From 0317f964f43995d26d4a54d2f7d37b686ee5a97b Mon Sep 17 00:00:00 2001
From: flatmush <flatmush@d3e1167c-abe1-51d5-8199-f9061ebe54e4>
Date: Fri, 25 Feb 2011 15:32:23 +0000
Subject: Added option to replace sin function with ~384KiB look-up table for
 fastest and most accurate results. Added tool to generate sin tables. Tests
 indicate that using a lut is still ~2.1% out from sinf so it's very possible
 that our sin function is more accurate than the libmath sinf function on the
 computer I'm testing with. In which case the accuracy results are offset by
 that amount.

---
 fixsingen/fixsingen.cbp    | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 fixsingen/fixsingen.depend | 22 +++++++++++++++++++++
 fixsingen/main.c           | 35 +++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 fixsingen/fixsingen.cbp
 create mode 100644 fixsingen/fixsingen.depend
 create mode 100644 fixsingen/main.c

(limited to 'fixsingen')

diff --git a/fixsingen/fixsingen.cbp b/fixsingen/fixsingen.cbp
new file mode 100644
index 0000000..7282665
--- /dev/null
+++ b/fixsingen/fixsingen.cbp
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="fixsingen" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="dbg">
+				<Option output="bin\dbg\fixsingen" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj\dbg\" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="rel">
+				<Option output="bin\rel\fixsingen" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj\rel\" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+			<Add directory="..\" />
+		</Compiler>
+		<Linker>
+			<Add library="..\libfixmath\libfixmath.a" />
+		</Linker>
+		<Unit filename="main.c">
+			<Option compilerVar="CC" />
+		</Unit>
+		<Extensions>
+			<code_completion />
+			<envvars />
+			<debugger />
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>
diff --git a/fixsingen/fixsingen.depend b/fixsingen/fixsingen.depend
new file mode 100644
index 0000000..c4ab73e
--- /dev/null
+++ b/fixsingen/fixsingen.depend
@@ -0,0 +1,22 @@
+# depslib dependency file v1.0
+1298645188 source:g:\vrfx\libfixmath\fixsingen\main.c
+	<stdio.h>
+	<stdlib.h>
+	<inttypes.h>
+	<math.h>
+	<libfixmath/fixmath.h>
+
+1298453688 g:\vrfx\libfixmath\\libfixmath\fixmath.h
+	"uint32.h"
+	"fract32.h"
+	"fix16.h"
+
+1298453688 g:\vrfx\libfixmath\\libfixmath\uint32.h
+	<stdint.h>
+
+1298453688 g:\vrfx\libfixmath\\libfixmath\fract32.h
+	<stdint.h>
+
+1298634082 g:\vrfx\libfixmath\\libfixmath\fix16.h
+	<stdint.h>
+
diff --git a/fixsingen/main.c b/fixsingen/main.c
new file mode 100644
index 0000000..ce71647
--- /dev/null
+++ b/fixsingen/main.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <math.h>
+#include <libfixmath/fixmath.h>
+
+int main(int argc, char** argv) {
+	FILE* fp = fopen("fix16_trig_sin_lut.h", "wb");
+	if(fp == NULL) {
+		fprintf(stderr, "Error: Unable to open file for writing.\n");
+		return EXIT_FAILURE;
+	}
+
+	fprintf(fp, "#ifndef __fix16_trig_sin_lut_h__\n");
+	fprintf(fp, "#define __fix16_trig_sin_lut_h__\n");
+	fprintf(fp, "\n");
+
+	fprintf(fp, "static fix16_t _fix16_sin_lut[%"PRIi32"] = {", (fix16_pi >> 1));
+
+	uintptr_t i;
+	for(i = 0; i < (fix16_pi >> 1); i++) {
+		if((i & 7) == 0)
+			fprintf(fp, "\n\t");
+		fix16_t fix16_sin_lut = fix16_from_dbl(sin(fix16_to_dbl(i)));
+		fprintf(fp, "%"PRIi32", ", fix16_sin_lut);
+	}
+	fprintf(fp, "\n\t};\n");
+
+	fprintf(fp, "\n");
+	fprintf(fp, "#endif\n");
+
+	fclose(fp);
+
+    return EXIT_SUCCESS;
+}
-- 
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