From d4117ea72925be988245def333caad263d972077 Mon Sep 17 00:00:00 2001
From: Doyle Thai <dyl.thai@gmail.com>
Date: Sat, 18 Jun 2016 03:15:02 +1000
Subject: [PATCH] Start math library by preprocessor templating

---
 src/include/Dengine/Math.h    | 86 ++++++++++++++++++++++++++++++++++-
 src/include/Dengine/Texture.h |  4 +-
 2 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/src/include/Dengine/Math.h b/src/include/Dengine/Math.h
index 8213a18..f85d77f 100644
--- a/src/include/Dengine/Math.h
+++ b/src/include/Dengine/Math.h
@@ -3,10 +3,92 @@
 
 #include <Dengine/Common.h>
 
-inline f32 squared(const f32 a)
+#define squared(x) (x * x)
+#define abs(x) ((x) > 0 ? (x) : -(x))
+
+union v2
 {
-	f32 result = a * a;
+	struct
+	{
+		f32 x, y;
+	};
+	struct
+	{
+		f32 w, h;
+	};
+	f32 data[2];
+};
+
+union v3
+{
+	struct
+	{
+		f32 x, y, z;
+	};
+	struct
+	{
+		f32 r, g, b;
+	};
+	f32 data[3];
+};
+
+union v4
+{
+	struct
+	{
+		f32 x, y, z, w;
+	};
+	struct
+	{
+		f32 r, g, b, a;
+	};
+	f32 data[4];
+};
+
+INTERNAL inline v2 V2(const f32 x, const f32 y)
+{
+	v2 result = v2{x, y};
+	return result;
+}
+INTERNAL inline v3 V3(const f32 x, const f32 y, const f32 z)
+{
+	v3 result = v3{x, y, z};
+	return result;
+}
+INTERNAL inline v4 V4(const f32 x, const f32 y, const f32 z, const f32 w)
+{
+	v4 result = v4{x, y, z, w};
 	return result;
 }
 
+#define DEFINE_VECTOR_MATH(num) \
+INTERNAL inline v##num v##num##_add(const v##num a, const v##num b) \
+{ \
+	v##num result; \
+	for (i32 i = 0; i < ##num; i++) { result.data[i] = a.data[i] + b.data[i]; } \
+	return result; \
+} \
+INTERNAL inline v##num v##num##_sub(const v##num a, const v##num b) \
+{ \
+	v##num result; \
+	for (i32 i = 0; i < ##num; i++) { result.data[i] = a.data[i] - b.data[i]; } \
+	return result; \
+} \
+INTERNAL inline v##num v##num##_scale(const v##num a, const f32 b) \
+{ \
+	v##num result; \
+	for (i32 i = 0; i < ##num; i++) { result.data[i] = a.data[i] * b; } \
+	return result; \
+} \
+INTERNAL inline v##num v##num##_mul(const v##num a, const v##num b) \
+{ \
+	v##num result; \
+	for (i32 i = 0; i < ##num; i++) { result.data[i] = a.data[i] * b.data[i]; } \
+	return result; \
+} \
+
+DEFINE_VECTOR_MATH(2);
+DEFINE_VECTOR_MATH(3);
+DEFINE_VECTOR_MATH(4);
+
 #endif
diff --git a/src/include/Dengine/Texture.h b/src/include/Dengine/Texture.h
index 886affd..b0fcca1 100644
--- a/src/include/Dengine/Texture.h
+++ b/src/include/Dengine/Texture.h
@@ -29,7 +29,7 @@ struct Texture
 };
 
 // Generates texture from image data
-Texture genTexture(const GLuint width, const GLuint height, const GLint bytesPerPixel,
-                   const u8 *const image);
+Texture genTexture(const GLuint width, const GLuint height,
+                   const GLint bytesPerPixel, const u8 *const image);
 
 #endif