New inline function framework.

1 files changed, 87 insertions, 18 deletions

diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index 9ddfbd9..2f08012 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -25,6 +25,8 @@
 #ifndef DIMENSION_GEOMETRY_H
 #define DIMENSION_GEOMETRY_H
 
+#include <math.h>
+
 /* Vector and matrix types. */
 
 typedef struct { double x, y, z; } dmnsn_vector;
@@ -39,12 +41,25 @@ typedef struct {
 
 /* Shorthand for vector/matrix construction */
 
-dmnsn_vector dmnsn_vector_construct(double x, double y, double z);
-
-dmnsn_matrix dmnsn_matrix_construct(double a0, double a1, double a2, double a3,
-                                    double b0, double b1, double b2, double b3,
-                                    double c0, double c1, double c2, double c3,
-                                    double d0, double d1, double d2, double d3);
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_construct(double x, double y, double z)
+{
+  dmnsn_vector v = { x, y, z };
+  return v;
+}
+
+DMNSN_INLINE dmnsn_matrix
+dmnsn_matrix_construct(double a0, double a1, double a2, double a3,
+                       double b0, double b1, double b2, double b3,
+                       double c0, double c1, double c2, double c3,
+                       double d0, double d1, double d2, double d3)
+{
+  dmnsn_matrix m = { { { a0, a1, a2, a3 },
+                       { b0, b1, b2, b3 },
+                       { c0, c1, c2, c3 },
+                       { d0, d1, d2, d3 } } };
+  return m;
+}
 
 dmnsn_matrix dmnsn_identity_matrix();
 dmnsn_matrix dmnsn_scale_matrix(dmnsn_vector s);
@@ -52,20 +67,69 @@ dmnsn_matrix dmnsn_translation_matrix(dmnsn_vector d);
 /* Left-handed rotation; theta/|theta| = axis, |theta| = angle */
 dmnsn_matrix dmnsn_rotation_matrix(dmnsn_vector theta);
 
-dmnsn_line dmnsn_line_construct(dmnsn_vector x0, dmnsn_vector n);
+DMNSN_INLINE dmnsn_line
+dmnsn_line_construct(dmnsn_vector x0, dmnsn_vector n)
+{
+  dmnsn_line l = { x0, n };
+  return l;
+}
 
 /* Vector and matrix arithmetic */
 
-dmnsn_vector dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs);
-dmnsn_vector dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs);
-dmnsn_vector dmnsn_vector_mul(double lhs, dmnsn_vector rhs);
-dmnsn_vector dmnsn_vector_div(dmnsn_vector lhs, double rhs);
-
-double       dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs);
-dmnsn_vector dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs);
-
-double       dmnsn_vector_norm(dmnsn_vector n);
-dmnsn_vector dmnsn_vector_normalize(dmnsn_vector n);
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  dmnsn_vector v = { lhs.x + rhs.x, lhs.y + rhs.y, lhs.z + rhs.z };
+  return v;
+}
+
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  dmnsn_vector v = { lhs.x - rhs.x, lhs.y - rhs.y, lhs.z - rhs.z };
+  return v;
+}
+
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_mul(double lhs, dmnsn_vector rhs)
+{
+  dmnsn_vector v = { lhs*rhs.x, lhs*rhs.y, lhs*rhs.z };
+  return v;
+}
+
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_div(dmnsn_vector lhs, double rhs)
+{
+  dmnsn_vector v = { lhs.x/rhs, lhs.y/rhs, lhs.z/rhs };
+  return v;
+}
+
+DMNSN_INLINE double
+dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  return lhs.x*rhs.x + lhs.y*rhs.y + lhs.z*rhs.z;
+}
+
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  dmnsn_vector v = { lhs.y*rhs.z - lhs.z*rhs.y,
+                     lhs.z*rhs.x - lhs.x*rhs.z,
+                     lhs.x*rhs.y - lhs.y*rhs.x };
+  return v;
+}
+
+DMNSN_INLINE double
+dmnsn_vector_norm(dmnsn_vector n)
+{
+  return sqrt(dmnsn_vector_dot(n, n));
+}
+
+DMNSN_INLINE dmnsn_vector
+dmnsn_vector_normalize(dmnsn_vector n)
+{
+  return dmnsn_vector_div(n, dmnsn_vector_norm(n));
+}
 
 dmnsn_matrix dmnsn_matrix_inverse(dmnsn_matrix A);
 dmnsn_matrix dmnsn_matrix_mul(dmnsn_matrix lhs, dmnsn_matrix rhs);
@@ -73,7 +137,12 @@ dmnsn_vector dmnsn_matrix_vector_mul(dmnsn_matrix lhs, dmnsn_vector rhs);
 dmnsn_line   dmnsn_matrix_line_mul(dmnsn_matrix lhs, dmnsn_line rhs);
 
 /* A point on a line, defined by x0 + t*n */
-dmnsn_vector dmnsn_line_point(dmnsn_line l, double t);
+DMNSN_INLINE dmnsn_vector
+dmnsn_line_point(dmnsn_line l, double t)
+{
+  return dmnsn_vector_add(l.x0, dmnsn_vector_mul(t, l.n));
+}
+
 /* Solve for the t value such that x0 + t*n = x */
 double dmnsn_line_index(dmnsn_line l, dmnsn_vector x);