examples.triangle source code

1 //------------------------------------------------------------------------------
2 //  triangle.d
3 //
4 //  Vertex buffer, shader, pipeline state object.
5 //------------------------------------------------------------------------------
6 module examples.triangle;
7 
8 import sg = sokol.gfx;
9 import sapp = sokol.app;
10 import log = sokol.log;
11 import sglue = sokol.glue;
12 import shd = examples.shaders.triangle;
13 
14 extern (C):
15 @safe:
16 
17 struct State
18 {
19     sg.Bindings bind;
20     sg.Pipeline pip;
21 }
22 
23 static State state;
24 
25 static void init()
26 {
27     sg.Desc sg_desc = {
28         environment: sglue.environment(),
29         logger: {func: &log.slog_func},
30     };
31     sg.setup(sg_desc);
32 
33     // create vertex buffer with triangle vertices
34     float[21] vertices = [
35         // positions      colors
36         0.0, 0.5, 0.5, 1.0, 0.0, 0.0, 1.0,
37         0.5, -0.5, 0.5, 0.0, 1.0, 0.0, 1.0,
38         -0.5, -0.5, 0.5, 0.0, 0.0, 1.0, 1.0,
39     ];
40     sg.BufferDesc buf_desc = {data: {ptr: vertices.ptr,
41     size: vertices.sizeof,}};
42     state.bind.vertex_buffers[0] = sg.makeBuffer(buf_desc);
43 
44     // create a shader and pipeline object
45     sg.PipelineDesc pip_desc = {
46         shader: sg.makeShader(shd.triangleShaderDesc(sg.queryBackend())),
47         layout: {
48             attrs: [
49                 shd.ATTR_TRIANGLE_POSITION: {format: sg.VertexFormat.Float3},
50                 shd.ATTR_TRIANGLE_COLOR0: {format: sg.VertexFormat.Float4},
51             ],
52         }
53     };
54     state.pip = sg.makePipeline(pip_desc);
55 }
56 
57 static void frame()
58 {
59     // default pass-action clears to grey
60     sg.Pass pass = {swapchain: sglue.swapchain()};
61     sg.beginPass(pass);
62     sg.applyPipeline(state.pip);
63     sg.applyBindings(state.bind);
64     sg.draw(0, 3, 1);
65     sg.endPass();
66     sg.commit();
67 }
68 
69 static void cleanup()
70 {
71     sg.shutdown();
72 }
73 
74 void main()
75 {
76     sapp.Desc runner = {
77         window_title: "triangle.d",
78         init_cb: &init,
79         frame_cb: &frame,
80         cleanup_cb: &cleanup,
81         width: 800,
82         height: 600,
83         icon: {sokol_default: true},
84         logger: {func: &log.func}
85     };
86     sapp.run(runner);
87 }