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-rw-r--r--libdimension/triangle.c40
1 files changed, 20 insertions, 20 deletions
diff --git a/libdimension/triangle.c b/libdimension/triangle.c
index 0e6daf4..9ddc3fc 100644
--- a/libdimension/triangle.c
+++ b/libdimension/triangle.c
@@ -25,16 +25,18 @@
#include "dimension.h"
-typedef struct dmnsn_triangle_payload {
+/** Triangle type. */
+typedef struct {
+ dmnsn_object object;
dmnsn_vector na, nab, nac;
-} dmnsn_triangle_payload;
+} dmnsn_triangle;
/** Triangle intersection callback. */
static bool
-dmnsn_triangle_intersection_fn(const dmnsn_object *triangle, dmnsn_line l,
+dmnsn_triangle_intersection_fn(const dmnsn_object *object, dmnsn_line l,
dmnsn_intersection *intersection)
{
- const dmnsn_triangle_payload *payload = triangle->ptr;
+ const dmnsn_triangle *triangle = (const dmnsn_triangle *)object;
/* See the change of basis in dmnsn_new_triangle() */
double t = -l.x0.z/l.n.z;
@@ -43,10 +45,10 @@ dmnsn_triangle_intersection_fn(const dmnsn_object *triangle, dmnsn_line l,
if (t >= 0.0 && u >= 0.0 && v >= 0.0 && u + v <= 1.0) {
intersection->t = t;
intersection->normal = dmnsn_vector_add(
- payload->na,
+ triangle->na,
dmnsn_vector_add(
- dmnsn_vector_mul(u, payload->nab),
- dmnsn_vector_mul(v, payload->nac)
+ dmnsn_vector_mul(u, triangle->nab),
+ dmnsn_vector_mul(v, triangle->nac)
)
);
return true;
@@ -71,18 +73,16 @@ dmnsn_new_triangle(dmnsn_vector a, dmnsn_vector b, dmnsn_vector c,
nb = dmnsn_vector_normalized(nb);
nc = dmnsn_vector_normalized(nc);
- dmnsn_triangle_payload *payload = DMNSN_MALLOC(dmnsn_triangle_payload);
- payload->na = na;
- payload->nab = dmnsn_vector_sub(nb, na);
- payload->nac = dmnsn_vector_sub(nc, na);
+ dmnsn_triangle *triangle = DMNSN_MALLOC(dmnsn_triangle);
+ triangle->na = na;
+ triangle->nab = dmnsn_vector_sub(nb, na);
+ triangle->nac = dmnsn_vector_sub(nc, na);
- dmnsn_object *triangle = dmnsn_new_object();
- triangle->ptr = payload;
- triangle->intersection_fn = dmnsn_triangle_intersection_fn;
- triangle->inside_fn = dmnsn_triangle_inside_fn;
- triangle->free_fn = dmnsn_free;
- triangle->bounding_box.min = dmnsn_zero;
- triangle->bounding_box.max = dmnsn_new_vector(1.0, 1.0, 0.0);
+ dmnsn_init_object(&triangle->object);
+ triangle->object.intersection_fn = dmnsn_triangle_intersection_fn;
+ triangle->object.inside_fn = dmnsn_triangle_inside_fn;
+ triangle->object.bounding_box.min = dmnsn_zero;
+ triangle->object.bounding_box.max = dmnsn_new_vector(1.0, 1.0, 0.0);
/*
* Make a change-of-basis matrix
@@ -93,9 +93,9 @@ dmnsn_new_triangle(dmnsn_vector a, dmnsn_vector b, dmnsn_vector c,
dmnsn_vector ab = dmnsn_vector_sub(b, a);
dmnsn_vector ac = dmnsn_vector_sub(c, a);
dmnsn_vector normal = dmnsn_vector_cross(ab, ac);
- triangle->intrinsic_trans = dmnsn_new_matrix4(ab, ac, normal, a);
+ triangle->object.intrinsic_trans = dmnsn_new_matrix4(ab, ac, normal, a);
- return triangle;
+ return &triangle->object;
}
/* Allocate a new flat triangle */