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[erebus2020] / liberebus / src / surf.c

diff --git a/liberebus/src/surf.c b/liberebus/src/surf.c
new file mode 100644 (file)
index 0000000..7d8d38a
--- /dev/null
+++ b/liberebus/src/surf.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include "erebus.h"
+
+struct sph_data {
+       float rad;
+};
+struct box_data {
+       cgm_vec3 sz;
+};
+
+static int null_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit);
+static void null_sample(struct erb_surf *surf, cgm_vec3 *pos);
+static void null_bbox(struct erb_surf *surf, struct erb_aabb *bb);
+
+static int sph_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit);
+static void sph_sample(struct erb_surf *surf, cgm_vec3 *pos);
+static void sph_bbox(struct erb_surf *surf, struct erb_aabb *bb);
+
+static int box_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit);
+static void box_sample(struct erb_surf *surf, cgm_vec3 *pos);
+static void box_bbox(struct erb_surf *surf, struct erb_aabb *bb);
+
+
+struct erb_surf *erb_surface(int datasz)
+{
+       struct erb_surf *surf;
+
+       if(!(surf = calloc(1, sizeof *surf - sizeof surf->data + datasz))) {
+               fprintf(stderr, "failed to allocate surface\n");
+               return 0;
+       }
+       surf->isect = null_isect;
+       surf->sample = null_sample;
+       surf->calc_bbox = null_bbox;
+       return surf;
+}
+
+void erb_free_surface(struct erb_surf *surf)
+{
+       if(surf->node) {
+               erb_node_rmsurf(surf->node, surf);
+       }
+       free(surf);
+}
+
+struct erb_surf *erb_surf_sphere(float rad)
+{
+       struct erb_surf *surf;
+       struct sph_data *sdata;
+
+       if(!(surf = erb_surface(sizeof *sdata))) {
+               return 0;
+       }
+       surf->isect = sph_isect;
+       surf->sample = sph_sample;
+       surf->calc_bbox = sph_bbox;
+       sdata = (struct sph_data*)surf->data;
+       sdata->rad = rad;
+       return surf;
+}
+
+struct erb_surf *erb_surf_box(float xsz, float ysz, float zsz)
+{
+       struct erb_surf *surf;
+       struct box_data *bdata;
+
+       if(!(surf = erb_surface(sizeof *bdata))) {
+               return 0;
+       }
+       surf->isect = box_isect;
+       surf->sample = box_sample;
+       surf->calc_bbox = box_bbox;
+       bdata = (struct box_data*)surf->data;
+       cgm_vcons(&bdata->sz, xsz, ysz, zsz);
+       return surf;
+}
+
+
+static int null_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit)
+{
+       return 0;
+}
+
+static void null_sample(struct erb_surf *surf, cgm_vec3 *pos)
+{
+       pos->x = pos->y = pos->z = 0;
+}
+
+static void null_bbox(struct erb_surf *surf, struct erb_aabb *bb)
+{
+       bb->pos.x = bb->pos.y = bb->pos.z = 0;
+       bb->sz.x = bb->sz.y = bb->sz.z = 0;
+}
+
+static int sph_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit)
+{
+       return 0;
+}
+
+static void sph_sample(struct erb_surf *surf, cgm_vec3 *pos)
+{
+}
+
+static void sph_bbox(struct erb_surf *surf, struct erb_aabb *bb)
+{
+}
+
+static int box_isect(struct erb_surf *surf, struct erb_ray *ray, struct erb_hit *hit)
+{
+       return 0;
+}
+
+static void box_sample(struct erb_surf *surf, cgm_vec3 *pos)
+{
+}
+
+static void box_bbox(struct erb_surf *surf, struct erb_aabb *bb)
+{
+}