Merge branch 'vulkan_fix_master' into vulkan_fix_docking (WARNING: as is the validation layer will error on same vertex/index buffer being used for all frames)

# Conflicts:
#	examples/imgui_impl_vulkan.cpp
#	examples/imgui_impl_vulkan.h

docs/CHANGELOG.txt

@@ -98,16 +98,12 @@ Other changes:
 -----------------------------------------------------------------------
 
 Breaking Changes:
-- Examples: Vulkan: Added extra parameter to ImGui_ImplVulkan_RenderDrawData(). Engine/app is
+- Examples: Vulkan: Added MinImageCount/ImageCount fields in ImGui_ImplVulkan_InitInfo, required
-  in charge of owning/storing 1 ImGui_ImplVulkan_FrameRenderBuffers per in-flight rendering frame.
+  during initialization to specify the number of in-flight image requested by swap chains.
-  (The demo helper ImGui_ImplVulkanH_Window structure carries them.) (#2461, #2348, #2378, #2097)
-- Examples: Vulkan: Added MinImageCount field in ImGui_ImplVulkan_InitInfo, required during
-  initialization to specify the number of in-flight image requested by swap chains.
   (was previously a hard #define IMGUI_VK_QUEUED_FRAMES 2). (#2071, #1677) [@nathanvoglsam]
 - Examples: Vulkan: Tidying up the demo/internals helpers (most engine/app should not rely
   on them but it is possible you have!).
 
-
 Other Changes:
 - InputText: Fixed selection background starts rendering one frame after the cursor movement
   when first transitioning from no-selection to has-selection. (Bug in 1.69) (#2436) [@Nazg-Gul]
@@ -120,8 +116,10 @@ Other Changes:
 - Examples: OpenGL: Added a dummy GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized
   GL function loaders early, and help users understand what they are missing. (#2421)
 - Examples: OpenGL3: Minor tweaks + not calling glBindBuffer more than necessary in the render loop.
+- Examples: Vulkan: Fixed in-flight buffers issues when using multi-viewports. (#2461, #2348, #2378, #2097)
 - Examples: Vulkan: Added missing support for 32-bit indices (#define ImDrawIdx unsigned int).
 - Examples: Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
+- Examples: Vulkan: Added ImGui_ImplVulkan_SetMinImageCount() to change min image count at runtime. (#2071) [@nathanvoglsam]
 - Examples: DirectX9: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects(). (#2454)
 - Examples: GLUT: Fixed existing FreeGLUT example to work with regular GLUT. (#2465) [@andrewwillmott]
 - Examples: GLUT: Renamed imgui_impl_freeglut.cpp/.h to imgui_impl_glut.cpp/.h. (#2465) [@andrewwillmott]

examples/example_glfw_vulkan/main.cpp

@@ -287,7 +287,7 @@ static void FrameRender(ImGui_ImplVulkanH_Window* wd)
     }
 
     // Record Imgui Draw Data and draw funcs into command buffer
-    ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), fd->CommandBuffer, &fd->RenderBuffers);
+    ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), fd->CommandBuffer);
 
     // Submit command buffer
     vkCmdEndRenderPass(fd->CommandBuffer);
@@ -403,6 +403,7 @@ int main(int, char**)
     init_info.DescriptorPool = g_DescriptorPool;
     init_info.Allocator = g_Allocator;
     init_info.MinImageCount = g_MinImageCount;
+    init_info.ImageCount = wd->ImageCount;
     init_info.CheckVkResultFn = check_vk_result;
     ImGui_ImplVulkan_Init(&init_info, wd->RenderPass);
 
@@ -468,8 +469,8 @@ int main(int, char**)
         if (g_SwapChainRebuild)
         {
             g_SwapChainRebuild = false;
+            ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount);
             ImGui_ImplVulkanH_CreateWindow(g_Instance, g_PhysicalDevice, g_Device, &g_WindowData, g_QueueFamily, g_Allocator, g_SwapChainResizeWidth, g_SwapChainResizeHeight, g_MinImageCount);
-            ImGui_ImplVulkan_SetSwapChainMinImageCount(g_MinImageCount);
             g_WindowData.FrameIndex = 0;
         }
 

examples/example_sdl_vulkan/main.cpp

@@ -279,7 +279,7 @@ static void FrameRender(ImGui_ImplVulkanH_Window* wd)
     }
 
     // Record Imgui Draw Data and draw funcs into command buffer
-    ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), fd->CommandBuffer, &fd->RenderBuffers);
+    ImGui_ImplVulkan_RenderDrawData(ImGui::GetDrawData(), fd->CommandBuffer);
 
     // Submit command buffer
     vkCmdEndRenderPass(fd->CommandBuffer);
@@ -387,6 +387,7 @@ int main(int, char**)
     init_info.DescriptorPool = g_DescriptorPool;
     init_info.Allocator = g_Allocator;
     init_info.MinImageCount = g_MinImageCount;
+    init_info.ImageCount = wd->ImageCount;
     init_info.CheckVkResultFn = check_vk_result;
     ImGui_ImplVulkan_Init(&init_info, wd->RenderPass);
 
@@ -465,8 +466,8 @@ int main(int, char**)
         if (g_SwapChainRebuild)
         {
             g_SwapChainRebuild = false;
+            ImGui_ImplVulkan_SetMinImageCount(g_MinImageCount);
             ImGui_ImplVulkanH_CreateWindow(g_Instance, g_PhysicalDevice, g_Device, &g_WindowData, g_QueueFamily, g_Allocator, g_SwapChainResizeWidth, g_SwapChainResizeHeight, g_MinImageCount);
-            ImGui_ImplVulkan_SetSwapChainMinImageCount(g_MinImageCount);
             g_WindowData.FrameIndex = 0;
         }
 

examples/imgui_impl_vulkan.cpp

@@ -21,8 +21,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2019-XX-XX: *BREAKING CHANGE*: Vulkan: Added extra parameter to ImGui_ImplVulkan_RenderDrawData(). Engine/app is in charge of owning/storing 1 ImGui_ImplVulkan_FrameRenderBuffers per in-flight rendering frame. (The demo helper ImGui_ImplVulkanH_Window structure carries them.)
+//  2019-XX-XX: *BREAKING CHANGE*: Vulkan: Added ImageCount/MinImageCount fields in ImGui_ImplVulkan_InitInfo, required for initialization (was previously a hard #define IMGUI_VK_QUEUED_FRAMES 2). Added ImGui_ImplVulkan_SetMinImageCount().
-//  2019-XX-XX: *BREAKING CHANGE*: Vulkan: Added MinImageCount field in ImGui_ImplVulkan_InitInfo, required for initialization (was previously a hard #define IMGUI_VK_QUEUED_FRAMES 2). Added ImGui_ImplVulkan_SetSwapChainMinImageCount().
 //  2019-XX-XX: Vulkan: Added VkInstance argument to ImGui_ImplVulkanH_CreateWindow() optional helper.
 //  2019-04-04: Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
 //  2019-04-01: Vulkan: Support for 32-bit index buffer (#define ImDrawIdx unsigned int).
@@ -45,6 +44,27 @@
 #include "imgui_impl_vulkan.h"
 #include <stdio.h>
 
+// Reusable buffers used for rendering 1 current in-flight frame, for ImGui_ImplVulkan_RenderDrawData()
+// [Please zero-clear before use!]
+struct ImGui_ImplVulkanH_FrameRenderBuffers
+{
+    VkDeviceMemory      VertexBufferMemory;
+    VkDeviceMemory      IndexBufferMemory;
+    VkDeviceSize        VertexBufferSize;
+    VkDeviceSize        IndexBufferSize;
+    VkBuffer            VertexBuffer;
+    VkBuffer            IndexBuffer;
+};
+
+// Each viewport will hold 1 ImGui_ImplVulkanH_WindowRenderBuffers
+// [Please zero-clear before use!]
+struct ImGui_ImplVulkanH_WindowRenderBuffers
+{
+    uint32_t            Index;
+    uint32_t            Count;
+    ImGui_ImplVulkanH_FrameRenderBuffers*   FrameRenderBuffers;
+};
+
 // Vulkan data
 static ImGui_ImplVulkan_InitInfo g_VulkanInitInfo = {};
 static VkRenderPass             g_RenderPass = VK_NULL_HANDLE;
@@ -63,11 +83,16 @@ static VkImageView              g_FontView = VK_NULL_HANDLE;
 static VkDeviceMemory           g_UploadBufferMemory = VK_NULL_HANDLE;
 static VkBuffer                 g_UploadBuffer = VK_NULL_HANDLE;
 
+// Render buffers
+static ImGui_ImplVulkanH_WindowRenderBuffers    g_MainWindowRenderBuffers;
+
 // Forward Declarations
-void ImGui_ImplVulkanH_DestroyFrame(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_Frame* fd, const VkAllocationCallbacks* allocator);
+void ImGui_ImplVulkanH_DestroyFrame(VkDevice device, ImGui_ImplVulkanH_Frame* fd, const VkAllocationCallbacks* allocator);
-void ImGui_ImplVulkanH_DestroyFrameSemaphores(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_FrameSemaphores* fsd, const VkAllocationCallbacks* allocator);
+void ImGui_ImplVulkanH_DestroyFrameSemaphores(VkDevice device, ImGui_ImplVulkanH_FrameSemaphores* fsd, const VkAllocationCallbacks* allocator);
-void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count);
+void ImGui_ImplVulkanH_DestroyFrameRenderBuffers(VkDevice device, ImGui_ImplVulkanH_FrameRenderBuffers* buffers, const VkAllocationCallbacks* allocator);
-void ImGui_ImplVulkanH_CreateWindowCommandBuffers(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, uint32_t queue_family, const VkAllocationCallbacks* allocator);
+void ImGui_ImplVulkanH_DestroyWindowRenderBuffers(VkDevice device, ImGui_ImplVulkanH_WindowRenderBuffers* buffers, const VkAllocationCallbacks* allocator);
+void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count);
+void ImGui_ImplVulkanH_CreateWindowCommandBuffers(VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, uint32_t queue_family, const VkAllocationCallbacks* allocator);
 
 //-----------------------------------------------------------------------------
 // SHADERS
@@ -239,7 +264,7 @@ static void CreateOrResizeBuffer(VkBuffer& buffer, VkDeviceMemory& buffer_memory
 
 // Render function
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
-void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer, ImGui_ImplVulkan_FrameRenderBuffers* fd)
+void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
     int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
@@ -248,23 +273,37 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
         return;
 
     ImGui_ImplVulkan_InitInfo* v = &g_VulkanInitInfo;
+
+    // Allocate array to store enough vertex/index buffers
+    ImGui_ImplVulkanH_WindowRenderBuffers* wrb = &g_MainWindowRenderBuffers;
+    if (wrb->FrameRenderBuffers == NULL)
+    {
+        wrb->Index = 0;
+        wrb->Count = v->ImageCount;
+        wrb->FrameRenderBuffers = new ImGui_ImplVulkanH_FrameRenderBuffers[wrb->Count];
+        memset(wrb->FrameRenderBuffers, 0, sizeof(ImGui_ImplVulkanH_FrameRenderBuffers) * wrb->Count);
+    }
+    IM_ASSERT(wrb->Count == v->ImageCount);
+    wrb->Index = (wrb->Index + 1) % wrb->Count;
+    ImGui_ImplVulkanH_FrameRenderBuffers* rb = &wrb->FrameRenderBuffers[wrb->Index];
+
     VkResult err;
 
-    // Create the Vertex and Index buffers:
+    // Create or resize the vertex/index buffers
     size_t vertex_size = draw_data->TotalVtxCount * sizeof(ImDrawVert);
     size_t index_size = draw_data->TotalIdxCount * sizeof(ImDrawIdx);
-    if (fd->VertexBuffer == VK_NULL_HANDLE || fd->VertexBufferSize < vertex_size)
+    if (rb->VertexBuffer == VK_NULL_HANDLE || rb->VertexBufferSize < vertex_size)
-        CreateOrResizeBuffer(fd->VertexBuffer, fd->VertexBufferMemory, fd->VertexBufferSize, vertex_size, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);
+        CreateOrResizeBuffer(rb->VertexBuffer, rb->VertexBufferMemory, rb->VertexBufferSize, vertex_size, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT);
-    if (fd->IndexBuffer == VK_NULL_HANDLE || fd->IndexBufferSize < index_size)
+    if (rb->IndexBuffer == VK_NULL_HANDLE || rb->IndexBufferSize < index_size)
-        CreateOrResizeBuffer(fd->IndexBuffer, fd->IndexBufferMemory, fd->IndexBufferSize, index_size, VK_BUFFER_USAGE_INDEX_BUFFER_BIT);
+        CreateOrResizeBuffer(rb->IndexBuffer, rb->IndexBufferMemory, rb->IndexBufferSize, index_size, VK_BUFFER_USAGE_INDEX_BUFFER_BIT);
 
     // Upload vertex/index data into a single contiguous GPU buffer
     {
         ImDrawVert* vtx_dst = NULL;
         ImDrawIdx* idx_dst = NULL;
-        err = vkMapMemory(v->Device, fd->VertexBufferMemory, 0, vertex_size, 0, (void**)(&vtx_dst));
+        err = vkMapMemory(v->Device, rb->VertexBufferMemory, 0, vertex_size, 0, (void**)(&vtx_dst));
         check_vk_result(err);
-        err = vkMapMemory(v->Device, fd->IndexBufferMemory, 0, index_size, 0, (void**)(&idx_dst));
+        err = vkMapMemory(v->Device, rb->IndexBufferMemory, 0, index_size, 0, (void**)(&idx_dst));
         check_vk_result(err);
         for (int n = 0; n < draw_data->CmdListsCount; n++)
         {
@@ -276,15 +315,15 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
         }
         VkMappedMemoryRange range[2] = {};
         range[0].sType = VK_STRUCTURE_TYPE_MAPPED_MEMORY_RANGE;
-        range[0].memory = fd->VertexBufferMemory;
+        range[0].memory = rb->VertexBufferMemory;
         range[0].size = VK_WHOLE_SIZE;
         range[1].sType = VK_STRUCTURE_TYPE_MAPPED_MEMORY_RANGE;
-        range[1].memory = fd->IndexBufferMemory;
+        range[1].memory = rb->IndexBufferMemory;
         range[1].size = VK_WHOLE_SIZE;
         err = vkFlushMappedMemoryRanges(v->Device, 2, range);
         check_vk_result(err);
-        vkUnmapMemory(v->Device, fd->VertexBufferMemory);
+        vkUnmapMemory(v->Device, rb->VertexBufferMemory);
-        vkUnmapMemory(v->Device, fd->IndexBufferMemory);
+        vkUnmapMemory(v->Device, rb->IndexBufferMemory);
     }
 
     // Bind pipeline and descriptor sets:
@@ -296,10 +335,10 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
 
     // Bind Vertex And Index Buffer:
     {
-        VkBuffer vertex_buffers[1] = { fd->VertexBuffer };
+        VkBuffer vertex_buffers[1] = { rb->VertexBuffer };
         VkDeviceSize vertex_offset[1] = { 0 };
         vkCmdBindVertexBuffers(command_buffer, 0, 1, vertex_buffers, vertex_offset);
-        vkCmdBindIndexBuffer(command_buffer, fd->IndexBuffer, 0, sizeof(ImDrawIdx) == 2 ? VK_INDEX_TYPE_UINT16 : VK_INDEX_TYPE_UINT32);
+        vkCmdBindIndexBuffer(command_buffer, rb->IndexBuffer, 0, sizeof(ImDrawIdx) == 2 ? VK_INDEX_TYPE_UINT16 : VK_INDEX_TYPE_UINT32);
     }
 
     // Setup viewport:
@@ -738,8 +777,9 @@ void    ImGui_ImplVulkan_DestroyFontUploadObjects()
 void    ImGui_ImplVulkan_DestroyDeviceObjects()
 {
     ImGui_ImplVulkan_InitInfo* v = &g_VulkanInitInfo;
-
+    ImGui_ImplVulkanH_DestroyWindowRenderBuffers(v->Device, &g_MainWindowRenderBuffers, v->Allocator);
     ImGui_ImplVulkan_DestroyFontUploadObjects();
+
     if (g_FontView)             { vkDestroyImageView(v->Device, g_FontView, v->Allocator); g_FontView = VK_NULL_HANDLE; }
     if (g_FontImage)            { vkDestroyImage(v->Device, g_FontImage, v->Allocator); g_FontImage = VK_NULL_HANDLE; }
     if (g_FontMemory)           { vkFreeMemory(v->Device, g_FontMemory, v->Allocator); g_FontMemory = VK_NULL_HANDLE; }
@@ -762,6 +802,7 @@ bool    ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass rend
     IM_ASSERT(info->Queue != VK_NULL_HANDLE);
     IM_ASSERT(info->DescriptorPool != VK_NULL_HANDLE);
     IM_ASSERT(info->MinImageCount >= 2);
+    IM_ASSERT(info->ImageCount >= info->MinImageCount);
     IM_ASSERT(render_pass != VK_NULL_HANDLE);
 
     g_VulkanInitInfo = *info;
@@ -784,28 +825,19 @@ void ImGui_ImplVulkan_NewFrame()
 {
 }
 
-void ImGui_ImplVulkan_SetSwapChainMinImageCount(int min_image_count)
+void ImGui_ImplVulkan_SetMinImageCount(uint32_t min_image_count)
 {
     IM_ASSERT(min_image_count >= 2);
     if (g_VulkanInitInfo.MinImageCount == min_image_count)
         return;
     IM_ASSERT(0); // FIXME-VIEWPORT: Need to recreate all swap chains?
+    ImGui_ImplVulkan_InitInfo* v = &g_VulkanInitInfo;
+    VkResult err = vkDeviceWaitIdle(v->Device);
+    check_vk_result(err);
+    ImGui_ImplVulkanH_DestroyWindowRenderBuffers(v->Device, &g_MainWindowRenderBuffers, v->Allocator);
     g_VulkanInitInfo.MinImageCount = min_image_count;
 }
 
-// This is a public function because we require the user to pass a ImGui_ImplVulkan_FrameRenderBuffers 
-// structure to ImGui_ImplVulkan_RenderDrawData.
-void ImGui_ImplVulkan_DestroyFrameRenderBuffers(VkInstance instance, VkDevice device, ImGui_ImplVulkan_FrameRenderBuffers* buffers, const VkAllocationCallbacks* allocator)
-{
-    (void)instance;
-    if (buffers->VertexBuffer)       { vkDestroyBuffer(device, buffers->VertexBuffer,       allocator); buffers->VertexBuffer = VK_NULL_HANDLE; }
-    if (buffers->VertexBufferMemory) { vkFreeMemory   (device, buffers->VertexBufferMemory, allocator); buffers->VertexBufferMemory = VK_NULL_HANDLE; }
-    if (buffers->IndexBuffer)        { vkDestroyBuffer(device, buffers->IndexBuffer,        allocator); buffers->IndexBuffer = VK_NULL_HANDLE; }
-    if (buffers->IndexBufferMemory)  { vkFreeMemory   (device, buffers->IndexBufferMemory,  allocator); buffers->IndexBufferMemory = VK_NULL_HANDLE; }
-    buffers->VertexBufferSize = 0;
-    buffers->IndexBufferSize = 0;
-}
-
 
 //-------------------------------------------------------------------------
 // Internal / Miscellaneous Vulkan Helpers
@@ -891,16 +923,15 @@ VkPresentModeKHR ImGui_ImplVulkanH_SelectPresentMode(VkPhysicalDevice physical_d
     return VK_PRESENT_MODE_FIFO_KHR; // Always available
 }
 
-void ImGui_ImplVulkanH_CreateWindowCommandBuffers(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, uint32_t queue_family, const VkAllocationCallbacks* allocator)
+void ImGui_ImplVulkanH_CreateWindowCommandBuffers(VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, uint32_t queue_family, const VkAllocationCallbacks* allocator)
 {
-    IM_ASSERT(instance != VK_NULL_HANDLE && physical_device != VK_NULL_HANDLE && device != VK_NULL_HANDLE);
+    IM_ASSERT(physical_device != VK_NULL_HANDLE && device != VK_NULL_HANDLE);
-    (void)instance;
     (void)physical_device;
     (void)allocator;
 
     // Create Command Buffers
     VkResult err;
-    for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+    for (uint32_t i = 0; i < wd->ImageCount; i++)
     {
         ImGui_ImplVulkanH_Frame* fd = &wd->Frames[i];
         ImGui_ImplVulkanH_FrameSemaphores* fsd = &wd->FrameSemaphores[i];
@@ -952,7 +983,7 @@ int ImGui_ImplVulkanH_GetMinImageCountFromPresentMode(VkPresentModeKHR present_m
 }
 
 // Also destroy old swap chain and in-flight frames data, if any.
-void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count)
+void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count)
 {
     VkResult err;
     VkSwapchainKHR old_swapchain = wd->Swapchain;
@@ -961,16 +992,16 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevi
 
     // We don't use ImGui_ImplVulkanH_DestroyWindow() because we want to preserve the old swapchain to create the new one.
     // Destroy old Framebuffer
-    for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+    for (uint32_t i = 0; i < wd->ImageCount; i++)
     {
-        ImGui_ImplVulkanH_DestroyFrame(instance, device, &wd->Frames[i], allocator);
+        ImGui_ImplVulkanH_DestroyFrame(device, &wd->Frames[i], allocator);
-        ImGui_ImplVulkanH_DestroyFrameSemaphores(instance, device, &wd->FrameSemaphores[i], allocator);
+        ImGui_ImplVulkanH_DestroyFrameSemaphores(device, &wd->FrameSemaphores[i], allocator);
     }
     delete[] wd->Frames;
     delete[] wd->FrameSemaphores;
     wd->Frames = NULL;
     wd->FrameSemaphores = NULL;
-    wd->FramesQueueSize = 0;
+    wd->ImageCount = 0;
     if (wd->RenderPass)
         vkDestroyRenderPass(device, wd->RenderPass, allocator);
 
@@ -1014,20 +1045,20 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevi
         }
         err = vkCreateSwapchainKHR(device, &info, allocator, &wd->Swapchain);
         check_vk_result(err);
-        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->FramesQueueSize, NULL);
+        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->ImageCount, NULL);
         check_vk_result(err);
         VkImage backbuffers[16] = {};
-        IM_ASSERT(wd->FramesQueueSize >= min_image_count);
+        IM_ASSERT(wd->ImageCount >= min_image_count);
-        IM_ASSERT(wd->FramesQueueSize < IM_ARRAYSIZE(backbuffers));
+        IM_ASSERT(wd->ImageCount < IM_ARRAYSIZE(backbuffers));
-        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->FramesQueueSize, backbuffers);
+        err = vkGetSwapchainImagesKHR(device, wd->Swapchain, &wd->ImageCount, backbuffers);
         check_vk_result(err);
 
         IM_ASSERT(wd->Frames == NULL);
-        wd->Frames = new ImGui_ImplVulkanH_Frame[wd->FramesQueueSize];
+        wd->Frames = new ImGui_ImplVulkanH_Frame[wd->ImageCount];
-        wd->FrameSemaphores = new ImGui_ImplVulkanH_FrameSemaphores[wd->FramesQueueSize];
+        wd->FrameSemaphores = new ImGui_ImplVulkanH_FrameSemaphores[wd->ImageCount];
-        memset(wd->Frames, 0, sizeof(wd->Frames[0]) * wd->FramesQueueSize);
+        memset(wd->Frames, 0, sizeof(wd->Frames[0]) * wd->ImageCount);
-        memset(wd->FrameSemaphores, 0, sizeof(wd->FrameSemaphores[0]) * wd->FramesQueueSize);
+        memset(wd->FrameSemaphores, 0, sizeof(wd->FrameSemaphores[0]) * wd->ImageCount);
-        for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+        for (uint32_t i = 0; i < wd->ImageCount; i++)
             wd->Frames[i].Backbuffer = backbuffers[i];
     }
     if (old_swapchain)
@@ -1082,7 +1113,7 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevi
         info.components.a = VK_COMPONENT_SWIZZLE_A;
         VkImageSubresourceRange image_range = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
         info.subresourceRange = image_range;
-        for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+        for (uint32_t i = 0; i < wd->ImageCount; i++)
         {
             ImGui_ImplVulkanH_Frame* fd = &wd->Frames[i];
             info.image = fd->Backbuffer;
@@ -1102,7 +1133,7 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevi
         info.width = wd->Width;
         info.height = wd->Height;
         info.layers = 1;
-        for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+        for (uint32_t i = 0; i < wd->ImageCount; i++)
         {
             ImGui_ImplVulkanH_Frame* fd = &wd->Frames[i];
             attachment[0] = fd->BackbufferView;
@@ -1114,8 +1145,9 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkInstance instance, VkPhysicalDevi
 
 void ImGui_ImplVulkanH_CreateWindow(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wd, uint32_t queue_family, const VkAllocationCallbacks* allocator, int width, int height, uint32_t min_image_count)
 {
-    ImGui_ImplVulkanH_CreateWindowSwapChain(instance, physical_device, device, wd, allocator, width, height, min_image_count);
+    (void)instance;
-    ImGui_ImplVulkanH_CreateWindowCommandBuffers(instance, physical_device, device, wd, queue_family, allocator);
+    ImGui_ImplVulkanH_CreateWindowSwapChain(physical_device, device, wd, allocator, width, height, min_image_count);
+    ImGui_ImplVulkanH_CreateWindowCommandBuffers(physical_device, device, wd, queue_family, allocator);
 }
 
 void ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_Window* wd, const VkAllocationCallbacks* allocator)
@@ -1123,10 +1155,10 @@ void ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui
     vkDeviceWaitIdle(device); // FIXME: We could wait on the Queue if we had the queue in wd-> (otherwise VulkanH functions can't use globals)
     //vkQueueWaitIdle(g_Queue);
 
-    for (uint32_t i = 0; i < wd->FramesQueueSize; i++)
+    for (uint32_t i = 0; i < wd->ImageCount; i++)
     {
-        ImGui_ImplVulkanH_DestroyFrame(instance, device, &wd->Frames[i], allocator);
+        ImGui_ImplVulkanH_DestroyFrame(device, &wd->Frames[i], allocator);
-        ImGui_ImplVulkanH_DestroyFrameSemaphores(instance, device, &wd->FrameSemaphores[i], allocator);
+        ImGui_ImplVulkanH_DestroyFrameSemaphores(device, &wd->FrameSemaphores[i], allocator);
     }
     delete[] wd->Frames;
     delete[] wd->FrameSemaphores;
@@ -1139,17 +1171,8 @@ void ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui
     *wd = ImGui_ImplVulkanH_Window();
 }
 
-void ImGui_ImplVulkanH_DestroyFrameSemaphores(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_FrameSemaphores* fsd, const VkAllocationCallbacks* allocator)
+void ImGui_ImplVulkanH_DestroyFrame(VkDevice device, ImGui_ImplVulkanH_Frame* fd, const VkAllocationCallbacks* allocator)
 {
-    (void)instance;
-    vkDestroySemaphore(device, fsd->ImageAcquiredSemaphore, allocator);
-    vkDestroySemaphore(device, fsd->RenderCompleteSemaphore, allocator);
-    fsd->ImageAcquiredSemaphore = fsd->RenderCompleteSemaphore = VK_NULL_HANDLE;
-}
-
-void ImGui_ImplVulkanH_DestroyFrame(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_Frame* fd, const VkAllocationCallbacks* allocator)
-{
-    (void)instance;
     vkDestroyFence(device, fd->Fence, allocator);
     vkFreeCommandBuffers(device, fd->CommandPool, 1, &fd->CommandBuffer);
     vkDestroyCommandPool(device, fd->CommandPool, allocator);
@@ -1159,8 +1182,33 @@ void ImGui_ImplVulkanH_DestroyFrame(VkInstance instance, VkDevice device, ImGui_
 
     vkDestroyImageView(device, fd->BackbufferView, allocator);
     vkDestroyFramebuffer(device, fd->Framebuffer, allocator);
+}
 
-    ImGui_ImplVulkan_DestroyFrameRenderBuffers(instance, device, &fd->RenderBuffers, allocator);
+void ImGui_ImplVulkanH_DestroyFrameSemaphores(VkDevice device, ImGui_ImplVulkanH_FrameSemaphores* fsd, const VkAllocationCallbacks* allocator)
+{
+    vkDestroySemaphore(device, fsd->ImageAcquiredSemaphore, allocator);
+    vkDestroySemaphore(device, fsd->RenderCompleteSemaphore, allocator);
+    fsd->ImageAcquiredSemaphore = fsd->RenderCompleteSemaphore = VK_NULL_HANDLE;
+}
+
+void ImGui_ImplVulkanH_DestroyFrameRenderBuffers(VkDevice device, ImGui_ImplVulkanH_FrameRenderBuffers* buffers, const VkAllocationCallbacks* allocator)
+{
+    if (buffers->VertexBuffer) { vkDestroyBuffer(device, buffers->VertexBuffer, allocator); buffers->VertexBuffer = VK_NULL_HANDLE; }
+    if (buffers->VertexBufferMemory) { vkFreeMemory(device, buffers->VertexBufferMemory, allocator); buffers->VertexBufferMemory = VK_NULL_HANDLE; }
+    if (buffers->IndexBuffer) { vkDestroyBuffer(device, buffers->IndexBuffer, allocator); buffers->IndexBuffer = VK_NULL_HANDLE; }
+    if (buffers->IndexBufferMemory) { vkFreeMemory(device, buffers->IndexBufferMemory, allocator); buffers->IndexBufferMemory = VK_NULL_HANDLE; }
+    buffers->VertexBufferSize = 0;
+    buffers->IndexBufferSize = 0;
+}
+
+void ImGui_ImplVulkanH_DestroyWindowRenderBuffers(VkDevice device, ImGui_ImplVulkanH_WindowRenderBuffers* buffers, const VkAllocationCallbacks* allocator)
+{
+    for (uint32_t n = 0; n < buffers->Count; n++)
+        ImGui_ImplVulkanH_DestroyFrameRenderBuffers(device, &buffers->FrameRenderBuffers[n], allocator);
+    delete[] buffers->FrameRenderBuffers;
+    buffers->FrameRenderBuffers = NULL;
+    buffers->Index = 0;
+    buffers->Count = 0;
 }
 
 
@@ -1286,7 +1334,7 @@ static void ImGui_ImplVulkan_RenderWindow(ImGuiViewport* viewport, void*)
         }
     }
 
-    ImGui_ImplVulkan_RenderDrawData(viewport->DrawData, fd->CommandBuffer, &fd->RenderBuffers);
+    ImGui_ImplVulkan_RenderDrawData(viewport->DrawData, fd->CommandBuffer);
 
     {
         vkCmdEndRenderPass(fd->CommandBuffer);
@@ -1332,8 +1380,8 @@ static void ImGui_ImplVulkan_SwapBuffers(ImGuiViewport* viewport, void*)
     err = vkQueuePresentKHR(v->Queue, &info);
     check_vk_result(err);
 
-    wd->FrameIndex = (wd->FrameIndex + 1) % wd->FramesQueueSize; // This is for the next vkWaitForFences()
+    wd->FrameIndex = (wd->FrameIndex + 1) % wd->ImageCount; // This is for the next vkWaitForFences()
-    wd->SemaphoreIndex = (wd->SemaphoreIndex + 1) % wd->FramesQueueSize; // Now we can use the next set of semaphores
+    wd->SemaphoreIndex = (wd->SemaphoreIndex + 1) % wd->ImageCount; // Now we can use the next set of semaphores
 }
 
 void ImGui_ImplVulkan_InitPlatformInterface()

examples/imgui_impl_vulkan.h

@@ -34,34 +34,20 @@ struct ImGui_ImplVulkan_InitInfo
     VkQueue             Queue;
     VkPipelineCache     PipelineCache;
     VkDescriptorPool    DescriptorPool;
-    int                 MinImageCount;          // >= 2
+    uint32_t            MinImageCount;          // >= 2
+    uint32_t            ImageCount;             // >= MinImageCount
     const VkAllocationCallbacks* Allocator;
     void                (*CheckVkResultFn)(VkResult err);
 };
 
-// Reusable buffers used for rendering by current in-flight frame, for ImGui_ImplVulkan_RenderDrawData()
-// [Please zero-clear before use!]
-// In the examples we store those in the helper ImGui_ImplVulkanH_FrameData structure, however as your own engine/app likely won't use the ImGui_Impl_VulkanH_XXXX helpers,
-// you are expected to hold on as many ImGui_ImplVulkan_FrameRenderBuffers structures on your side as you have in-flight frames (== init_info.FramesQueueSize)
-struct ImGui_ImplVulkan_FrameRenderBuffers
-{
-    VkDeviceMemory      VertexBufferMemory;
-    VkDeviceMemory      IndexBufferMemory;
-    VkDeviceSize        VertexBufferSize;
-    VkDeviceSize        IndexBufferSize;
-    VkBuffer            VertexBuffer;
-    VkBuffer            IndexBuffer;
-};
-
 // Called by user code
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass render_pass);
 IMGUI_IMPL_API void     ImGui_ImplVulkan_Shutdown();
 IMGUI_IMPL_API void     ImGui_ImplVulkan_NewFrame();
-IMGUI_IMPL_API void     ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer, ImGui_ImplVulkan_FrameRenderBuffers* buffers);
+IMGUI_IMPL_API void     ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer);
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer);
 IMGUI_IMPL_API void     ImGui_ImplVulkan_DestroyFontUploadObjects();
-IMGUI_IMPL_API void     ImGui_ImplVulkan_DestroyFrameRenderBuffers(VkInstance instance, VkDevice device, ImGui_ImplVulkan_FrameRenderBuffers* buffers, const VkAllocationCallbacks* allocator);
+IMGUI_IMPL_API void     ImGui_ImplVulkan_SetMinImageCount(uint32_t min_image_count); // To override MinImageCount after initialization (e.g. if swap chain is recreated)
-IMGUI_IMPL_API void     ImGui_ImplVulkan_SetSwapChainMinImageCount(int min_image_count); // To override MinImageCount after initialization
 
 // Called by ImGui_ImplVulkan_Init(), might be useful elsewhere.
 IMGUI_IMPL_API bool     ImGui_ImplVulkan_CreateDeviceObjects();
@@ -105,7 +91,6 @@ struct ImGui_ImplVulkanH_Frame
     VkImage             Backbuffer;
     VkImageView         BackbufferView;
     VkFramebuffer       Framebuffer;
-    ImGui_ImplVulkan_FrameRenderBuffers RenderBuffers;
 };
 
 struct ImGui_ImplVulkanH_FrameSemaphores
@@ -128,12 +113,11 @@ struct ImGui_ImplVulkanH_Window
     bool                ClearEnable;
     VkClearValue        ClearValue;
     uint32_t            FrameIndex;             // Current frame being rendered to (0 <= FrameIndex < FrameInFlightCount)
-    uint32_t            FramesQueueSize;        // Number of simultaneous in-flight frames (returned by vkGetSwapchainImagesKHR, usually derived from min_image_count)
+    uint32_t            ImageCount;             // Number of simultaneous in-flight frames (returned by vkGetSwapchainImagesKHR, usually derived from min_image_count)
     uint32_t            SemaphoreIndex;         // Current set of swapchain wait semaphores we're using (needs to be distinct from per frame data)
     ImGui_ImplVulkanH_Frame*            Frames;
     ImGui_ImplVulkanH_FrameSemaphores*  FrameSemaphores;
 
-
     ImGui_ImplVulkanH_Window() 
     { 
         memset(this, 0, sizeof(*this));