From 9545f056ab780cffa12093b609db4b621d16241d Mon Sep 17 00:00:00 2001
From: Daan Vanden Bosch <daan.v.d.bosch@gmail.com>
Date: Tue, 5 Nov 2019 21:07:17 +0100
Subject: [PATCH] Added QuestRunner for managing game state, orchestrating the
 VM and controlling the visual aspects of a virtual quest run.

---
 src/quest_editor/QuestRunner.ts             | 73 +++++++++++++++++++++
 src/quest_editor/gui/QuestEditorToolBar.ts  |  4 +-
 src/quest_editor/stores/QuestEditorStore.ts | 29 ++------
 3 files changed, 80 insertions(+), 26 deletions(-)
 create mode 100644 src/quest_editor/QuestRunner.ts

diff --git a/src/quest_editor/QuestRunner.ts b/src/quest_editor/QuestRunner.ts
new file mode 100644
index 00000000..b8efc917
--- /dev/null
+++ b/src/quest_editor/QuestRunner.ts
@@ -0,0 +1,73 @@
+import { ExecutionResult, VirtualMachine } from "./scripting/vm";
+import { QuestModel } from "./model/QuestModel";
+import { VirtualMachineIO } from "./scripting/vm/io";
+import { AsmToken } from "./scripting/instructions";
+import Logger from "js-logger";
+
+const logger = Logger.get("quest_editor/QuestRunner");
+
+export class QuestRunner {
+    private readonly vm: VirtualMachine;
+    private animation_frame?: number;
+
+    constructor() {
+        this.vm = new VirtualMachine(this.create_vm_io());
+    }
+
+    run(quest: QuestModel): void {
+        if (this.animation_frame != undefined) {
+            cancelAnimationFrame(this.animation_frame);
+        }
+
+        this.vm.load_object_code(quest.object_code);
+        this.vm.start_thread(0);
+
+        this.animation_frame = requestAnimationFrame(this.execution_loop);
+    }
+
+    private execution_loop = (): void => {
+        this.vm.vsync();
+
+        let result: ExecutionResult;
+
+        do {
+            result = this.vm.execute();
+        } while (result == ExecutionResult.Ok);
+
+        if (result === ExecutionResult.WaitingVsync) {
+            this.animation_frame = requestAnimationFrame(this.execution_loop);
+        }
+    };
+
+    private create_vm_io = (): VirtualMachineIO => {
+        return {
+            async advance_msg(): Promise<any> {
+                throw new Error("Not implemented.");
+            },
+
+            window_msg: (msg: string): void => {
+                logger.info(`window_msg "${msg}"`);
+            },
+
+            message: (msg: string): void => {
+                logger.info(`message "${msg}"`);
+            },
+
+            add_msg: (msg: string): void => {
+                logger.info(`add_msg "${msg}"`);
+            },
+
+            winend: (): void => {},
+
+            mesend: (): void => {},
+
+            warning: (msg: string, srcloc?: AsmToken): void => {
+                logger.warn(msg);
+            },
+
+            error: (err: Error, srcloc?: AsmToken): void => {
+                logger.error(err);
+            },
+        };
+    };
+}
diff --git a/src/quest_editor/gui/QuestEditorToolBar.ts b/src/quest_editor/gui/QuestEditorToolBar.ts
index dcc41dd1..75052174 100644
--- a/src/quest_editor/gui/QuestEditorToolBar.ts
+++ b/src/quest_editor/gui/QuestEditorToolBar.ts
@@ -117,7 +117,7 @@ export class QuestEditorToolBar extends ToolBar {
                 quest_editor_store.set_current_area(area),
             ),
 
-            run_button.click.observe(quest_editor_store.run_current_quest_in_vm),
+            run_button.click.observe(quest_editor_store.run_current_quest),
 
             gui_store.on_global_keydown(GuiTool.QuestEditor, "Ctrl-O", () =>
                 open_file_button.click(),
@@ -140,7 +140,7 @@ export class QuestEditorToolBar extends ToolBar {
             gui_store.on_global_keydown(
                 GuiTool.QuestEditor,
                 "F5",
-                quest_editor_store.run_current_quest_in_vm,
+                quest_editor_store.run_current_quest,
             ),
         );
 
diff --git a/src/quest_editor/stores/QuestEditorStore.ts b/src/quest_editor/stores/QuestEditorStore.ts
index 71c3432d..2add81e3 100644
--- a/src/quest_editor/stores/QuestEditorStore.ts
+++ b/src/quest_editor/stores/QuestEditorStore.ts
@@ -27,8 +27,8 @@ import { CreateEntityAction } from "../actions/CreateEntityAction";
 import { RemoveEntityAction } from "../actions/RemoveEntityAction";
 import { Euler, Vector3 } from "three";
 import { RotateEntityAction } from "../actions/RotateEntityAction";
-import { ExecutionResult, VirtualMachine } from "../scripting/vm";
 import { convert_quest_from_model, convert_quest_to_model } from "./model_conversion";
+import { QuestRunner } from "../QuestRunner";
 import Logger = require("js-logger");
 
 const logger = Logger.get("quest_editor/gui/QuestEditorStore");
@@ -39,6 +39,7 @@ export class QuestEditorStore implements Disposable {
     private readonly _current_quest = property<QuestModel | undefined>(undefined);
     private readonly _current_area = property<AreaModel | undefined>(undefined);
     private readonly _selected_entity = property<QuestEntityModel | undefined>(undefined);
+    private readonly quest_runner = new QuestRunner();
 
     readonly debug: WritableProperty<boolean> = property(false);
     readonly undo = new UndoStack();
@@ -259,31 +260,11 @@ export class QuestEditorStore implements Disposable {
         }
     };
 
-    run_current_quest_in_vm = (): void => {
-        logger.setLevel(logger.TRACE);
-
+    run_current_quest = (): void => {
         const quest = this.current_quest.val;
 
-        if (!quest) {
-            throw new Error("No quest");
-        }
-
-        const vm = new VirtualMachine();
-        vm.load_object_code(quest.object_code);
-        vm.start_thread(0);
-
-        exec_loop: while (true) {
-            const exec_result = vm.execute();
-
-            switch (exec_result) {
-                case ExecutionResult.Ok:
-                    break;
-                case ExecutionResult.WaitingVsync:
-                    vm.vsync();
-                    break;
-                case ExecutionResult.Halted:
-                    break exec_loop;
-            }
+        if (quest) {
+            this.quest_runner.run(quest);
         }
     };
 }