From 4379388b521e17184a299ad699ea2761bca8e516 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Sun, 28 Aug 2011 02:26:43 +0000
Subject: [PATCH] test: add first test routines for the half class.

---
 test/Makefile.am   |  12 ++++-
 test/half.cpp      | 107 +++++++++++++++++++++++++++++++++++++++++++++
 test/lol-bench.cpp |  48 ++++++++++++++++++++
 3 files changed, 165 insertions(+), 2 deletions(-)
 create mode 100644 test/half.cpp
 create mode 100644 test/lol-bench.cpp

diff --git a/test/Makefile.am b/test/Makefile.am
index 748087d3..23752fbd 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -5,17 +5,25 @@ if USE_CPPUNIT
 cppunit_tests = lol-test
 endif
 
-noinst_PROGRAMS = quad $(cppunit_tests)
+bench: lol-bench
+	./lol-bench
+
+noinst_PROGRAMS = quad lol-bench $(cppunit_tests)
 
 TESTS = $(cppunit_tests)
 
-lol_test_SOURCES = lol-test.cpp matrix.cpp
+lol_test_SOURCES = lol-test.cpp matrix.cpp half.cpp
 lol_test_CXXFLAGS = $(CPPUNIT_CFLAGS)
 lol_test_CPPFLAGS = @LOL_CFLAGS@ @PIPI_CFLAGS@
 lol_test_LDADD = $(CPPUNIT_LIBS)
 lol_test_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
 lol_test_DEPENDENCIES = $(top_builddir)/src/liblol.a
 
+lol_bench_SOURCES = lol-bench.cpp
+lol_bench_CPPFLAGS = @LOL_CFLAGS@ @PIPI_CFLAGS@
+lol_bench_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
+lol_bench_DEPENDENCIES = $(top_builddir)/src/liblol.a
+
 quad_SOURCES = debug/quad.cpp
 quad_CPPFLAGS = @LOL_CFLAGS@ @PIPI_CFLAGS@
 quad_LDFLAGS = $(top_builddir)/src/liblol.a @LOL_LIBS@ @PIPI_LIBS@
diff --git a/test/half.cpp b/test/half.cpp
new file mode 100644
index 00000000..e921fd22
--- /dev/null
+++ b/test/half.cpp
@@ -0,0 +1,107 @@
+//
+// 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.
+//
+
+#if defined HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include <cppunit/extensions/HelperMacros.h>
+#include <cppunit/TestCaller.h>
+#include <cppunit/TestCase.h>
+#include <cppunit/TestSuite.h>
+
+#include "core.h"
+
+namespace lol
+{
+
+class HalfTest : public CppUnit::TestCase
+{
+    CPPUNIT_TEST_SUITE(HalfTest);
+    CPPUNIT_TEST(test_half_makebits);
+    CPPUNIT_TEST(test_half_makeslow);
+    CPPUNIT_TEST(test_half_makefast);
+    CPPUNIT_TEST(test_half_to_float);
+    CPPUNIT_TEST_SUITE_END();
+
+public:
+    HalfTest() : CppUnit::TestCase("Matrix Test") {}
+
+    void setUp()
+    {
+    }
+
+    void tearDown() {}
+
+    void test_half_makebits()
+    {
+        for (unsigned int i = 0; i < 0x10000; i++)
+        {
+            half a = half::makebits(i);
+            uint16_t b = i;
+            CPPUNIT_ASSERT_EQUAL(a.bits(), b);
+        }
+    }
+
+    void test_half_makeslow()
+    {
+        for (size_t i = 0; i < 8; i++)
+        {
+            half a = half::makeslow(array1[i].f);
+            uint16_t b = array1[i].x;
+            CPPUNIT_ASSERT_EQUAL(a.bits(), b);
+        }
+    }
+
+    void test_half_makefast()
+    {
+        for (size_t i = 0; i < 8; i++)
+        {
+            half a = half::makefast(array1[i].f);
+            uint16_t b = array1[i].x;
+            CPPUNIT_ASSERT_EQUAL(a.bits(), b);
+        }
+    }
+
+    void test_half_to_float()
+    {
+#if 0
+        for (unsigned int i = 0; i < 0x10000; i++)
+        {
+            half a = half::makebits(i);
+            half b = half::makefast((float)a);
+            //CPPUNIT_ASSERT_EQUAL(a.bits(), b.bits());
+        }
+    }
+#endif
+    }
+
+private:
+    struct TestPair { float f; uint16_t x; };
+
+    static TestPair const array1[];
+};
+
+HalfTest::TestPair const HalfTest::array1[] =
+{
+    { 0.0f,     0x0000 },
+    { -0.0f,    0x8000 },
+    { 1.0f,     0x3c00 },
+    { -1.0f,    0xbc00 },
+    { 2.0f,     0x4000 },
+    { 0.5f,     0x3800 },
+    { 0.125f,   0x3000 },
+    { 15.9375f, 0x4bf8 },
+};
+
+CPPUNIT_TEST_SUITE_REGISTRATION(HalfTest);
+
+} /* namespace lol */
+
diff --git a/test/lol-bench.cpp b/test/lol-bench.cpp
new file mode 100644
index 00000000..6ee7036a
--- /dev/null
+++ b/test/lol-bench.cpp
@@ -0,0 +1,48 @@
+//
+// Lol Engine - Benchmark program
+//
+// Copyright: (c) 2005-2011 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.
+//
+
+#if defined HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+#include "core.h"
+#include "loldebug.h"
+
+using namespace std;
+using namespace lol;
+
+int main(int argc, char **argv)
+{
+    Timer timer;
+
+    uint16_t total = 0;
+    for (uint32_t i = 0; i < 0xffffffffu; i++)
+    {
+        union { float f; uint32_t x; } u;
+        u.x = i;
+
+        half h = half::makeslow(u.f);
+        total ^= h.bits();
+    }
+    Log::Info("time for makeslow: %f (hash %04x)\n", timer.GetMs(), total);
+
+    for (uint32_t i = 0; i < 0xffffffffu; i++)
+    {
+        union { float f; uint32_t x; } u;
+        u.x = i;
+
+        half h = half::makefast(u.f);
+        total ^= h.bits();
+    }
+    Log::Info("time for makefast: %f (hash %04x)\n", timer.GetMs(), total);
+
+    return EXIT_SUCCESS;
+}
+