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Example/src/Program.bf

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+using System;
+
+using SDL3;
+
+namespace SDL3.Example;
+
+class Program
+{
+	/*
+	 * This example code creates an SDL window and renderer, and then clears the
+	 * window to a different color every frame, so you'll effectively get a window
+	 * that's smoothly fading between colors.
+	 *
+	 * This code is public domain. Feel free to use it for any purpose!
+	 */
+
+	/* We will use this renderer to draw into this window every frame. */
+	static SDL.Window *window = null;
+	static SDL.Renderer *renderer = null;
+
+	/* This function runs once at startup. */
+	static SDL.AppResult AppInit(void **appstate, int32 argc, char8 **argv)
+	{
+	    SDL.SetAppMetadata("Example Renderer Clear", "1.0", "com.example.renderer-clear");
+
+	    if (!SDL.Init(.Video)) {
+	        SDL.Log("Couldn't initialize SDL: %s", SDL.GetError());
+	        return .Failure;
+	    }
+
+	    if (!SDL.CreateWindowAndRenderer("examples/renderer/clear", 640, 480, .Resizable, &window, &renderer)) {
+	        SDL.Log("Couldn't create window/renderer: %s", SDL.GetError());
+	        return .Failure;
+	    }
+	    SDL.SetRenderLogicalPresentation(renderer, 640, 480, .Letterbox);
+
+	    return .Continue;  /* carry on with the program! */
+	}
+
+	/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
+	static SDL.AppResult AppEvent(void *appstate, SDL.Event *event)
+	{
+	    if (event.type == (.)SDL.EventType.Quit) {
+	        return .Success;  /* end the program, reporting success to the OS. */
+	    }
+	    return .Continue;  /* carry on with the program! */
+	}
+
+	/* This function runs once per frame, and is the heart of the program. */
+	static SDL.AppResult AppIterate(void *appstate)
+	{
+	    double now = ((double)SDL.GetTicks()) / 1000.0;  /* convert from milliseconds to seconds. */
+	    /* choose the color for the frame we will draw. The sine wave trick makes it fade between colors smoothly. */
+	    float red = (float) (0.5 + 0.5 * SDL.sin(now));
+	    float green = (float) (0.5 + 0.5 * SDL.sin(now + SDL.PI_D * 2 / 3));
+	    float blue = (float) (0.5 + 0.5 * SDL.sin(now + SDL.PI_D * 4 / 3));
+	    SDL.SetRenderDrawColorFloat(renderer, red, green, blue, SDL.ALPHA_OPAQUE_FLOAT);  /* new color, full alpha. */
+
+	    /* clear the window to the draw color. */
+	    SDL.RenderClear(renderer);
+
+	    /* put the newly-cleared rendering on the screen. */
+	    SDL.RenderPresent(renderer);
+
+	    return .Continue;  /* carry on with the program! */
+	}
+
+	/* This function runs once at shutdown. */
+	static void AppQuit(void *appstate, SDL.AppResult result)
+	{
+	    /* SDL will clean up the window/renderer for us. */
+	}
+
+	public static int Main(String[] args)
+	{
+		char8*[] argv = scope .[args.Count];
+		for (var arg in ref argv)
+			arg = args[@arg].Ptr;
+		return SDL.EnterAppMainCallbacks((.)argv.Count, argv.Ptr, => AppInit, => AppIterate, => AppEvent, => AppQuit);
+	}
+}