From 1403faf737057ccd4ab0c55bee72a9d93525c174 Mon Sep 17 00:00:00 2001
From: Hans-Gert Dahmen <sexyludernatascha@gmail.com>
Date: Sun, 30 Oct 2011 03:07:13 +0000
Subject: [PATCH] removed ambiguous (wannabe) multi-platform lib

---
 animations/fpmath_patterns.c | 60 ++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/animations/fpmath_patterns.c b/animations/fpmath_patterns.c
index f4fccfb..a47e0d9 100644
--- a/animations/fpmath_patterns.c
+++ b/animations/fpmath_patterns.c
@@ -4,6 +4,7 @@
 #include "../pixel.h"
 #include "../util.h"
 #include "fpmath_patterns.h"
+#include <inttypes.h>
 
 #define DOUBLE_BUFFERING
 #ifdef DOUBLE_BUFFERING
@@ -91,6 +92,63 @@ static void fpmath_pattern(double const t_start,
 #ifdef ANIMATION_PLASMA
 #define PLASMA_X (1.0 / (NUM_COLS / (2.0 * M_PI)))
 
+#define INTEGERFUN 1
+#ifdef INTEGERFUN
+
+//XXX this is inefficient, as we could as this is a 2*PI sine and we'd really need only half of it - hansi
+const uint8_t sine_table[32] =
+{
+	128,152,176,198,218,234,245,253,255,253,245,234,218,198,176,152,
+	128,103,79,57,37,21,10,2,0,2,10,21,37,57,79,103
+};
+
+uint8_t sin_i(uint8_t phase)
+{
+	return sine_table[phase >> 3];
+}
+
+#define SQRT0x8000 181
+#define SQRT25x3   0x45483
+void plasma(void)
+{
+	uint8_t sqx, x, y, scale = 3, off = 0;
+
+#ifdef DOUBLE_BUFFERING
+	// double buffering to reduce half painted pictures
+	unsigned char pixmap_buffer[NUMPLANE][NUM_ROWS][LINEBYTES];
+#endif
+
+	while (off < 200)
+	{
+		for(x = 0; x < NUM_COLS; x++)
+		{
+			sqx = x*x;
+			for(y = 0; y < NUM_ROWS; y++)
+			{
+				unsigned char const mask = shl_table[y % 8U];
+				unsigned char const color = (uint16_t)sin_i(sqrt((uint16_t)sqx + ((uint16_t)y*(uint16_t)y)) * (255*255 / ((scale * NUM_COLS) / 2)) + off) * (NUMPLANE - 1) / 255 ;
+				unsigned char const x_8 = x / 8u;
+				for (unsigned char p = 0; p < NUMPLANE; ++p)
+				{
+					if (p <= (color - 1))
+					{
+						BUFFER[p][y][x_8] |= mask;
+					}
+					else
+					{
+						BUFFER[p][y][x_8] &= ~mask;
+					}
+				}
+			}
+		}
+
+#ifdef DOUBLE_BUFFERING
+		memcpy(pixmap, pixmap_buffer, sizeof(pixmap));
+#endif
+	}
+}
+
+#else
 /**
  * Draws a simple plasma like pattern.
  */
@@ -123,6 +181,8 @@ void plasma(void)
 }
 #endif
 
+#endif /* INTEGERFUN */
+
 
 #ifdef ANIMATION_PSYCHEDELIC
 /**