From 665a83d1742844170f0c810c6bd296d4933da357 Mon Sep 17 00:00:00 2001 From: Quaternions Date: Thu, 28 Sep 2023 15:43:10 -0700 Subject: [PATCH] primitives generates IndexedModel --- src/model.rs | 12 ++-- src/primitives.rs | 136 ++++++++++++++++++++++++++++------------------ 2 files changed, 88 insertions(+), 60 deletions(-) diff --git a/src/model.rs b/src/model.rs index 21320724..67363266 100644 --- a/src/model.rs +++ b/src/model.rs @@ -3,14 +3,14 @@ use bytemuck::{Pod, Zeroable}; #[repr(C)] pub struct Vertex { pub pos: [f32; 3], - pub texture: [f32; 2], + pub tex: [f32; 2], pub normal: [f32; 3], pub color: [f32; 4], } -#[derive(Hash)] +#[derive(Hash,PartialEq,Eq)] pub struct IndexedVertex{ pub pos:u32, - pub texture:u32, + pub tex:u32, pub normal:u32, pub color:u32, } @@ -23,7 +23,7 @@ pub struct IndexedGroup{ } pub struct IndexedModel{ pub unique_pos:Vec<[f32; 3]>, - pub unique_texture:Vec<[f32; 2]>, + pub unique_tex:Vec<[f32; 2]>, pub unique_normal:Vec<[f32; 3]>, pub unique_color:Vec<[f32; 4]>, pub unique_vertices:Vec, @@ -59,7 +59,7 @@ pub fn generate_indexed_model_from_obj(data:obj::ObjData,color:[f32;4]) -> Vec Vec crate::model::ModelData{ - generate_partial_unit_cube([Some(FaceDescription::default());6],None) +pub fn the_unit_cube_lol() -> crate::model::IndexedModel{ + generate_partial_unit_cube([Some(FaceDescription::default());6]) } +#[derive(Copy,Clone)] pub struct FaceDescription{ - transform:glam::Affine2, - color:glam::Vec4, + pub texture:Option, + pub transform:glam::Affine2, + pub color:glam::Vec4, } impl std::default::Default for FaceDescription{ fn default() -> Self { Self{ + texture:None, transform:glam::Affine2::IDENTITY, color:glam::Vec4::ONE, } } } impl FaceDescription{ - pub fn new(transform:glam::Affine2,color:glam::Vec4)->Self{ - Self{transform,color} + pub fn new(texture:u32,transform:glam::Affine2,color:glam::Vec4)->Self{ + Self{texture:Some(texture),transform,color} + } + pub fn from_texture(texture:u32)->Self{ + Self{ + texture:Some(texture), + transform:glam::Affine2::IDENTITY, + color:glam::Vec4::ONE, + } } } -pub fn generate_partial_unit_cube(face_transforms:[Option;6],texture:Option) -> crate::model::ModelData{ //generate transformed vertices - let mut generated_verts=Vec::new(); +//TODO: it's probably better to use a shared vertex buffer between all primitives and use indexed rendering instead of generating a unique vertex buffer for each primitive. +pub fn generate_partial_unit_cube(face_descriptions:[Option;6]) -> crate::model::IndexedModel{ + let mut generated_pos=Vec::<[f32;3]>::new(); + let mut generated_tex=Vec::new(); + let mut generated_normal=Vec::new(); + let mut generated_color=Vec::new(); + let mut generated_vertices=Vec::new(); + let mut groups=Vec::new(); let mut transforms=Vec::new(); - let mut generated_polys=Vec::new(); - for (i,maybe_transform) in face_transforms.iter().enumerate(){ - if let Some(transform)=maybe_transform{ - let transform_index=if let Some(transform_index)=transforms.iter().position(|&t|t==transform){ + //note that on a cube every vertex is guaranteed to be unique, so there's no need to hash them against existing vertices. + for (i,maybe_face_description) in face_descriptions.iter().enumerate(){ + if let Some(face_description)=maybe_face_description{ + //assume that scanning short lists is faster than hashing. + let transform_index=if let Some(transform_index)=transforms.iter().position(|&transform|transform==face_description.transform){ transform_index }else{ //create new transform_index let transform_index=transforms.len(); - transforms.push(transform); - for vert in default_verts{ - generated_verts.push(*transform.transform_point2(glam::vec2(vert[0],vert[1])).as_ref()); + transforms.push(face_description.transform); + for tex in CUBE_DEFAULT_TEXTURE_COORDS{ + generated_tex.push(*face_description.transform.transform_point2(glam::Vec2::from_array(tex)).as_ref()); } transform_index - }; - generated_polys.push(obj::SimplePolygon( - default_polys[i].0.iter().map( - |&v|obj::IndexTuple(v.0,Some(v.1.unwrap()+4*transform_index),v.2) - ).collect() - )); + } as u32; + let color_index=if let Some(color_index)=generated_color.iter().position(|color|color==face_description.color.as_ref()){ + color_index + }else{ + //create new color_index + let color_index=generated_color.len(); + generated_color.push(*face_description.color.as_ref()); + color_index + } as u32; + //always push normal + let normal_index=generated_normal.len() as u32; + generated_normal.push(CUBE_DEFAULT_NORMALS[i]); + //push vertices as they are needed + groups.push(IndexedGroup{ + texture:face_description.texture, + polys:vec![IndexedPolygon{ + vertices:CUBE_DEFAULT_POLYS[i].map(|tup|{ + let pos=CUBE_DEFAULT_VERTICES[tup[0] as usize]; + let pos_index=if let Some(pos_index)=generated_pos.iter().position(|&p|p==pos){ + pos_index + }else{ + //create new pos_index + let pos_index=generated_pos.len(); + generated_pos.push(pos); + pos_index + } as u32; + //always push vertex + let vertex=IndexedVertex{ + pos:pos_index, + tex:tup[1]+4*transform_index, + normal:normal_index, + color:color_index, + }; + let vert_index=generated_vertices.len(); + generated_vertices.push(vertex); + vert_index as u32 + }).to_vec(), + }], + }); } } - let mut vertices = Vec::new(); - let mut vertex_index = std::collections::HashMap::::new(); - let mut entities = Vec::new(); - for group in object.groups { - let mut indices = Vec::new(); - for poly in group.polys { - for end_index in 2..poly.0.len() { - for &index in &[0, end_index - 1, end_index] { - let vert = poly.0[index]; - if let Some(&i)=vertex_index.get(&vert){ - indices.push(i); - }else{ - let i=vertices.len() as u16; - vertices.push(Vertex { - pos: data.position[vert.0], - texture: data.texture[vert.1.unwrap()], - normal: data.normal[vert.2.unwrap()], - color, - }); - vertex_index.insert(vert,i); - indices.push(i); - } - } - } - } - entities.push(indices); - } - ModelData { - instances: Vec::new(), - vertices, - entities, - texture, + IndexedModel{ + unique_pos:generated_pos, + unique_tex:generated_tex, + unique_normal:generated_normal, + unique_color:generated_color, + unique_vertices:generated_vertices, + groups, + instances:Vec::new(), } }