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ShaderPlayground / deps / imgui / imgui / examples / example_sdl2_metal / main.mm

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1	// Dear ImGui: standalone example application for SDL2 + Metal
2	// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
3
4	// Learn about Dear ImGui:
5	// - FAQ https://dearimgui.com/faq
6	// - Getting Started https://dearimgui.com/getting-started
7	// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
8	// - Introduction, links and more at the top of imgui.cpp
9
10	#include "imgui.h"
11	#include "imgui_impl_sdl2.h"
12	#include "imgui_impl_metal.h"
13	#include <stdio.h>
14	#include <SDL.h>
15
16	#import <Metal/Metal.h>
17	#import <QuartzCore/QuartzCore.h>
18
19	int main(int, char**)
20	{
21	// Setup Dear ImGui context
22	IMGUI_CHECKVERSION();
23	ImGui::CreateContext();
24	ImGuiIO& io = ImGui::GetIO(); (void)io;
25	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
26	io.ConfigFlags \|= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
27	io.ConfigFlags \|= ImGuiConfigFlags_DockingEnable; // Enable Docking
28	io.ConfigFlags \|= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows
29
30	// Setup style
31	ImGui::StyleColorsDark();
32	//ImGui::StyleColorsLight();
33
34	// When viewports are enabled we tweak WindowRounding/WindowBg so platform windows can look identical to regular ones.
35	ImGuiStyle& style = ImGui::GetStyle();
36	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
37	{
38	style.WindowRounding = 0.0f;
39	style.Colors[ImGuiCol_WindowBg].w = 1.0f;
40	}
41
42	// Load Fonts
43	// - If fonts are not explicitly loaded, Dear ImGui will select an embedded font: either AddFontDefaultVector() or AddFontDefaultBitmap().
44	// This selection is based on (style.FontSizeBase * style.FontScaleMain * style.FontScaleDpi) reaching a small threshold.
45	// - You can load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
46	// - If a file cannot be loaded, AddFont functions will return a nullptr. Please handle those errors in your code (e.g. use an assertion, display an error and quit).
47	// - Read 'docs/FONTS.md' for more instructions and details.
48	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use FreeType for higher quality font rendering.
49	// - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
50	//style.FontSizeBase = 20.0f;
51	//io.Fonts->AddFontDefaultVector();
52	//io.Fonts->AddFontDefaultBitmap();
53	//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf");
54	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
55	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
56	//io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
57	//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf");
58	//IM_ASSERT(font != nullptr);
59
60	// Setup SDL
61	// (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
62	// depending on whether SDL_INIT_GAMECONTROLLER is enabled or disabled.. updating to latest version of SDL is recommended!)
63	if (SDL_Init(SDL_INIT_VIDEO \| SDL_INIT_TIMER \| SDL_INIT_GAMECONTROLLER) != 0)
64	{
65	printf("Error: %s\n", SDL_GetError());
66	return 1;
67	}
68
69	// Inform SDL that we will be using metal for rendering. Without this hint initialization of metal renderer may fail.
70	SDL_SetHint(SDL_HINT_RENDER_DRIVER, "metal");
71
72	// Enable native IME.
73	SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
74
75	SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL+Metal example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 800, SDL_WINDOW_RESIZABLE \| SDL_WINDOW_ALLOW_HIGHDPI);
76	if (window == nullptr)
77	{
78	printf("Error creating window: %s\n", SDL_GetError());
79	return -2;
80	}
81
82	SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED \| SDL_RENDERER_PRESENTVSYNC);
83	if (renderer == nullptr)
84	{
85	printf("Error creating renderer: %s\n", SDL_GetError());
86	return -3;
87	}
88
89	// Setup Platform/Renderer backends
90	CAMetalLayer* layer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(renderer);
91	layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
92	ImGui_ImplMetal_Init(layer.device);
93	ImGui_ImplSDL2_InitForMetal(window);
94
95	id<MTLCommandQueue> commandQueue = [layer.device newCommandQueue];
96	MTLRenderPassDescriptor* renderPassDescriptor = [MTLRenderPassDescriptor new];
97
98	// Our state
99	bool show_demo_window = true;
100	bool show_another_window = false;
101	float clear_color[4] = {0.45f, 0.55f, 0.60f, 1.00f};
102
103	// Main loop
104	bool done = false;
105	while (!done)
106	{
107	@autoreleasepool
108	{
109	// Poll and handle events (inputs, window resize, etc.)
110	// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
111	// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
112	// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
113	// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
114	SDL_Event event;
115	while (SDL_PollEvent(&event))
116	{
117	ImGui_ImplSDL2_ProcessEvent(&event);
118	if (event.type == SDL_QUIT)
119	done = true;
120	if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
121	done = true;
122	}
123
124	int width, height;
125	SDL_GetRendererOutputSize(renderer, &width, &height);
126	layer.drawableSize = CGSizeMake(width, height);
127	id<CAMetalDrawable> drawable = [layer nextDrawable];
128
129	id<MTLCommandBuffer> commandBuffer = [commandQueue commandBuffer];
130	renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0] * clear_color[3], clear_color[1] * clear_color[3], clear_color[2] * clear_color[3], clear_color[3]);
131	renderPassDescriptor.colorAttachments[0].texture = drawable.texture;
132	renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
133	renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
134	id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
135	[renderEncoder pushDebugGroup:@"ImGui demo"];
136
137	// Start the Dear ImGui frame
138	ImGui_ImplMetal_NewFrame(renderPassDescriptor);
139	ImGui_ImplSDL2_NewFrame();
140	ImGui::NewFrame();
141
142	// 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!).
143	if (show_demo_window)
144	ImGui::ShowDemoWindow(&show_demo_window);
145
146	// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
147	{
148	static float f = 0.0f;
149	static int counter = 0;
150
151	ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
152
153	ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
154	ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
155	ImGui::Checkbox("Another Window", &show_another_window);
156
157	ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
158	ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
159
160	if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
161	counter++;
162	ImGui::SameLine();
163	ImGui::Text("counter = %d", counter);
164
165	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
166	ImGui::End();
167	}
168
169	// 3. Show another simple window.
170	if (show_another_window)
171	{
172	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)
173	ImGui::Text("Hello from another window!");
174	if (ImGui::Button("Close Me"))
175	show_another_window = false;
176	ImGui::End();
177	}
178
179	// Rendering
180	ImGui::Render();
181	ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), commandBuffer, renderEncoder);
182
183	// Update and Render additional Platform Windows
184	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
185	{
186	ImGui::UpdatePlatformWindows();
187	ImGui::RenderPlatformWindowsDefault();
188	}
189
190	[renderEncoder popDebugGroup];
191	[renderEncoder endEncoding];
192
193	[commandBuffer presentDrawable:drawable];
194	[commandBuffer commit];
195	}
196	}
197
198	// Cleanup
199	ImGui_ImplMetal_Shutdown();
200	ImGui_ImplSDL2_Shutdown();
201	ImGui::DestroyContext();
202
203	SDL_DestroyRenderer(renderer);
204	SDL_DestroyWindow(window);
205	SDL_Quit();
206
207	return 0;
208	}