Add simple fps benchmark

Former-commit-id: d4bb368fa0b5ab98819aa509f799e96a4da58308

Cargo.lock

@@ -461,6 +461,13 @@ dependencies = [
  "yansi 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "fps_bench"
+version = "0.1.0"
+dependencies = [
+ "rustboyadvance-core 0.1.0",
+]
+
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"

Cargo.toml

@@ -4,6 +4,7 @@ members = [
     "platform/rustboyadvance-sdl2",
     "platform/rustboyadvance-minifb",
     "bindings/rustboyadvance-jni",
+    "fps_bench"
 ]
 
 [profile.dev]

fps_bench/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "fps_bench"
+version = "0.1.0"
+authors = ["Michel Heily <michelheily@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+rustboyadvance-core = {path = "../rustboyadvance-core/"}

fps_bench/src/main.rs

@@ -0,0 +1,58 @@
+use std::cell::RefCell;
+use std::env;
+use std::path::Path;
+use std::rc::Rc;
+
+use rustboyadvance_core::prelude::*;
+use rustboyadvance_core::util::FpsCounter;
+
+struct BenchmarkHardware {}
+
+impl BenchmarkHardware {
+    fn new() -> BenchmarkHardware {
+        BenchmarkHardware {}
+    }
+}
+
+impl VideoInterface for BenchmarkHardware {}
+impl AudioInterface for BenchmarkHardware {}
+impl InputInterface for BenchmarkHardware {}
+
+fn main() {
+    if env::args().count() < 3 {
+        eprintln!("usage: {} <bios> <rom>", env::args().nth(0).unwrap());
+        return;
+    }
+
+    let bios_path = env::args().nth(1).expect("missing <bios>");
+    let rom_path = env::args().nth(2).expect("missing <rom>");
+
+    let bios = read_bin_file(Path::new(&bios_path)).expect("failed to read bios file");
+    let rom = read_bin_file(Path::new(&rom_path)).expect("failed to read rom file");
+
+    let gamepak = GamepakBuilder::new()
+        .take_buffer(rom.into_boxed_slice())
+        .with_sram()
+        .without_backup_to_file()
+        .build()
+        .unwrap();
+
+    let dummy = Rc::new(RefCell::new(BenchmarkHardware::new()));
+
+    let mut gba = GameBoyAdvance::new(
+        bios.into_boxed_slice(),
+        gamepak,
+        dummy.clone(),
+        dummy.clone(),
+        dummy.clone(),
+    );
+    gba.skip_bios();
+
+    let mut fps_counter = FpsCounter::default();
+    loop {
+        gba.frame();
+        if let Some(fps) = fps_counter.tick() {
+            println!("FPS: {}", fps);
+        }
+    }
+}