1 files changed, 58 insertions, 0 deletions
diff --git a/apps/mandelbrot.c b/apps/mandelbrot.c
new file mode 100644
index 0000000..6b6d45c
--- /dev/null
+++ b/apps/mandelbrot.c
@@ -0,0 +1,58 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <conv.h>
+#include <def.h>
+#include <gui.h>
+#include <input.h>
+#include <print.h>
+#include <random.h>
+#include <str.h>
+#include <sys.h>
+
+void draw_pixel(struct window *win, int x, int y, u32 c)
+{
+	int pos = x * (win->bpp >> 3) + y * win->pitch;
+	win->fb[pos + 0] = GET_BLUE(c);
+	win->fb[pos + 1] = GET_GREEN(c);
+	win->fb[pos + 2] = GET_RED(c);
+	win->fb[pos + 3] = GET_ALPHA(c);
+}
+
+int main()
+{
+	print("[mandelbrot window loaded]\n");
+
+	struct window *win = gui_new_window(WF_DEFAULT);
+	gui_fill(win, BG_COLOR);
+
+	int height = win->height;
+	int width = win->width;
+	int max = 500;
+
+	for (int row = 0; row < height; row++) {
+		for (int col = 0; col < width; col++) {
+			double c_re = (col - width / 2.0) * 4.0 / width;
+			double c_im = (row - height / 2.0) * 4.0 / width;
+			double x = 0, y = 0;
+			int iteration = 0;
+			while (x * x + y * y <= 4 && iteration < max) {
+				double x_new = x * x - y * y + c_re;
+				y = 2 * x * y + c_im;
+				x = x_new;
+				iteration++;
+			}
+			srand(iteration);
+			if (iteration < max)
+				draw_pixel(win, col, row, rand() | 0xff000000);
+			else
+				draw_pixel(win, col, row, BG_COLOR);
+		}
+	}
+	gui_redraw();
+
+	while (1) {
+		yield();
+	};
+
+	return 0;
+}