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// Dear ImGui: standalone example application for using GLFW + WebGPU
// - Emscripten is supported for publishing on web. See https://emscripten.org.
// - Dawn is used as a WebGPU implementation on desktop.

// Learn about Dear ImGui:
// - FAQ                  https://dearimgui.com/faq
// - Getting Started      https://dearimgui.com/getting-started
// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
// - Introduction, links and more at the top of imgui.cpp

#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_wgpu.h"
#include <stdio.h>

#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/html5.h>
#include <emscripten/html5_webgpu.h>
#else
#include <webgpu/webgpu_glfw.h>
#endif

#include <GLFW/glfw3.h>
#include <webgpu/webgpu.h>
#include <webgpu/webgpu_cpp.h>

// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
#ifdef __EMSCRIPTEN__
#include "../libs/emscripten/emscripten_mainloop_stub.h"
#endif

// Global WebGPU required states
static WGPUInstance      wgpu_instance = nullptr;
static WGPUDevice        wgpu_device = nullptr;
static WGPUSurface       wgpu_surface = nullptr;
static WGPUTextureFormat wgpu_preferred_fmt = WGPUTextureFormat_RGBA8Unorm;
static WGPUSwapChain     wgpu_swap_chain = nullptr;
static int               wgpu_swap_chain_width = 1280;
static int               wgpu_swap_chain_height = 720;

// Forward declarations
static bool InitWGPU(GLFWwindow* window);
static void CreateSwapChain(int width, int height);

static void glfw_error_callback(int error, const char* description)
{
    printf("GLFW Error %d: %s\n", error, description);
}

static void wgpu_error_callback(WGPUErrorType error_type, const char* message, void*)
{
    const char* error_type_lbl = "";
    switch (error_type)
    {
    case WGPUErrorType_Validation:  error_type_lbl = "Validation"; break;
    case WGPUErrorType_OutOfMemory: error_type_lbl = "Out of memory"; break;
    case WGPUErrorType_Unknown:     error_type_lbl = "Unknown"; break;
    case WGPUErrorType_DeviceLost:  error_type_lbl = "Device lost"; break;
    default:                        error_type_lbl = "Unknown";
    }
    printf("%s error: %s\n", error_type_lbl, message);
}

// Main code
int main(int, char**)
{
    glfwSetErrorCallback(glfw_error_callback);
    if (!glfwInit())
        return 1;

    // Make sure GLFW does not initialize any graphics context.
    // This needs to be done explicitly later.
    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
    GLFWwindow* window = glfwCreateWindow(wgpu_swap_chain_width, wgpu_swap_chain_height, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr);
    if (window == nullptr)
        return 1;

    // Initialize the WebGPU environment
    if (!InitWGPU(window))
    {
        if (window)
            glfwDestroyWindow(window);
        glfwTerminate();
        return 1;
    }
    CreateSwapChain(wgpu_swap_chain_width, wgpu_swap_chain_height);
    glfwShowWindow(window);

    // Setup Dear ImGui context
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); (void)io;
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls

    // Setup Dear ImGui style
    ImGui::StyleColorsDark();
    //ImGui::StyleColorsLight();

    // Setup Platform/Renderer backends
    ImGui_ImplGlfw_InitForOther(window, true);
#ifdef __EMSCRIPTEN__
    ImGui_ImplGlfw_InstallEmscriptenCallbacks(window, "#canvas");
#endif
    ImGui_ImplWGPU_InitInfo init_info;
    init_info.Device = wgpu_device;
    init_info.NumFramesInFlight = 3;
    init_info.RenderTargetFormat = wgpu_preferred_fmt;
    init_info.DepthStencilFormat = WGPUTextureFormat_Undefined;
    ImGui_ImplWGPU_Init(&init_info);

    // Load Fonts
    // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
    // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
    // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
    // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
    // - Read 'docs/FONTS.md' for more instructions and details.
    // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
    // - Emscripten allows preloading a file or folder to be accessible at runtime. See Makefile for details.
    //io.Fonts->AddFontDefault();
#ifndef IMGUI_DISABLE_FILE_FUNCTIONS
    //io.Fonts->AddFontFromFileTTF("fonts/segoeui.ttf", 18.0f);
    //io.Fonts->AddFontFromFileTTF("fonts/DroidSans.ttf", 16.0f);
    //io.Fonts->AddFontFromFileTTF("fonts/Roboto-Medium.ttf", 16.0f);
    //io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f);
    //io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f);
    //ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
    //IM_ASSERT(font != nullptr);
#endif

    // Our state
    bool show_demo_window = true;
    bool show_another_window = false;
    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

    // Main loop
#ifdef __EMSCRIPTEN__
    // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
    // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
    io.IniFilename = nullptr;
    EMSCRIPTEN_MAINLOOP_BEGIN
#else
    while (!glfwWindowShouldClose(window))
#endif
    {
        // Poll and handle events (inputs, window resize, etc.)
        // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
        // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
        // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
        // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
        glfwPollEvents();
        if (glfwGetWindowAttrib(window, GLFW_ICONIFIED) != 0)
        {
            ImGui_ImplGlfw_Sleep(10);
            continue;
        }

        // React to changes in screen size
        int width, height;
        glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
        if (width != wgpu_swap_chain_width || height != wgpu_swap_chain_height)
        {
            ImGui_ImplWGPU_InvalidateDeviceObjects();
            CreateSwapChain(width, height);
            ImGui_ImplWGPU_CreateDeviceObjects();
        }

        // Start the Dear ImGui frame
        ImGui_ImplWGPU_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
        if (show_demo_window)
            ImGui::ShowDemoWindow(&show_demo_window);

        // 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
        {
            static float f = 0.0f;
            static int counter = 0;

            ImGui::Begin("Hello, world!");                                // Create a window called "Hello, world!" and append into it.

            ImGui::Text("This is some useful text.");                     // Display some text (you can use a format strings too)
            ImGui::Checkbox("Demo Window", &show_demo_window);            // Edit bools storing our window open/close state
            ImGui::Checkbox("Another Window", &show_another_window);

            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);                  // Edit 1 float using a slider from 0.0f to 1.0f
            ImGui::ColorEdit3("clear color", (float*)&clear_color);       // Edit 3 floats representing a color

            if (ImGui::Button("Button"))                                  // Buttons return true when clicked (most widgets return true when edited/activated)
                counter++;
            ImGui::SameLine();
            ImGui::Text("counter = %d", counter);

            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
            ImGui::End();
        }

        // 3. Show another simple window.
        if (show_another_window)
        {
            ImGui::Begin("Another Window", &show_another_window);         // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
            ImGui::Text("Hello from another window!");
            if (ImGui::Button("Close Me"))
                show_another_window = false;
            ImGui::End();
        }

        // Rendering
        ImGui::Render();

#ifndef __EMSCRIPTEN__
        // Tick needs to be called in Dawn to display validation errors
        wgpuDeviceTick(wgpu_device);
#endif

        WGPURenderPassColorAttachment color_attachments = {};
        color_attachments.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
        color_attachments.loadOp = WGPULoadOp_Clear;
        color_attachments.storeOp = WGPUStoreOp_Store;
        color_attachments.clearValue = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
        color_attachments.view = wgpuSwapChainGetCurrentTextureView(wgpu_swap_chain);

        WGPURenderPassDescriptor render_pass_desc = {};
        render_pass_desc.colorAttachmentCount = 1;
        render_pass_desc.colorAttachments = &color_attachments;
        render_pass_desc.depthStencilAttachment = nullptr;

        WGPUCommandEncoderDescriptor enc_desc = {};
        WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);

        WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &render_pass_desc);
        ImGui_ImplWGPU_RenderDrawData(ImGui::GetDrawData(), pass);
        wgpuRenderPassEncoderEnd(pass);

        WGPUCommandBufferDescriptor cmd_buffer_desc = {};
        WGPUCommandBuffer cmd_buffer = wgpuCommandEncoderFinish(encoder, &cmd_buffer_desc);
        WGPUQueue queue = wgpuDeviceGetQueue(wgpu_device);
        wgpuQueueSubmit(queue, 1, &cmd_buffer);

#ifndef __EMSCRIPTEN__
        wgpuSwapChainPresent(wgpu_swap_chain);
#endif

        wgpuTextureViewRelease(color_attachments.view);
        wgpuRenderPassEncoderRelease(pass);
        wgpuCommandEncoderRelease(encoder);
        wgpuCommandBufferRelease(cmd_buffer);
    }
#ifdef __EMSCRIPTEN__
    EMSCRIPTEN_MAINLOOP_END;
#endif

    // Cleanup
    ImGui_ImplWGPU_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();

    glfwDestroyWindow(window);
    glfwTerminate();

    return 0;
}

#ifndef __EMSCRIPTEN__
static WGPUAdapter RequestAdapter(WGPUInstance instance)
{
    auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, const char* message, void* pUserData)
    {
        if (status == WGPURequestAdapterStatus_Success)
            *(WGPUAdapter*)(pUserData) = adapter;
        else
            printf("Could not get WebGPU adapter: %s\n", message);
};
    WGPUAdapter adapter;
    wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter);
    return adapter;
}

static WGPUDevice RequestDevice(WGPUAdapter& adapter)
{
    auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, const char* message, void* pUserData)
    {
        if (status == WGPURequestDeviceStatus_Success)
            *(WGPUDevice*)(pUserData) = device;
        else
            printf("Could not get WebGPU device: %s\n", message);
    };
    WGPUDevice device;
    wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device);
    return device;
}
#endif

static bool InitWGPU(GLFWwindow* window)
{
    wgpu::Instance instance = wgpuCreateInstance(nullptr);

#ifdef __EMSCRIPTEN__
    wgpu_device = emscripten_webgpu_get_device();
    if (!wgpu_device)
        return false;
#else
    WGPUAdapter adapter = RequestAdapter(instance.Get());
    if (!adapter)
        return false;
    wgpu_device = RequestDevice(adapter);
#endif

#ifdef __EMSCRIPTEN__
    wgpu::SurfaceDescriptorFromCanvasHTMLSelector html_surface_desc = {};
    html_surface_desc.selector = "#canvas";
    wgpu::SurfaceDescriptor surface_desc = {};
    surface_desc.nextInChain = &html_surface_desc;
    wgpu::Surface surface = instance.CreateSurface(&surface_desc);

    wgpu::Adapter adapter = {};
    wgpu_preferred_fmt = (WGPUTextureFormat)surface.GetPreferredFormat(adapter);
#else
    wgpu::Surface surface = wgpu::glfw::CreateSurfaceForWindow(instance, window);
    if (!surface)
        return false;
    wgpu_preferred_fmt = WGPUTextureFormat_BGRA8Unorm;
#endif

    wgpu_instance = instance.MoveToCHandle();
    wgpu_surface = surface.MoveToCHandle();

    wgpuDeviceSetUncapturedErrorCallback(wgpu_device, wgpu_error_callback, nullptr);

    return true;
}

static void CreateSwapChain(int width, int height)
{
    if (wgpu_swap_chain)
        wgpuSwapChainRelease(wgpu_swap_chain);
    wgpu_swap_chain_width = width;
    wgpu_swap_chain_height = height;
    WGPUSwapChainDescriptor swap_chain_desc = {};
    swap_chain_desc.usage = WGPUTextureUsage_RenderAttachment;
    swap_chain_desc.format = wgpu_preferred_fmt;
    swap_chain_desc.width = width;
    swap_chain_desc.height = height;
    swap_chain_desc.presentMode = WGPUPresentMode_Fifo;
    wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc);
}

	// Dear ImGui: standalone example application for using GLFW + WebGPU
	// - Emscripten is supported for publishing on web. See https://emscripten.org.
	// - Dawn is used as a WebGPU implementation on desktop.

	// Learn about Dear ImGui:
	// - FAQ https://dearimgui.com/faq
	// - Getting Started https://dearimgui.com/getting-started
	// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
	// - Introduction, links and more at the top of imgui.cpp

	#include "imgui.h"
	#include "imgui_impl_glfw.h"
	#include "imgui_impl_wgpu.h"
	#include <stdio.h>

	#ifdef __EMSCRIPTEN__
	#include <emscripten.h>
	#include <emscripten/html5.h>
	#include <emscripten/html5_webgpu.h>
	#else
	#include <webgpu/webgpu_glfw.h>
	#endif

	#include <GLFW/glfw3.h>
	#include <webgpu/webgpu.h>
	#include <webgpu/webgpu_cpp.h>

	// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
	#ifdef __EMSCRIPTEN__
	#include "../libs/emscripten/emscripten_mainloop_stub.h"
	#endif

	// Global WebGPU required states
	static WGPUInstance wgpu_instance = nullptr;
	static WGPUDevice wgpu_device = nullptr;
	static WGPUSurface wgpu_surface = nullptr;
	static WGPUTextureFormat wgpu_preferred_fmt = WGPUTextureFormat_RGBA8Unorm;
	static WGPUSwapChain wgpu_swap_chain = nullptr;
	static int wgpu_swap_chain_width = 1280;
	static int wgpu_swap_chain_height = 720;

	// Forward declarations
	static bool InitWGPU(GLFWwindow* window);
	static void CreateSwapChain(int width, int height);

	static void glfw_error_callback(int error, const char* description)
	{
	printf("GLFW Error %d: %s\n", error, description);
	}

	static void wgpu_error_callback(WGPUErrorType error_type, const char* message, void*)
	{
	const char* error_type_lbl = "";
	switch (error_type)
	{
	case WGPUErrorType_Validation: error_type_lbl = "Validation"; break;
	case WGPUErrorType_OutOfMemory: error_type_lbl = "Out of memory"; break;
	case WGPUErrorType_Unknown: error_type_lbl = "Unknown"; break;
	case WGPUErrorType_DeviceLost: error_type_lbl = "Device lost"; break;
	default: error_type_lbl = "Unknown";
	}
	printf("%s error: %s\n", error_type_lbl, message);
	}

	// Main code
	int main(int, char**)
	{
	glfwSetErrorCallback(glfw_error_callback);
	if (!glfwInit())
	return 1;

	// Make sure GLFW does not initialize any graphics context.
	// This needs to be done explicitly later.
	glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
	GLFWwindow* window = glfwCreateWindow(wgpu_swap_chain_width, wgpu_swap_chain_height, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr);
	if (window == nullptr)
	return 1;

	// Initialize the WebGPU environment
	if (!InitWGPU(window))
	{
	if (window)
	glfwDestroyWindow(window);
	glfwTerminate();
	return 1;
	}
	CreateSwapChain(wgpu_swap_chain_width, wgpu_swap_chain_height);
	glfwShowWindow(window);

	// Setup Dear ImGui context
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void)io;
	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls

	// Setup Dear ImGui style
	ImGui::StyleColorsDark();
	//ImGui::StyleColorsLight();

	// Setup Platform/Renderer backends
	ImGui_ImplGlfw_InitForOther(window, true);
	#ifdef __EMSCRIPTEN__
	ImGui_ImplGlfw_InstallEmscriptenCallbacks(window, "#canvas");
	#endif
	ImGui_ImplWGPU_InitInfo init_info;
	init_info.Device = wgpu_device;
	init_info.NumFramesInFlight = 3;
	init_info.RenderTargetFormat = wgpu_preferred_fmt;
	init_info.DepthStencilFormat = WGPUTextureFormat_Undefined;
	ImGui_ImplWGPU_Init(&init_info);

	// Load Fonts
	// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
	// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
	// - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
	// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
	// - Read 'docs/FONTS.md' for more instructions and details.
	// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
	// - Emscripten allows preloading a file or folder to be accessible at runtime. See Makefile for details.
	//io.Fonts->AddFontDefault();
	#ifndef IMGUI_DISABLE_FILE_FUNCTIONS
	//io.Fonts->AddFontFromFileTTF("fonts/segoeui.ttf", 18.0f);
	//io.Fonts->AddFontFromFileTTF("fonts/DroidSans.ttf", 16.0f);
	//io.Fonts->AddFontFromFileTTF("fonts/Roboto-Medium.ttf", 16.0f);
	//io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f);
	//io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f);
	//ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
	//IM_ASSERT(font != nullptr);
	#endif

	// Our state
	bool show_demo_window = true;
	bool show_another_window = false;
	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

	// Main loop
	#ifdef __EMSCRIPTEN__
	// For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
	// You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
	io.IniFilename = nullptr;
	EMSCRIPTEN_MAINLOOP_BEGIN
	#else
	while (!glfwWindowShouldClose(window))
	#endif
	{
	// Poll and handle events (inputs, window resize, etc.)
	// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
	// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
	// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
	// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
	glfwPollEvents();
	if (glfwGetWindowAttrib(window, GLFW_ICONIFIED) != 0)
	{
	ImGui_ImplGlfw_Sleep(10);
	continue;
	}

	// React to changes in screen size
	int width, height;
	glfwGetFramebufferSize((GLFWwindow*)window, &width, &height);
	if (width != wgpu_swap_chain_width \|\| height != wgpu_swap_chain_height)
	{
	ImGui_ImplWGPU_InvalidateDeviceObjects();
	CreateSwapChain(width, height);
	ImGui_ImplWGPU_CreateDeviceObjects();
	}

	// Start the Dear ImGui frame
	ImGui_ImplWGPU_NewFrame();
	ImGui_ImplGlfw_NewFrame();
	ImGui::NewFrame();

	// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
	if (show_demo_window)
	ImGui::ShowDemoWindow(&show_demo_window);

	// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
	{
	static float f = 0.0f;
	static int counter = 0;

	ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.

	ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
	ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
	ImGui::Checkbox("Another Window", &show_another_window);

	ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
	ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color

	if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
	counter++;
	ImGui::SameLine();
	ImGui::Text("counter = %d", counter);

	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
	ImGui::End();
	}

	// 3. Show another simple window.
	if (show_another_window)
	{
	ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
	ImGui::Text("Hello from another window!");
	if (ImGui::Button("Close Me"))
	show_another_window = false;
	ImGui::End();
	}

	// Rendering
	ImGui::Render();

	#ifndef __EMSCRIPTEN__
	// Tick needs to be called in Dawn to display validation errors
	wgpuDeviceTick(wgpu_device);
	#endif

	WGPURenderPassColorAttachment color_attachments = {};
	color_attachments.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
	color_attachments.loadOp = WGPULoadOp_Clear;
	color_attachments.storeOp = WGPUStoreOp_Store;
	color_attachments.clearValue = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
	color_attachments.view = wgpuSwapChainGetCurrentTextureView(wgpu_swap_chain);

	WGPURenderPassDescriptor render_pass_desc = {};
	render_pass_desc.colorAttachmentCount = 1;
	render_pass_desc.colorAttachments = &color_attachments;
	render_pass_desc.depthStencilAttachment = nullptr;

	WGPUCommandEncoderDescriptor enc_desc = {};
	WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);

	WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &render_pass_desc);
	ImGui_ImplWGPU_RenderDrawData(ImGui::GetDrawData(), pass);
	wgpuRenderPassEncoderEnd(pass);

	WGPUCommandBufferDescriptor cmd_buffer_desc = {};
	WGPUCommandBuffer cmd_buffer = wgpuCommandEncoderFinish(encoder, &cmd_buffer_desc);
	WGPUQueue queue = wgpuDeviceGetQueue(wgpu_device);
	wgpuQueueSubmit(queue, 1, &cmd_buffer);

	#ifndef __EMSCRIPTEN__
	wgpuSwapChainPresent(wgpu_swap_chain);
	#endif

	wgpuTextureViewRelease(color_attachments.view);
	wgpuRenderPassEncoderRelease(pass);
	wgpuCommandEncoderRelease(encoder);
	wgpuCommandBufferRelease(cmd_buffer);
	}
	#ifdef __EMSCRIPTEN__
	EMSCRIPTEN_MAINLOOP_END;
	#endif

	// Cleanup
	ImGui_ImplWGPU_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();

	glfwDestroyWindow(window);
	glfwTerminate();

	return 0;
	}

	#ifndef __EMSCRIPTEN__
	static WGPUAdapter RequestAdapter(WGPUInstance instance)
	{
	auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, const char* message, void* pUserData)
	{
	if (status == WGPURequestAdapterStatus_Success)
	(WGPUAdapter)(pUserData) = adapter;
	else
	printf("Could not get WebGPU adapter: %s\n", message);
	};
	WGPUAdapter adapter;
	wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter);
	return adapter;
	}

	static WGPUDevice RequestDevice(WGPUAdapter& adapter)
	{
	auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, const char* message, void* pUserData)
	{
	if (status == WGPURequestDeviceStatus_Success)
	(WGPUDevice)(pUserData) = device;
	else
	printf("Could not get WebGPU device: %s\n", message);
	};
	WGPUDevice device;
	wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device);
	return device;
	}
	#endif

	static bool InitWGPU(GLFWwindow* window)
	{
	wgpu::Instance instance = wgpuCreateInstance(nullptr);

	#ifdef __EMSCRIPTEN__
	wgpu_device = emscripten_webgpu_get_device();
	if (!wgpu_device)
	return false;
	#else
	WGPUAdapter adapter = RequestAdapter(instance.Get());
	if (!adapter)
	return false;
	wgpu_device = RequestDevice(adapter);
	#endif

	#ifdef __EMSCRIPTEN__
	wgpu::SurfaceDescriptorFromCanvasHTMLSelector html_surface_desc = {};
	html_surface_desc.selector = "#canvas";
	wgpu::SurfaceDescriptor surface_desc = {};
	surface_desc.nextInChain = &html_surface_desc;
	wgpu::Surface surface = instance.CreateSurface(&surface_desc);

	wgpu::Adapter adapter = {};
	wgpu_preferred_fmt = (WGPUTextureFormat)surface.GetPreferredFormat(adapter);
	#else
	wgpu::Surface surface = wgpu::glfw::CreateSurfaceForWindow(instance, window);
	if (!surface)
	return false;
	wgpu_preferred_fmt = WGPUTextureFormat_BGRA8Unorm;
	#endif

	wgpu_instance = instance.MoveToCHandle();
	wgpu_surface = surface.MoveToCHandle();

	wgpuDeviceSetUncapturedErrorCallback(wgpu_device, wgpu_error_callback, nullptr);

	return true;
	}

	static void CreateSwapChain(int width, int height)
	{
	if (wgpu_swap_chain)
	wgpuSwapChainRelease(wgpu_swap_chain);
	wgpu_swap_chain_width = width;
	wgpu_swap_chain_height = height;
	WGPUSwapChainDescriptor swap_chain_desc = {};
	swap_chain_desc.usage = WGPUTextureUsage_RenderAttachment;
	swap_chain_desc.format = wgpu_preferred_fmt;
	swap_chain_desc.width = width;
	swap_chain_desc.height = height;
	swap_chain_desc.presentMode = WGPUPresentMode_Fifo;
	wgpu_swap_chain = wgpuDeviceCreateSwapChain(wgpu_device, wgpu_surface, &swap_chain_desc);
	}