Display multiple instances of OBJs

Cargo.toml

@@ -7,4 +7,5 @@ edition = "2021"
 glium = "0.32.1"
 image = "0.24.4"
 glutin = "0.29.1"
+obj = "0.10.2"
 load_file = "1.0.1"

src/main.rs

@@ -13,6 +13,12 @@ use glium::{glutin, Surface};
 
 mod support;
 
+#[derive(Copy, Clone, Debug)]
+struct PerInstance {
+    pub w_position: (f32, f32, f32),
+}
+implement_vertex!(PerInstance, w_position);
+
 const BIOMES_NUMBER: usize = 19;
 const BIOMES: [&str; BIOMES_NUMBER] = [
     "dirt",
@@ -46,7 +52,7 @@ fn main() {
     let display = glium::Display::new(wb, cb, &event_loop).unwrap();
 
     // building the vertex and index buffers
-    let vertex_buffer = support::load_ground(&display);
+    let ground_vertex_buffer = support::load_ground(&display);
 
     let textures: [SrgbTexture2d; BIOMES_NUMBER] = BIOMES.map(|biome| {
         println!("{}", biome);
@@ -113,7 +119,7 @@ fn main() {
     );
 
     // the program
-    let program = program!(&display,
+    let ground_program = program!(&display,
         140 => {
             vertex: "
                 #version 140
@@ -175,12 +181,51 @@ fn main() {
 
     let mut camera = support::camera::CameraState::new();
 
+    let vertex_buffer = support::load_wavefront(&display, &load_bytes!("../Extensions/LemnosLife/Map/Common/Structures/24.obj"));
+
+    let structures_program = program!(&display,
+        140 => {
+            vertex: "
+                #version 140
+
+                uniform mat4 persp_matrix;
+                uniform mat4 view_matrix;
+
+                in vec3 w_position;
+                in vec3 position;
+
+                void main() {
+                    gl_Position = persp_matrix * view_matrix * vec4(position + w_position, 1.0);
+                }
+            ",
+
+            fragment: "
+                #version 140
+
+                out vec4 f_color;
+
+                void main() {
+                    f_color = vec4(1.0, 1.0, 1.0, 1.0);
+                }
+            ",
+        },
+    ).unwrap();
+
+    let per_instance = vec![
+        PerInstance {
+            w_position: (0.0, 0.0, 0.0),
+        },
+        PerInstance {
+            w_position: (1.0, 0.0, 0.0),
+        },
+    ];
+
     // the main loop
     support::start_loop(event_loop, move |events| {
         camera.update();
 
         // building the uniforms
-        let uniforms = uniform! {
+        let ground_uniforms = uniform! {
             persp_matrix: camera.get_perspective(),
             view_matrix: camera.get_view(),
             tex0: &textures[0],
@@ -204,6 +249,11 @@ fn main() {
             tex18: &textures[18],
         };
 
+        let structures_uniforms = uniform! {
+            persp_matrix: camera.get_perspective(),
+            view_matrix: camera.get_view(),
+        };
+
         // draw parameters
         let params = glium::DrawParameters {
             depth: glium::Depth {
@@ -216,19 +266,33 @@ fn main() {
             ..Default::default()
         };
 
+        let per_instance_buffer =
+            glium::vertex::VertexBuffer::new(&display, &per_instance).unwrap();
+
         // drawing a frame
         let start = Instant::now();
         let mut target = display.draw();
         target.clear_color_and_depth((0.0, 0.0, 0.0, 0.0), 1.0);
         target
             .draw(
-                &vertex_buffer,
+                &ground_vertex_buffer,
                 &glium::index::NoIndices(glium::index::PrimitiveType::TriangleStrip),
-                &program,
-                &uniforms,
+                &ground_program,
+                &ground_uniforms,
                 &params,
             )
             .unwrap();
+
+        target
+            .draw(
+                (&vertex_buffer, per_instance_buffer.per_instance().unwrap()),
+                &glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList),
+                &structures_program,
+                &structures_uniforms,
+                &params,
+            )
+            .unwrap();
+
         target.finish().unwrap();
         let duration = start.elapsed();
         println!("Time elapsed is: {:?}", duration);

src/support/camera.rs

@@ -13,14 +13,15 @@ pub struct CameraState {
     rotate_right: bool,
 }
 
-const SPEED: f32 = 100.0; //1.0;
+const SPEED: f32 = 1.0; //1.0;
 
 impl CameraState {
     pub fn new() -> CameraState {
         CameraState {
             aspect_ratio: 1_024.0 / 768.0,
             // The second coordinate is for the altitude.
-            position: (3_646.41, 12.3622, 13_113.7),
+            //position: (3_646.41, 12.3622, 13_113.7),
+            position: (0.0, 0.0, 0.0),
             direction: (0.0, 0.0, -1.0),
             moving_up: false,
             moving_left: false,
@@ -36,7 +37,7 @@ impl CameraState {
     pub fn get_perspective(&self) -> [[f32; 4]; 4] {
         let fov: f32 = std::f32::consts::PI / 2.0;
         let zfar = 53_209.0;
-        let znear = 1.0; //0.01;
+        let znear = 0.01;
 
         let f = 1.0 / (fov / 2.0).tan();
 

src/support/mod.rs

@@ -196,3 +196,54 @@ pub fn load_ground(display: &Display) -> VertexBufferAny {
         .unwrap()
         .into()
 }
+
+pub fn load_wavefront(display: &Display, data: &[u8]) -> VertexBufferAny {
+    #[derive(Copy, Clone)]
+    struct Vertex {
+        position: [f32; 3],
+        texture: [f32; 2],
+    }
+
+    implement_vertex!(Vertex, position, texture);
+
+    let mut data = ::std::io::BufReader::new(data);
+    let data = obj::ObjData::load_buf(&mut data).unwrap();
+
+    let mut vertex_data = Vec::new();
+
+    for object in data.objects.iter() {
+        for polygon in object.groups.iter().flat_map(|g| g.polys.iter()) {
+            match polygon {
+                obj::SimplePolygon(indices) => {
+                    for i in 0..=2 {
+                        let v = indices[i];
+                        let position = data.position[v.0];
+                        let texture = v.1.map(|index| data.texture[index]);
+
+                        let texture = texture.unwrap_or([0.0, 0.0]);
+
+                        vertex_data.push(Vertex {
+                            position,
+                            texture,
+                        })
+                    }
+                    for i in [0, 2, 3] {
+                        let v = indices[i];
+                        let position = data.position[v.0];
+                        let texture = v.1.map(|index| data.texture[index]);
+
+                        let texture = texture.unwrap_or([0.0, 0.0]);
+
+                        vertex_data.push(Vertex {
+                            position,
+                            texture,
+                        })
+                    }
+                },
+            }
+        }
+    }
+    glium::vertex::VertexBuffer::new(display, &vertex_data)
+        .unwrap()
+        .into()
+}