some stuff related to touch controls

Cargo.toml

@@ -44,7 +44,7 @@ bitflags = "1"
 bitvec = "0.17.4"
 byteorder = "1.3"
 case_insensitive_hashmap = "1.0.0"
-cpal = {git = "https://github.com/alula/cpal.git", branch = "android-support"}
+cpal = {git = "https://github.com/doukutsu-rs/cpal.git", branch = "android-support"}
 directories = "2"
 gfx = "0.18"
 gfx_core = "0.9"

src/lib.rs

@@ -22,7 +22,7 @@ use winit::event::{ElementState, Event, KeyboardInput, WindowEvent, TouchPhase};
 use winit::event_loop::ControlFlow;
 
 use crate::builtin_fs::BuiltinFS;
-use crate::ggez::{Context, ContextBuilder, filesystem, GameResult};
+use crate::ggez::{Context, ContextBuilder, filesystem, GameResult, GameError};
 use crate::ggez::conf::{Backend, WindowMode, WindowSetup};
 use crate::ggez::event::{KeyCode, KeyMods};
 use crate::ggez::graphics;
@@ -34,7 +34,6 @@ use crate::scene::loading_scene::LoadingScene;
 use crate::scene::Scene;
 use crate::shared_game_state::{SharedGameState, TimingMode};
 use crate::ui::UI;
-use crate::ggez::event::winit_event::ModifiersState;
 
 mod bmfont;
 mod bmfont_renderer;
@@ -64,6 +63,7 @@ mod stage;
 mod sound;
 mod text_script;
 mod texture_set;
+mod touch_controls;
 mod ui;
 mod weapon;
 
@@ -128,6 +128,9 @@ impl Game {
 
         if let Some(scene) = self.scene.as_mut() {
             scene.draw(&mut self.state, ctx)?;
+            if self.state.settings.touch_controls {
+                self.state.touch_controls.draw(&self.state.constants, &mut self.state.texture_set, ctx)?;
+            }
 
             graphics::set_transform(ctx, self.def_matrix);
             graphics::apply_transformations(ctx)?;
@@ -234,27 +237,34 @@ pub fn android_main() {
     init().unwrap();
 }
 
-fn init_ctx<P: Into<path::PathBuf>>(event_loop: &winit::event_loop::EventLoopWindowTarget<()>, resource_dir: P) -> GameResult<Context> {
-    let backend = if cfg!(target_os = "android") {
-        Backend::OpenGLES { major: 2, minor: 0 }
-    } else {
-        Backend::OpenGL { major: 3, minor: 2 }
-    };
+static BACKENDS: [Backend; 4] = [
+    Backend::OpenGL {major: 3, minor: 2},
+    Backend::OpenGLES { major: 3, minor: 2},
+    Backend::OpenGLES { major: 3, minor: 0},
+    Backend::OpenGLES { major: 2, minor: 0}
+];
 
-    let mut ctx = ContextBuilder::new("doukutsu-rs")
-        .window_setup(WindowSetup::default().title("Cave Story (doukutsu-rs)"))
-        .window_mode(WindowMode::default()
-            .resizable(true)
-            .min_dimensions(320.0, 240.0)
-            .dimensions(854.0, 480.0))
-        .add_resource_path(resource_dir)
-        .add_resource_path(path::PathBuf::from(str!("./")))
-        .backend(backend)
-        .build(event_loop)?;
+fn init_ctx<P: Into<path::PathBuf> + Clone>(event_loop: &winit::event_loop::EventLoopWindowTarget<()>, resource_dir: P) -> GameResult<Context> {
+    for backend in BACKENDS.iter() {
+        let mut ctx = ContextBuilder::new("doukutsu-rs")
+            .window_setup(WindowSetup::default().title("Cave Story (doukutsu-rs)"))
+            .window_mode(WindowMode::default()
+                .resizable(true)
+                .min_dimensions(320.0, 240.0)
+                .dimensions(854.0, 480.0))
+            .add_resource_path(resource_dir.clone())
+            .add_resource_path(path::PathBuf::from(str!("./")))
+            .backend(*backend)
+            .build(event_loop);
 
-    ctx.filesystem.mount_vfs(Box::new(BuiltinFS::new()));
+        if let Ok(mut ctx) = ctx {
+            ctx.filesystem.mount_vfs(Box::new(BuiltinFS::new()));
 
-    Ok(ctx)
+            return Ok(ctx);
+        }
+    }
+
+    Err(GameError::EventLoopError("Failed to initialize OpenGL backend. Perhaps the driver is outdated?".to_string()))
 }
 
 pub fn init() -> GameResult {
@@ -345,7 +355,7 @@ pub fn init() -> GameResult {
                     }
                     WindowEvent::Touch(touch) => {
                         if let Some(game) = &mut game {
-
+                            game.state.touch_controls.process_winit_event(game.state.scale, &mut game.state.key_state, touch);
                         }
                     }
                     WindowEvent::KeyboardInput {
@@ -405,5 +415,5 @@ pub fn init() -> GameResult {
             }
             _ => {}
         }
-    });
+    })
 }

src/shared_game_state.rs

@@ -19,6 +19,7 @@ use crate::str;
 use crate::text_script::{TextScriptExecutionState, TextScriptVM, ScriptMode};
 use crate::texture_set::TextureSet;
 use crate::ggez::graphics::Canvas;
+use crate::touch_controls::TouchControls;
 
 #[derive(PartialEq, Eq, Copy, Clone)]
 pub enum TimingMode {
@@ -43,6 +44,7 @@ pub struct Settings {
     pub original_textures: bool,
     pub enhanced_graphics: bool,
     pub debug_outlines: bool,
+    pub touch_controls: bool,
 }
 
 pub struct SharedGameState {
@@ -57,6 +59,7 @@ pub struct SharedGameState {
     pub carets: Vec<Caret>,
     pub key_state: KeyState,
     pub key_trigger: KeyState,
+    pub touch_controls: TouchControls,
     pub font: BMFontRenderer,
     pub texture_set: TextureSet,
     pub base_path: String,
@@ -115,6 +118,7 @@ impl SharedGameState {
             carets: Vec::with_capacity(32),
             key_state: KeyState(0),
             key_trigger: KeyState(0),
+            touch_controls: TouchControls::new(),
             font,
             texture_set: TextureSet::new(base_path),
             base_path: str!(base_path),
@@ -127,6 +131,7 @@ impl SharedGameState {
                 original_textures: false,
                 enhanced_graphics: true,
                 debug_outlines: false,
+                touch_controls: cfg!(target_os = "android")
             },
             constants,
             new_npcs: Vec::with_capacity(8),

src/touch_controls.rs

@@ -0,0 +1,55 @@
+use winit::event::TouchPhase;
+use crate::texture_set::TextureSet;
+use crate::ggez::{Context, GameResult};
+use crate::common::{KeyState, Rect};
+use crate::engine_constants::EngineConstants;
+
+struct TouchPoint {
+    id: u64,
+    position: (f64, f64),
+    last_position: (f64, f64),
+}
+
+pub struct TouchControls {
+    points: Vec<TouchPoint>,
+}
+
+impl TouchControls {
+    pub fn new() -> TouchControls {
+        TouchControls {
+            points: Vec::with_capacity(8),
+        }
+    }
+    
+    pub fn process_winit_event(&mut self, scale: f32, key_state: &mut KeyState, touch: winit::event::Touch) {
+        match touch.phase {
+            TouchPhase::Started | TouchPhase::Moved => {
+                if let Some(point) = self.points.iter_mut().find(|p| p.id == touch.id) {
+                    point.last_position = point.position;
+                    point.position = (touch.location.x, touch.location.y);
+                } else {
+                    self.points.push(TouchPoint {
+                        id: touch.id,
+                        position: (touch.location.x, touch.location.y),
+                        last_position: (0.0, 0.0)
+                    });
+                }
+            }
+            TouchPhase::Ended | TouchPhase::Cancelled => {
+                self.points.retain(|p| p.id != touch.id);
+            }
+        }
+    }
+
+    pub fn draw(&self, constants: &EngineConstants, texture_set: &mut TextureSet, ctx: &mut Context) -> GameResult {
+        let batch = texture_set.get_or_load_batch(ctx, constants, "Caret")?;
+        let rect = Rect::new_size(104, 120, 24, 24);
+        for point in self.points.iter() {
+            batch.add_rect(point.position.0 as f32 - 12.0, point.position.1 as f32 - 12.0, &rect);
+        }
+
+        batch.draw(ctx)?;
+
+        Ok(())
+    }
+}