some clean up of math used to generate trace start/end in prydon cursor code

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6603 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/cl_input.c b/cl_input.c
index c4b05acc0ef6fcc0361b248c2b01b5486a8fcbc9..a2a0106ebf62879842c556f34d855f83a8404205 100644 (file)
--- a/cl_input.c
+++ b/cl_input.c
@@ -520,7 +520,7 @@ void CL_Move (void)
 extern void V_CalcRefdef(void);
 void CL_UpdatePrydonCursor(void)
 {
-       vec3_t temp, scale;
+       vec3_t temp;
 
        if (!cl_prydoncursor.integer)
                VectorClear(cl.cmd.cursor_screen);
@@ -551,18 +551,11 @@ void CL_UpdatePrydonCursor(void)
        cl.cmd.cursor_screen[1] = bound(-1, cl.cmd.cursor_screen[1], 1);
        cl.cmd.cursor_screen[2] = 1;
 
-       scale[0] = -r_view.frustum_x;
-       scale[1] = -r_view.frustum_y;
-       scale[2] = 1;
-
-       // trace distance
-       VectorScale(scale, 1000000, scale);
-
        // calculate current view matrix
        //V_CalcRefdef();
-       VectorClear(temp);
-       Matrix4x4_Transform(&r_view.matrix, temp, cl.cmd.cursor_start);
-       VectorSet(temp, cl.cmd.cursor_screen[2] * scale[2], cl.cmd.cursor_screen[0] * scale[0], cl.cmd.cursor_screen[1] * scale[1]);
+       Matrix4x4_OriginFromMatrix(&r_view.matrix, cl.cmd.cursor_start);
+       // calculate direction vector of cursor in viewspace by using frustum slopes
+       VectorSet(temp, cl.cmd.cursor_screen[2] * 1000000, cl.cmd.cursor_screen[0] * -r_view.frustum_x * 1000000, cl.cmd.cursor_screen[1] * -r_view.frustum_y * 1000000);
        Matrix4x4_Transform(&r_view.matrix, temp, cl.cmd.cursor_end);
        // trace from view origin to the cursor
        cl.cmd.cursor_fraction = CL_SelectTraceLine(cl.cmd.cursor_start, cl.cmd.cursor_end, cl.cmd.cursor_impact, cl.cmd.cursor_normal, &cl.cmd.cursor_entitynumber, (chase_active.integer || cl.intermission) ? &cl.entities[cl.playerentity].render : NULL, false);