added physics.c

1 files changed, 33 insertions, 0 deletions

diff --git a/src/physics.c b/src/physics.c
new file mode 100644
index 0000000..a414244
--- /dev/null
+++ b/src/physics.c
@@ -0,0 +1,33 @@
+#include "common.h"
+
+extern struct global global;
+extern struct gra_global gra_global;
+
+#define MINIMUM_Y 10
+#define GRAVITY 9.8
+
+//collision detection and gravity
+//I need to get a sphere of each object then compare distances and radii.
+//maye let each object have a collision box type. either rectangular prism or sphere.
+//sphere would be fine for players.
+
+/// VELOCITIES:
+/*
+foward/backward, left/right, up/down, x, y, z
+rotation-relative-x,rry,rrz
+*/
+int apply_physics() {
+  int i;
+  //we can just assume things will float if they don't have a group_rot
+  for(i=0;global.group_rot[i]  && i < MAXSHAPES;i++) {//this should be applied to group_rots
+    if(!strcmp(global.group_rot[i]->id,global.user)) {//only apply gravity to the camera.
+      global.group_rot[i]->v.y += (GRAVITY / (float)(global.lps?global.lps:1)); //heh. "fps" needs a headless equivalent now.
+      global.group_rot[i]->p.y -= global.group_rot[i]->v.y;
+      if(global.group_rot[i]->p.y < MINIMUM_Y) {//we've moved so we need to output a move command?
+        global.group_rot[i]->v.y=0;
+        global.group_rot[i]->p.y=MINIMUM_Y;
+      }
+    }
+  }
+  return 1;
+}