132 lines
3.9 KiB
C#
132 lines
3.9 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Runtime.InteropServices.JavaScript;
|
|
|
|
namespace Examples.Web;
|
|
|
|
/// <summary>
|
|
/// Browser host: owns the single raylib window and the "current" example. The frame loop is
|
|
/// driven from JavaScript (main.js, via requestAnimationFrame) since a blocking C# loop would
|
|
/// freeze the page. Methods marked [JSExport] are called from main.js.
|
|
///
|
|
/// <para>
|
|
/// Every switch applies <see cref="IExample.TargetFps"/> and resets the cursor to visible.
|
|
/// Cursor hiding, <see cref="IExample.ConfigFlags"/>, and per-example window size are not
|
|
/// honored in the browser; the canvas stays 800x450 and the pointer stays visible.
|
|
/// </para>
|
|
/// </summary>
|
|
public partial class Host
|
|
{
|
|
public const int screenWidth = 800;
|
|
public const int screenHeight = 450;
|
|
|
|
private static readonly List<IExample> _examples = new(ExampleRegistry.BrowserExamples);
|
|
|
|
private static IExample _current;
|
|
|
|
public static void Main()
|
|
{
|
|
InitWindow(screenWidth, screenHeight, "raylib-cs web examples");
|
|
SetTargetFPS(60);
|
|
|
|
// main.js selects the first example, so its init failures surface through SetExample.
|
|
}
|
|
|
|
/// <summary>Render one frame of the current example; false if it threw and was torn down.</summary>
|
|
[JSExport]
|
|
public static bool UpdateFrame()
|
|
{
|
|
if (_current == null)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
try
|
|
{
|
|
_current.Update();
|
|
return true;
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
// Don't let one misbehaving example kill the whole page; log and stop driving it.
|
|
Console.WriteLine($"[Examples.Web] '{_current.Name}' threw during Update: {ex}");
|
|
TryUnload(_current);
|
|
_current = null;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// <summary>Switch the active example by name; false on unknown name or failed Init.</summary>
|
|
[JSExport]
|
|
public static bool SetExample(string name)
|
|
{
|
|
var next = _examples.Find(e => e.Name == name);
|
|
if (next == null)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (_current != null)
|
|
{
|
|
TryUnload(_current);
|
|
_current = null;
|
|
}
|
|
|
|
// Reset the baseline; an example may hide/lock the cursor from its own Update(), and
|
|
// CursorDisabled/CursorHidden are deliberately never applied in the browser.
|
|
EnableCursor();
|
|
ShowCursor();
|
|
SetTargetFPS(next.TargetFps);
|
|
|
|
try
|
|
{
|
|
next.Init();
|
|
_current = next;
|
|
return true;
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
Console.WriteLine($"[Examples.Web] '{next.Name}' failed to initialize: {ex}");
|
|
TryUnload(next);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// <summary>Target FPS of the current example; main.js paces the frame loop with it.</summary>
|
|
[JSExport]
|
|
public static int GetCurrentTargetFps()
|
|
{
|
|
return _current?.TargetFps ?? 60;
|
|
}
|
|
|
|
/// <summary>Newline-separated example names, used to populate the nav dropdown.</summary>
|
|
[JSExport]
|
|
public static string GetExampleNames()
|
|
{
|
|
return string.Join("\n", _examples.ConvertAll(e => e.Name));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Map browser CSS mouse coordinates to the fixed 800x450 framebuffer when the canvas
|
|
/// is CSS-scaled (integer/fit/native display modes in main.js).
|
|
/// </summary>
|
|
[JSExport]
|
|
public static void SetMouseScaleFromDisplay(float scaleX, float scaleY)
|
|
{
|
|
SetMouseOffset(0, 0);
|
|
SetMouseScale(scaleX, scaleY);
|
|
}
|
|
|
|
/// <summary>Best-effort Unload that never lets a failure cascade.</summary>
|
|
private static void TryUnload(IExample example)
|
|
{
|
|
try
|
|
{
|
|
example.Unload();
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
Console.WriteLine($"[Examples.Web] '{example.Name}' threw during Unload: {ex}");
|
|
}
|
|
}
|
|
}
|