# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1505440837 -10800
# Node ID 1fa939507d8b86ec80b9b1f35be07545544f361e
# Parent  f9b1ff21fd62ef9331fd66f2f3e4f05c2058e38f
fast floating point->int conversion

diff -r f9b1ff21fd62 -r 1fa939507d8b src/fixedp.h
--- a/src/fixedp.h	Mon Mar 10 17:28:28 2014 +0200
+++ b/src/fixedp.h	Fri Sep 15 05:00:37 2017 +0300
@@ -31,6 +31,12 @@
 extern const fixed fixed_tenth;
 extern const fixed fixed_255;*/
 
+static __inline long cround64(double val)
+{
+	val += 6755399441055744.0;
+	return *(long*)&val;
+}
+
 #ifdef DBG_USE_FLOAT
 /* ------- debug mode, use floating point -------- */
 #define FIXED_INT_PART(n)	((int)(n))
diff -r f9b1ff21fd62 -r 1fa939507d8b src/mglimpl.h
--- a/src/mglimpl.h	Mon Mar 10 17:28:28 2014 +0200
+++ b/src/mglimpl.h	Fri Sep 15 05:00:37 2017 +0300
@@ -14,7 +14,8 @@
 #define ZTILE(x)			(((x) & ~ZTILE_MASK) >> ZTILE_SHIFT)
 #define ZTILE_OFFS(x)		((x) & ZTILE_MASK)
 
-#define ROUND(x)	((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5)
+/*#define ROUND(x)	((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5)*/
+#define ROUND(x) cround64(x)
 
 
 typedef float mat4_t[16];
diff -r f9b1ff21fd62 -r 1fa939507d8b src/scantmpl.h
--- a/src/scantmpl.h	Mon Mar 10 17:28:28 2014 +0200
+++ b/src/scantmpl.h	Fri Sep 15 05:00:37 2017 +0300
@@ -251,7 +251,9 @@
 #ifdef INTERP_DEPTH
 		long pix = (sline + x0 + i) - fb->pixels;
 #ifdef RAST_FLOAT
-		unsigned short zval = (unsigned short)(z * USHRT_MAX);
+		/*unsigned short zval = (unsigned short)(z * USHRT_MAX);*/
+		float zn = z + 1.0;
+		unsigned short zval = ((*(long*)&zn) & 0x7fffff) >> 7;
 #else
 		unsigned short zval = (unsigned short)((z >> 1) & 0xffff);
 #endif