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Examples: Vulkan: Added calls to supports runtime changing back buffer count. (#2071)

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This commit is contained in:
MindSpunk
2018-09-09 16:04:44 +10:00
committed by omar
parent 1c3311e4d6
commit b88a3b2711
4 changed files with 150 additions and 36 deletions
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48
examples/example_sdl_vulkan/main.cpp
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@ -15,6 +15,8 @@
#define IMGUI_VULKAN_DEBUG_REPORT
#endif
static uint32_t g_MinImageCount = 2;
static bool g_PendingSwapchainRebuild = false;
static VkAllocationCallbacks* g_Allocator = NULL;
static VkInstance g_Instance = VK_NULL_HANDLE;
static VkPhysicalDevice g_PhysicalDevice = VK_NULL_HANDLE;
@ -201,8 +203,8 @@ static void SetupVulkanWindowData(ImGui_ImplVulkanH_WindowData* wd, VkSurfaceKHR
//printf("[vulkan] Selected PresentMode = %d\n", wd->PresentMode);
// Create SwapChain, RenderPass, Framebuffer, etc.
ImGui_ImplVulkanH_CreateWindowDataCommandBuffers(g_PhysicalDevice, g_Device, g_QueueFamily, wd, g_Allocator);
ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, wd, g_Allocator, width, height);
ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, wd, g_Allocator, width, height, g_MinImageCount);
ImGui_ImplVulkanH_CreateWindowDataCommandBuffers(g_PhysicalDevice, g_Device, g_QueueFamily, wd, g_Allocator);
}
static void CleanupVulkan()
@ -296,6 +298,20 @@ static void FramePresent(ImGui_ImplVulkanH_WindowData* wd)
check_vk_result(err);
}
static void RebuildSwapChain(int width, int height)
{
ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, &g_WindowData, g_Allocator, width, height, g_MinImageCount);
ImGui_ImplVulkanH_CreateWindowDataCommandBuffers(g_PhysicalDevice, g_Device, g_QueueFamily, &g_WindowData, g_Allocator);
ImGui_ImplVulkan_SetQueuedFramesCount(g_WindowData.BackBufferCount);
g_WindowData.FrameIndex = 0;
g_PendingSwapchainRebuild = false;
}
static void RebuildSwapChain()
{
RebuildSwapChain(g_WindowData.Width, g_WindowData.Height);
}
int main(int, char**)
{
// Setup SDL
@ -354,6 +370,7 @@ int main(int, char**)
init_info.PipelineCache = g_PipelineCache;
init_info.DescriptorPool = g_DescriptorPool;
init_info.Allocator = g_Allocator;
init_info.QueuedFrames = wd->BackBufferCount;
init_info.CheckVkResultFn = check_vk_result;
ImGui_ImplVulkan_Init(&init_info, wd->RenderPass);
@ -422,9 +439,12 @@ int main(int, char**)
if (event.type == SDL_QUIT)
done = true;
if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED && event.window.windowID == SDL_GetWindowID(window))
ImGui_ImplVulkanH_CreateWindowDataSwapChainAndFramebuffer(g_PhysicalDevice, g_Device, &g_WindowData, g_Allocator, (int)event.window.data1, (int)event.window.data2);
RebuildSwapChain((int)event.window.data1, (int)event.window.data2);
}
if (g_PendingSwapchainRebuild)
RebuildSwapChain();
// Start the Dear ImGui frame
ImGui_ImplVulkan_NewFrame();
ImGui_ImplSDL2_NewFrame(window);
@ -464,6 +484,28 @@ int main(int, char**)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
if (ImGui::Button("Increase"))
{
g_MinImageCount++;
g_PendingSwapchainRebuild = true;
}
ImGui::SameLine();
if (ImGui::Button("Decrease"))
{
if (g_MinImageCount != 2)
{
g_MinImageCount--;
g_PendingSwapchainRebuild = true;
}
}
ImGui::SameLine();
ImGui::Text("Back Buffers: %i", g_MinImageCount);
ImGui::Text("Frame Index %i", wd->FrameIndex);
ImGui::End();
}