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-rw-r--r--bench/libdimension/bvst.c15
-rw-r--r--libdimension/bvst.c51
-rw-r--r--libdimension/bvst.h3
-rw-r--r--libdimension/csg.c322
-rw-r--r--libdimension/cube.c17
-rw-r--r--libdimension/dimension/object.h10
-rw-r--r--libdimension/object.c15
-rw-r--r--libdimension/raytrace.c24
-rw-r--r--libdimension/sphere.c16
9 files changed, 231 insertions, 242 deletions
diff --git a/bench/libdimension/bvst.c b/bench/libdimension/bvst.c
index de568d5..dd61a80 100644
--- a/bench/libdimension/bvst.c
+++ b/bench/libdimension/bvst.c
@@ -21,13 +21,13 @@
#include <sandglass.h>
#include <stdlib.h>
-dmnsn_intersection *
-dmnsn_fake_intersection_fn(const dmnsn_object *object, dmnsn_line line)
+bool
+dmnsn_fake_intersection_fn(const dmnsn_object *object, dmnsn_line line,
+ dmnsn_intersection *intersection)
{
- dmnsn_intersection *intersection = dmnsn_new_intersection();
intersection->t = (object->bounding_box.min.z - line.x0.z)/line.n.z;
intersection->texture = object->texture;
- return intersection;
+ return true;
}
void
@@ -104,7 +104,7 @@ main()
{
dmnsn_bvst *tree;
dmnsn_bvst_node *node;
- dmnsn_intersection *intersection;
+ dmnsn_intersection intersection;
dmnsn_line ray;
const unsigned int nobjects = 128;
dmnsn_object *objects[nobjects];
@@ -144,11 +144,10 @@ main()
ray.x0 = dmnsn_new_vector(0.0, 0.0, -2.0);
ray.n = dmnsn_new_vector(0.0, 0.0, 1.0);
- dmnsn_delete_intersection((*objects[0]->intersection_fn)(objects[0], ray));
+ (*objects[0]->intersection_fn)(objects[0], ray, &intersection);
sandglass_bench_noprecache(&sandglass, {
- intersection = dmnsn_bvst_search(tree, ray);
+ dmnsn_bvst_search(tree, ray, &intersection);
});
- dmnsn_delete_intersection(intersection);
printf("dmnsn_bvst_search(): %ld\n", sandglass.grains);
/* dmnsn_bvst_splay() */
diff --git a/libdimension/bvst.c b/libdimension/bvst.c
index 958273d..9f9e94b 100644
--- a/libdimension/bvst.c
+++ b/libdimension/bvst.c
@@ -255,22 +255,26 @@ dmnsn_bvst_rotate(dmnsn_bvst_node *node)
typedef struct {
dmnsn_bvst_node *node;
- dmnsn_intersection *intersection;
+ bool intersected;
+ dmnsn_intersection intersection;
} dmnsn_bvst_search_result;
static dmnsn_bvst_search_result
dmnsn_bvst_search_recursive(dmnsn_bvst_node *node, dmnsn_line ray, double t);
-dmnsn_intersection *
-dmnsn_bvst_search(dmnsn_bvst *tree, dmnsn_line ray)
+bool
+dmnsn_bvst_search(dmnsn_bvst *tree, dmnsn_line ray,
+ dmnsn_intersection *intersection)
{
dmnsn_bvst_search_result result
= dmnsn_bvst_search_recursive(tree->root, ray, -1.0);
- if (result.node)
+ if (result.intersected) {
dmnsn_bvst_splay(tree, result.node);
+ *intersection = result.intersection;
+ }
- return result.intersection;
+ return result.intersected;
}
static bool dmnsn_ray_box_intersection(dmnsn_line ray, dmnsn_bounding_box box,
@@ -280,7 +284,10 @@ static dmnsn_bvst_search_result
dmnsn_bvst_search_recursive(dmnsn_bvst_node *node, dmnsn_line ray, double t)
{
dmnsn_line ray_trans;
- dmnsn_bvst_search_result result = { NULL, NULL }, result_temp;
+ dmnsn_bvst_search_result result_temp, result = {
+ .node = NULL,
+ .intersected = false
+ };
if (!node)
return result;
@@ -288,11 +295,9 @@ dmnsn_bvst_search_recursive(dmnsn_bvst_node *node, dmnsn_line ray, double t)
/* Go down the right subtree first because the closest object is more likely
to lie in the larger bounding boxes */
result_temp = dmnsn_bvst_search_recursive(node->container, ray, t);
- if (result_temp.node && (t < 0.0 || result_temp.intersection->t < t)) {
+ if (result_temp.node && (t < 0.0 || result_temp.intersection.t < t)) {
result = result_temp;
- t = result.intersection->t;
- } else {
- dmnsn_delete_intersection(result_temp.intersection);
+ t = result.intersection.t;
}
if (dmnsn_bounding_box_contains(node->bounding_box, ray.x0)
@@ -304,23 +309,24 @@ dmnsn_bvst_search_recursive(dmnsn_bvst_node *node, dmnsn_line ray, double t)
if (dmnsn_bounding_box_contains(node->object->bounding_box, ray_trans.x0)
|| dmnsn_ray_box_intersection(ray_trans, node->object->bounding_box, t))
{
- result_temp.intersection =
- (*node->object->intersection_fn)(node->object, ray_trans);
+ result_temp.intersected =
+ (*node->object->intersection_fn)(node->object, ray_trans,
+ &result_temp.intersection);
- if (result_temp.intersection
- && (t < 0.0 || result_temp.intersection->t < t)) {
- dmnsn_delete_intersection(result.intersection);
+ if (result_temp.intersected
+ && (t < 0.0 || result_temp.intersection.t < t)) {
result.node = node;
+ result.intersected = true;
result.intersection = result_temp.intersection;
- t = result.intersection->t;
+ t = result.intersection.t;
/* Transform the intersection back to the observer's view */
- result.intersection->ray = ray;
- result.intersection->normal = dmnsn_vector_normalize(
+ result.intersection.ray = ray;
+ result.intersection.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
dmnsn_matrix_vector_mul(
node->object->trans,
- result.intersection->normal
+ result.intersection.normal
),
dmnsn_matrix_vector_mul(
node->object->trans,
@@ -328,18 +334,13 @@ dmnsn_bvst_search_recursive(dmnsn_bvst_node *node, dmnsn_line ray, double t)
)
)
);
- } else {
- dmnsn_delete_intersection(result_temp.intersection);
}
}
/* Go down the left subtree */
result_temp = dmnsn_bvst_search_recursive(node->contains, ray, t);
- if (result_temp.node && (t < 0.0 || result_temp.intersection->t < t)) {
- dmnsn_delete_intersection(result.intersection);
+ if (result_temp.node && (t < 0.0 || result_temp.intersection.t < t)) {
result = result_temp;
- } else {
- dmnsn_delete_intersection(result_temp.intersection);
}
}
diff --git a/libdimension/bvst.h b/libdimension/bvst.h
index e682b2c..d300cf9 100644
--- a/libdimension/bvst.h
+++ b/libdimension/bvst.h
@@ -60,6 +60,7 @@ void dmnsn_delete_bvst(dmnsn_bvst *tree);
void dmnsn_bvst_insert(dmnsn_bvst *tree, dmnsn_object *object);
void dmnsn_bvst_splay(dmnsn_bvst *tree, dmnsn_bvst_node *node);
-dmnsn_intersection *dmnsn_bvst_search(dmnsn_bvst *tree, dmnsn_line ray);
+bool dmnsn_bvst_search(dmnsn_bvst *tree, dmnsn_line ray,
+ dmnsn_intersection *intersection);
#endif /* DIMENSION_IMPL_BVST_H */
diff --git a/libdimension/csg.c b/libdimension/csg.c
index 24f1f80..4619759 100644
--- a/libdimension/csg.c
+++ b/libdimension/csg.c
@@ -32,59 +32,63 @@ dmnsn_csg_free_fn(void *ptr)
/* Unions */
-static dmnsn_intersection *
-dmnsn_csg_union_intersection_fn(const dmnsn_object *csg, dmnsn_line line)
+static bool
+dmnsn_csg_union_intersection_fn(const dmnsn_object *csg,
+ dmnsn_line line,
+ dmnsn_intersection *intersection)
{
const dmnsn_object **params = csg->ptr;
dmnsn_line line1 = dmnsn_matrix_line_mul(params[0]->trans_inv, line);
dmnsn_line line2 = dmnsn_matrix_line_mul(params[1]->trans_inv, line);
- dmnsn_intersection *i1 = (*params[0]->intersection_fn)(params[0], line1);
- dmnsn_intersection *i2 = (*params[1]->intersection_fn)(params[1], line2);
- if (i1) {
+ dmnsn_intersection i1, i2;
+ bool is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
+ bool is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
+
+ if (is_i1) {
/* Transform the intersection back to the observer's view */
- i1->ray = line;
- i1->normal = dmnsn_vector_normalize(
+ i1.ray = line;
+ i1.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[0]->trans, i1->normal),
+ dmnsn_matrix_vector_mul(params[0]->trans, i1.normal),
dmnsn_matrix_vector_mul(params[0]->trans, dmnsn_zero)
)
);
- if (!i1->texture)
- i1->texture = csg->texture;
- if (!i1->interior)
- i1->interior = csg->interior;
+ if (!i1.texture)
+ i1.texture = csg->texture;
+ if (!i1.interior)
+ i1.interior = csg->interior;
}
- if (i2) {
- i2->ray = line;
- i2->normal = dmnsn_vector_normalize(
+ if (is_i2) {
+ i2.ray = line;
+ i2.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[1]->trans, i2->normal),
+ dmnsn_matrix_vector_mul(params[1]->trans, i2.normal),
dmnsn_matrix_vector_mul(params[1]->trans, dmnsn_zero)
)
);
- if (!i2->texture)
- i2->texture = csg->texture;
- if (!i2->interior)
- i2->interior = csg->interior;
+ if (!i2.texture)
+ i2.texture = csg->texture;
+ if (!i2.interior)
+ i2.interior = csg->interior;
}
- if (!i1)
- return i2;
- if (!i2)
- return i1;
-
- if (i1->t < i2->t) {
- dmnsn_delete_intersection(i2);
- return i1;
+ if (!is_i1 && !is_i2) {
+ return false;
+ } else if (is_i1 && !is_i2) {
+ *intersection = i1;
+ } else if (!is_i1 && is_i2) {
+ *intersection = i2;
+ } else if (i1.t < i2.t) {
+ *intersection = i1;
} else {
- dmnsn_delete_intersection(i1);
- return i2;
+ *intersection = i2;
}
+ return true;
}
static bool
@@ -124,86 +128,88 @@ dmnsn_new_csg_union(dmnsn_object *A, dmnsn_object *B)
/* Intersections */
-static dmnsn_intersection *
-dmnsn_csg_intersection_intersection_fn(const dmnsn_object *csg, dmnsn_line line)
+static bool
+dmnsn_csg_intersection_intersection_fn(const dmnsn_object *csg,
+ dmnsn_line line,
+ dmnsn_intersection *intersection)
{
const dmnsn_object **params = csg->ptr;
dmnsn_line line1 = dmnsn_matrix_line_mul(params[0]->trans_inv, line);
dmnsn_line line2 = dmnsn_matrix_line_mul(params[1]->trans_inv, line);
- dmnsn_intersection *i1 = (*params[0]->intersection_fn)(params[0], line1);
- dmnsn_intersection *i2 = (*params[1]->intersection_fn)(params[1], line2);
+
+ dmnsn_intersection i1, i2;
+ bool is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
+ bool is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
double oldt = 0.0;
- while (i1) {
- i1->ray = line;
- i1->t += oldt;
- oldt = i1->t;
- i1->normal = dmnsn_vector_normalize(
+ while (is_i1) {
+ i1.ray = line;
+ i1.t += oldt;
+ oldt = i1.t;
+ i1.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[0]->trans, i1->normal),
+ dmnsn_matrix_vector_mul(params[0]->trans, i1.normal),
dmnsn_matrix_vector_mul(params[0]->trans, dmnsn_zero)
)
);
- if (!i1->texture)
- i1->texture = csg->texture;
- if (!i1->interior)
- i1->interior = csg->interior;
+ if (!i1.texture)
+ i1.texture = csg->texture;
+ if (!i1.interior)
+ i1.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i1->ray, i1->t);
+ dmnsn_vector point = dmnsn_line_point(i1.ray, i1.t);
point = dmnsn_matrix_vector_mul(params[1]->trans_inv, point);
if (!(*params[1]->inside_fn)(params[1], point)) {
- line1.x0 = dmnsn_line_point(line1, i1->t);
+ line1.x0 = dmnsn_line_point(line1, i1.t);
line1 = dmnsn_line_add_epsilon(line1);
- dmnsn_delete_intersection(i1);
- i1 = (*params[0]->intersection_fn)(params[0], line1);
+ is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
} else {
break;
}
}
oldt = 0.0;
- while (i2) {
- i2->ray = line;
- i2->t += oldt;
- oldt = i2->t;
- i2->normal = dmnsn_vector_normalize(
+ while (is_i2) {
+ i2.ray = line;
+ i2.t += oldt;
+ oldt = i2.t;
+ i2.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[1]->trans, i2->normal),
+ dmnsn_matrix_vector_mul(params[1]->trans, i2.normal),
dmnsn_matrix_vector_mul(params[1]->trans, dmnsn_zero)
)
);
- if (!i2->texture)
- i2->texture = csg->texture;
- if (!i2->interior)
- i2->interior = csg->interior;
+ if (!i2.texture)
+ i2.texture = csg->texture;
+ if (!i2.interior)
+ i2.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i2->ray, i2->t);
+ dmnsn_vector point = dmnsn_line_point(i2.ray, i2.t);
point = dmnsn_matrix_vector_mul(params[0]->trans_inv, point);
if (!(*params[0]->inside_fn)(params[0], point)) {
- line2.x0 = dmnsn_line_point(line2, i2->t);
+ line2.x0 = dmnsn_line_point(line2, i2.t);
line2 = dmnsn_line_add_epsilon(line2);
- dmnsn_delete_intersection(i2);
- i2 = (*params[1]->intersection_fn)(params[1], line2);
+ is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
} else {
break;
}
}
- if (!i1)
- return i2;
- if (!i2)
- return i1;
-
- if (i1->t < i2->t) {
- dmnsn_delete_intersection(i2);
- return i1;
+ if (!is_i1 && !is_i2) {
+ return false;
+ } else if (is_i1 && !is_i2) {
+ *intersection = i1;
+ } else if (!is_i1 && is_i2) {
+ *intersection = i2;
+ } else if (i1.t < i2.t) {
+ *intersection = i1;
} else {
- dmnsn_delete_intersection(i1);
- return i2;
+ *intersection = i2;
}
+ return true;
}
static bool
@@ -243,86 +249,88 @@ dmnsn_new_csg_intersection(dmnsn_object *A, dmnsn_object *B)
/* Differences */
-static dmnsn_intersection *
-dmnsn_csg_difference_intersection_fn(const dmnsn_object *csg, dmnsn_line line)
+static bool
+dmnsn_csg_difference_intersection_fn(const dmnsn_object *csg,
+ dmnsn_line line,
+ dmnsn_intersection *intersection)
{
const dmnsn_object **params = csg->ptr;
dmnsn_line line1 = dmnsn_matrix_line_mul(params[0]->trans_inv, line);
dmnsn_line line2 = dmnsn_matrix_line_mul(params[1]->trans_inv, line);
- dmnsn_intersection *i1 = (*params[0]->intersection_fn)(params[0], line1);
- dmnsn_intersection *i2 = (*params[1]->intersection_fn)(params[1], line2);
+
+ dmnsn_intersection i1, i2;
+ bool is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
+ bool is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
double oldt = 0.0;
- while (i1) {
- i1->ray = line;
- i1->t += oldt;
- oldt = i1->t;
- i1->normal = dmnsn_vector_normalize(
+ while (is_i1) {
+ i1.ray = line;
+ i1.t += oldt;
+ oldt = i1.t;
+ i1.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[0]->trans, i1->normal),
+ dmnsn_matrix_vector_mul(params[0]->trans, i1.normal),
dmnsn_matrix_vector_mul(params[0]->trans, dmnsn_zero)
)
);
- if (!i1->texture)
- i1->texture = csg->texture;
- if (!i1->interior)
- i1->interior = csg->interior;
+ if (!i1.texture)
+ i1.texture = csg->texture;
+ if (!i1.interior)
+ i1.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i1->ray, i1->t);
+ dmnsn_vector point = dmnsn_line_point(i1.ray, i1.t);
point = dmnsn_matrix_vector_mul(params[1]->trans_inv, point);
if ((*params[1]->inside_fn)(params[1], point)) {
- line1.x0 = dmnsn_line_point(line1, i1->t);
+ line1.x0 = dmnsn_line_point(line1, i1.t);
line1 = dmnsn_line_add_epsilon(line1);
- dmnsn_delete_intersection(i1);
- i1 = (*params[0]->intersection_fn)(params[0], line1);
+ is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
} else {
break;
}
}
oldt = 0.0;
- while (i2) {
- i2->ray = line;
- i2->t += oldt;
- oldt = i2->t;
- i2->normal = dmnsn_vector_normalize(
+ while (is_i2) {
+ i2.ray = line;
+ i2.t += oldt;
+ oldt = i2.t;
+ i2.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[1]->trans, i2->normal),
+ dmnsn_matrix_vector_mul(params[1]->trans, i2.normal),
dmnsn_matrix_vector_mul(params[1]->trans, dmnsn_zero)
)
);
- if (!i2->texture)
- i2->texture = csg->texture;
- if (!i2->interior)
- i2->interior = csg->interior;
+ if (!i2.texture)
+ i2.texture = csg->texture;
+ if (!i2.interior)
+ i2.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i2->ray, i2->t);
+ dmnsn_vector point = dmnsn_line_point(i2.ray, i2.t);
point = dmnsn_matrix_vector_mul(params[0]->trans_inv, point);
if (!(*params[0]->inside_fn)(params[0], point)) {
- line2.x0 = dmnsn_line_point(line2, i2->t);
+ line2.x0 = dmnsn_line_point(line2, i2.t);
line2 = dmnsn_line_add_epsilon(line2);
- dmnsn_delete_intersection(i2);
- i2 = (*params[1]->intersection_fn)(params[1], line2);
+ is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
} else {
break;
}
}
- if (!i1)
- return i2;
- if (!i2)
- return i1;
-
- if (i1->t < i2->t) {
- dmnsn_delete_intersection(i2);
- return i1;
+ if (!is_i1 && !is_i2) {
+ return false;
+ } else if (is_i1 && !is_i2) {
+ *intersection = i1;
+ } else if (!is_i1 && is_i2) {
+ *intersection = i2;
+ } else if (i1.t < i2.t) {
+ *intersection = i1;
} else {
- dmnsn_delete_intersection(i1);
- return i2;
+ *intersection = i2;
}
+ return true;
}
static bool
@@ -356,86 +364,88 @@ dmnsn_new_csg_difference(dmnsn_object *A, dmnsn_object *B)
/* Merges */
-static dmnsn_intersection *
-dmnsn_csg_merge_intersection_fn(const dmnsn_object *csg, dmnsn_line line)
+static bool
+dmnsn_csg_merge_intersection_fn(const dmnsn_object *csg,
+ dmnsn_line line,
+ dmnsn_intersection *intersection)
{
const dmnsn_object **params = csg->ptr;
dmnsn_line line1 = dmnsn_matrix_line_mul(params[0]->trans_inv, line);
dmnsn_line line2 = dmnsn_matrix_line_mul(params[1]->trans_inv, line);
- dmnsn_intersection *i1 = (*params[0]->intersection_fn)(params[0], line1);
- dmnsn_intersection *i2 = (*params[1]->intersection_fn)(params[1], line2);
+
+ dmnsn_intersection i1, i2;
+ bool is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
+ bool is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
double oldt = 0.0;
- while (i1) {
- i1->ray = line;
- i1->t += oldt;
- oldt = i1->t;
- i1->normal = dmnsn_vector_normalize(
+ while (is_i1) {
+ i1.ray = line;
+ i1.t += oldt;
+ oldt = i1.t;
+ i1.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[0]->trans, i1->normal),
+ dmnsn_matrix_vector_mul(params[0]->trans, i1.normal),
dmnsn_matrix_vector_mul(params[0]->trans, dmnsn_zero)
)
);
- if (!i1->texture)
- i1->texture = csg->texture;
- if (!i1->interior)
- i1->interior = csg->interior;
+ if (!i1.texture)
+ i1.texture = csg->texture;
+ if (!i1.interior)
+ i1.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i1->ray, i1->t);
+ dmnsn_vector point = dmnsn_line_point(i1.ray, i1.t);
point = dmnsn_matrix_vector_mul(params[1]->trans_inv, point);
if ((*params[1]->inside_fn)(params[1], point)) {
- line1.x0 = dmnsn_line_point(line1, i1->t);
+ line1.x0 = dmnsn_line_point(line1, i1.t);
line1 = dmnsn_line_add_epsilon(line1);
- dmnsn_delete_intersection(i1);
- i1 = (*params[0]->intersection_fn)(params[0], line1);
+ is_i1 = (*params[0]->intersection_fn)(params[0], line1, &i1);
} else {
break;
}
}
oldt = 0.0;
- while (i2) {
- i2->ray = line;
- i2->t += oldt;
- oldt = i2->t;
- i2->normal = dmnsn_vector_normalize(
+ while (is_i2) {
+ i2.ray = line;
+ i2.t += oldt;
+ oldt = i2.t;
+ i2.normal = dmnsn_vector_normalize(
dmnsn_vector_sub(
- dmnsn_matrix_vector_mul(params[1]->trans, i2->normal),
+ dmnsn_matrix_vector_mul(params[1]->trans, i2.normal),
dmnsn_matrix_vector_mul(params[1]->trans, dmnsn_zero)
)
);
- if (!i2->texture)
- i2->texture = csg->texture;
- if (!i2->interior)
- i2->interior = csg->interior;
+ if (!i2.texture)
+ i2.texture = csg->texture;
+ if (!i2.interior)
+ i2.interior = csg->interior;
- dmnsn_vector point = dmnsn_line_point(i2->ray, i2->t);
+ dmnsn_vector point = dmnsn_line_point(i2.ray, i2.t);
point = dmnsn_matrix_vector_mul(params[0]->trans_inv, point);
if ((*params[0]->inside_fn)(params[0], point)) {
- line2.x0 = dmnsn_line_point(line2, i2->t);
+ line2.x0 = dmnsn_line_point(line2, i2.t);
line2 = dmnsn_line_add_epsilon(line2);
- dmnsn_delete_intersection(i2);
- i2 = (*params[1]->intersection_fn)(params[1], line2);
+ is_i2 = (*params[1]->intersection_fn)(params[1], line2, &i2);
} else {
break;
}
}
- if (!i1)
- return i2;
- if (!i2)
- return i1;
-
- if (i1->t < i2->t) {
- dmnsn_delete_intersection(i2);
- return i1;
+ if (!is_i1 && !is_i2) {
+ return false;
+ } else if (is_i1 && !is_i2) {
+ *intersection = i1;
+ } else if (!is_i1 && is_i2) {
+ *intersection = i2;
+ } else if (i1.t < i2.t) {
+ *intersection = i1;
} else {
- dmnsn_delete_intersection(i1);
- return i2;
+ *intersection = i2;
}
+ return true;
}
static bool
diff --git a/libdimension/cube.c b/libdimension/cube.c
index 033d2fb..19c67b9 100644
--- a/libdimension/cube.c
+++ b/libdimension/cube.c
@@ -26,8 +26,9 @@
*/
/* Cube callbacks */
-static dmnsn_intersection *dmnsn_cube_intersection_fn(const dmnsn_object *cube,
- dmnsn_line line);
+static bool dmnsn_cube_intersection_fn(const dmnsn_object *cube,
+ dmnsn_line line,
+ dmnsn_intersection *intersection);
static bool dmnsn_cube_inside_fn(const dmnsn_object *cube,
dmnsn_vector point);
@@ -44,12 +45,12 @@ dmnsn_new_cube()
}
/* Intersections callback for a cube */
-static dmnsn_intersection *
-dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line)
+static bool
+dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line,
+ dmnsn_intersection *intersection)
{
double t = -1.0, t_temp;
dmnsn_vector p, normal;
- dmnsn_intersection *intersection = NULL;
/* Six ray-plane intersection tests (x, y, z) = +/- 1.0 */
@@ -120,15 +121,15 @@ dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line)
}
if (t >= 0.0) {
- intersection = dmnsn_new_intersection();
intersection->ray = line;
intersection->t = t;
intersection->normal = normal;
intersection->texture = cube->texture;
intersection->interior = cube->interior;
+ return true;
+ } else {
+ return false;
}
-
- return intersection;
}
/* Inside callback for a cube */
diff --git a/libdimension/dimension/object.h b/libdimension/dimension/object.h
index 525c637..f0395cd 100644
--- a/libdimension/dimension/object.h
+++ b/libdimension/dimension/object.h
@@ -41,18 +41,14 @@ typedef struct dmnsn_intersection {
const dmnsn_interior *interior;
} dmnsn_intersection;
-/* Intersection allocation cannot fail */
-dmnsn_intersection *dmnsn_new_intersection();
-void dmnsn_delete_intersection(dmnsn_intersection *intersection);
-
/* Forward-declare dmnsn_object */
typedef struct dmnsn_object dmnsn_object;
/* Object callback types */
-typedef dmnsn_intersection *
-dmnsn_object_intersection_fn(const dmnsn_object *object, dmnsn_line line);
-
+typedef bool dmnsn_object_intersection_fn(const dmnsn_object *object,
+ dmnsn_line line,
+ dmnsn_intersection *intersection);
typedef bool dmnsn_object_inside_fn(const dmnsn_object *object,
dmnsn_vector point);
diff --git a/libdimension/object.c b/libdimension/object.c
index 51db42f..bb4a766 100644
--- a/libdimension/object.c
+++ b/libdimension/object.c
@@ -21,21 +21,6 @@
#include "dimension.h"
#include <errno.h>
-/* Allocate an intersection */
-dmnsn_intersection *
-dmnsn_new_intersection()
-{
- dmnsn_intersection *intersection = dmnsn_malloc(sizeof(dmnsn_intersection));
- return intersection;
-}
-
-/* Free an intersection */
-void
-dmnsn_delete_intersection(dmnsn_intersection *intersection)
-{
- free(intersection);
-}
-
/* Allocate a dummy object */
dmnsn_object *
dmnsn_new_object()
diff --git a/libdimension/raytrace.c b/libdimension/raytrace.c
index 812b6a6..9b87364 100644
--- a/libdimension/raytrace.c
+++ b/libdimension/raytrace.c
@@ -286,30 +286,28 @@ dmnsn_raytrace_light_ray(const dmnsn_raytrace_state *state,
unsigned int reclevel = state->reclevel;
while (reclevel) {
- dmnsn_intersection *shadow_caster
- = dmnsn_bvst_search(state->bvst, shadow_ray);
+ dmnsn_intersection shadow_caster;
+ bool shadow_casted
+ = dmnsn_bvst_search(state->bvst, shadow_ray, &shadow_caster);
- if (!shadow_caster || shadow_caster->t > 1.0) {
- dmnsn_delete_intersection(shadow_caster);
+ if (!shadow_casted || shadow_caster.t > 1.0) {
break;
}
dmnsn_raytrace_state shadow_state = *state;
- shadow_state.intersection = shadow_caster;
+ shadow_state.intersection = &shadow_caster;
shadow_state.reclevel = reclevel;
dmnsn_raytrace_pigment(&shadow_state);
if (shadow_state.pigment.filter || shadow_state.pigment.trans) {
color = dmnsn_color_filter(color, shadow_state.pigment);
- shadow_ray.x0 = dmnsn_line_point(shadow_ray, shadow_caster->t);
+ shadow_ray.x0 = dmnsn_line_point(shadow_ray, shadow_caster.t);
shadow_ray.n = dmnsn_vector_sub(light->x0, shadow_ray.x0);
shadow_ray = dmnsn_line_add_epsilon(shadow_ray);
} else {
- dmnsn_delete_intersection(shadow_caster);
return dmnsn_black;
}
- dmnsn_delete_intersection(shadow_caster);
--reclevel;
}
@@ -448,12 +446,12 @@ dmnsn_raytrace_shoot(dmnsn_raytrace_state *state, dmnsn_line ray)
return dmnsn_black;
--state->reclevel;
- dmnsn_intersection *intersection
- = dmnsn_bvst_search(state->bvst, ray);
+ dmnsn_intersection intersection;
+ bool intersected = dmnsn_bvst_search(state->bvst, ray, &intersection);
dmnsn_color color = state->scene->background;
- if (intersection) {
- state->intersection = intersection;
+ if (intersected) {
+ state->intersection = &intersection;
state->r = dmnsn_line_point(state->intersection->ray,
state->intersection->t);
state->viewer = dmnsn_vector_normalize(
@@ -494,8 +492,6 @@ dmnsn_raytrace_shoot(dmnsn_raytrace_state *state, dmnsn_line ray)
}
color = dmnsn_color_add(state->diffuse, state->additional);
-
- dmnsn_delete_intersection(intersection);
}
return color;
diff --git a/libdimension/sphere.c b/libdimension/sphere.c
index 77fd1d4..09b6767 100644
--- a/libdimension/sphere.c
+++ b/libdimension/sphere.c
@@ -27,9 +27,9 @@
/* Sphere object callbacks */
-static dmnsn_intersection *
-dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line);
-
+static bool dmnsn_sphere_intersection_fn(const dmnsn_object *sphere,
+ dmnsn_line line,
+ dmnsn_intersection *intersection);
static bool dmnsn_sphere_inside_fn(const dmnsn_object *sphere,
dmnsn_vector point);
@@ -46,11 +46,11 @@ dmnsn_new_sphere()
}
/* Returns the closest intersection of `line' with `sphere' */
-static dmnsn_intersection *
-dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line)
+static bool
+dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line,
+ dmnsn_intersection *intersection)
{
double a, b, c, t;
- dmnsn_intersection *intersection = NULL;
/* Solve (x0 + nx*t)^2 + (y0 + ny*t)^2 + (z0 + nz*t)^2 == 1 */
@@ -65,16 +65,16 @@ dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line)
}
if (t >= 0.0) {
- intersection = dmnsn_new_intersection();
intersection->ray = line;
intersection->t = t;
intersection->normal = dmnsn_line_point(line, t);
intersection->texture = sphere->texture;
intersection->interior = sphere->interior;
+ return true;
}
}
- return intersection;
+ return false;
}
/* Return whether a point is inside a sphere (x**2 + y**2 + z**2 < 1.0) */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 05:13:35 +0000