examples.imgui source code

1 //------------------------------------------------------------------------------
2 //  imgui.d
3 //
4 //  Using cimgui + sokol, based on https://github.com/floooh/sokol-zig-imgui-sample
5 //------------------------------------------------------------------------------
6 
7 module examples.imgui;
8 
9 private:
10 
11 import sg = sokol.gfx;
12 import sgapp = sokol.glue;
13 import sapp = sokol.app;
14 import simgui = sokol.imgui;
15 import sgimgui = sokol.gfximgui;
16 import sappimgui = sokol.appimgui;
17 import log = sokol.log;
18 import imgui.cimgui;
19 
20 extern (C):
21 @safe:
22 
23 struct State
24 {
25     sg.PassAction pass_action = {
26         colors: [
27             {
28                 load_action: sg.LoadAction.Clear,
29                 clear_value: {r: 0.0, g: 0.5, b: 1.0, a: 1.0},
30             }
31         ]
32     };
33 }
34 
35 static State state;
36 
37 void init() nothrow
38 {
39     sg.Desc gfx = {
40         environment: sgapp.environment,
41         logger: {func: &log.slog_func}
42     };
43     sappimgui.setup;
44     sg.setup(gfx);
45     simgui.Desc imgui_desc = {0};
46     simgui.setup(imgui_desc);
47 }
48 
49 void frame() @trusted
50 {
51     simgui.FrameDesc imgui_desc = {
52         width: sapp.width(),
53         height: sapp.height(),
54         delta_time: sapp.frameDuration(),
55         dpi_scale: sapp.dpiScale(),
56     };
57     simgui.newFrame(imgui_desc);
58     sappimgui.trackFrame;
59 
60     /*=== UI CODE STARTS HERE ===*/
61     const ImVec2 window_pos = {10, 10};
62     const ImVec2 window_size = {400, 100};
63     SetNextWindowPos(window_pos, ImGuiCond_.ImGuiCond_Once);
64     SetNextWindowSize(window_size, ImGuiCond_.ImGuiCond_Once);
65     Begin("Hello Dear ImGui!".ptr, null, ImGuiWindowFlags_.ImGuiWindowFlags_None);
66     const(char)* label = "Background";
67     float[3] rgb = [
68         state.pass_action.colors[0].clear_value.r,
69         state.pass_action.colors[0].clear_value.g,
70         state.pass_action.colors[0].clear_value.b
71     ];
72     ColorEdit3(label, rgb.ptr, ImGuiColorEditFlags_.ImGuiColorEditFlags_None);
73     End();
74     if (BeginMainMenuBar()) {
75         sgimgui.drawMenu("sokol-gfx");
76         sappimgui.drawMenu("sokol-app");
77         EndMainMenuBar();
78     }
79     sgimgui.draw;
80     sappimgui.draw;
81     /*=== UI CODE ENDS HERE ===*/
82 
83     sg.Pass pass = {action: state.pass_action, swapchain: sgapp.swapchain};
84     sg.beginPass(pass);
85     simgui.render;
86     sg.endPass;
87     sg.commit;
88 }
89 
90 void event(const(sapp.Event)* ev) @trusted nothrow
91 {
92     sappimgui.sappimgui_track_event(ev);
93     simgui.simgui_handle_event(ev);
94 }
95 
96 void cleanup() @safe nothrow
97 {
98     sappimgui.shutdown;
99     simgui.shutdown;
100     sgimgui.shutdown;
101     sg.shutdown;
102 }
103 
104 void main() @safe nothrow
105 {
106     sapp.Desc runner = {
107         window_title: "imgui.d",
108         init_cb: &init,
109         frame_cb: &frame,
110         cleanup_cb: &cleanup,
111         event_cb: &event,
112         width: 800,
113         height: 600,
114         icon: {sokol_default: true},
115         logger: {func: &log.func}
116     };
117     sapp.run(runner);
118 }
119 
120 version (WebAssembly)
121 {
122     debug
123     {
124         import emscripten.assertd;
125     }
126 }