From e6f17baf6133fb83c5c72f7b173cf50c9c275224 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Thu, 24 Oct 2013 15:03:47 +1000
Subject: GMISC invsqrt() function. Fix a 64bit processor bug. Add support for
 processors where the floating point and integer endianness don't match. Add
 support for processors with a non-standard floating point format. Update
 gdisp_streaming demo with extra comments to reflect the above changes.

---
 demos/modules/gdisp/gdisp_streaming/gfxconf.h | 10 +++++----
 demos/modules/gdisp/gdisp_streaming/main.c    | 32 +++++++++++++++++++--------
 2 files changed, 29 insertions(+), 13 deletions(-)

(limited to 'demos')

diff --git a/demos/modules/gdisp/gdisp_streaming/gfxconf.h b/demos/modules/gdisp/gdisp_streaming/gfxconf.h
index 4db07fb9..b38be854 100644
--- a/demos/modules/gdisp/gdisp_streaming/gfxconf.h
+++ b/demos/modules/gdisp/gdisp_streaming/gfxconf.h
@@ -35,9 +35,11 @@
 /* Builtin Fonts */
 #define GDISP_INCLUDE_FONT_UI2          FALSE
 
-#define GFX_USE_GMISC			TRUE
-#define GMISC_NEED_FIXEDTRIG	FALSE
-#define GMISC_NEED_FASTTRIG		FALSE
-#define GMISC_NEED_INVSQRT		TRUE
+#define GFX_USE_GMISC				TRUE
+#define GMISC_NEED_FIXEDTRIG		FALSE
+#define GMISC_NEED_FASTTRIG			FALSE
+#define GMISC_NEED_INVSQRT			TRUE
+//#define GDISP_INVSQRT_MIXED_ENDIAN	TRUE
+//#define GDISP_INVSQRT_REAL_SLOW		TRUE
 
 #endif /* _GFXCONF_H */
diff --git a/demos/modules/gdisp/gdisp_streaming/main.c b/demos/modules/gdisp/gdisp_streaming/main.c
index 774ee833..5b857eeb 100644
--- a/demos/modules/gdisp/gdisp_streaming/main.c
+++ b/demos/modules/gdisp/gdisp_streaming/main.c
@@ -31,15 +31,29 @@
 #include "gfx.h"
 #include <math.h>
 
-#define Lightgrey ()
-#define Midgrey ()
-#define Darkgrey (HTML2COLOR(0x303030))
-
-#define BALLCOLOR1	Red
-#define BALLCOLOR2	Yellow
-#define WALLCOLOR	HTML2COLOR(0x303030)
-#define BACKCOLOR	HTML2COLOR(0xC0C0C0)
-#define FLOORCOLOR	HTML2COLOR(0x606060)
+/**
+ * NOTE:
+ *
+ * This demo uses floating point operations. Don't expect it to work with any
+ * speed unless your processor has an FPU.
+ *
+ * If you see garbage inside the ball as it is running rather than the red and yellow
+ * checkerboard pattern then the fast invsqrt() function in GMISC does not work on
+ * your processor.
+ *
+ * You can modify the implementation of invsqrt() by firstly defining
+ * 		#define GDISP_INVSQRT_MIXED_ENDIAN	TRUE
+ * in your gfxconf.h file.
+ *
+ * If it still doesn't work then instead define
+ * 		#define GDISP_INVSQRT_REAL_SLOW		TRUE
+ * in your gfxconf.h file. This should always work although it will probably be slow.
+ */
+#define BALLCOLOR1		Red
+#define BALLCOLOR2		Yellow
+#define WALLCOLOR		HTML2COLOR(0x303030)
+#define BACKCOLOR		HTML2COLOR(0xC0C0C0)
+#define FLOORCOLOR		HTML2COLOR(0x606060)
 #define SHADOWALPHA		(255-255*0.2)
 
 int main(void) {
-- 
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