fix tangent generation for missing uvs

2 files changed, 15 insertions, 7 deletions

diff --git a/client/src/meshops.rs b/client/src/meshops.rs
index 38c6c7b..afa50ce 100644
--- a/client/src/meshops.rs
+++ b/client/src/meshops.rs
@@ -1,4 +1,4 @@
-use glam::{Vec2, Vec3};
+use glam::{Vec2, Vec3, vec2};
 
 pub fn generate_normals(index: &[[u32; 3]], position: &[Vec3]) -> Vec<Vec3> {
     let mut normal_denom = vec![0; position.len()];
@@ -58,6 +58,8 @@ pub fn generate_tangents(index: &[[u32; 3]], position: &[Vec3], texcoord: &[Vec2
 
 pub fn generate_texcoords(index: &[[u32; 3]], position: &[Vec3]) -> Vec<Vec2> {
     let _ = (index, position);
-    // TODO implement equirectangular projection
-    todo!()
+    // TODO implement equirectangular projection or something
+    (0..position.len())
+        .map(|i| vec2(i as f32 * 0.01, 0.))
+        .collect()
 }
diff --git a/client/src/scene_prepare.rs b/client/src/scene_prepare.rs
index 0e65e72..3a93485 100644
--- a/client/src/scene_prepare.rs
+++ b/client/src/scene_prepare.rs
@@ -120,7 +120,7 @@ pub struct RMeshPart {
 struct TangentBufferSpec {
     index: Resource<Vec<[u32; 3]>>,
     position: Resource<Vec<Vec3>>,
-    texcoord: Resource<Vec<Vec2>>,
+    texcoord: Option<Resource<Vec<Vec2>>>,
 }
 
 #[derive(Debug, Clone, Hash, PartialEq, Eq)]
@@ -280,11 +280,17 @@ impl ScenePreparer {
             num_done += 1;
         }
         for spec in self.generated_tangent_buffers.needed() {
-            if let (Some(index), Some(position), Some(texcoord)) = (
+            if let (Some(index), Some(position), texcoord) = (
                 dls.try_get(spec.index.clone())?,
                 dls.try_get(spec.position.clone())?,
-                dls.try_get(spec.texcoord.clone())?,
+                spec.texcoord.clone().map(|r| dls.try_get(r)).transpose()?,
             ) {
+                let texcoord = match texcoord {
+                    Some(Some(x)) => Some(x),
+                    Some(None) => continue, // tangents provided but still loading
+                    None => None,
+                };
+                let texcoord = texcoord.unwrap_or_else(|| generate_texcoords(&index, &position));
                 let tangents = generate_tangents(&index, &position, &texcoord);
                 let buffer = self.device.create_buffer_init(&BufferInitDescriptor {
                     label: Some("generated tangent"),
@@ -382,7 +388,7 @@ impl ScenePreparer {
                         self.generated_tangent_buffers.try_get(TangentBufferSpec {
                             index: indexres,
                             position: Resource(positionres.0, PhantomData),
-                            texcoord: part.va_texcoord.expect("TODO"),
+                            texcoord: part.va_texcoord,
                         })
                     };