Added Model Root node for global transforms.

aster/swapchain.cpp

@@ -9,6 +9,8 @@
 #include "physical_device.h"
 #include "window.h"
 
+[[nodiscard]] vk::Extent2D GetExtent(const Window *window, vk::SurfaceCapabilitiesKHR *surfaceCapabilities);
+
 Swapchain::Swapchain(const Window *window, const Device *device, NameString &&name)
     : m_Device(device)
       , m_Name(std::move(name))
@@ -52,6 +54,15 @@ void
 Swapchain::Create(const Window *window)
 {
     auto surfaceCapabilities = GetSurfaceCapabilities(m_Device->m_PhysicalDevice, window->m_Surface);
+    m_Extent = GetExtent(window, &surfaceCapabilities);
+
+    while (m_Extent.width == 0 || m_Extent.height == 0)
+    {
+        glfwWaitEvents();
+        surfaceCapabilities = GetSurfaceCapabilities(m_Device->m_PhysicalDevice, window->m_Surface);
+        m_Extent = GetExtent(window, &surfaceCapabilities);
+    }
+
     auto surfaceFormats = GetSurfaceFormats(m_Device->m_PhysicalDevice, window->m_Surface);
     auto presentModes = GetSurfacePresentModes(m_Device->m_PhysicalDevice, window->m_Surface);
 
@@ -83,20 +94,6 @@ Swapchain::Create(const Window *window)
         }
     }
 
-    if (surfaceCapabilities.currentExtent.width != MaxValue<u32>)
-    {
-        m_Extent = surfaceCapabilities.currentExtent;
-    }
-    else
-    {
-        auto [width, height] = window->GetSize();
-        auto [minWidth, minHeight] = surfaceCapabilities.minImageExtent;
-        auto [maxWidth, maxHeight] = surfaceCapabilities.maxImageExtent;
-
-        m_Extent.width = glm::clamp(width, minWidth, maxWidth);
-        m_Extent.height = glm::clamp(height, minHeight, maxHeight);
-    }
-
     u32 swapchainImageCount = 3;
     if (surfaceCapabilities.maxImageCount > 0)
     {
@@ -207,3 +204,21 @@ Swapchain::Cleanup()
         DEBUG("Swapchain '{}' destroyed.", m_Name);
     }
 }
+
+vk::Extent2D
+GetExtent(const Window *window, vk::SurfaceCapabilitiesKHR *surfaceCapabilities)
+{
+    if (surfaceCapabilities->currentExtent.width != MaxValue<u32>)
+    {
+        return surfaceCapabilities->currentExtent;
+    }
+
+    auto [width, height] = window->GetSize();
+    auto [minWidth, minHeight] = surfaceCapabilities->minImageExtent;
+    auto [maxWidth, maxHeight] = surfaceCapabilities->maxImageExtent;
+
+    return {
+        .width = glm::clamp(width, minWidth, maxWidth),
+        .height = glm::clamp(height, minHeight, maxHeight),
+    };
+}

aster/window.cpp

@@ -25,7 +25,7 @@ Window::GetSize() const
 {
     int width;
     int height;
-    glfwGetWindowSize(m_Window, &width, &height);
+    glfwGetFramebufferSize(m_Window, &width, &height);
     return {Cast<u32>(width), Cast<u32>(height)};
 }
 

aster/window.h

@@ -29,6 +29,7 @@ struct Window final
 
     void SetWindowSize(const vk::Extent2D &extent) const noexcept;
     void SetWindowSize(u32 width, u32 height) const noexcept;
+    /// Actual size of the framebuffer being used for the window render.
     [[nodiscard]] vk::Extent2D GetSize() const;
 
     // Ctor/Dtor

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)
@@ -542,14 +544,14 @@ ModelLoader::LoadModel(cstr path, cstr name, bool batched)
                 const mat4 transform =
                     translate(mat4(1.0f), nodeTranslation) * mat4_cast(nodeRotation) * scale(mat4(1.0f), nodeScale) * nodeMatrix;
 
-                const u32 nodeArrayIndex = nodes.Add(transform, parent);
+                const i32 nodeArrayIndex = Cast<i32>(nodes.Add(transform, parent));
                 if (node->mesh >= 0)
                 {
                     auto [start, count] = meshPrimRanges[node->mesh];
                     const auto end = start + count;
                     for (usize i = start; i != end; ++i)
                     {
-                        meshPrimitives[i].m_TransformIdx = Cast<i32>(nodeArrayIndex);
+                        meshPrimitives[i].m_TransformIdx = nodeArrayIndex;
                     }
                 }
 
@@ -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};
@@ -711,12 +711,24 @@ Model::operator=(Model &&other) noexcept
     m_NormalHandle = other.m_NormalHandle;
     m_TexCoord0Handle = other.m_TexCoord0Handle;
     m_VertexColorHandle = other.m_VertexColorHandle;
-    m_NodeHandle = std::move(other.m_NodeHandle);
+    m_NodeHandle = other.m_NodeHandle;
     m_IndexBuffer = other.m_IndexBuffer;
     m_MeshPrimitives = std::move(other.m_MeshPrimitives);
     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"
 
@@ -34,6 +33,7 @@ struct Nodes
 {
     eastl::vector<mat4> m_Transforms;
     eastl::vector<mat4> m_GlobalTransforms;
+    /// Parents are also used for bookkeeping
     eastl::vector<u32> m_Parents_;
     bool m_Dirty = true;
 
@@ -42,10 +42,10 @@ struct Nodes
     constexpr static u32 PARENT_MASK = ~(ROOT_BIT | DIRTY_BIT);
 
     u32
-    Add(const mat4& transform, i32 parent = -1)
+    Add(const mat4& transform, const i32 parent = -1)
     {
         m_Dirty = true;
-        u32 index = Count();
+        const u32 index = Count();
         m_Transforms.push_back(transform);
         m_GlobalTransforms.push_back(transform);
         const u32 parentVal = (parent < 0 ? ROOT_BIT : parent & PARENT_MASK) | DIRTY_BIT;
@@ -91,20 +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();
@@ -113,23 +113,41 @@ struct Nodes
 
         while (parentIter != parentEnd)
         {
-            if (!(*parentIter & ROOT_BIT) && *parentIter & DIRTY_BIT)
+            const bool isRoot = *parentIter & ROOT_BIT;
+            const bool isDirty = *parentIter & DIRTY_BIT;
+
+            if (isRoot)
             {
-                u32 parent = *parentIter & PARENT_MASK;
-                *globalTransformIter = m_GlobalTransforms[parent] * *transformIter;
+                if (isDirty)
+                {
+                    // Copy-update if the root is dirty.
+                    *globalTransformIter = *transformIter;
+                }
             }
             else
             {
-                *globalTransformIter = *transformIter;
+                const u32 parentIdx = *parentIter & PARENT_MASK;
+                const bool isParentDirty = m_Parents_[parentIdx] & DIRTY_BIT;
+                if (isDirty || isParentDirty)
+                {
+                    // Update w.r.t parent if either local or parent transforms updated.
+                    *globalTransformIter = m_GlobalTransforms[parentIdx] * *transformIter;
+                    m_Parents_[parentIdx] |= DIRTY_BIT;       // Set dirty to propagate the update.
+                }
             }
-            *parentIter &= ~DIRTY_BIT;
 
             ++parentIter;
             ++globalTransformIter;
             ++transformIter;
         }
 
+        for (u32 &parentValue : m_Parents_)
+        {
+            parentValue &= ~DIRTY_BIT;  // Unset dirty.
+        }
+
         m_Dirty = false;
+        return true;
     }
 };
 
@@ -163,13 +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);