Added Model Root node for global transforms.

samples/03_model_render/model_loader.cpp

@@ -513,6 +513,7 @@ ModelLoader::LoadModel(cstr path, cstr name, bool batched)
     }
 
     Nodes nodes;
+    nodes.Add(mat4{1.0f}, -1);
     {
         if (model.defaultScene >= 0)
         {
@@ -533,6 +534,7 @@ ModelLoader::LoadModel(cstr path, cstr name, bool batched)
                 }
                 if (node->scale.size() == 3)
                 {
+                    // We don't handle the scale 0 special case yet.
                     nodeScale = glm::make_vec3(node->scale.data());
                 }
                 if (node->matrix.size() == 16)
@@ -561,7 +563,7 @@ ModelLoader::LoadModel(cstr path, cstr name, bool batched)
             auto *scene = &model.scenes[model.defaultScene];
             for (i32 rootNodeIdx : scene->nodes)
             {
-                processNode(rootNodeIdx, -1);
+                processNode(rootNodeIdx, 0);
             }
         }
     }
@@ -660,8 +662,6 @@ ModelLoader::LoadModel(cstr path, cstr name, bool batched)
         buffer.Destroy(pDevice);
     }
 
-    nodes.Update();
-
     return Model{m_ResourceManager, std::move(textureHandles), std::move(nodes),
                  materialsHandle, positionBufferHandle, normalBufferHandle,
                  texCoord0BufferHandle, color0Handle, indexBuffer, meshPrimitives, nodeHandle};
@@ -717,6 +717,18 @@ Model::operator=(Model &&other) noexcept
     return *this;
 }
 
+const mat4 &
+Model::GetModelTransform() const
+{
+    return m_Nodes[0];
+}
+
+void
+Model::SetModelTransform(const mat4 &transform)
+{
+    m_Nodes.Set(0, transform);
+}
+
 Model::~Model()
 {
     if (!m_ResourceManager)
@@ -735,6 +747,16 @@ Model::~Model()
     m_ResourceManager->Release(m_MaterialsHandle);
 }
 
+void
+Model::Update()
+{
+    if (m_Nodes.Update())
+    {
+        m_ResourceManager->Write(m_NodeHandle, 0, m_Nodes.GetGlobalTransformByteSize(),
+                                 m_Nodes.GetGlobalTransformPtr());
+    }
+}
+
 ModelLoader::ModelLoader(GpuResourceManager *resourceManager, vk::Queue transferQueue, u32 transferQueueIndex,
                          u32 graphicsQueueIndex)
     : m_ResourceManager(resourceManager)

samples/03_model_render/model_loader.h

@@ -7,7 +7,6 @@
 
 #include "buffer.h"
 #include "global.h"
-#include "image.h"
 
 #include "render_resource_manager.h"
 
@@ -92,20 +91,20 @@ struct Nodes
     [[nodiscard]] usize
     GetGlobalTransformByteSize() const
     {
-        return m_Transforms.size() * sizeof m_Transforms[0];
+        return m_GlobalTransforms.size() * sizeof m_GlobalTransforms[0];
     }
 
     [[nodiscard]] const mat4 *
     GetGlobalTransformPtr() const
     {
-        return m_Transforms.data();
+        return m_GlobalTransforms.data();
     }
 
-    void
+    bool
     Update()
     {
         if (!m_Dirty)
-            return;
+            return false;
 
         auto transformIter = m_Transforms.begin();
         auto globalTransformIter = m_GlobalTransforms.begin();
@@ -133,7 +132,7 @@ struct Nodes
                 {
                     // Update w.r.t parent if either local or parent transforms updated.
                     *globalTransformIter = m_GlobalTransforms[parentIdx] * *transformIter;
-                    m_Parents_[parentIdx] |= m_Dirty;       // Set dirty to propagate the update.
+                    m_Parents_[parentIdx] |= DIRTY_BIT;       // Set dirty to propagate the update.
                 }
             }
 
@@ -148,6 +147,7 @@ struct Nodes
         }
 
         m_Dirty = false;
+        return true;
     }
 };
 
@@ -181,13 +181,16 @@ struct Model
     IndexBuffer m_IndexBuffer;
     eastl::vector<MeshPrimitive> m_MeshPrimitives;
 
+    [[nodiscard]] const mat4 &GetModelTransform() const;
+    void SetModelTransform(const mat4 &transform);
+    void Update();
+
     Model(GpuResourceManager *resourceManager, eastl::vector<TextureHandle> &&textureHandles, Nodes&& nodes,
           BufferHandle materialsHandle, BufferHandle vertexPosHandle, BufferHandle normalHandle, BufferHandle uv0Handle, BufferHandle vertexColor,
           const IndexBuffer &indexBuffer, const eastl::vector<MeshPrimitive> &meshPrimitives, BufferHandle nodeHandle);
 
     Model(Model &&other) noexcept;
     Model &operator=(Model &&other) noexcept;
-
     ~Model();
 
     DISALLOW_COPY_AND_ASSIGN(Model);

samples/03_model_render/model_render.cpp

@@ -236,7 +236,9 @@ main(int, char **)
     {
         Time::Update();
 
-        camera.m_Model *= rotate(mat4{1.0f}, Cast<f32>(45.0_deg * Time::m_Delta), vec3(0.0f, 1.0f, 0.0f));
+        model.SetModelTransform(
+            rotate(model.GetModelTransform(), Cast<f32>(45.0_deg * Time::m_Delta), vec3(0.0f, 1.0f, 0.0f)));
+        model.Update();
         ubo.Write(&device, 0, sizeof camera, &camera);
 
         Frame *currentFrame = frameManager.GetNextFrame(&swapchain, &window);

samples/03_model_render/render_resource_manager.cpp

@@ -215,6 +215,12 @@ GpuResourceManager::Commit(StorageBuffer *storageBuffer)
     return handle;
 }
 
+void
+GpuResourceManager::Write(const BufferHandle handle, const usize offset, const usize size, const void *data)
+{
+    m_BufferManager.Fetch(handle)->Write(m_Device, offset, size, data);
+}
+
 void
 GpuResourceManager::EraseWrites(u32 handleIndex, HandleType handleType)
 {

samples/03_model_render/render_resource_manager.h

@@ -115,6 +115,7 @@ public:
     vk::DescriptorSet m_DescriptorSet;
 
     BufferHandle Commit(StorageBuffer *storageBuffer);
+    void Write(BufferHandle handle, usize offset, usize size, const void *data);
     void Release(BufferHandle handle);
     TextureHandle Commit(Texture *texture);
     void Release(TextureHandle handle);