Dotnet 6.0 ( wasm tool ) glfm on Webassembly

[DeafMan1983]

Hello everyone,

I don't expect everything because GLFM_Display is as pointer for C#

Console.WriteLine("Hello GLFW ( GLFM WASM )");
GLFW.Display* glfw_display = (GLFW.Display*)Marshal.SizeOf<GLFW.Display>();
GLFW.PlatformData* glfw_platformdata = (GLFW.PlatformData*)Marshal.SizeOf<GLFW.PlatformData>();
glfw_display->platformdata = glfw_platformdata;
GLFW.GetDisplaySize(glfw_display, out int glfw_width, out int glfw_height);
glfw_width = glfw_platformdata->width;
glfw_height = glfw_platformdata->height;

Console.WriteLine("GLFW Display WIDTH: " + glfw_width);
Console.WriteLine("GLFW Display HEIGHT: " + glfw_height);

I have tried to add in WASM but why do width and height jhave only "0"?

I thought glfmGetDisplayWidth and glfmGetDisplayHeight are implemented on Emscription

And It doesn't throw errors. just shows only 0.

1. Copy glfm.h, glfm_platform.h and glfm_platform_emscription.c to current working directory while you type `dotnet new blazor -o wasmtest
2. Write in csproj

<ItemGroup>
    <NativeFileReference Include="libEGL.c" ScanForPInvokes="true" />
    <NativeFileReference Include="openal32.c" ScanForPInvokes="true" />
    <NativeFileReference Include="glfm_platform_emscripten.c" ScanForPInvokes="true" />
  </ItemGroup>

Write class outside of Program's class

// GLFW ( GLFM WASM )
internal unsafe static class GLFW
{
	public const int MAX_ACTIVE_TOUCHES = 10;

	[StructLayout(LayoutKind.Sequential)]
	public unsafe struct PlatformData
	{
		public bool multitouchEnabled;
		public int width, height;
		public double scale;
		public IntPtr RenderingAPI; // GLFMRenderingAPI
		public bool mouseDown;
		// ... 
	}

	[StructLayout(LayoutKind.Sequential)]
	public unsafe struct Display
	{
		public PlatformData* platformdata;
		// ...
	}


	const string glfw_wasm = "glfm_platform_emscripten";

	[DllImport(glfw_wasm)]
	private static extern void glfmGetDisplaySize(Display *display, int *width,  int *height);

	public static void GetDisplaySize(Display *display, int *width,  int *height)
	{
		if (glfmGetDisplaySize != null)
			glfmGetDisplaySize(display, width, height);
	}
	public static void GetDisplaySize(Display *display, out int width, out int height)
	{
		fixed (int* width_ptt = &width)
		{
			fixed (int* height_ptr = &height)
			{
				GetDisplaySize(display, width_ptt, height_ptr);
			}
		}
	}

	// ...
}

iinside Program's class static int Main(string[] args)

		Console.WriteLine("Hello GLFW ( GLFM WASM )");
		GLFW.Display* glfw_display = (GLFW.Display*)Marshal.SizeOf<GLFW.Display>();
		GLFW.PlatformData* glfw_platformdata = (GLFW.PlatformData*)Marshal.SizeOf<GLFW.PlatformData>();
		glfw_display->platformdata = glfw_platformdata;
		GLFW.GetDisplaySize(glfw_display, out int glfw_width, out int glfw_height);
		glfw_width = glfw_platformdata->width;
		glfw_height = glfw_platformdata->height;

		Console.WriteLine("GLFW Display WIDTH: " + glfw_width);
		Console.WriteLine("GLFW Display HEIGHT: " + glfw_height);

I recommend you example with "Dotnet-webgl-example
You can download DotNet-WebGL-Example and add in void Frame() add gl functions but It is really required with shaders ( Do not write without shader because OpenGLES and OpenGL are different.

OpenGL can write without shader and triangle, quad etc are white
OpenGLES can't see white shapes because they disappear / hide cause they require for shader.

Enjoy your C# programming with glfm
But i don't understand why does it happen with width and height measures in WASM....