Initial commit

1 files changed, 70 insertions, 0 deletions

diff --git a/07-july/src/math/vector4f.c b/07-july/src/math/vector4f.c
new file mode 100644
index 0000000..735e679
--- /dev/null
+++ b/07-july/src/math/vector4f.c
@@ -0,0 +1,70 @@
+#include "vector4f.h"
+#include <SDL2/SDL.h>
+
+vec4_t vec4_create(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
+{
+    vec4_t a = {x, y, z, w};
+    return a;
+}
+
+vec4_t vec4_add(const vec4_t* a, const vec4_t* b)
+{
+    vec4_t c;
+    c.x = a->x + b->x;
+    c.y = a->y + b->y;
+    c.z = a->z + b->z;
+    c.w = a->w + b->w;
+    return c;
+}
+
+vec4_t vec4_sub(const vec4_t* a, const vec4_t* b)
+{
+    vec4_t c;
+    c.x = a->x - b->x;
+    c.y = a->y - b->y;
+    c.z = a->z - b->z;
+    c.w = a->w - b->w;
+    return c;
+}
+
+vec4_t vec4_scalar_mul(const vec4_t* a, GLfloat scalar)
+{
+    vec4_t c;
+    c.x = a->x * scalar;
+    c.y = a->y * scalar;
+    c.z = a->z * scalar;
+    c.w = a->w * scalar;
+    return c;
+}
+
+GLfloat vec4_dot_mul(const vec4_t* a, const vec4_t* b)
+{
+    return ( (a->x * b->x) + (a->y * b->y) + (a->z * b->z) + (a->w * b->w) );
+}
+
+
+vec4_t vec4_cross_mul(const vec4_t* a, const vec4_t* b)
+{
+    vec4_t c;
+    c.x = (a->y * b->z) - (a->z * b->y);
+    c.y = (a->z * b->x) - (a->x * b->z);
+    c.z = (a->x * b->y) - (a->y * b->x);
+    c.w = 1.0f;
+    return c;
+}
+
+GLfloat vec4_length(vec4_t* a)
+{
+    return SDL_sqrtf(SDL_pow(a->x, 2.0f) + SDL_pow(a->y, 2.0f) + SDL_pow(a->z, 2.0f) + SDL_pow(a->w, 2.0f) );
+}
+
+vec4_t vec4_normalize(vec4_t* a)
+{
+    vec4_t b;
+    GLfloat length = vec4_length(a);
+    b.x = a->x / length;
+    b.y = a->y / length;
+    b.z = a->z / length;
+    b.w = a->w / length;
+    return b;
+}