started on the rope sim

[dosdemo] / tools / ropesim / src / ropesim.h

diff --git a/tools/ropesim/src/ropesim.h b/tools/ropesim/src/ropesim.h
new file mode 100644 (file)
index 0000000..f75e71b
--- /dev/null
+++ b/tools/ropesim/src/ropesim.h
@@ -0,0 +1,58 @@
+#ifndef ROPESIM_H_
+#define ROPESIM_H_
+
+#include "cgmath/cgmath.h"
+
+struct rsim_mass {
+       cgm_vec3 p;
+       cgm_vec3 v;
+       float m;
+       int fixed;
+
+       /* used for stringing fixed masses together */
+       struct rsim_mass *next;
+};
+
+struct rsim_spring {
+       float rest_len, k;
+       struct rsim_mass *mass[2];
+};
+
+struct rsim_rope {
+       struct rsim_mass *masses;
+       int num_masses;
+       struct rsim_spring *springs;
+       int num_springs;
+
+       /* elements of the masses array which are fixed */
+       struct rsim_mass *fixedlist;
+
+       struct rsim_rope *next;
+};
+
+struct rsim_world {
+       struct rsim_rope *ropes;        /* list of ropes to simulate */
+
+       cgm_vec3 grav, extforce;
+       float damping;
+
+       float udt;      /* microstepping delta (valid if > 0) */
+       float udelta_acc;       /* dt leftover accumulator for microstepping */
+};
+
+int rsim_init(struct rsim_world *rsim);
+void rsim_destroy(struct rsim_world *rsim);
+
+int rsim_add_rope(struct rsim_world *rsim, struct rsim_rope *rope);
+
+void rsim_step(struct rsim_world *rsim, float dt);
+
+struct rsim_rope *rsim_alloc_rope(int nmasses, int nsprings);
+void rsim_free_rope(struct rsim_rope *rope);
+int rsim_init_rope(struct rsim_rope *rope, int nmasses, int nsprings);
+void rsim_destroy_rope(struct rsim_rope *rope);
+
+int rsim_freeze_rope_mass(struct rsim_rope *rope, struct rsim_mass *m);
+int rsim_unfreeze_rope_mass(struct rsim_rope *rope, struct rsim_mass *m);
+
+#endif /* ROPESIM_H_ */