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extern crate exuberantbovines;
extern crate getopts;
#[macro_use]
extern crate glium;
use exuberantbovines::{generic_main, util};
use getopts::Options;
use glium::glutin::os::unix::WindowBuilderExt;
mod cow_model;
fn run(window_id: Option<u64>) {
use glium::{DisplayBuild, Surface};
let mut t: f32 = 0.0;
let mut z: f32;
let win_builder: glium::glutin::WindowBuilder = match window_id {
Some(id) =>
glium::glutin::WindowBuilder::new()
.from_existing_window(id),
None => glium::glutin::WindowBuilder::new()
.with_title(format!("Exuberant Cow!"))
.with_depth_buffer(24),
};
let display = win_builder.build_glium().unwrap();
let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
let face_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_FACE_VERTICES).unwrap();
let hide_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_HIDE_VERTICES).unwrap();
let hoofs_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_HOOFS_VERTICES).unwrap();
let horns_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_HORNS_VERTICES).unwrap();
let tail_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_TAIL_VERTICES).unwrap();
let udder_vertices = glium::VertexBuffer::new(
&display, &cow_model::COW_UDDER_VERTICES).unwrap();
let vertex_shader_src = r#"
#version 140
uniform mat4 perspective;
uniform mat4 view;
uniform mat4 model;
in vec3 position;
in vec3 normal;
out vec3 v_normal;
out vec3 v_position;
void main() {
mat4 modelview = view * model;
v_normal = transpose(inverse(mat3(modelview))) * normal;
gl_Position = perspective * modelview * vec4(position, 1.0);
v_position = gl_Position.xyz / gl_Position.w;
}
"#;
let fragment_shader_src = r#"
#version 140
uniform vec3 u_light;
in vec3 v_normal;
in vec3 v_position;
out vec4 color;
const vec3 ambient_color = vec3(0.63, 0.43, 0.36);
const vec3 diffuse_color = vec3(0.5, 0.5, 0.5);
const vec3 specular_color = vec3(0.0, 0.0, 0.0);
void main() {
float diffuse = max(dot(normalize(v_normal), normalize(u_light)), 0.0);
vec3 camera_dir = normalize(-v_position);
vec3 half_direction = normalize(normalize(u_light) + camera_dir);
float specular = pow(max(dot(half_direction, normalize(v_normal)), 0.0), 16.);
color = vec4(ambient_color +
diffuse * diffuse_color +
specular * specular_color, 1.0);
}
"#;
let program = glium::Program::from_source(
&display,
vertex_shader_src,
fragment_shader_src,
None).unwrap();
loop {
t += 0.03;
z = 0.5 * t.sin();
// Drawing Pipeline
let mut target = display.draw();
let (width, height) = target.get_dimensions();
let aspect_ratio = height as f32 / width as f32;
// Calculate Perspective Matrix
let fov: f32 = 3.141592 / 3.0; // 120 deg
let zfar = 1024.0;
let znear = 0.1;
let f = 1.0 / (fov / 2.0).tan();
let perspective = [
[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],
];
let light = [-1.0, 0.4, 0.9f32];
let view = util::view_matrix(&[2.0, -1.0, 1.0], &[-2.0, 1.0, 1.0], &[0.0, 1.0, 0.0]);
let uniforms = uniform! {
model: [
[ 0.3, 0.0, 0.0, 0.0 ],
[ 0.0, 0.3, 0.0, 0.0 ],
[ 0.0, 0.0, 0.3, 0.0 ],
[-0.5, z, 2.0, 1.0 ]],
u_light: light,
perspective: perspective,
view: view,
};
// Set black background
target.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
let params = glium::DrawParameters {
depth: glium::Depth {
test: glium::draw_parameters::DepthTest::IfLess,
write: true,
.. Default::default()
},
// NB: would enable if all models were "closed" ("sealed", no gaps)
backface_culling: glium::draw_parameters::BackfaceCullingMode::CullCounterClockwise,
.. Default::default()
};
for part_vertices in vec![&face_vertices,
&hide_vertices,
&hoofs_vertices,
&horns_vertices,
&tail_vertices,
&udder_vertices] {
target.draw(part_vertices,
&indices,
&program,
&uniforms,
¶ms).unwrap();
}
target.finish().unwrap();
for ev in display.poll_events() {
match ev {
glium::glutin::Event::Closed => return,
_ => ()
}
}
// XXX: sleep here for 10ms
}
}
fn main() {
let mut opts = Options::new();
opts.optflag("", "wire", "wireframe mode (IGNORED)");
opts.optopt("c", "count", "how many cows? (1 to 9) (IGNORED)", "NUM");
opts.optopt("", "delay", "inter-frame delay (0 to 100000) (IGNORED)", "NUM");
opts.optopt("s", "speed", "how fast? ratio, with 1.0 as normal (IGNORED)", "NUM");
let (_, window_id) = generic_main(opts);
run(window_id)
}
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