From b5babc8bdd95af48fc377bb888c70aad4956d58a Mon Sep 17 00:00:00 2001
From: John Tsiombikas <nuclear@mutantstargoat.com>
Date: Wed, 30 Aug 2017 05:43:03 +0300
Subject: [PATCH] cgmath initial commit

---
 CMakeLists.txt |   44 ++++++++++++++++++++++++++++++++
 src/cgmath.h   |   30 ++++++++++++++++++++++
 src/cgmath.inl |   76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 CMakeLists.txt
 create mode 100644 src/cgmath.h
 create mode 100644 src/cgmath.inl

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..fd714d1
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,44 @@
+cmake_minimum_required(VERSION 2.8.8)
+project(gph-cmath)
+
+include(GNUInstallDirs)
+
+set(SO_MAJOR 0)
+set(SO_MINOR 1)
+
+file(GLOB hdr "src/*.h")
+file(GLOB inl "src/*.inl")
+list(APPEND hdr ${inl})
+file(GLOB src "src/*.c")
+
+add_library(cgmath SHARED ${src} ${hdr})
+add_library(cgmath-static STATIC ${src} ${hdr})
+
+set_target_properties(cgmath PROPERTIES VERSION ${SO_MAJOR}.${SO_MINOR})
+set_target_properties(cgmath PROPERTIES SOVERSION ${SO_MAJOR})
+
+if(MSVC)
+	set_target_properties(cgmath PROPERTIES PREFIX "lib")
+	set_target_properties(cgmath PROPERTIES IMPORT_PREFIX "lib")
+	set_target_properties(cgmath-static PROPERTIES PREFIX "lib")
+
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4244 /wd4996")
+else()
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wall")
+endif()
+
+if(NOT WIN32)
+	set_target_properties(cgmath-static PROPERTIES OUTPUT_NAME cgmath)
+endif()
+
+install(TARGETS cgmath
+	RUNTIME DESTINATION bin
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+install(TARGETS cgmath-static
+	RUNTIME DESTINATION bin
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+install(FILES ${hdr} DESTINATION include/cgmath)
diff --git a/src/cgmath.h b/src/cgmath.h
new file mode 100644
index 0000000..c033a22
--- /dev/null
+++ b/src/cgmath.h
@@ -0,0 +1,30 @@
+/* C version of the graphene math library */
+#ifndef CGMATH_H_
+#define CGMATH_H_
+
+#include <math.h>
+
+typedef struct {
+	float x, y, z;
+} cgm_vec3;
+
+typedef struct {
+	float x, y, z, w;
+} cgm_quat;
+
+static inline void cgm_vadd(cgm_vec3 *a, const cgm_vec3 *b);
+static inline void cgm_vsub(cgm_vec3 *a, const cgm_vec3 *b);
+static inline void cgm_vmul(cgm_vec3 *a, const cgm_vec3 *b);
+static inline void cgm_vscale(cgm_vec3 *v, float s);
+
+static inline float cgm_vdot(const cgm_vec3 *a, const cgm_vec3 *b);
+static inline void cgm_vcross(cgm_vec3 *res, const cgm_vec3 *a, const cgm_vec3 *b);
+static inline float cgm_vlength(const cgm_vec3 *v);
+static inline float cgm_vlength_sq(const cgm_vec3 *v);
+static inline float cgm_vdist(const cgm_vec3 *a, const cgm_vec3 *b);
+static inline float cgm_vdist_sq(const cgm_vec3 *a, const cgm_vec3 *b);
+static inline void cgm_vnormalize(cgm_vec3 *v);
+
+#include "cgmath.inl"
+
+#endif	/* CGMATH_H_ */
diff --git a/src/cgmath.inl b/src/cgmath.inl
new file mode 100644
index 0000000..081452c
--- /dev/null
+++ b/src/cgmath.inl
@@ -0,0 +1,76 @@
+static inline void cgm_vadd(cgm_vec3 *a, const cgm_vec3 *b)
+{
+	a->x += b->x;
+	a->y += b->y;
+	a->z += b->z;
+}
+
+static inline void cgm_vsub(cgm_vec3 *a, const cgm_vec3 *b)
+{
+	a->x -= b->x;
+	a->y -= b->y;
+	a->z -= b->z;
+}
+
+static inline void cgm_vmul(cgm_vec3 *a, const cgm_vec3 *b)
+{
+	a->x *= b->x;
+	a->y *= b->y;
+	a->z *= b->z;
+}
+
+static inline void cgm_vscale(cgm_vec3 *v, float s)
+{
+	v->x *= s;
+	v->y *= s;
+	v->z *= s;
+}
+
+static inline float cgm_vdot(const cgm_vec3 *a, const cgm_vec3 *b)
+{
+	return a->x * b->x + a->y * b->y + a->z * b->z;
+}
+
+static inline void cgm_vcross(cgm_vec3 *res, const cgm_vec3 *a, const cgm_vec3 *b)
+{
+	res->x = a->y * b->z - a->z * b->y;
+	res->y = a->z * b->x - a->x * b->z;
+	res->z = a->x * b->y - a->y * b->x;
+}
+
+static inline float cgm_vlength(const cgm_vec3 *v)
+{
+	return sqrt(v->x * v->x + v->y * v->y + v->z * v->z);
+}
+
+static inline float cgm_vlength_sq(const cgm_vec3 *v)
+{
+	return v->x * v->x + v->y * v->y + v->z * v->z;
+}
+
+static inline float cgm_vdist(const cgm_vec3 *a, const cgm_vec3 *b)
+{
+	float dx = a->x - b->x;
+	float dy = a->y - b->y;
+	float dz = a->z - b->z;
+	return sqrt(dx * dx + dy * dy + dz * dz);
+}
+
+static inline float cgm_vdist_sq(const cgm_vec3 *a, const cgm_vec3 *b)
+{
+	float dx = a->x - b->x;
+	float dy = a->y - b->y;
+	float dz = a->z - b->z;
+	return dx * dx + dy * dy + dz * dz;
+}
+
+static inline void cgm_vnormalize(cgm_vec3 *v)
+{
+	float len = cgm_vlength(v);
+	if(len != 0.0f) {
+		float s = 1.0f / len;
+		v->x *= s;
+		v->y *= s;
+		v->z *= s;
+	}
+}
-- 
1.7.10.4