Tutorial: Adding r_viewmodeloffset to GLQuake/WinQuake
Posted: Wed Nov 19, 2008 5:15 am
Adding r_viewmodeloffset cvar to a Quake engine
The r_viewmodeloffset console variable allows you to position the gun to the left or right by any amount you choose. One example is using r_viewmodeloffset 5 or -5 to shift the gun to the left or right.
This code isn't renderer specific so both GLQuake and WinQuake receive the functionality.
[It can also position higher or farther in front if you want via r_viewmodeloffset "0 5 6". But that doesn't appear to be commonly used.]
Instuctions adding it to stock GLQuake/WinQuake
1. First we need 1 extra addition to mathlib so open mathlib.h
Locate this rotten code:
I'm pretty sure this code made it's first appearance in FTEQW back in 2005 maybe.
The r_viewmodeloffset console variable allows you to position the gun to the left or right by any amount you choose. One example is using r_viewmodeloffset 5 or -5 to shift the gun to the left or right.
This code isn't renderer specific so both GLQuake and WinQuake receive the functionality.
[It can also position higher or farther in front if you want via r_viewmodeloffset "0 5 6". But that doesn't appear to be commonly used.]
Instuctions adding it to stock GLQuake/WinQuake
1. First we need 1 extra addition to mathlib so open mathlib.h
2. Now open mathlib.c and add the function itself//Add this definition to very bottom
int ParseFloats(char *s, float *f, int *f_size);
3. Open view.c - Near the top, find "cvar_t crosshair" (about 60 lines from top).Code: Select all
// Add this to the bottom if you prefer. int ParseFloats(char *s, float *f, int *f_size) { int i, argc; if (!s || !f || !f_size) Sys_Error("ParseFloats() wrong params"); if (f_size[0] <= 0) return (f_size[0] = 0); // array have no size, unusual but no crime Cmd_TokenizeString(s); argc = min(Cmd_Argc(), f_size[0]); for(i = 0; i < argc; i++) f[i] = Q_atof(Cmd_Argv(i)); for( ; i < f_size[0]; i++) f[i] = 0; // zeroing unused elements return (f_size[0] = argc); }
4. Still in view.c, find void V_CalcRefdef (void) around line 850-860//Add this after crosshair cvar declaration
// the "true" means it saves to config
cvar_t r_viewmodeloffset = {"r_viewmodeloffset", "0", true};
Locate this rotten code:
Replace it with this ...Code: Select all
for (i=0 ; i<3 ; i++) { view->origin[i] += forward[i]*bob*0.4; // view->origin[i] += right[i]*bob*0.4; // view->origin[i] += up[i]*bob*0.8; } view->origin[2] += bob;
5. In view.c, find the section where Cvar_RegisterVariable is. Add this one in there as such ...Code: Select all
#if 0 for (i=0 ; i<3 ; i++) { view->origin[i] += forward[i]*bob*0.4; // view->origin[i] += right[i]*bob*0.4; // view->origin[i] += up[i]*bob*0.8; } view->origin[2] += bob; #endif #if 1 VectorCopy (r_refdef.vieworg, view->origin); VectorMA (view->origin, bob * 0.4, forward, view->origin); if (r_viewmodeloffset.string[0]) { float offset[3]; int size = sizeof(offset)/sizeof(offset[0]); ParseFloats(r_viewmodeloffset.string, offset, &size); VectorMA (view->origin, offset[0], right, view->origin); VectorMA (view->origin, -offset[1], up, view->origin); VectorMA (view->origin, offset[2], forward, view->origin); } #endif
You are done. Compile + start up Quake and type r_viewmodeloffset 5 in the console. Or type r_viewmodeloffset -5 in the console.Code: Select all
Cvar_RegisteVariable (&r_viewmodeloffset);
I'm pretty sure this code made it's first appearance in FTEQW back in 2005 maybe.
