Add pseudorandom functions for floats.

src/Makefile.am

@@ -8,7 +8,7 @@ liblol_a_SOURCES = \
     forge.cpp forge.h video.cpp video.h timer.cpp timer.h bitfield.h \
     profiler.cpp profiler.h input.h input.cpp world.cpp world.h \
     sample.cpp sample.h sampler.cpp sampler.h text.cpp text.h \
-    emitter.cpp emitter.h \
+    emitter.cpp emitter.h numeric.h \
     \
     sdlinput.cpp sdlinput.h \
     \

src/core.h

@@ -18,6 +18,7 @@
 
 // Base types
 #include "matrix.h"
+#include "numeric.h"
 #include "timer.h"
 
 // Static classes

src/matrix.h

@@ -140,19 +140,5 @@ typedef Vec3<int> Int3;
 GLOBALS(2)
 GLOBALS(3)
 
-/* A few utility functions */
-template <typename T> static inline T PotUp(T val)
-{
-    val = val - 1;
-    //if (sizeof(val) > 8) val = val | (val >> 64);
-    //if (sizeof(val) > 4) val = val | (val >> 32);
-    if (sizeof(val) > 2) val = val | (val >> 16);
-    if (sizeof(val) > 1) val = val | (val >> 8);
-    val = val | (val >> 4);
-    val = val | (val >> 2);
-    val = val | (val >> 1);
-    return val + 1;
-}
-
 #endif // __DH_MATRIX_H__
 

src/numeric.h

@@ -0,0 +1,52 @@
+//
+// Lol Engine
+//
+// Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net>
+//   This program is free software; you can redistribute it and/or
+//   modify it under the terms of the Do What The Fuck You Want To
+//   Public License, Version 2, as published by Sam Hocevar. See
+//   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
+//
+
+//
+// The Matrix classes
+// ------------------
+//
+
+#if !defined __DH_NUMERIC_H__
+#define __DH_NUMERIC_H__
+
+#include <cmath>
+#include <cstdlib>
+
+/* Random float value */
+static inline float RandF()
+{
+    return (float)rand() / RAND_MAX;
+}
+
+static inline float RandF(float val)
+{
+    return RandF() * val;
+}
+
+static inline float RandF(float min, float max)
+{
+    return min + RandF() * (max - min);
+}
+
+/* Next power of two. */
+template <typename T> static inline T PotUp(T val)
+{
+    val = val - 1;
+    if (sizeof(val) > 4) val = val | ((uint64_t)val >> 32);
+    if (sizeof(val) > 2) val = val | ((uint64_t)val >> 16);
+    if (sizeof(val) > 1) val = val | ((uint64_t)val >> 8);
+    val = val | ((uint64_t)val >> 4);
+    val = val | ((uint64_t)val >> 2);
+    val = val | ((uint64_t)val >> 1);
+    return val + 1;
+}
+
+#endif // __DH_NUMERIC_H__
+

win32/deushax.vcxproj

@@ -29,6 +29,7 @@
     <ClInclude Include="..\src\layer.h" />
     <ClInclude Include="..\src\map.h" />
     <ClInclude Include="..\src\matrix.h" />
+    <ClInclude Include="..\src\numeric.h" />
     <ClInclude Include="..\src\profiler.h" />
     <ClInclude Include="..\src\sample.h" />
     <ClInclude Include="..\src\sampler.h" />

win32/deushax.vcxproj.filters

@@ -51,6 +51,9 @@
     <ClInclude Include="..\src\matrix.h">
       <Filter>lolengine</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\numeric.h">
+      <Filter>lolengine</Filter>
+    </ClInclude>
     <ClInclude Include="..\src\profiler.h">
       <Filter>lolengine</Filter>
     </ClInclude>

win32/monsterz.vcxproj

@@ -32,6 +32,7 @@
     <ClInclude Include="..\src\layer.h" />
     <ClInclude Include="..\src\map.h" />
     <ClInclude Include="..\src\matrix.h" />
+    <ClInclude Include="..\src\numeric.h" />
     <ClInclude Include="..\src\profiler.h" />
     <ClInclude Include="..\src\sample.h" />
     <ClInclude Include="..\src\sampler.h" />

win32/monsterz.vcxproj.filters

@@ -51,6 +51,9 @@
     <ClInclude Include="..\src\matrix.h">
       <Filter>lolengine</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\numeric.h">
+      <Filter>lolengine</Filter>
+    </ClInclude>
     <ClInclude Include="..\src\profiler.h">
       <Filter>lolengine</Filter>
     </ClInclude>