PBR

lib/src/core/renderer.rs

@@ -258,6 +258,7 @@ impl Renderer {
         let identity_object = ObjectUniform {
             model: glam::Mat4::IDENTITY,
             emissive: glam::Vec4::ZERO,
+            pbr: glam::Vec4::ZERO,
         };
         queue.write_buffer(&object_buffer, 0, bytemuck::bytes_of(&identity_object));
         let shared_object_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
@@ -1220,6 +1221,7 @@ impl Renderer {
         }
         // Emissive (6.2): write per-slot into the matrix buffer padding (bytes 64-79).
         // The compute pass only overwrites bytes 0-63 (the matrix), so the emissive persists.
+        // PBR (Étape 27): metallic/roughness at bytes 80-95 (always written for correctness).
         for slot in scene.iter_slot_draws().filter(|s| s.active) {
             let mat = slot
                 .mesh
@@ -1230,6 +1232,10 @@ impl Renderer {
                 let offset = (slot.slot_index as u64 * MAT_SLOT_SIZE + 64) as u64;
                 self.queue.write_buffer(&self.matrix_buffer, offset, bytemuck::cast_slice(&mat.emissive));
             }
+            // PBR params (metallic, roughness) — always written (buffer init to 0 is wrong for PBR).
+            let pbr_data: [f32; 4] = [mat.metallic, mat.roughness, 0.0, 0.0];
+            let offset = (slot.slot_index as u64 * MAT_SLOT_SIZE + 80) as u64;
+            self.queue.write_buffer(&self.matrix_buffer, offset, bytemuck::cast_slice(&pbr_data));
         }
 
         // 8c. Étape 23: bloom passes (threshold → blur H → blur V → composite).