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annotate examples/menu.rs @ 746:0ebf6467e4ff

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examples: Add a menu example.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 18 Jan 2020 19:19:51 +0100
parents
children 8a022334a4c4
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746
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1 use luminance::blending::{Equation, Factor};
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2 use luminance::context::GraphicsContext;
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3 use luminance::pipeline::{BoundTexture, PipelineState};
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4 use luminance::pixel::NormUnsigned;
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5 use luminance::render_state::RenderState;
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6 use luminance::shader::program::{Program, Uniform};
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7 use luminance::tess::{Mode, TessBuilder};
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8 use luminance::texture::{Dim2, Flat};
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9 use luminance_derive::{Semantics, Vertex, UniformInterface};
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10 use luminance_glfw::{Action, Key, WindowEvent, GlfwSurface, Surface, WindowDim, WindowOpt};
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11 use touhou::th06::pbg3;
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12 use touhou::th06::anm0::Anm0;
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13 use touhou::th06::anm0_vm::{AnmRunner, Sprite, Vertex as FakeVertex};
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14 use touhou::util::math::{perspective, setup_camera, ortho_2d};
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15 use touhou::util::prng::Prng;
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16 use std::cell::RefCell;
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17 use std::rc::Rc;
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18 use std::env;
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19 use std::path::Path;
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20
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21 #[path = "common.rs"]
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22 mod common;
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23 use common::LoadedTexture;
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24
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25 const VS: &str = r#"
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26 in ivec3 in_position;
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27 in vec2 in_texcoord;
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28 in vec4 in_color;
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29
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30 uniform mat4 mvp;
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31
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32 out vec2 texcoord;
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33 out vec4 color;
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34
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35 void main()
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36 {
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37 gl_Position = mvp * vec4(vec3(in_position), 1.0);
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38 texcoord = vec2(in_texcoord);
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39
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40 // It’s already normalized from the u8 being passed.
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41 color = in_color;
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42 }
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43 "#;
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44
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45 const FS: &str = r#"
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46 in vec2 texcoord;
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47 in vec4 color;
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48
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49 uniform sampler2D color_map;
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50
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51 out vec4 frag_color;
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52
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53 void main()
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54 {
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55 frag_color = texture(color_map, texcoord) * color;
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56 }
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57 "#;
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58
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59 #[derive(Clone, Copy, Debug, Eq, PartialEq, Semantics)]
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60 pub enum Semantics {
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61 #[sem(name = "in_position", repr = "[i16; 3]", wrapper = "VertexPosition")]
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62 Position,
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63
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64 #[sem(name = "in_texcoord", repr = "[f32; 2]", wrapper = "VertexTexcoord")]
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65 Texcoord,
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66
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67 #[sem(name = "in_color", repr = "[u8; 4]", wrapper = "VertexColor")]
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68 Color,
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69 }
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70
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71 #[repr(C)]
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72 #[derive(Clone, Copy, Debug, PartialEq, Vertex)]
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73 #[vertex(sem = "Semantics")]
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74 struct Vertex {
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75 pos: VertexPosition,
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76 uv: VertexTexcoord,
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77 #[vertex(normalized = "true")]
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78 rgba: VertexColor,
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79 }
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80
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81 #[derive(UniformInterface)]
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82 struct ShaderInterface {
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83 // the 'static lifetime acts as “anything” here
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84 color_map: Uniform<&'static BoundTexture<'static, Flat, Dim2, NormUnsigned>>,
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85
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86 #[uniform(name = "mvp")]
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87 mvp: Uniform<[[f32; 4]; 4]>,
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88 }
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89
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90 const DEFAULT_VERTICES: [Vertex; 4] = [
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91 Vertex::new(VertexPosition::new([0, 0, 0]), VertexTexcoord::new([0., 0.]), VertexColor::new([255, 255, 255, 255])),
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92 Vertex::new(VertexPosition::new([640, 0, 0]), VertexTexcoord::new([1., 0.]), VertexColor::new([255, 255, 255, 255])),
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93 Vertex::new(VertexPosition::new([640, 480, 0]), VertexTexcoord::new([1., 1.]), VertexColor::new([255, 255, 255, 255])),
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94 Vertex::new(VertexPosition::new([0, 480, 0]), VertexTexcoord::new([0., 1.]), VertexColor::new([255, 255, 255, 255])),
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95 ];
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96
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97 fn main() {
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98 // Parse arguments.
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99 let args: Vec<_> = env::args().collect();
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100 if args.len() != 2 {
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101 eprintln!("Usage: {} <unarchived directory>", args[0]);
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102 return;
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103 }
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104 let directory = Path::new(&args[1]);
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105
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106 let in_dat = directory.join("IN.DAT");
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107 // Since GLFW can be slow to create its window, let’s decode the splash screen in another
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108 // thread in the meantime.
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109 let jpeg_thread = std::thread::spawn(|| {
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110 let mut in_pbg3 = pbg3::from_path_buffered(in_dat).expect("IN.DAT present");
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111 let jpeg = in_pbg3.get_file("th06logo.jpg", true).expect("th06logo.jpg in IN.DAT");
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112 let image = common::load_from_data(&jpeg).expect("th06logo.jpg decodable");
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113 image
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114 });
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115
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116 let mut surface = GlfwSurface::new(WindowDim::Windowed(640, 480), "Touhou", WindowOpt::default()).expect("GLFW window");
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117
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118 let image = jpeg_thread.join().expect("image loading");
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119 let tex = common::upload_texture_from_rgb_image(&mut surface, image).expect("image loading");
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120
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121 // set the uniform interface to our type so that we can read textures from the shader
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122 let program =
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123 Program::<Semantics, (), ShaderInterface>::from_strings(None, VS, None, FS).expect("program creation").ignore_warnings();
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124
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125 let mut tess = TessBuilder::new(&mut surface)
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126 .add_vertices(DEFAULT_VERTICES)
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127 .set_mode(Mode::TriangleFan)
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128 .build()
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129 .unwrap();
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130
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131 let mut back_buffer = surface.back_buffer().unwrap();
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132 let mut resize = false;
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133
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134 'app: loop {
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135 for event in surface.poll_events() {
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136 match event {
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137 WindowEvent::Close | WindowEvent::Key(Key::Escape, _, Action::Release, _) => break 'app,
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138
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139 WindowEvent::FramebufferSize(..) => {
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140 resize = true;
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141 }
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142
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143 _ => (),
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144 }
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145 }
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146
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147 if resize {
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148 back_buffer = surface.back_buffer().unwrap();
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149 resize = false;
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150 }
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151
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152 // here, we need to bind the pipeline variable; it will enable us to bind the texture to the GPU
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153 // and use it in the shader
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154 surface
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155 .pipeline_builder()
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156 .pipeline(&back_buffer, &PipelineState::default(), |pipeline, mut shd_gate| {
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157 // bind our fancy texture to the GPU: it gives us a bound texture we can use with the shader
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158 let bound_tex = match &tex {
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159 LoadedTexture::Rgb(tex) => pipeline.bind_texture(tex),
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160 LoadedTexture::Rgba(tex) => pipeline.bind_texture(tex),
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161 };
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162
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163 shd_gate.shade(&program, |iface, mut rdr_gate| {
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164 // update the texture; strictly speaking, this update doesn’t do much: it just tells the GPU
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165 // to use the texture passed as argument (no allocation or copy is performed)
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166 iface.color_map.update(&bound_tex);
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167 let mvp = ortho_2d(0., 640., 480., 0.);
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168 // TODO: check how to pass by reference.
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169 iface.mvp.update(*mvp.borrow_inner());
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170
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171 let render_state = RenderState::default()
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172 .set_blending((Equation::Additive, Factor::SrcAlpha, Factor::SrcAlphaComplement));
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173
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174 rdr_gate.render(&render_state, |mut tess_gate| {
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175 tess_gate.render(&tess);
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176 });
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177 });
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178 });
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179
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180 surface.swap_buffers();
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181 }
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182 }