &self.vertex_attr_props + } + + pub fn len(&self) -> usize + { + assert_eq!(self.buf.len() % self.vertex_size, 0, "Invalid length"); + + self.buf.len() / self.vertex_size + } + + pub fn vertex_size(&self) -> usize + { + self.vertex_size + } + + pub fn as_bytes(&self) -> &[u8] + { + &self.buf + } + + pub fn iter<VertexAttr: VertexAttrValue>( + &self, + vertex_attr_name: &str, + ) -> Iter<'_, VertexAttr> + { + let vertex_attr_props = self + .vertex_attr_props + .iter() + .find(|vertex_attr_props| vertex_attr_props.name == vertex_attr_name) + .unwrap(); + + assert_eq!(VertexAttr::ty(), vertex_attr_props.ty); + + Iter { + buf: self, + vertex_attr_props, + curr_index: 0, + _pd: PhantomData, + } + } +} + +pub struct Iter<'a, VertexAttr: VertexAttrValue> +{ + buf: &'a VertexBuffer, + vertex_attr_props: &'a VertexAttrProperties, + curr_index: usize, + _pd: PhantomData<VertexAttr>, +} + +impl<'a, VertexAttr: VertexAttrValue> Iterator for Iter<'a, VertexAttr> +{ + type Item = &'a VertexAttr; + + fn next(&mut self) -> Option<Self::Item> + { + let start_offset = + (self.buf.vertex_size * self.curr_index) + self.vertex_attr_props.byte_offset; + + let end_offset = start_offset + self.vertex_attr_props.layout.size(); + + let bytes = self.buf.buf.get(start_offset..end_offset)?; + + self.curr_index += 1; + + Some(VertexAttr::ref_from_bytes(bytes).unwrap()) + } +} + +pub trait NamedVertexAttrs<'name> +{ + fn vertex_attr_cnt(&self) -> usize; + + fn vertex_attrs(&self) -> impl Iterator<Item = (&'name str, &[u8], VertexAttrType)>; +} + +macro_rules! impl_named_vertex_attrs { + ($cnt: tt) => { + seq!(I in 0..$cnt { + impl<'name, #(VertexAttr~I: VertexAttrValue,)*> + NamedVertexAttrs<'name> for (#(NamedVertexAttr<'name, VertexAttr~I>,)*) + { + fn vertex_attr_cnt(&self) -> usize + { + $cnt + } + + fn vertex_attrs(&self) + -> impl Iterator<Item = (&'name str, &[u8], VertexAttrType)> + { + [#( + (self.I.name, self.I.value.as_bytes(), VertexAttr~I::ty()), + )*].into_iter() + } + } + }); + }; +} + +seq!(I in 0..16 { + impl_named_vertex_attrs!(I); +}); |