Added noise test

tests/noise.c

@@ -0,0 +1,40 @@
+#include <MiniFB.h>
+
+#define WIDTH 800
+#define HEIGHT 600
+static unsigned int s_buffer[WIDTH * HEIGHT];
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+int main()
+{
+	int noise, carry, seed = 0xbeef;
+
+	if (!mfb_open("Noise Test", WIDTH, HEIGHT))
+		return 0;
+
+	while (1)
+	{
+		int i, state;
+
+		for (i = 0; i < WIDTH * HEIGHT; ++i)
+		{
+			noise = seed;
+			noise >>= 3;
+			noise ^= seed;
+			carry = noise & 1;
+			noise >>= 1;
+			seed >>= 1;
+			seed |= (carry << 30);
+			noise &= 0xFF;
+			s_buffer[i] = MFB_RGB(0, noise, 0); 
+		}
+
+		state = mfb_update(s_buffer);
+
+		if (state < 0 || state == MFB_KEY_ESC)
+			break;
+	}
+
+	mfb_close();
+}