wip

src/game.rs

@@ -11,7 +11,8 @@ mod camera;
 
 use assets::Assets;
 use display::init_display;
-use shaders::{Programs, Colored2dVertex};
+use shaders::{Programs, chunk::Vertex as ChunkVertex};
+use camera::Camera;
 
 pub fn run() {
     log::info!("starting up");
@@ -20,14 +21,16 @@ pub fn run() {
     let display = init_display(&event_loop);
     log::info!("compiling shaders");
     let programs = Programs::compile_all(&display);
+    log::info!("init camera");
+    let camera = Camera::default();
     log::info!("loading assets");
     let assets = Assets::load_all_sync(&display);
     log::info!("game loaded");
 
     //=======================
-    let vertex1 = Colored2dVertex { position: [-0.5, -0.5] };
-    let vertex2 = Colored2dVertex { position: [ 0.0,  0.5] };
-    let vertex3 = Colored2dVertex { position: [ 0.5, -0.25] };
+    let vertex1 = ChunkVertex { position: [-0.5, -0.5, 1.], uv: [0., 0.], normal: [0., 1., 0.] };
+    let vertex2 = ChunkVertex { position: [ 0.0,  0.5, 1.], uv: [0., 1.], normal: [0., 1., 0.] };
+    let vertex3 = ChunkVertex { position: [ 0.5, -0.25, 1.], uv: [1., 1.], normal: [0., 1., 0.] };
     let shape = vec![vertex1, vertex2, vertex3];
     let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();
     //=======================
@@ -45,8 +48,22 @@ pub fn run() {
             _ => ()
         }
         let mut target = display.draw();
+        let target_dimensions = target.get_dimensions();
+        let perspective = camera.perspective_matrix(target_dimensions);
+        let view = camera.view_matrix();
         target.clear_color_and_depth((0.5, 0.5, 1., 1.), 1.);
-        target.draw(&vertex_buffer, &glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList), &programs.colored_2d, &uniform! { u_color: [1.0f32, 0.0f32, 0.0f32, 1.0f32] }, &Default::default()).unwrap();
+        target.draw(
+            &vertex_buffer,
+            &glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList), 
+            &programs.chunk, 
+            &uniform! { 
+                model: [[0.0f32; 4]; 4],
+                view: view,
+                perspective: perspective,
+                tex: &assets.textures.block_atlas
+            }, 
+            &Default::default()
+        ).unwrap();
         target.finish().unwrap();
     });
 }

src/game/assets/textures.rs

@@ -26,7 +26,7 @@ fn load_png(file_path: &str, display: &glium::Display) -> SrgbTexture2d {
 }
 
 pub struct Textures {
-    block_atlas: SrgbTexture2d
+    pub block_atlas: SrgbTexture2d
 }
 impl Textures {
     /// Load textures synchronously, one by one and upload them to the GPU

src/game/camera.rs

@@ -1,35 +1,81 @@
+// Perspective/View matrix code from:
+// https://glium.github.io/glium/book/tuto-10-perspective.html
 // https://glium.github.io/glium/book/tuto-12-camera.html
+// I don't understand anything but it works
 
-fn view_matrix(position: &[f32; 3], direction: &[f32; 3], up: &[f32; 3]) -> [[f32; 4]; 4] {
-    let f = {
-        let f = direction;
-        let len = f[0] * f[0] + f[1] * f[1] + f[2] * f[2];
-        let len = len.sqrt();
-        [f[0] / len, f[1] / len, f[2] / len]
-    };
+use std::f32::consts::PI;
 
-    let s = [up[1] * f[2] - up[2] * f[1],
-             up[2] * f[0] - up[0] * f[2],
-             up[0] * f[1] - up[1] * f[0]];
-
-    let s_norm = {
-        let len = s[0] * s[0] + s[1] * s[1] + s[2] * s[2];
-        let len = len.sqrt();
-        [s[0] / len, s[1] / len, s[2] / len]
-    };
-
-    let u = [f[1] * s_norm[2] - f[2] * s_norm[1],
-             f[2] * s_norm[0] - f[0] * s_norm[2],
-             f[0] * s_norm[1] - f[1] * s_norm[0]];
-
-    let p = [-position[0] * s_norm[0] - position[1] * s_norm[1] - position[2] * s_norm[2],
-             -position[0] * u[0] - position[1] * u[1] - position[2] * u[2],
-             -position[0] * f[0] - position[1] * f[1] - position[2] * f[2]];
-
-    [
-        [s_norm[0], u[0], f[0], 0.0],
-        [s_norm[1], u[1], f[1], 0.0],
-        [s_norm[2], u[2], f[2], 0.0],
-        [p[0], p[1], p[2], 1.0],
-    ]
+pub struct Camera {
+    pub position: [f32; 3],
+    pub direction: [f32; 3],
+    pub up: [f32; 3],
+    pub fov: f32,
+    pub znear: f32,
+    pub zfar: f32,
+}
+impl Camera {
+    pub fn new() -> Self {
+        Default::default()
+    }
+
+    pub fn view_matrix(&self) -> [[f32; 4]; 4] {
+        let position = self.position;
+        let direction = self.direction;
+        let up = self.up;
+
+        let f = {
+            let f = direction;
+            let len = f[0] * f[0] + f[1] * f[1] + f[2] * f[2];
+            let len = len.sqrt();
+            [f[0] / len, f[1] / len, f[2] / len]
+        };
+        let s = [up[1] * f[2] - up[2] * f[1],
+                 up[2] * f[0] - up[0] * f[2],
+                 up[0] * f[1] - up[1] * f[0]];
+        let s_norm = {
+            let len = s[0] * s[0] + s[1] * s[1] + s[2] * s[2];
+            let len = len.sqrt();
+            [s[0] / len, s[1] / len, s[2] / len]
+        };
+        let u = [f[1] * s_norm[2] - f[2] * s_norm[1],
+                 f[2] * s_norm[0] - f[0] * s_norm[2],
+                 f[0] * s_norm[1] - f[1] * s_norm[0]];
+        let p = [-position[0] * s_norm[0] - position[1] * s_norm[1] - position[2] * s_norm[2],
+                 -position[0] * u[0] - position[1] * u[1] - position[2] * u[2],
+                 -position[0] * f[0] - position[1] * f[1] - position[2] * f[2]];
+        [
+            [s_norm[0], u[0], f[0], 0.0],
+            [s_norm[1], u[1], f[1], 0.0],
+            [s_norm[2], u[2], f[2], 0.0],
+            [p[0], p[1], p[2], 1.0],
+        ]
+    }
+    
+    pub fn perspective_matrix(&self, target_dimensions: (u32, u32)) -> [[f32; 4]; 4] {
+        let znear = self.znear;
+        let zfar = self.zfar;
+        let fov = self.fov;
+        let (width, height) = target_dimensions;
+        let aspect_ratio = height as f32 / width as f32;
+        let f = 1.0 / (fov / 2.0).tan();
+        [
+            [f *   aspect_ratio   ,    0.0,              0.0              ,   0.0],
+            [         0.0         ,     f ,              0.0              ,   0.0],
+            [         0.0         ,    0.0,  (zfar+znear)/(zfar-znear)    ,   1.0],
+            [         0.0         ,    0.0, -(2.0*zfar*znear)/(zfar-znear),   0.0],
+        ]
+    }    
+}
+
+impl Default for Camera {
+    fn default() -> Self {
+        Self {
+            position: [0., 0., 0.],
+            direction: [0., 0., 0.],
+            up: [0., 1., 0.],
+            fov: PI / 3.,
+            zfar: 1024.,
+            znear: 0.1,
+        }
+    }
 }

src/game/shaders.rs

@@ -1,61 +1,17 @@
-use glium::{Display, Program, implement_vertex};
+use glium::{Display, Program};
+
+pub mod chunk;
+pub mod colored2d;
 
 pub struct Programs {
     pub colored_2d: Program,
+    pub chunk: Program,
 }
 impl Programs {
     pub fn compile_all(display: &Display) -> Self {
         Self {
-            colored_2d: Program::from_source(display, COLORED_2D_VERTEX_SHADER, COLORED_2D_FRAGMENT_SHADER, None).unwrap(),
+            colored_2d: Program::from_source(display, colored2d::VERTEX_SHADER, colored2d::FRAGMENT_SHADER, None).unwrap(),
+            chunk: Program::from_source(display, chunk::VERTEX_SHADER, chunk::FRAGMENT_SHADER, None).unwrap(),
         }
     }
 }
-
-#[derive(Clone, Copy)]
-pub struct Colored2dVertex {
-    pub position: [f32; 2]
-}
-implement_vertex!(Colored2dVertex, position);
-
-pub const COLORED_2D_VERTEX_SHADER: &str = r#"
-    #version 140
-
-    in vec2 position;
-
-    void main() {
-        gl_Position = vec4(position, 0., 1.);
-    }
-"#;
-pub const COLORED_2D_FRAGMENT_SHADER: &str = r#"
-    #version 140
-
-    out vec4 color;
-    uniform vec4 u_color;
-
-    void main() {
-        color = u_color;
-    }
-"#;
-
-//TODO store vertex data in a more compact way
-pub const CHUNK_VERTEX_SHADER: &str = r#"
-    #version 150
-
-    in vec3 position;
-    in vec3 normal;
-
-    out vec3 v_normal;
-
-    uniform mat4 perspective;
-    uniform mat4 view;
-    uniform mat4 model;
-
-    void main() {
-        mat4 modelview = view * model;
-        v_normal = transpose(inverse(mat3(modelview))) * normal;
-        gl_Position = perspective * modelview * vec4(position, 1.0);
-    }
-"#;
-pub const CHUNK_FRAGMENT_SHADER: &str = r#"
-    #version 150
-"#;

src/game/shaders/chunk.rs

@@ -0,0 +1,41 @@
+use glium::implement_vertex;
+
+#[derive(Clone, Copy)]
+pub struct Vertex {
+    pub position: [f32; 3],
+    pub normal: [f32; 3],
+    pub uv: [f32; 2],
+}
+implement_vertex!(Vertex, position, normal, uv);
+
+//TODO store vertex data in a more compact way
+pub const VERTEX_SHADER: &str = r#"
+    #version 150
+
+    in vec3 position;
+    in vec3 normal;
+    in vec2 uv;
+    out vec3 v_normal;
+    out vec2 v_uv;
+    uniform mat4 perspective;
+    uniform mat4 view;
+    uniform mat4 model;
+
+    void main() {
+        mat4 modelview = view * model;
+        v_normal = transpose(inverse(mat3(modelview))) * normal;
+        v_uv = uv;
+        gl_Position = perspective * modelview * vec4(position, 1.0);
+    }
+"#;
+pub const FRAGMENT_SHADER: &str = r#"
+    #version 150
+
+    in vec2 v_uv;
+    out vec4 color;
+    uniform sampler2D tex;
+
+    void main() {
+        color = texture(tex, v_uv);
+    }
+"#;

src/game/shaders/colored2d.rs

@@ -0,0 +1,27 @@
+use glium::{Display, Program, implement_vertex};
+
+#[derive(Clone, Copy)]
+pub struct Vertex {
+    pub position: [f32; 2]
+}
+implement_vertex!(Vertex, position);
+
+pub const VERTEX_SHADER: &str = r#"
+    #version 140
+
+    in vec2 position;
+
+    void main() {
+        gl_Position = vec4(position, 0., 1.);
+    }
+"#;
+pub const FRAGMENT_SHADER: &str = r#"
+    #version 140
+
+    out vec4 color;
+    uniform vec4 u_color;
+
+    void main() {
+        color = u_color;
+    }
+"#;