fn derive_types(model: &gltf::Model) -> Result<Vec<Self>, ModelError> {
        let mut types = vec![Self::None; model.buffer_views.len()];

        // derive mesh primative types
        for mesh in &model.meshes {
            for prim in &mesh.primitives {
                Self::derive_prim(prim, model, &mut types)?;
            }
        }

        // Set image buffers to CPU usage only
        for image in &model.images {
            if let Some(view) = image.buffer_view {
                let view = types.get_mut(view).ok_or_else(|| ModelError::BadIndex {
                    array: "buffer views",
                    got: view,
                    max: model.buffer_views.len(),
                })?;

                Self::set_view(view, Self::CPUBuffer)?;
            }
        }

        // Some buffer views have a buffer type specified in the model format,
        // verify that the provided type matches the infered type or if no
        // type infered, take the type provided.  The last point is why this is
        // required, not a verification step.
        for (idx, view) in model.buffer_views.iter().enumerate() {
            if let Some(target) = view.target {
                let view_type = match target {
                    gltf::BufferViewTarget::ElementArrayBuffer => Self::ElementArrayBuffer,
                    gltf::BufferViewTarget::ArrayBuffer => Self::ArrayBuffer,
                };

                let view = types.get_mut(idx).ok_or_else(|| ModelError::BadIndex {
                    array: "buffer views",
                    got: idx,
                    max: model.buffer_views.len(),
                })?;

                Self::set_view(view, view_type)?;
            }
        }

        // count the number of not-infered buffers
        let none_count = types.iter().filter(|&&x| x == Self::None).count();

        if none_count > 0 {
            return Err(ModelError::BufferViewNoInference);
        }

        Ok(types)
    }
/// Attempt to derive all the buffer view types for a gltf model.
/// Errors if multiple types are derived for one buffer view or if no type
/// is derived for the buffer view.  The latter usually indicates that that
/// part of the specification hasn't been implemented yet.
Attempt to derive all the buffer view types for a gltf model.
Errors if multiple types are derived for one buffer view or if no type
is derived for the buffer view.  The latter usually indicates that that
part of the specification hasn't been implemented yet.
Attempt to derive all the buffer view types for a gltf model . Errors if multiple types are derived for one buffer view or if no type is derived for the buffer view . The latter usually indicates that that part of the specification hasn ' t been implemented yet .
fn derive_types(model: &gltf::Model) -> Result<Vec<Self>, ModelError> {
        let mut types = vec![Self::None; model.buffer_views.len()];
        // derive mesh primative types
        for mesh in &model.meshes {
            for prim in &mesh.primitives {
                Self::derive_prim(prim, model, &mut types)?;
            }
        }
        // Set image buffers to CPU usage only
        for image in &model.images {
            if let Some(view) = image.buffer_view {
                let view = types.get_mut(view).ok_or_else(|| ModelError::BadIndex {
                    array: "buffer views",
                    got: view,
                    max: model.buffer_views.len(),
                })?;
                Self::set_view(view, Self::CPUBuffer)?;
            }
        }
        // Some buffer views have a buffer type specified in the model format,
        // verify that the provided type matches the infered type or if no
        // type infered, take the type provided.  The last point is why this is
        // required, not a verification step.
        for (idx, view) in model.buffer_views.iter().enumerate() {
            if let Some(target) = view.target {
                let view_type = match target {
                    gltf::BufferViewTarget::ElementArrayBuffer => Self::ElementArrayBuffer,
                    gltf::BufferViewTarget::ArrayBuffer => Self::ArrayBuffer,
                };
                let view = types.get_mut(idx).ok_or_else(|| ModelError::BadIndex {
                    array: "buffer views",
                    got: idx,
                    max: model.buffer_views.len(),
                })?;
                Self::set_view(view, view_type)?;
            }
        }
        // count the number of not-infered buffers
        let none_count = types.iter().filter(|&&x| x == Self::None).count();
        if none_count > 0 {
            return Err(ModelError::BufferViewNoInference);
        }
        Ok(types)
    }
fn derive_types ( model : & gltf :: Model ) -> Result < Vec < Self > , ModelError > { let mut types = vec ! [ Self None model buffer_views len ( ) ] ; // derive mesh primative types for mesh in & model . meshes { for prim in & mesh . primitives { Self :: derive_prim ( prim , model , & mut types ) ? ; } } // Set image buffers to CPU usage only for image in & model . images { if let Some ( view ) = image . buffer_view { let view = types . get_mut ( view ) . ok_or_else ( | | ModelError :: BadIndex { array : " " , got : view , max : model . buffer_views . len ( ) , } ) ? ; Self :: set_view ( view , Self :: CPUBuffer ) ? ; } } // Some buffer views have a buffer type specified in the model format, // verify that the provided type matches the infered type or if no // type infered, take the type provided.  The last point is why this is // required, not a verification step. for ( idx , view ) in model . buffer_views . iter ( ) . enumerate ( ) { if let Some ( target ) = view . target { let view_type = match target { gltf :: BufferViewTarget :: ElementArrayBuffer => Self :: ElementArrayBuffer , gltf :: BufferViewTarget :: ArrayBuffer => Self :: ArrayBuffer , } ; let view = types . get_mut ( idx ) . ok_or_else ( | | ModelError :: BadIndex { array : " " , got : idx , max : model . buffer_views . len ( ) , } ) ? ; Self :: set_view ( view , view_type ) ? ; } } // count the number of not-infered buffers let none_count = types . iter ( ) . filter ( | & & x | x == Self :: None ) . count ( ) ; if none_count > 0 { return Err ( ModelError :: BufferViewNoInference ) ; } Ok ( types ) }
Attempt to derive all the buffer view types for a gltf model.
Attempt to derive all the buffer view types for a gltf model .
model
&gltf::Model
model
&gltf::Model