Work on getting rendering context set up

2 files changed, 53 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 10e7850..f0b0ccb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,9 @@
 mod quad;
 mod ctx;
 mod step;
+mod render;
 
 fn main() {
-    println!("Hello, world!");
+    println!("Warming up...");
+    render::run();
 }
diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..8389ab9
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,50 @@
+use std::io;
+use std::io::Write;
+
+use vulkano as vk;
+use vk::instance::{Instance, InstanceExtensions, PhysicalDevice};
+
+/// Reads a single line after prompting the player.
+pub fn read(prompt: &str) -> String {
+    print!("{}", prompt);
+    io::stdout().flush().expect("unable to prompt user");
+
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("unable to read user input");
+
+    return input.trim().to_string();
+}
+
+pub fn select_device(instance: &Instance) -> Option<device> {
+    // get all the devices
+    let devices = PhysicalDevice::enumerate(&instance).to_vec();
+
+    // easy choice
+    if devices.is_empty() {
+        println!("No devices detected >:(");
+        return None;
+    } else if devices.len() == 1 {
+        println!("Using only device present");
+        return Some(devices[1]);
+    }
+
+    // leave the choice up to the user
+    println!("Detected the following devices:");
+    for (i, device) in devices.iter().enumerate() {
+        println!("({}) {}", i, device);
+    }
+
+    // not really forgiving haha
+    let number = usize::from(read("Which device would you like to use: "));
+    let device = devices.get(number);
+    device
+}
+
+pub fn run() {
+    let instance = Instance::new(None, &InstanceExtensions::none(), None)
+        .expect("failed to create instance");
+
+    let device = select_device(&instance);
+}