initial raytracing experiment

[dosdemo] / src / scr / rt.h

diff --git a/src/scr/rt.h b/src/scr/rt.h
new file mode 100644 (file)
index 0000000..f619a88
--- /dev/null
+++ b/src/scr/rt.h
@@ -0,0 +1,81 @@
+#ifndef RT_H_
+#define RT_H_
+
+#include "image.h"
+#include "cgmath/cgmath.h"
+
+struct rtmaterial {
+       cgm_vec3 kd, ks;
+       float shin;
+       struct image *tex;
+};
+
+enum rt_obj_type { RT_SPH, RT_PLANE };
+
+#define OBJ_COMMON     \
+       enum rt_obj_type type; \
+       struct rtmaterial mtl
+
+struct rtany {
+       OBJ_COMMON;
+};
+
+struct rtsphere {
+       OBJ_COMMON;
+       cgm_vec3 p;
+       float r;
+};
+
+struct rtplane {
+       OBJ_COMMON;
+       cgm_vec3 n;
+       float d;
+};
+
+union rtobject {
+       enum rt_obj_type type;
+       struct rtany x;
+       struct rtsphere s;
+       struct rtplane p;
+};
+
+struct rtlight {
+       cgm_vec3 p, color;
+};
+
+struct rayhit {
+       float t;
+       cgm_vec3 p, n;
+       float u, v;
+       cgm_ray *ray;
+       union rtobject *obj;
+};
+
+struct rtscene {
+       union rtobject **obj;
+       int num_obj;
+       struct rtlight **lt;
+       int num_lt;
+};
+
+/* scene management */
+void rt_init(struct rtscene *scn);
+void rt_destroy(struct rtscene *scn);
+
+void rt_color(float r, float g, float b);
+void rt_specular(float r, float g, float b);
+void rt_shininess(float s);
+
+union rtobject *rt_add_sphere(struct rtscene *scn, float x, float y, float z, float r);
+union rtobject *rt_add_plane(struct rtscene *scn, float nx, float ny, float nz, float d);
+struct rtlight *rt_add_light(struct rtscene *scn, float x, float y, float z);
+
+/* returns 0 for no hit */
+int ray_trace(cgm_ray *ray, struct rtscene *scn, int lvl, cgm_vec3 *color);
+
+int ray_object(cgm_ray *ray, union rtobject *obj, float maxt, struct rayhit *hit);
+int ray_scene(cgm_ray *ray, struct rtscene *scn, float maxt, struct rayhit *hit);
+int ray_sphere(cgm_ray *ray, struct rtsphere *sph, float maxt, struct rayhit *hit);
+int ray_plane(cgm_ray *ray, struct rtplane *plane, float maxt, struct rayhit *hit);
+
+#endif /* RT_H_ */