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Editors note: this is a very cool effect, you'll have all your view x-flipped, so left becomes right and vica versa.
Simple tutorial to add x flipping to the Quake engine(and a cvar to control it). Open up cl_input.c and find the CL_AdjustAngles function and add the following(between the "//Atomizer" and "//Atom" comments):
void CL_AdjustAngles (void)
{
float speed;
float up, down;
if (in_speed.state & 1)
speed = host_frametime * cl_anglespeedkey.value;
else
speed = host_frametime;
//Atomizer - GL_XFLIP
if (gl_xflip.value) cl.viewangles[YAW] *= -1;
//Atom
if (!(in_strafe.state & 1))
{
cl.viewangles[YAW] -= speed*cl_yawspeed.value*CL_KeyState (&in_right);
cl.viewangles[YAW] += speed*cl_yawspeed.value*CL_KeyState (&in_left);
cl.viewangles[YAW] = anglemod(cl.viewangles[YAW]);
}
//Atomizer - GL_XFLIP
if (gl_xflip.value) cl.viewangles[YAW] *= -1;
//Atom
Now in the same file, find the CL_BaseMove function and add the changes:
void CL_BaseMove (usercmd_t *cmd)
{
if (cls.signon != SIGNONS)
return;
CL_AdjustAngles ();
Q_memset (cmd, 0, sizeof(*cmd));
if (in_strafe.state & 1)
{
cmd->sidemove += cl_sidespeed.value * CL_KeyState (&in_right);
cmd->sidemove -= cl_sidespeed.value * CL_KeyState (&in_left);
}
cmd->sidemove += cl_sidespeed.value * CL_KeyState (&in_moveright);
cmd->sidemove -= cl_sidespeed.value * CL_KeyState (&in_moveleft);
//Atomizer - GL_XFLIP
if(gl_xflip.value) cmd->sidemove *= -1;
//Atom
Now open up gl_rmain.c and find the following line:
cvar_t gl_doubleeyes = {"gl_doubleeys", "1"};
And add this below it:
//Atomizer - GL_XFLIP
cvar_t gl_xflip = {"gl_xflip", "0"};
//Atom
In the same file, find R_SetupGL and add the following:
glRotatef (-90, 1, 0, 0); // put Z going up
glRotatef (90, 0, 0, 1); // put Z going up
//Atomizer - GL_XFLIP
if (gl_xflip.value)
{
glScalef (1, -1, 1);
glCullFace(GL_BACK);
}
//Atom
glRotatef (-r_refdef.viewangles[2], 1, 0, 0);
glRotatef (-r_refdef.viewangles[0], 0, 1, 0);
glRotatef (-r_refdef.viewangles[1], 0, 0, 1);
Cvar_RegisterVariable (&gl_doubleeyes); //Atomizer - GL_XFLIP Cvar_RegisterVariable (&gl_xflip); //Atom extern cvar_t gl_doubleeyes; //Atomizer - GL_XFLIP extern cvar_t gl_xflip; //Atom
//if (mx || my)
// Con_DPrintf("mx=%d, my=%d\n", mx, my);
//Atomizer - GL_XFLIP
if(gl_xflip.value) mx *= -1;
//Atom
if (m_filter.value)
{
mouse_x = (mx + old_mouse_x) * 0.5;
mouse_y = (my + old_mouse_y) * 0.5;
}
else
{
mouse_x = mx;
mouse_y = my;
}
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