simplification

assets/shaders/teapot/teapot.frag

@@ -1,9 +1,13 @@
 #version 140
 
+in vec3 v_normal;
 out vec4 color;
+uniform vec3 u_light;
 
 void main() {
-    color = vec4(1.0, 0.0, 0.0, 1.0);
+    float brightness = dot(normalize(v_normal), normalize(u_light));
+    vec3 dark_color = vec3(0.6, 0.0, 0.0);
+    vec3 regular_color = vec3(1.0, 0.0, 0.0);
+    color = vec4(mix(dark_color, regular_color, brightness), 1.0);
 }
 
-

assets/shaders/teapot/teapot.vert

@@ -1,10 +1,13 @@
-#version 140
+#version 150
 
 in vec3 position;
 in vec3 normal;
 
+out vec3 v_normal;
+
 uniform mat4 matrix;
 
 void main() {
+    v_normal = transpose(inverse(mat3(matrix))) * normal;
     gl_Position = matrix * vec4(position, 1.0);
-}
+}

src/main.rs

@@ -1,6 +1,6 @@
 #![feature(const_fn_trait_bound)]
 
-use std::{collections::HashMap, io::Cursor};
+use std::collections::HashMap;
 
 #[macro_use]
 extern crate glium;
@@ -20,60 +20,19 @@ fn main() {
         .with_title("Voxel Engine")
         .with_resizable(true)
         .with_transparent(true);
-    let cb = glutin::ContextBuilder::new();
+    let cb = glutin::ContextBuilder::new().with_depth_buffer(24);
+
     let display = glium::Display::new(wb, cb, &event_loop).unwrap();
 
-    let image = image::load(
+    // let mut shaders = HashMap::new();
-        Cursor::new(&include_bytes!("../assets/GrassTop.png")),
-        image::ImageFormat::Png,
-    )
-    .unwrap()
-    .to_rgba8();
-    let image_dimensions = image.dimensions();
-    let image =
-        glium::texture::RawImage2d::from_raw_rgba_reversed(&image.into_raw(), image_dimensions);
-    let texture = glium::texture::SrgbTexture2d::new(&display, image).unwrap();
 
-    #[derive(Copy, Clone)]
+    let vertex_shader_src = include_str!("../assets/shaders/teapot/teapot.vert");
-    struct Vertex {
+    let fragment_shader_src = include_str!("../assets/shaders/teapot/teapot.frag");
-        position: [f32; 2],
-        tex_coords: [f32; 2],
-        light_color: [f32; 4],
-    }
-
-    implement_vertex!(Vertex, position, tex_coords, light_color);
-
-    let vertex1 = Vertex {
-        position: [-0.5, -0.5],
-        tex_coords: [0.0, 0.0],
-        light_color: [1.0, 1.0, 1.0, 0.0],
-    };
-
-    let vertex2 = Vertex {
-        position: [0.0, 0.5],
-        tex_coords: [0.0, 1.0],
-        light_color: [1.0, 0.0, 0.0, 1.0],
-    };
-
-    let vertex3 = Vertex {
-        position: [0.5, -0.25],
-        tex_coords: [1.0, 0.0],
-        light_color: [0.0, 1.0, 0.0, 0.5],
-    };
-
-    let shape = vec![vertex1, vertex2, vertex3];
-
-    let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();
-    let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
-
-    let vertex_shader_src = include_str!("../assets/shade.vert");
-    let fragment_shader_src = include_str!("../assets/shade.frag");
 
     let program =
         glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None)
             .unwrap();
 
-    let mut t: f32 = -0.5;
     event_loop.run(move |event, _, control_flow| {
         use glutin::event::Event::*;
         match event {
@@ -127,45 +86,12 @@ fn main() {
             std::time::Instant::now() + std::time::Duration::from_nanos(16_666_667);
         *control_flow = glutin::event_loop::ControlFlow::WaitUntil(next_frame_time);
 
-        // we update `t`
-        t += 0.0002;
-        if t > 0.5 {
-            t = -0.5;
-        }
-
         let mut target = display.draw();
-        target.clear_color(0.0, 0.0, 1.0, 1.0);
 
-        {
+        target.clear_color_and_depth((0.0, 0.0, 1.0, 1.0), 1.0);
-            // draw the triangle
-            let uniforms = uniform! {
-                matrix: [
-                    [1.0, 0.0, 0.0, 0.0],
-                    [0.0, 1.0, 0.0, 0.0],
-                    [0.0, 0.0, 1.0, 0.0],
-                    [ t , 0.0, 0.0, 1.0f32],
-                ],
-                tex: &texture,
-            };
 
-            target
-                .draw(
-                    &vertex_buffer,
-                    &indices,
-                    &program,
-                    &uniforms,
-                    &Default::default(),
-                )
-                .unwrap();
-        }
         {
             // Teapot stage
-            let vertex_shader_src = include_str!("../assets/shaders/teapot/teapot.vert");
-            let fragment_shader_src = include_str!("../assets/shaders/teapot/teapot.frag");
-
-            let program =
-                glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None)
-                    .unwrap();
 
             let positions = glium::VertexBuffer::new(&display, &teapot::VERTICES).unwrap();
             let normals = glium::VertexBuffer::new(&display, &teapot::NORMALS).unwrap();
@@ -183,17 +109,31 @@ fn main() {
                 [0.0, 0.0, 0.0, 1.0f32],
             ];
 
+            let light = [-1.0, 0.4, 0.9f32];
+
+            let params = glium::DrawParameters {
+                depth: glium::Depth {
+                    test: glium::draw_parameters::DepthTest::IfLess,
+                    write: true,
+                    ..Default::default()
+                },
+                ..Default::default()
+            };
+
             target
                 .draw(
                     (&positions, &normals),
                     &indices,
                     &program,
-                    &uniform! { matrix: matrix },
+                    &uniform! { matrix: matrix, u_light: light },
-                    &Default::default(),
+                    &params,
                 )
                 .unwrap();
         }
 
+        { // Water Stage
+        }
+
         target.finish().unwrap();
     });
 }