[cogl] Remove CoglVector3 type and use float * instead

[Robert Bragg <rbragg src gnome org>]

commit e163f1ca1a36c3bef006597a1f26b33f8ada155a
Author: Robert Bragg <robert linux intel com>
Date:   Fri Jan 13 18:23:11 2012 +0000

    Remove CoglVector3 type and use float * instead
    
    It proved to be inconvenient that we had a special CoglVector3 typedef
    for vectors instead of just accepting pointers to float arrays because
    you'd so often end up having to make awkward casts from another vector
    type into a CoglVector3 and then cast back again. We're hoping that
    taking float pointers instead will lead to less unnecessary casting.

 cogl/cogl-matrix.c     |   36 +++++-----
 cogl/cogl-quaternion.c |   34 +++++----
 cogl/cogl-quaternion.h |    6 +-
 cogl/cogl-vector.c     |  185 +++++++++++++++++++++++++-----------------------
 cogl/cogl-vector.h     |  136 +++++++++++++-----------------------
 5 files changed, 183 insertions(+), 214 deletions(-)
---
diff --git a/cogl/cogl-matrix.c b/cogl/cogl-matrix.c
index 92d13b8..58e00a5 100644
--- a/cogl/cogl-matrix.c
+++ b/cogl/cogl-matrix.c
@@ -2085,41 +2085,41 @@ cogl_matrix_look_at (CoglMatrix *matrix,
                      float world_up_z)
 {
   CoglMatrix tmp;
-  CoglVector3 forward;
-  CoglVector3 side;
-  CoglVector3 up;
+  float forward[3];
+  float side[3];
+  float up[3];
 
   /* Get a unit viewing direction vector */
-  cogl_vector3_init (&forward,
+  cogl_vector3_init (forward,
                      object_x - eye_position_x,
                      object_y - eye_position_y,
                      object_z - eye_position_z);
-  cogl_vector3_normalize (&forward);
+  cogl_vector3_normalize (forward);
 
-  cogl_vector3_init (&up, world_up_x, world_up_y, world_up_z);
+  cogl_vector3_init (up, world_up_x, world_up_y, world_up_z);
 
   /* Take the sideways direction as being perpendicular to the viewing
    * direction and the word up vector. */
-  cogl_vector3_cross_product (&side, &forward, &up);
-  cogl_vector3_normalize (&side);
+  cogl_vector3_cross_product (side, forward, up);
+  cogl_vector3_normalize (side);
 
   /* Now we have unit sideways and forward-direction vectors calculate
    * a new mutually perpendicular up vector. */
-  cogl_vector3_cross_product (&up, &side, &forward);
+  cogl_vector3_cross_product (up, side, forward);
 
-  tmp.xx = side.x;
-  tmp.yx = side.y;
-  tmp.zx = side.z;
+  tmp.xx = side[0];
+  tmp.yx = side[1];
+  tmp.zx = side[2];
   tmp.wx = 0;
 
-  tmp.xy = up.x;
-  tmp.yy = up.y;
-  tmp.zy = up.z;
+  tmp.xy = up[0];
+  tmp.yy = up[1];
+  tmp.zy = up[2];
   tmp.wy = 0;
 
-  tmp.xz = -forward.x;
-  tmp.yz = -forward.y;
-  tmp.zz = -forward.z;
+  tmp.xz = -forward[0];
+  tmp.yz = -forward[1];
+  tmp.zz = -forward[2];
   tmp.wz = 0;
 
   tmp.xw = 0;
diff --git a/cogl/cogl-quaternion.c b/cogl/cogl-quaternion.c
index 602c276..d55275a 100644
--- a/cogl/cogl-quaternion.c
+++ b/cogl/cogl-quaternion.c
@@ -74,36 +74,38 @@ cogl_quaternion_init (CoglQuaternion *quaternion,
                       float y,
                       float z)
 {
-  CoglVector3 axis = { x, y, z};
-  cogl_quaternion_init_from_angle_vector (quaternion, angle, &axis);
+  float axis[3] = { x, y, z};
+  cogl_quaternion_init_from_angle_vector (quaternion, angle, axis);
 }
 
 void
 cogl_quaternion_init_from_angle_vector (CoglQuaternion *quaternion,
                                         float angle,
-                                        const CoglVector3 *axis_in)
+                                        const float *axis3f_in)
 {
   /* NB: We are using quaternions to represent an axis (a), angle (ð) pair
    * in this form:
    * [w=cos(ð/2) ( x=sin(ð/2)*a.x, y=sin(ð/2)*a.y, z=sin(ð/2)*a.x )]
    */
-  CoglVector3 axis;
+  float axis[3];
   float half_angle;
   float sin_half_angle;
 
   /* XXX: Should we make cogl_vector3_normalize have separate in and
    * out args? */
-  axis = *axis_in;
-  cogl_vector3_normalize (&axis);
+  axis[0] = axis3f_in[0];
+  axis[1] = axis3f_in[1];
+  axis[2] = axis3f_in[2];
+  cogl_vector3_normalize (axis);
 
   half_angle = angle * _COGL_QUATERNION_DEGREES_TO_RADIANS * 0.5f;
   sin_half_angle = sinf (half_angle);
 
   quaternion->w = cosf (half_angle);
 
-  quaternion->x = axis.x * sin_half_angle;
-  quaternion->y = axis.y * sin_half_angle;
-  quaternion->z = axis.z * sin_half_angle;
+  quaternion->x = axis[0] * sin_half_angle;
+  quaternion->y = axis[1] * sin_half_angle;
+  quaternion->z = axis[2] * sin_half_angle;
 
   cogl_quaternion_normalize (quaternion);
 }
@@ -365,7 +367,7 @@ cogl_quaternion_get_rotation_angle (const CoglQuaternion *quaternion)
 
 void
 cogl_quaternion_get_rotation_axis (const CoglQuaternion *quaternion,
-                                   CoglVector3 *vector)
+                                   float *vector3)
 {
   float sin_half_angle_sqr;
   float one_over_sin_angle_over_2;
@@ -383,18 +385,18 @@ cogl_quaternion_get_rotation_axis (const CoglQuaternion *quaternion,
     {
       /* Either an identity quaternion or numerical imprecision.
        * Either way we return an arbitrary vector. */
-      vector->x = 1;
-      vector->y = 0;
-      vector->z = 0;
+      vector3[0] = 1;
+      vector3[1] = 0;
+      vector3[2] = 0;
       return;
     }
 
   /* Calculate 1 / sin(ð/2) */
   one_over_sin_angle_over_2 = 1.0f / sqrtf (sin_half_angle_sqr);
 
-  vector->x = quaternion->x * one_over_sin_angle_over_2;
-  vector->y = quaternion->y * one_over_sin_angle_over_2;
-  vector->z = quaternion->z * one_over_sin_angle_over_2;
+  vector3[0] = quaternion->x * one_over_sin_angle_over_2;
+  vector3[1] = quaternion->y * one_over_sin_angle_over_2;
+  vector3[2] = quaternion->z * one_over_sin_angle_over_2;
 }
 
 void
diff --git a/cogl/cogl-quaternion.h b/cogl/cogl-quaternion.h
index e1142c4..02512f8 100644
--- a/cogl/cogl-quaternion.h
+++ b/cogl/cogl-quaternion.h
@@ -164,7 +164,7 @@ cogl_quaternion_init (CoglQuaternion *quaternion,
 /**
  * cogl_quaternion_init_from_angle_vector:
  * @quaternion: An uninitialized #CoglQuaternion
- * @axis: your axis vector about which you want to rotate.
+ * @axis: your 3 component axis vector about which you want to rotate.
  *
  * Initializes a quaternion that rotates @angle degrees around the
  * given @axis vector. The axis vector does not need to be
@@ -178,7 +178,7 @@ cogl_quaternion_init (CoglQuaternion *quaternion,
 void
 cogl_quaternion_init_from_angle_vector (CoglQuaternion *quaternion,
                                         float angle,
-                                        const CoglVector3 *axis);
+                                        const float *axis3f);
 
 /**
  * cogl_quaternion_init_identity:
@@ -316,7 +316,7 @@ cogl_quaternion_get_rotation_angle (const CoglQuaternion *quaternion);
  */
 void
 cogl_quaternion_get_rotation_axis (const CoglQuaternion *quaternion,
-                                   CoglVector3 *vector);
+                                   float *vector3);
 
 /**
  * cogl_quaternion_normalize:
diff --git a/cogl/cogl-vector.c b/cogl/cogl-vector.c
index b22086c..d0205fb 100644
--- a/cogl/cogl-vector.c
+++ b/cogl/cogl-vector.c
@@ -32,25 +32,30 @@
 #include <math.h>
 #include <string.h>
 
+#define X 0
+#define Y 1
+#define Z 2
+#define W 3
+
 void
-cogl_vector3_init (CoglVector3 *vector, float x, float y, float z)
+cogl_vector3_init (float *vector, float x, float y, float z)
 {
-  vector->x = x;
-  vector->y = y;
-  vector->z = z;
+  vector[X] = x;
+  vector[Y] = y;
+  vector[Z] = z;
 }
 
 void
-cogl_vector3_init_zero (CoglVector3 *vector)
+cogl_vector3_init_zero (float *vector)
 {
-  memset (vector, 0, sizeof (CoglVector3));
+  memset (vector, 0, sizeof (float) * 3);
 }
 
 gboolean
 cogl_vector3_equal (gconstpointer v1, gconstpointer v2)
 {
-  CoglVector3 *vector0 = (CoglVector3 *)v1;
-  CoglVector3 *vector1 = (CoglVector3 *)v2;
+  float *vector0 = (float *)v1;
+  float *vector1 = (float *)v2;
 
   _COGL_RETURN_VAL_IF_FAIL (v1 != NULL, FALSE);
   _COGL_RETURN_VAL_IF_FAIL (v2 != NULL, FALSE);
@@ -59,160 +64,162 @@ cogl_vector3_equal (gconstpointer v1, gconstpointer v2)
    * for comparing the components so we just use == that will at least
    * consider -0 and 0 to be equal. */
   return
-    vector0->x == vector1->x &&
-    vector0->y == vector1->y &&
-    vector0->z == vector1->z;
+    vector0[X] == vector1[X] &&
+    vector0[Y] == vector1[Y] &&
+    vector0[Z] == vector1[Z];
 }
 
 gboolean
-cogl_vector3_equal_with_epsilon (const CoglVector3 *vector0,
-                                 const CoglVector3 *vector1,
+cogl_vector3_equal_with_epsilon (const float *vector0,
+                                 const float *vector1,
                                  float epsilon)
 {
   _COGL_RETURN_VAL_IF_FAIL (vector0 != NULL, FALSE);
   _COGL_RETURN_VAL_IF_FAIL (vector1 != NULL, FALSE);
 
-  if (fabsf (vector0->x - vector1->x) < epsilon &&
-      fabsf (vector0->y - vector1->y) < epsilon &&
-      fabsf (vector0->z - vector1->z) < epsilon)
+  if (fabsf (vector0[X] - vector1[X]) < epsilon &&
+      fabsf (vector0[Y] - vector1[Y]) < epsilon &&
+      fabsf (vector0[Z] - vector1[Z]) < epsilon)
     return TRUE;
   else
     return FALSE;
 }
 
-CoglVector3 *
-cogl_vector3_copy (const CoglVector3 *vector)
+float *
+cogl_vector3_copy (const float *vector)
 {
   if (vector)
-    return g_slice_dup (CoglVector3, vector);
+    return g_slice_copy (sizeof (float) * 3, vector);
   return NULL;
 }
 
 void
-cogl_vector3_free (CoglVector3 *vector)
+cogl_vector3_free (float *vector)
 {
-  g_slice_free (CoglVector3, vector);
+  g_slice_free1 (sizeof (float) * 3, vector);
 }
 
 void
-cogl_vector3_invert (CoglVector3 *vector)
+cogl_vector3_invert (float *vector)
 {
-  vector->x = -vector->x;
-  vector->y = -vector->y;
-  vector->z = -vector->z;
+  vector[X] = -vector[X];
+  vector[Y] = -vector[Y];
+  vector[Z] = -vector[Z];
 }
 
 void
-cogl_vector3_add (CoglVector3 *result,
-                  const CoglVector3 *a,
-                  const CoglVector3 *b)
+cogl_vector3_add (float *result,
+                  const float *a,
+                  const float *b)
 {
-  result->x = a->x + b->x;
-  result->y = a->y + b->y;
-  result->z = a->z + b->z;
+  result[X] = a[X] + b[X];
+  result[Y] = a[Y] + b[Y];
+  result[Z] = a[Z] + b[Z];
 }
 
 void
-cogl_vector3_subtract (CoglVector3 *result,
-                       const CoglVector3 *a,
-                       const CoglVector3 *b)
+cogl_vector3_subtract (float *result,
+                       const float *a,
+                       const float *b)
 {
-  result->x = a->x - b->x;
-  result->y = a->y - b->y;
-  result->z = a->z - b->z;
+  result[X] = a[X] - b[X];
+  result[Y] = a[Y] - b[Y];
+  result[Z] = a[Z] - b[Z];
 }
 
 void
-cogl_vector3_multiply_scalar (CoglVector3 *vector,
+cogl_vector3_multiply_scalar (float *vector,
                               float scalar)
 {
-  vector->x *= scalar;
-  vector->y *= scalar;
-  vector->z *= scalar;
+  vector[X] *= scalar;
+  vector[Y] *= scalar;
+  vector[Z] *= scalar;
 }
 
 void
-cogl_vector3_divide_scalar (CoglVector3 *vector,
+cogl_vector3_divide_scalar (float *vector,
                             float scalar)
 {
   float one_over_scalar = 1.0f / scalar;
-  vector->x *= one_over_scalar;
-  vector->y *= one_over_scalar;
-  vector->z *= one_over_scalar;
+  vector[X] *= one_over_scalar;
+  vector[Y] *= one_over_scalar;
+  vector[Z] *= one_over_scalar;
 }
 
 void
-cogl_vector3_normalize (CoglVector3 *vector)
+cogl_vector3_normalize (float *vector)
 {
   float mag_squared =
-    vector->x * vector->x +
-    vector->y * vector->y +
-    vector->z * vector->z;
+    vector[X] * vector[X] +
+    vector[Y] * vector[Y] +
+    vector[Z] * vector[Z];
 
   if (mag_squared > 0.0f)
     {
       float one_over_mag = 1.0f / sqrtf (mag_squared);
-      vector->x *= one_over_mag;
-      vector->y *= one_over_mag;
-      vector->z *= one_over_mag;
+      vector[X] *= one_over_mag;
+      vector[Y] *= one_over_mag;
+      vector[Z] *= one_over_mag;
     }
 }
 
 float
-cogl_vector3_magnitude (const CoglVector3 *vector)
+cogl_vector3_magnitude (const float *vector)
 {
-  return sqrtf (vector->x * vector->x +
-                vector->y * vector->y +
-                vector->z * vector->z);
+  return sqrtf (vector[X] * vector[X] +
+                vector[Y] * vector[Y] +
+                vector[Z] * vector[Z]);
 }
 
 void
-cogl_vector3_cross_product (CoglVector3 *result,
-                            const CoglVector3 *a,
-                            const CoglVector3 *b)
+cogl_vector3_cross_product (float *result,
+                            const float *a,
+                            const float *b)
 {
-  CoglVector3 tmp;
-
-  tmp.x = a->y * b->z - a->z * b->y;
-  tmp.y = a->z * b->x - a->x * b->z;
-  tmp.z = a->x * b->y - a->y * b->x;
-  *result = tmp;
+  float tmp[3];
+
+  tmp[X] = a[Y] * b[Z] - a[Z] * b[Y];
+  tmp[Y] = a[Z] * b[X] - a[X] * b[Z];
+  tmp[Z] = a[X] * b[Y] - a[Y] * b[X];
+  result[X] = tmp[X];
+  result[Y] = tmp[Y];
+  result[Z] = tmp[Z];
 }
 
 float
-cogl_vector3_dot_product (const CoglVector3 *a, const CoglVector3 *b)
+cogl_vector3_dot_product (const float *a, const float *b)
 {
-  return a->x * b->x + a->y * b->y + a->z * b->z;
+  return a[X] * b[X] + a[Y] * b[Y] + a[Z] * b[Z];
 }
 
 float
-cogl_vector3_distance (const CoglVector3 *a, const CoglVector3 *b)
+cogl_vector3_distance (const float *a, const float *b)
 {
-  float dx = b->x - a->x;
-  float dy = b->y - a->y;
-  float dz = b->z - a->z;
+  float dx = b[X] - a[X];
+  float dy = b[Y] - a[Y];
+  float dz = b[Z] - a[Z];
 
   return sqrtf (dx * dx + dy * dy + dz * dz);
 }
 
 #if 0
 void
-cogl_vector4_init (CoglVector4 *vector, float x, float y, float z)
+cogl_vector4_init (float *vector, float x, float y, float z)
 {
-  vector->x = x;
-  vector->y = y;
-  vector->z = z;
-  vector->w = w;
+  vector[X] = x;
+  vector[Y] = y;
+  vector[Z] = z;
+  vector[W] = w;
 }
 
 void
-cogl_vector4_init_zero (CoglVector4 *vector)
+cogl_vector4_init_zero (float *vector)
 {
   memset (vector, 0, sizeof (CoglVector4));
 }
 
 void
-cogl_vector4_init_from_vector4 (CoglVector4 *vector, CoglVector4 *src)
+cogl_vector4_init_from_vector4 (float *vector, float *src)
 {
   *vector4 = *src;
 }
@@ -226,8 +233,8 @@ cogl_vector4_equal (gconstpointer *v0, gconstpointer *v1)
   return memcmp (v1, v2, sizeof (float) * 4) == 0 ? TRUE : FALSE;
 }
 
-CoglVector4 *
-cogl_vector4_copy (CoglVector4 *vector)
+float *
+cogl_vector4_copy (float *vector)
 {
   if (vector)
     return g_slice_dup (CoglVector4, vector);
@@ -235,13 +242,13 @@ cogl_vector4_copy (CoglVector4 *vector)
 }
 
 void
-cogl_vector4_free (CoglVector4 *vector)
+cogl_vector4_free (float *vector)
 {
   g_slice_free (CoglVector4, vector);
 }
 
 void
-cogl_vector4_invert (CoglVector4 *vector)
+cogl_vector4_invert (float *vector)
 {
   vector.x = -vector.x;
   vector.y = -vector.y;
@@ -250,9 +257,9 @@ cogl_vector4_invert (CoglVector4 *vector)
 }
 
 void
-cogl_vector4_add (CoglVector4 *result,
-                  CoglVector4 *a,
-                  CoglVector4 *b)
+cogl_vector4_add (float *result,
+                  float *a,
+                  float *b)
 {
   result.x = a.x + b.x;
   result.y = a.y + b.y;
@@ -261,9 +268,9 @@ cogl_vector4_add (CoglVector4 *result,
 }
 
 void
-cogl_vector4_subtract (CoglVector4 *result,
-                       CoglVector4 *a,
-                       CoglVector4 *b)
+cogl_vector4_subtract (float *result,
+                       float *a,
+                       float *b)
 {
   result.x = a.x - b.x;
   result.y = a.y - b.y;
@@ -272,7 +279,7 @@ cogl_vector4_subtract (CoglVector4 *result,
 }
 
 void
-cogl_vector4_divide (CoglVector4 *vector,
+cogl_vector4_divide (float *vector,
                      float scalar)
 {
   float one_over_scalar = 1.0f / scalar;
diff --git a/cogl/cogl-vector.h b/cogl/cogl-vector.h
index 22307c5..c6824d6 100644
--- a/cogl/cogl-vector.h
+++ b/cogl/cogl-vector.h
@@ -44,50 +44,9 @@ G_BEGIN_DECLS
  * component float vectors.
  */
 
-/* All of the cogl-vector API is currently experimental so we
- * suffix the actual symbols with _EXP so if somone is monitoring for
- * ABI changes it will hopefully be clearer to them what's going on if
- * any of the symbols dissapear at a later date.
- */
-#define cogl_vector3_init cogl_vector3_init_EXP
-#define cogl_vector3_init_zero cogl_vector3_init_zero_EXP
-#define cogl_vector3_equal cogl_vector3_equal_EXP
-#define cogl_vector3_equal_with_epsilon cogl_vector3_equal_with_epsilon_EXP
-#define cogl_vector3_copy cogl_vector3_copy_EXP
-#define cogl_vector3_free cogl_vector3_free_EXP
-#define cogl_vector3_invert cogl_vector3_invert_EXP
-#define cogl_vector3_add cogl_vector3_add_EXP
-#define cogl_vector3_subtract cogl_vector3_subtract_EXP
-#define cogl_vector3_multiply_scalar cogl_vector3_multiply_scalar_EXP
-#define cogl_vector3_divide_scalar cogl_vector3_divide_scalar_EXP
-#define cogl_vector3_normalize cogl_vector3_normalize_EXP
-#define cogl_vector3_magnitude cogl_vector3_magnitude_EXP
-#define cogl_vector3_cross_product cogl_vector3_cross_product_EXP
-#define cogl_vector3_dot_product cogl_vector3_dot_product_EXP
-#define cogl_vector3_distance cogl_vector3_distance_EXP
-
-typedef struct
-{
-  /* FIXME: add sse alignment constraint? */
-  float x;
-  float y;
-  float z;
-} CoglVector3;
-
-#if 0
-typedef struct
-{
-  /* FIXME: add sse alignment constraint? */
-  float x;
-  float y;
-  float z;
-  float w;
-} CoglVector4;
-#endif
-
 /**
  * cogl_vector3_init:
- * @vector: The CoglVector3 you want to initialize
+ * @vector: The 3 component vector you want to initialize
  * @x: The x component
  * @y: The y component
  * @z: The z component
@@ -100,11 +59,11 @@ typedef struct
  * Stability: Unstable
  */
 void
-cogl_vector3_init (CoglVector3 *vector, float x, float y, float z);
+cogl_vector3_init (float *vector, float x, float y, float z);
 
 /**
  * cogl_vector3_init_zero:
- * @vector: The CoglVector3 you want to initialize
+ * @vector: The 3 component vector you want to initialize
  *
  * Initializes a 3 component, single precision float vector with zero
  * for each component.
@@ -113,12 +72,12 @@ cogl_vector3_init (CoglVector3 *vector, float x, float y, float z);
  * Stability: Unstable
  */
 void
-cogl_vector3_init_zero (CoglVector3 *vector);
+cogl_vector3_init_zero (float *vector);
 
 /**
  * cogl_vector3_equal:
- * @v1: The first CoglVector3 you want to compare
- * @v2: The second CoglVector3 you want to compare
+ * @v1: The first 3 component vector you want to compare
+ * @v2: The second 3 component vector you want to compare
  *
  * Compares the components of two vectors and returns TRUE if they are
  * the same.
@@ -139,8 +98,8 @@ cogl_vector3_equal (gconstpointer v1, gconstpointer v2);
 
 /**
  * cogl_vector3_equal_with_epsilon:
- * @vector0: The first CoglVector3 you want to compare
- * @vector1: The second CoglVector3 you want to compare
+ * @vector0: The first 3 component vector you want to compare
+ * @vector1: The second 3 component vector you want to compare
  * @epsilon: The allowable difference between components to still be
  *           considered equal
  *
@@ -159,43 +118,43 @@ cogl_vector3_equal (gconstpointer v1, gconstpointer v2);
  * Stability: Unstable
  */
 gboolean
-cogl_vector3_equal_with_epsilon (const CoglVector3 *vector0,
-                                 const CoglVector3 *vector1,
+cogl_vector3_equal_with_epsilon (const float *vector0,
+                                 const float *vector1,
                                  float epsilon);
 
 /**
  * cogl_vector3_copy:
- * @vector: The CoglVector3 you want to copy
+ * @vector: The 3 component vector you want to copy
  *
- * Allocates a new #CoglVector3 structure on the heap initializing the
- * components from the given @vector and returns a pointer to the newly
- * allocated vector. You should free the memory using
+ * Allocates a new 3 component float vector on the heap initializing
+ * the components from the given @vector and returns a pointer to the
+ * newly allocated vector. You should free the memory using
  * cogl_vector3_free()
  *
- * Returns: A newly allocated #CoglVector3.
+ * Returns: A newly allocated 3 component float vector
  *
  * Since: 1.4
  * Stability: Unstable
  */
-CoglVector3 *
-cogl_vector3_copy (const CoglVector3 *vector);
+float *
+cogl_vector3_copy (const float *vector);
 
 /**
  * cogl_vector3_free:
- * @vector: The CoglVector3 you want to free
+ * @vector: The 3 component you want to free
  *
- * Frees a #CoglVector3 that was previously allocated with
+ * Frees a 3 component vector that was previously allocated with
  * cogl_vector_copy()
  *
  * Since: 1.4
  * Stability: Unstable
  */
 void
-cogl_vector3_free (CoglVector3 *vector);
+cogl_vector3_free (float *vector);
 
 /**
  * cogl_vector3_invert:
- * @vector: The CoglVector3 you want to manipulate
+ * @vector: The 3 component vector you want to manipulate
  *
  * Inverts/negates all the components of the given @vector.
  *
@@ -203,7 +162,7 @@ cogl_vector3_free (CoglVector3 *vector);
  * Stability: Unstable
  */
 void
-cogl_vector3_invert (CoglVector3 *vector);
+cogl_vector3_invert (float *vector);
 
 /**
  * cogl_vector3_add:
@@ -218,9 +177,9 @@ cogl_vector3_invert (CoglVector3 *vector);
  * Stability: Unstable
  */
 void
-cogl_vector3_add (CoglVector3 *result,
-                  const CoglVector3 *a,
-                  const CoglVector3 *b);
+cogl_vector3_add (float *result,
+                  const float *a,
+                  const float *b);
 
 /**
  * cogl_vector3_subtract:
@@ -235,13 +194,13 @@ cogl_vector3_add (CoglVector3 *result,
  * Stability: Unstable
  */
 void
-cogl_vector3_subtract (CoglVector3 *result,
-                       const CoglVector3 *a,
-                       const CoglVector3 *b);
+cogl_vector3_subtract (float *result,
+                       const float *a,
+                       const float *b);
 
 /**
  * cogl_vector3_multiply_scalar:
- * @vector: The CoglVector3 you want to manipulate
+ * @vector: The 3 component vector you want to manipulate
  * @scalar: The scalar you want to multiply the vector components by
  *
  * Multiplies each of the @vector components by the given scalar.
@@ -250,12 +209,12 @@ cogl_vector3_subtract (CoglVector3 *result,
  * Stability: Unstable
  */
 void
-cogl_vector3_multiply_scalar (CoglVector3 *vector,
+cogl_vector3_multiply_scalar (float *vector,
                               float scalar);
 
 /**
  * cogl_vector3_divide_scalar:
- * @vector: The CoglVector3 you want to manipulate
+ * @vector: The 3 component vector you want to manipulate
  * @scalar: The scalar you want to divide the vector components by
  *
  * Divides each of the @vector components by the given scalar.
@@ -264,12 +223,12 @@ cogl_vector3_multiply_scalar (CoglVector3 *vector,
  * Stability: Unstable
  */
 void
-cogl_vector3_divide_scalar (CoglVector3 *vector,
+cogl_vector3_divide_scalar (float *vector,
                             float scalar);
 
 /**
  * cogl_vector3_normalize:
- * @vector: The CoglVector3 you want to manipulate
+ * @vector: The 3 component vector you want to manipulate
  *
  * Updates the vector so it is a "unit vector" such that the
  * @vector<!-- -->s magnitude or length is equal to 1.
@@ -278,11 +237,11 @@ cogl_vector3_divide_scalar (CoglVector3 *vector,
  * Stability: Unstable
  */
 void
-cogl_vector3_normalize (CoglVector3 *vector);
+cogl_vector3_normalize (float *vector);
 
 /**
  * cogl_vector3_magnitude:
- * @vector: The CoglVector3 you want the magnitude for
+ * @vector: The 3 component vector you want the magnitude for
  *
  * Calculates the scalar magnitude or length of @vector.
  *
@@ -292,13 +251,13 @@ cogl_vector3_normalize (CoglVector3 *vector);
  * Stability: Unstable
  */
 float
-cogl_vector3_magnitude (const CoglVector3 *vector);
+cogl_vector3_magnitude (const float *vector);
 
 /**
  * cogl_vector3_cross_product:
  * @result: Where you want the result written
- * @u: Your first CoglVector3
- * @v: Your second CoglVector3
+ * @u: Your first 3 component vector
+ * @v: Your second 3 component vector
  *
  * Calculates the cross product between the two vectors @u and @v.
  *
@@ -322,16 +281,16 @@ cogl_vector3_magnitude (const CoglVector3 *vector);
  * Stability: Unstable
  */
 void
-cogl_vector3_cross_product (CoglVector3 *result,
-                            const CoglVector3 *u,
-                            const CoglVector3 *v);
+cogl_vector3_cross_product (float *result,
+                            const float *u,
+                            const float *v);
 
 /**
  * cogl_vector3_dot_product:
- * @a: Your first CoglVector3
- * @b: Your second CoglVector3
+ * @a: Your first 3 component vector
+ * @b: Your second 3 component vector
  *
- * Calculates the dot product of the two #CoglVector3<!-- -->s. This
+ * Calculates the dot product of the two 3 component vectors. This
  * can be used to determine the magnitude of one vector projected onto
  * another. (for example a surface normal)
  *
@@ -365,7 +324,7 @@ cogl_vector3_cross_product (CoglVector3 *result,
  * Stability: Unstable
  */
 float
-cogl_vector3_dot_product (const CoglVector3 *a, const CoglVector3 *b);
+cogl_vector3_dot_product (const float *a, const float *b);
 
 /**
  * cogl_vector3_distance:
@@ -375,13 +334,14 @@ cogl_vector3_dot_product (const CoglVector3 *a, const CoglVector3 *b);
  * If you consider the two given vectors as (x,y,z) points instead
  * then this will compute the distance between those two points.
  *
- * Returns: The distance between two points given as @CoglVector3<!-- -->s
+ * Returns: The distance between two points given as 3 component
+ *          vectors.
  *
  * Since: 1.4
  * Stability: Unstable
  */
 float
-cogl_vector3_distance (const CoglVector3 *a, const CoglVector3 *b);
+cogl_vector3_distance (const float *a, const float *b);
 
 G_END_DECLS