csprogs.c

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/*
Copyright (C) 2006-2021 DarkPlaces contributors
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
 
#include "quakedef.h"
#include "progsvm.h"
#include "clprogdefs.h"
#include "csprogs.h"
#include "cl_collision.h"
#include "snd_main.h"
#include "clvm_cmds.h"
#include "prvm_cmds.h"
 
//============================================================================
// Client prog handling
//[515]: omg !!! optimize it ! a lot of hacks here and there also :P
 
#define CSQC_RETURNVAL  prog->globals.fp[OFS_RETURN]
 
void CL_VM_PreventInformationLeaks(void)
{
    prvm_prog_t *prog = CLVM_prog;
 
    if(!prog->loaded)
        return;
 
    VM_ClearTraceGlobals(prog);
    PRVM_clientglobalfloat(trace_networkentity) = 0;
}
 
 
static void CL_CheckRequiredFuncs(prvm_prog_t *prog, const char *filename)
{
    if (PRVM_ED_FindFunction(prog, "CSQC_UpdateView"))
        return;
    else if (PRVM_ED_FindFunction(prog, "CSQC_DrawHud"))
        prog->flag |= PRVM_CSQC_SIMPLE;
    else
        prog->error_cmd("%s: no CSQC_UpdateView (EXT_CSQC) or CSQC_DrawHud (CSQC_SIMPLE) function found in %s", prog->name, filename);
}
 
#define CL_REQFIELDS (sizeof(cl_reqfields) / sizeof(prvm_required_field_t))
 
prvm_required_field_t cl_reqfields[] =
{
#define PRVM_DECLARE_serverglobalfloat(x)
#define PRVM_DECLARE_serverglobalvector(x)
#define PRVM_DECLARE_serverglobalstring(x)
#define PRVM_DECLARE_serverglobaledict(x)
#define PRVM_DECLARE_serverglobalfunction(x)
#define PRVM_DECLARE_clientglobalfloat(x)
#define PRVM_DECLARE_clientglobalvector(x)
#define PRVM_DECLARE_clientglobalstring(x)
#define PRVM_DECLARE_clientglobaledict(x)
#define PRVM_DECLARE_clientglobalfunction(x)
#define PRVM_DECLARE_menuglobalfloat(x)
#define PRVM_DECLARE_menuglobalvector(x)
#define PRVM_DECLARE_menuglobalstring(x)
#define PRVM_DECLARE_menuglobaledict(x)
#define PRVM_DECLARE_menuglobalfunction(x)
#define PRVM_DECLARE_serverfieldfloat(x)
#define PRVM_DECLARE_serverfieldvector(x)
#define PRVM_DECLARE_serverfieldstring(x)
#define PRVM_DECLARE_serverfieldedict(x)
#define PRVM_DECLARE_serverfieldfunction(x)
#define PRVM_DECLARE_clientfieldfloat(x) {ev_float, #x },
#define PRVM_DECLARE_clientfieldvector(x) {ev_vector, #x },
#define PRVM_DECLARE_clientfieldstring(x) {ev_string, #x },
#define PRVM_DECLARE_clientfieldedict(x) {ev_entity, #x },
#define PRVM_DECLARE_clientfieldfunction(x) {ev_function, #x },
#define PRVM_DECLARE_menufieldfloat(x)
#define PRVM_DECLARE_menufieldvector(x)
#define PRVM_DECLARE_menufieldstring(x)
#define PRVM_DECLARE_menufieldedict(x)
#define PRVM_DECLARE_menufieldfunction(x)
#define PRVM_DECLARE_serverfunction(x)
#define PRVM_DECLARE_clientfunction(x)
#define PRVM_DECLARE_menufunction(x)
#define PRVM_DECLARE_field(x)
#define PRVM_DECLARE_global(x)
#define PRVM_DECLARE_function(x)
#include "prvm_offsets.h"
#undef PRVM_DECLARE_serverglobalfloat
#undef PRVM_DECLARE_serverglobalvector
#undef PRVM_DECLARE_serverglobalstring
#undef PRVM_DECLARE_serverglobaledict
#undef PRVM_DECLARE_serverglobalfunction
#undef PRVM_DECLARE_clientglobalfloat
#undef PRVM_DECLARE_clientglobalvector
#undef PRVM_DECLARE_clientglobalstring
#undef PRVM_DECLARE_clientglobaledict
#undef PRVM_DECLARE_clientglobalfunction
#undef PRVM_DECLARE_menuglobalfloat
#undef PRVM_DECLARE_menuglobalvector
#undef PRVM_DECLARE_menuglobalstring
#undef PRVM_DECLARE_menuglobaledict
#undef PRVM_DECLARE_menuglobalfunction
#undef PRVM_DECLARE_serverfieldfloat
#undef PRVM_DECLARE_serverfieldvector
#undef PRVM_DECLARE_serverfieldstring
#undef PRVM_DECLARE_serverfieldedict
#undef PRVM_DECLARE_serverfieldfunction
#undef PRVM_DECLARE_clientfieldfloat
#undef PRVM_DECLARE_clientfieldvector
#undef PRVM_DECLARE_clientfieldstring
#undef PRVM_DECLARE_clientfieldedict
#undef PRVM_DECLARE_clientfieldfunction
#undef PRVM_DECLARE_menufieldfloat
#undef PRVM_DECLARE_menufieldvector
#undef PRVM_DECLARE_menufieldstring
#undef PRVM_DECLARE_menufieldedict
#undef PRVM_DECLARE_menufieldfunction
#undef PRVM_DECLARE_serverfunction
#undef PRVM_DECLARE_clientfunction
#undef PRVM_DECLARE_menufunction
#undef PRVM_DECLARE_field
#undef PRVM_DECLARE_global
#undef PRVM_DECLARE_function
};
 
#define CL_REQGLOBALS (sizeof(cl_reqglobals) / sizeof(prvm_required_field_t))
 
prvm_required_field_t cl_reqglobals[] =
{
#define PRVM_DECLARE_serverglobalfloat(x)
#define PRVM_DECLARE_serverglobalvector(x)
#define PRVM_DECLARE_serverglobalstring(x)
#define PRVM_DECLARE_serverglobaledict(x)
#define PRVM_DECLARE_serverglobalfunction(x)
#define PRVM_DECLARE_clientglobalfloat(x) {ev_float, #x},
#define PRVM_DECLARE_clientglobalvector(x) {ev_vector, #x},
#define PRVM_DECLARE_clientglobalstring(x) {ev_string, #x},
#define PRVM_DECLARE_clientglobaledict(x) {ev_entity, #x},
#define PRVM_DECLARE_clientglobalfunction(x) {ev_function, #x},
#define PRVM_DECLARE_menuglobalfloat(x)
#define PRVM_DECLARE_menuglobalvector(x)
#define PRVM_DECLARE_menuglobalstring(x)
#define PRVM_DECLARE_menuglobaledict(x)
#define PRVM_DECLARE_menuglobalfunction(x)
#define PRVM_DECLARE_serverfieldfloat(x)
#define PRVM_DECLARE_serverfieldvector(x)
#define PRVM_DECLARE_serverfieldstring(x)
#define PRVM_DECLARE_serverfieldedict(x)
#define PRVM_DECLARE_serverfieldfunction(x)
#define PRVM_DECLARE_clientfieldfloat(x)
#define PRVM_DECLARE_clientfieldvector(x)
#define PRVM_DECLARE_clientfieldstring(x)
#define PRVM_DECLARE_clientfieldedict(x)
#define PRVM_DECLARE_clientfieldfunction(x)
#define PRVM_DECLARE_menufieldfloat(x)
#define PRVM_DECLARE_menufieldvector(x)
#define PRVM_DECLARE_menufieldstring(x)
#define PRVM_DECLARE_menufieldedict(x)
#define PRVM_DECLARE_menufieldfunction(x)
#define PRVM_DECLARE_serverfunction(x)
#define PRVM_DECLARE_clientfunction(x)
#define PRVM_DECLARE_menufunction(x)
#define PRVM_DECLARE_field(x)
#define PRVM_DECLARE_global(x)
#define PRVM_DECLARE_function(x)
#include "prvm_offsets.h"
#undef PRVM_DECLARE_serverglobalfloat
#undef PRVM_DECLARE_serverglobalvector
#undef PRVM_DECLARE_serverglobalstring
#undef PRVM_DECLARE_serverglobaledict
#undef PRVM_DECLARE_serverglobalfunction
#undef PRVM_DECLARE_clientglobalfloat
#undef PRVM_DECLARE_clientglobalvector
#undef PRVM_DECLARE_clientglobalstring
#undef PRVM_DECLARE_clientglobaledict
#undef PRVM_DECLARE_clientglobalfunction
#undef PRVM_DECLARE_menuglobalfloat
#undef PRVM_DECLARE_menuglobalvector
#undef PRVM_DECLARE_menuglobalstring
#undef PRVM_DECLARE_menuglobaledict
#undef PRVM_DECLARE_menuglobalfunction
#undef PRVM_DECLARE_serverfieldfloat
#undef PRVM_DECLARE_serverfieldvector
#undef PRVM_DECLARE_serverfieldstring
#undef PRVM_DECLARE_serverfieldedict
#undef PRVM_DECLARE_serverfieldfunction
#undef PRVM_DECLARE_clientfieldfloat
#undef PRVM_DECLARE_clientfieldvector
#undef PRVM_DECLARE_clientfieldstring
#undef PRVM_DECLARE_clientfieldedict
#undef PRVM_DECLARE_clientfieldfunction
#undef PRVM_DECLARE_menufieldfloat
#undef PRVM_DECLARE_menufieldvector
#undef PRVM_DECLARE_menufieldstring
#undef PRVM_DECLARE_menufieldedict
#undef PRVM_DECLARE_menufieldfunction
#undef PRVM_DECLARE_serverfunction
#undef PRVM_DECLARE_clientfunction
#undef PRVM_DECLARE_menufunction
#undef PRVM_DECLARE_field
#undef PRVM_DECLARE_global
#undef PRVM_DECLARE_function
};
 
void CL_VM_UpdateDmgGlobals (int dmg_take, int dmg_save, vec3_t dmg_origin)
{
    prvm_prog_t *prog = CLVM_prog;
 
    if(prog->loaded)
    {
        PRVM_clientglobalfloat(dmg_take) = dmg_take;
        PRVM_clientglobalfloat(dmg_save) = dmg_save;
        VectorCopy(dmg_origin, PRVM_clientglobalvector(dmg_origin));
    }
}
 
void CSQC_UpdateNetworkTimes(double newtime, double oldtime)
{
    prvm_prog_t *prog = CLVM_prog;
 
    if(!prog->loaded)
        return;
 
    PRVM_clientglobalfloat(servertime) = newtime;
    PRVM_clientglobalfloat(serverprevtime) = oldtime;
    PRVM_clientglobalfloat(serverdeltatime) = newtime - oldtime;
}
 
//[515]: set globals before calling R_UpdateView, WEIRD CRAP
static void CSQC_SetGlobals (double frametime)
{
    vec3_t pmove_org;
    prvm_prog_t *prog = CLVM_prog;
 
    PRVM_clientglobalfloat(time) = cl.time;
    PRVM_clientglobalfloat(cltime) = host.realtime; // Spike named it that way.
    PRVM_clientglobalfloat(frametime) = frametime;
    PRVM_clientglobalfloat(servercommandframe) = cls.servermovesequence;
    PRVM_clientglobalfloat(clientcommandframe) = cl.movecmd[0].sequence;
    VectorCopy(cl.viewangles, PRVM_clientglobalvector(input_angles));
    // // FIXME: this actually belongs into getinputstate().. [12/17/2007 Black]
    PRVM_clientglobalfloat(input_buttons) = cl.movecmd[0].buttons;
    VectorSet(PRVM_clientglobalvector(input_movevalues), cl.movecmd[0].forwardmove, cl.movecmd[0].sidemove, cl.movecmd[0].upmove);
    VectorCopy(cl.csqc_vieworiginfromengine, cl.csqc_vieworigin);
    VectorCopy(cl.csqc_viewanglesfromengine, cl.csqc_viewangles);
 
    // LadyHavoc: Spike says not to do this, but without pmove_org the
    // CSQC is useless as it can't alter the view origin without
    // completely replacing it
    Matrix4x4_OriginFromMatrix(&cl.entities[cl.viewentity].render.matrix, pmove_org);
    VectorCopy(pmove_org, PRVM_clientglobalvector(pmove_org));
    VectorCopy(cl.movement_velocity, PRVM_clientglobalvector(pmove_vel));
    PRVM_clientglobalfloat(pmove_onground) = cl.onground;
    PRVM_clientglobalfloat(pmove_inwater) = cl.inwater;
 
    VectorCopy(cl.viewangles, PRVM_clientglobalvector(view_angles));
    VectorCopy(cl.punchangle, PRVM_clientglobalvector(view_punchangle));
    VectorCopy(cl.punchvector, PRVM_clientglobalvector(view_punchvector));
    PRVM_clientglobalfloat(maxclients) = cl.maxclients;
 
    PRVM_clientglobalfloat(player_localentnum) = cl.viewentity;
 
    CSQC_R_RecalcView();
}
 
void CSQC_Predraw (prvm_edict_t *ed)
{
    prvm_prog_t *prog = CLVM_prog;
    int b;
    if(!PRVM_clientedictfunction(ed, predraw))
        return;
    b = PRVM_clientglobaledict(self);
    PRVM_clientglobaledict(self) = PRVM_EDICT_TO_PROG(ed);
    prog->ExecuteProgram(prog, PRVM_clientedictfunction(ed, predraw), "CSQC_Predraw: NULL function\n");
    PRVM_clientglobaledict(self) = b;
}
 
void CSQC_Think (prvm_edict_t *ed)
{
    prvm_prog_t *prog = CLVM_prog;
    int b;
    if(PRVM_clientedictfunction(ed, think))
    if(PRVM_clientedictfloat(ed, nextthink) && PRVM_clientedictfloat(ed, nextthink) <= PRVM_clientglobalfloat(time))
    {
        PRVM_clientedictfloat(ed, nextthink) = 0;
        b = PRVM_clientglobaledict(self);
        PRVM_clientglobaledict(self) = PRVM_EDICT_TO_PROG(ed);
        prog->ExecuteProgram(prog, PRVM_clientedictfunction(ed, think), "CSQC_Think: NULL function\n");
        PRVM_clientglobaledict(self) = b;
    }
}
 
extern cvar_t cl_noplayershadow;
qbool CSQC_AddRenderEdict(prvm_edict_t *ed, int edictnum)
{
    prvm_prog_t *prog = CLVM_prog;
    int renderflags;
    int c;
    float scale;
    entity_render_t *entrender;
    model_t *model;
    prvm_vec3_t modellight_origin;
 
    model = CL_GetModelFromEdict(ed);
    if (!model)
        return false;
 
    if (edictnum)
    {
        if (r_refdef.scene.numentities >= r_refdef.scene.maxentities)
            return false;
        entrender = cl.csqcrenderentities + edictnum;
        r_refdef.scene.entities[r_refdef.scene.numentities++] = entrender;
        entrender->entitynumber = edictnum + MAX_EDICTS;
        //entrender->shadertime = 0; // shadertime was set by spawn()
        entrender->flags = 0;
        entrender->effects = 0;
        entrender->alpha = 1;
        entrender->scale = 1;
        VectorSet(entrender->colormod, 1, 1, 1);
        VectorSet(entrender->glowmod, 1, 1, 1);
        entrender->allowdecals = true;
    }
    else
    {
        entrender = CL_NewTempEntity(0);
        if (!entrender)
            return false;
    }
 
    entrender->userwavefunc_param[0] = PRVM_clientedictfloat(ed, userwavefunc_param0);
    entrender->userwavefunc_param[1] = PRVM_clientedictfloat(ed, userwavefunc_param1);
    entrender->userwavefunc_param[2] = PRVM_clientedictfloat(ed, userwavefunc_param2);
    entrender->userwavefunc_param[3] = PRVM_clientedictfloat(ed, userwavefunc_param3);
 
    entrender->model = model;
    entrender->skinnum = (int)PRVM_clientedictfloat(ed, skin);
    entrender->effects |= entrender->model->effects;
    renderflags = (int)PRVM_clientedictfloat(ed, renderflags);
    entrender->alpha = PRVM_clientedictfloat(ed, alpha);
    entrender->scale = scale = PRVM_clientedictfloat(ed, scale);
    VectorCopy(PRVM_clientedictvector(ed, colormod), entrender->colormod);
    VectorCopy(PRVM_clientedictvector(ed, glowmod), entrender->glowmod);
    if(PRVM_clientedictfloat(ed, effects))  entrender->effects |= (int)PRVM_clientedictfloat(ed, effects);
    if (!entrender->alpha)
        entrender->alpha = 1.0f;
    if (!entrender->scale)
        entrender->scale = scale = 1.0f;
    if (!VectorLength2(entrender->colormod))
        VectorSet(entrender->colormod, 1, 1, 1);
    if (!VectorLength2(entrender->glowmod))
        VectorSet(entrender->glowmod, 1, 1, 1);
 
    // LadyHavoc: use the CL_GetTagMatrix function on self to ensure consistent behavior (duplicate code would be bad)
    // this also sets the custommodellight_origin for us
    CL_GetTagMatrix(prog, &entrender->matrix, ed, 0, modellight_origin);
    VectorCopy(modellight_origin, entrender->custommodellight_origin);
 
    // set up the animation data
    VM_GenerateFrameGroupBlend(prog, ed->priv.server->framegroupblend, ed);
    VM_FrameBlendFromFrameGroupBlend(ed->priv.server->frameblend, ed->priv.server->framegroupblend, model, cl.time);
    VM_UpdateEdictSkeleton(prog, ed, model, ed->priv.server->frameblend);
    if (PRVM_clientedictfloat(ed, shadertime)) // hack for csprogs.dat files that do not set shadertime, leaves the value at entity spawn time
        entrender->shadertime = PRVM_clientedictfloat(ed, shadertime);
 
    // transparent offset
    if (renderflags & RF_USETRANSPARENTOFFSET)
        entrender->transparent_offset = PRVM_clientglobalfloat(transparent_offset);
 
    // model light
    if (renderflags & RF_MODELLIGHT)
    {
        if (PRVM_clientedictvector(ed, modellight_ambient)) VectorCopy(PRVM_clientedictvector(ed, modellight_ambient), entrender->custommodellight_ambient); else VectorClear(entrender->custommodellight_ambient);
        if (PRVM_clientedictvector(ed, modellight_diffuse)) VectorCopy(PRVM_clientedictvector(ed, modellight_diffuse), entrender->custommodellight_diffuse); else VectorClear(entrender->custommodellight_diffuse);
        if (PRVM_clientedictvector(ed, modellight_dir))     VectorCopy(PRVM_clientedictvector(ed, modellight_dir), entrender->custommodellight_lightdir);    else VectorClear(entrender->custommodellight_lightdir);
        entrender->flags |= RENDER_CUSTOMIZEDMODELLIGHT;
    }
 
    if(renderflags)
    {
        if(renderflags & RF_VIEWMODEL) entrender->flags |= RENDER_VIEWMODEL | RENDER_NODEPTHTEST;
        if(renderflags & RF_EXTERNALMODEL) entrender->flags |= RENDER_EXTERIORMODEL;
        if(renderflags & RF_WORLDOBJECT) entrender->flags |= RENDER_WORLDOBJECT;
        if(renderflags & RF_DEPTHHACK) entrender->flags |= RENDER_NODEPTHTEST;
        if(renderflags & RF_ADDITIVE) entrender->flags |= RENDER_ADDITIVE;
        if(renderflags & RF_DYNAMICMODELLIGHT) entrender->flags |= RENDER_DYNAMICMODELLIGHT;
    }
 
    c = (int)PRVM_clientedictfloat(ed, colormap);
    if (c <= 0)
        CL_SetEntityColormapColors(entrender, -1);
    else if (c <= cl.maxclients && cl.scores != NULL)
        CL_SetEntityColormapColors(entrender, cl.scores[c-1].colors);
    else
        CL_SetEntityColormapColors(entrender, c);
 
    entrender->flags &= ~(RENDER_SHADOW | RENDER_LIGHT | RENDER_NOSELFSHADOW);
    // either fullbright or lit
    if(!r_fullbright.integer)
    {
        if (!(entrender->effects & EF_FULLBRIGHT) && !(renderflags & RF_FULLBRIGHT))
            entrender->flags |= RENDER_LIGHT;
    }
    // hide player shadow during intermission or nehahra movie
    if (!(entrender->effects & (EF_NOSHADOW | EF_ADDITIVE | EF_NODEPTHTEST))
     &&  (entrender->alpha >= 1)
     && !(renderflags & RF_NOSHADOW)
     && !(entrender->flags & RENDER_VIEWMODEL)
     && (!(entrender->flags & RENDER_EXTERIORMODEL) || (!cl.intermission && cls.protocol != PROTOCOL_NEHAHRAMOVIE && !cl_noplayershadow.integer)))
        entrender->flags |= RENDER_SHADOW;
    if (entrender->flags & RENDER_VIEWMODEL)
        entrender->flags |= RENDER_NOSELFSHADOW;
    if (entrender->effects & EF_NOSELFSHADOW)
        entrender->flags |= RENDER_NOSELFSHADOW;
    if (entrender->effects & EF_NODEPTHTEST)
        entrender->flags |= RENDER_NODEPTHTEST;
    if (entrender->effects & EF_ADDITIVE)
        entrender->flags |= RENDER_ADDITIVE;
    if (entrender->effects & EF_DOUBLESIDED)
        entrender->flags |= RENDER_DOUBLESIDED;
    if (entrender->effects & EF_DYNAMICMODELLIGHT)
        entrender->flags |= RENDER_DYNAMICMODELLIGHT;
 
    // make the other useful stuff
    memcpy(entrender->framegroupblend, ed->priv.server->framegroupblend, sizeof(ed->priv.server->framegroupblend));
    CL_UpdateRenderEntity(entrender);
 
    // override animation data with full control
    memcpy(entrender->frameblend, ed->priv.server->frameblend, sizeof(ed->priv.server->frameblend));
    if (ed->priv.server->skeleton.relativetransforms)
        entrender->skeleton = &ed->priv.server->skeleton;
    else
        entrender->skeleton = NULL;
 
    return true;
}
 
// 0 = keydown, key, character (EXT_CSQC)
// 1 = keyup, key, character (EXT_CSQC)
// 2 = mousemove relative, x, y (EXT_CSQC)
// 3 = mousemove absolute, x, y (DP_CSQC)
qbool CL_VM_InputEvent (int eventtype, float x, float y)
{
    prvm_prog_t *prog = CLVM_prog;
    qbool r;
 
    if(!prog->loaded)
        return false;
 
    if (!PRVM_clientfunction(CSQC_InputEvent))
        r = false;
    else
    {
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
        PRVM_G_FLOAT(OFS_PARM0) = eventtype;
        PRVM_G_FLOAT(OFS_PARM1) = x; // key or x
        PRVM_G_FLOAT(OFS_PARM2) = y; // ascii or y
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_InputEvent), "QC function CSQC_InputEvent is missing");
        r = CSQC_RETURNVAL != 0;
    }
    return r;
}
 
extern r_refdef_view_t csqc_original_r_refdef_view;
extern r_refdef_view_t csqc_main_r_refdef_view;
qbool CL_VM_UpdateView (double frametime)
{
    prvm_prog_t *prog = CLVM_prog;
    vec3_t emptyvector;
    emptyvector[0] = 0;
    emptyvector[1] = 0;
    emptyvector[2] = 0;
//  vec3_t oldangles;
 
    if(!prog->loaded)
        return false;
 
    R_TimeReport("pre-UpdateView");
 
    csqc_original_r_refdef_view = r_refdef.view;
    csqc_main_r_refdef_view = r_refdef.view;
    //VectorCopy(cl.viewangles, oldangles);
    PRVM_clientglobalfloat(time) = cl.time;
    PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
    CSQC_SetGlobals(frametime);
    // clear renderable entity and light lists to prevent crashes if the
    // CSQC_UpdateView function does not call R_ClearScene as it should
    r_refdef.scene.numentities = 0;
    r_refdef.scene.numlights = 0;
    // polygonbegin without draw2d arg has to guess
    prog->polygonbegin_guess2d = false;
    // free memory for resources that are no longer referenced
    PRVM_GarbageCollection(prog);
    // pass in width and height and menu/focus state as parameters (EXT_CSQC_1)
    if (csqc_lowres.integer)
    {
        PRVM_G_FLOAT(OFS_PARM0) = vid_conwidth.value;
        PRVM_G_FLOAT(OFS_PARM1) = vid_conheight.value;
    }
    else
    {
        PRVM_G_FLOAT(OFS_PARM0) = vid.mode.width;
        PRVM_G_FLOAT(OFS_PARM1) = vid.mode.height;
    }
    /*
     * This should be fine for now but FTEQW uses flags for keydest
     * and checks that an array called "eyeoffset" is 0
     *
     * Just a note in case there's compatibility problems later
     */
    PRVM_G_FLOAT(OFS_PARM2) = key_dest == key_game;
    prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_UpdateView), "QC function CSQC_UpdateView is missing");
    //VectorCopy(oldangles, cl.viewangles);
    // Dresk : Reset Dmg Globals Here
    CL_VM_UpdateDmgGlobals(0, 0, emptyvector);
    r_refdef.view = csqc_main_r_refdef_view;
    R_RenderView_UpdateViewVectors(); // we have to do this, as we undid the scene render doing this for us
 
    R_TimeReport("UpdateView");
    return true;
}
 
void CL_VM_DrawHud(double frametime)
{
    prvm_prog_t *prog = CLVM_prog;
 
    R_TimeReport("pre-DrawHud");
 
    PRVM_clientglobalfloat(time) = cl.time;
    PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
    CSQC_SetGlobals(frametime);
 
    PRVM_GarbageCollection(prog);
 
    // width and height parameters are virtual in CSQC_SIMPLE engines
    VectorSet(PRVM_G_VECTOR(OFS_PARM0), vid_conwidth.integer, vid_conheight.integer, 0);
    PRVM_G_FLOAT(OFS_PARM1) = sb_showscores;
    prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_DrawHud), "QC function CSQC_DrawHud is missing");
 
    if (PRVM_clientfunction(CSQC_DrawScores))
    {
        VectorSet(PRVM_G_VECTOR(OFS_PARM0), vid_conwidth.integer, vid_conheight.integer, 0);
        PRVM_G_FLOAT(OFS_PARM1) = sb_showscores;
        if (key_dest != key_menu)
            prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_DrawScores), "QC function CSQC_DrawScores is missing");
    }
    else if (sb_showscores || (cl.stats[STAT_HEALTH] <= 0 && cl_deathscoreboard.integer))
        if (!cl.islocalgame) // LadyHavoc: changed to draw the deathmatch overlays in any multiplayer mode
            Sbar_DeathmatchOverlay ();
 
    R_TimeReport("DrawHud");
}
 
 
qbool CL_VM_ConsoleCommand(const char *text, size_t textlen)
{
    prvm_prog_t *prog = CLVM_prog;
    return PRVM_ConsoleCommand(prog, text, textlen, &prog->funcoffsets.CSQC_ConsoleCommand, false, cl.csqc_server2csqcentitynumber[cl.playerentity], cl.time, "QC function CSQC_ConsoleCommand is missing");
}
 
qbool CL_VM_Parse_TempEntity (void)
{
    prvm_prog_t *prog = CLVM_prog;
    int t;
    qbool r = false;
 
    if(!prog->loaded)
        return false;
 
    if(PRVM_clientfunction(CSQC_Parse_TempEntity))
    {
        t = cl_message.readcount;
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Parse_TempEntity), "QC function CSQC_Parse_TempEntity is missing");
        r = CSQC_RETURNVAL != 0;
        if(!r)
        {
            cl_message.readcount = t;
            cl_message.badread = false;
        }
    }
    return r;
}
 
void CL_VM_Parse_StuffCmd(const char *msg, size_t msg_len)
{
    prvm_prog_t *prog = CLVM_prog;
    int restorevm_tempstringsbuf_cursize;
 
    if(msg[0] == 'c')
    if(msg[1] == 's')
    if(msg[2] == 'q')
    if(msg[3] == 'c')
    {
        // if this is setting a csqc variable, deprotect csqc_progcrc
        // temporarily so that it can be set by the cvar command,
        // and then reprotect it afterwards
        int crcflags = csqc_progcrc.flags;
        csqc_progcrc.flags &= ~CF_READONLY;
        csqc_progsize.flags &= ~CF_READONLY;
        Cmd_ExecuteString(cmd_local, msg, msg_len, src_local, true);
        csqc_progcrc.flags = csqc_progsize.flags = crcflags;
        return;
    }
 
    if(!prog->loaded)
    {
        Cbuf_AddText(cmd_local, msg);
        return;
    }
 
    if(PRVM_clientfunction(CSQC_Parse_StuffCmd))
    {
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
        restorevm_tempstringsbuf_cursize = prog->tempstringsbuf.cursize;
        PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(prog, msg, msg_len);
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Parse_StuffCmd), "QC function CSQC_Parse_StuffCmd is missing");
        prog->tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
    }
    else
        Cbuf_AddText(cmd_local, msg);
}
 
static void CL_VM_Parse_Print(const char *msg, size_t msg_len)
{
    prvm_prog_t *prog = CLVM_prog;
    int restorevm_tempstringsbuf_cursize;
    PRVM_clientglobalfloat(time) = cl.time;
    PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
    restorevm_tempstringsbuf_cursize = prog->tempstringsbuf.cursize;
    PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(prog, msg, msg_len);
    prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Parse_Print), "QC function CSQC_Parse_Print is missing");
    prog->tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
}
 
void CSQC_AddPrintText(const char *msg, size_t msg_len)
{
    prvm_prog_t *prog = CLVM_prog;
    char *start = cl.csqc_printtextbuf + cl.csqc_printtextbuf_len;
    size_t writebytes = min(msg_len + 1, MAX_INPUTLINE - cl.csqc_printtextbuf_len);
 
    if(prog->loaded && PRVM_clientfunction(CSQC_Parse_Print))
    {
        if(msg[msg_len - 1] != '\n' && msg[msg_len - 1] != '\r')
        {
            if(cl.csqc_printtextbuf_len + msg_len + 1 >= MAX_INPUTLINE)
            {
                CL_VM_Parse_Print(cl.csqc_printtextbuf, cl.csqc_printtextbuf_len);
                cl.csqc_printtextbuf[0] = '\0';
                cl.csqc_printtextbuf_len = 0;
            }
            else
            {
                memcpy(start, msg, writebytes);
                cl.csqc_printtextbuf_len += msg_len;
            }
            return;
        }
        memcpy(start, msg, writebytes);
        cl.csqc_printtextbuf_len += msg_len;
        CL_VM_Parse_Print(cl.csqc_printtextbuf, cl.csqc_printtextbuf_len);
        cl.csqc_printtextbuf[0] = '\0';
        cl.csqc_printtextbuf_len = 0;
    }
    else
        Con_Print(msg);
}
 
void CL_VM_Parse_CenterPrint(const char *msg, size_t msg_len)
{
    prvm_prog_t *prog = CLVM_prog;
    int restorevm_tempstringsbuf_cursize;
 
    if(prog->loaded && PRVM_clientfunction(CSQC_Parse_CenterPrint))
    {
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
        restorevm_tempstringsbuf_cursize = prog->tempstringsbuf.cursize;
        PRVM_G_INT(OFS_PARM0) = PRVM_SetTempString(prog, msg, msg_len);
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Parse_CenterPrint), "QC function CSQC_Parse_CenterPrint is missing");
        prog->tempstringsbuf.cursize = restorevm_tempstringsbuf_cursize;
    }
    else
        SCR_CenterPrint(msg);
}
 
void CL_VM_UpdateIntermissionState (int intermission)
{
    prvm_prog_t *prog = CLVM_prog;
 
    if(prog->loaded)
        PRVM_clientglobalfloat(intermission) = intermission;
}
void CL_VM_UpdateShowingScoresState (int showingscores)
{
    prvm_prog_t *prog = CLVM_prog;
 
    if(prog->loaded)
        PRVM_clientglobalfloat(sb_showscores) = showingscores;
}
qbool CL_VM_Event_Sound(int sound_num, float fvolume, int channel, float attenuation, int ent, vec3_t pos, int flags, float speed)
{
    prvm_prog_t *prog = CLVM_prog;
    qbool r = false;
 
    if(prog->loaded)
    {
        if(PRVM_clientfunction(CSQC_Event_Sound))
        {
            PRVM_clientglobalfloat(time) = cl.time;
            PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
            PRVM_G_FLOAT(OFS_PARM0) = ent;
            PRVM_G_FLOAT(OFS_PARM1) = CHAN_ENGINE2USER(channel);
            PRVM_G_INT(OFS_PARM2) = PRVM_SetTempString(prog, cl.sound_name[sound_num], strlen(cl.sound_name[sound_num]));
            PRVM_G_FLOAT(OFS_PARM3) = fvolume;
            PRVM_G_FLOAT(OFS_PARM4) = attenuation;
            VectorCopy(pos, PRVM_G_VECTOR(OFS_PARM5) );
            PRVM_G_FLOAT(OFS_PARM6) = speed * 100.0f;
            PRVM_G_FLOAT(OFS_PARM7) = flags; // flags
            prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Event_Sound), "QC function CSQC_Event_Sound is missing");
            r = CSQC_RETURNVAL != 0;
        }
    }
 
    return r;
}
static void CL_VM_UpdateCoopDeathmatchGlobals (int gametype)
{
    prvm_prog_t *prog = CLVM_prog;
    // Avoid global names for clean(er) coding
    int localcoop;
    int localdeathmatch;
 
    if(prog->loaded)
    {
        if(gametype == GAME_COOP)
        {
            localcoop = 1;
            localdeathmatch = 0;
        }
        else if(gametype == GAME_DEATHMATCH)
        {
            localcoop = 0;
            localdeathmatch = 1;
        }
        else
        {
            // How did the ServerInfo send an unknown gametype?
            // Better just assign the globals as 0...
            localcoop = 0;
            localdeathmatch = 0;
        }
        PRVM_clientglobalfloat(coop) = localcoop;
        PRVM_clientglobalfloat(deathmatch) = localdeathmatch;
    }
}
#if 0
static float CL_VM_Event (float event)      //[515]: needed ? I'd say "YES", but don't know for what :D
{
    prvm_prog_t *prog = CLVM_prog;
    float r = 0;
 
    if(!prog->loaded)
        return 0;
 
    if(PRVM_clientfunction(CSQC_Event))
    {
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[cl.playerentity];
        PRVM_G_FLOAT(OFS_PARM0) = event;
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Event), "QC function CSQC_Event is missing");
        r = CSQC_RETURNVAL;
    }
    return r;
}
#endif
 
void CSQC_ReadEntities (void)
{
    prvm_prog_t *prog = CLVM_prog;
    unsigned short entnum, oldself, realentnum;
 
    if(!prog->loaded)
    {
        Host_Error ("CSQC_ReadEntities: CSQC is not loaded");
        return;
    }
 
    PRVM_clientglobalfloat(time) = cl.time;
    oldself = PRVM_clientglobaledict(self);
    while(1)
    {
        entnum = MSG_ReadShort(&cl_message);
        if(!entnum || cl_message.badread)
            break;
        realentnum = entnum & 0x7FFF;
        PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[realentnum];
        if(entnum & 0x8000)
        {
            if(PRVM_clientglobaledict(self))
            {
                prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Ent_Remove), "QC function CSQC_Ent_Remove is missing");
                cl.csqc_server2csqcentitynumber[realentnum] = 0;
            }
            else
            {
                // LadyHavoc: removing an entity that is already gone on
                // the csqc side is possible for legitimate reasons (such
                // as a repeat of the remove message), so no warning is
                // needed
                //Con_Printf("Bad csqc_server2csqcentitynumber map\n"); //[515]: never happens ?
            }
        }
        else
        {
            if(!PRVM_clientglobaledict(self))
            {
                if(!PRVM_clientfunction(CSQC_Ent_Spawn))
                {
                    prvm_edict_t    *ed;
                    ed = PRVM_ED_Alloc(prog);
                    PRVM_clientedictfloat(ed, entnum) = realentnum;
                    PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[realentnum] = PRVM_EDICT_TO_PROG(ed);
                }
                else
                {
                    // entity( float entnum ) CSQC_Ent_Spawn;
                    // the qc function should set entnum, too (this way it also can return world [2/1/2008 Andreas]
                    PRVM_G_FLOAT(OFS_PARM0) = (float) realentnum;
                    // make sure no one gets wrong ideas
                    PRVM_clientglobaledict(self) = 0;
                    prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Ent_Spawn), "QC function CSQC_Ent_Spawn is missing");
                    PRVM_clientglobaledict(self) = cl.csqc_server2csqcentitynumber[realentnum] = PRVM_EDICT( PRVM_G_INT( OFS_RETURN ) );
                }
                PRVM_G_FLOAT(OFS_PARM0) = 1;
                prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Ent_Update), "QC function CSQC_Ent_Update is missing");
            }
            else {
                PRVM_G_FLOAT(OFS_PARM0) = 0;
                prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Ent_Update), "QC function CSQC_Ent_Update is missing");
            }
        }
    }
    PRVM_clientglobaledict(self) = oldself;
}
 
static void CLVM_begin_increase_edicts(prvm_prog_t *prog)
{
    // links don't survive the transition, so unlink everything
    World_UnlinkAll(&cl.world);
}
 
static void CLVM_end_increase_edicts(prvm_prog_t *prog)
{
    int i;
    prvm_edict_t *ent;
 
    // link every entity except world
    for (i = 1, ent = prog->edicts;i < prog->num_edicts;i++, ent++)
        if (!ent->free)
            CL_LinkEdict(ent);
}
 
static void CLVM_init_edict(prvm_prog_t *prog, prvm_edict_t *e)
{
    int edictnum = PRVM_NUM_FOR_EDICT(e);
    entity_render_t *entrender;
    CL_ExpandCSQCRenderEntities(edictnum);
    entrender = cl.csqcrenderentities + edictnum;
    e->priv.server->move = false; // don't move on first frame
    memset(entrender, 0, sizeof(*entrender));
    entrender->shadertime = cl.time;
}
 
static void CLVM_free_edict(prvm_prog_t *prog, prvm_edict_t *ed)
{
    entity_render_t *entrender = cl.csqcrenderentities + PRVM_NUM_FOR_EDICT(ed);
    R_DecalSystem_Reset(&entrender->decalsystem);
    memset(entrender, 0, sizeof(*entrender));
    World_UnlinkEdict(ed);
    memset(ed->fields.fp, 0, prog->entityfields * sizeof(prvm_vec_t));
    VM_RemoveEdictSkeleton(prog, ed);
#ifdef USEODE
    World_Physics_RemoveFromEntity(&cl.world, ed);
    World_Physics_RemoveJointFromEntity(&cl.world, ed);
#endif
}
 
static void CLVM_count_edicts(prvm_prog_t *prog)
{
    int     i;
    prvm_edict_t    *ent;
    int     active = 0, models = 0, solid = 0;
 
    for (i=0 ; i<prog->num_edicts ; i++)
    {
        ent = PRVM_EDICT_NUM(i);
        if (ent->free)
            continue;
        active++;
        if (PRVM_clientedictfloat(ent, solid))
            solid++;
        if (PRVM_clientedictstring(ent, model))
            models++;
    }
 
    Con_Printf("num_edicts:%3i\n", prog->num_edicts);
    Con_Printf("active    :%3i\n", active);
    Con_Printf("view      :%3i\n", models);
    Con_Printf("touch     :%3i\n", solid);
}
 
static qbool CLVM_load_edict(prvm_prog_t *prog, prvm_edict_t *ent)
{
    return true;
}
 
// returns true if the packet is valid, false if end of file is reached
// used for dumping the CSQC download into demo files
qbool MakeDownloadPacket(const char *filename, unsigned char *data, size_t len, int crc, int cnt, sizebuf_t *buf, int protocol)
{
    int packetsize = buf->maxsize - 7; // byte short long
    int npackets = ((int)len + packetsize - 1) / (packetsize);
    char vabuf[1024];
 
    if(protocol == PROTOCOL_QUAKEWORLD)
        return false; // CSQC can't run in QW anyway
 
    SZ_Clear(buf);
    if(cnt == 0)
    {
        MSG_WriteByte(buf, svc_stufftext);
        MSG_WriteString(buf, va(vabuf, sizeof(vabuf), "\ncl_downloadbegin %lu %s\n", (unsigned long)len, filename));
        return true;
    }
    else if(cnt >= 1 && cnt <= npackets)
    {
        unsigned long thispacketoffset = (cnt - 1) * packetsize;
        int thispacketsize = (int)len - thispacketoffset;
        if(thispacketsize > packetsize)
            thispacketsize = packetsize;
 
        MSG_WriteByte(buf, svc_downloaddata);
        MSG_WriteLong(buf, thispacketoffset);
        MSG_WriteShort(buf, thispacketsize);
        SZ_Write(buf, data + thispacketoffset, thispacketsize);
 
        return true;
    }
    else if(cnt == npackets + 1)
    {
        MSG_WriteByte(buf, svc_stufftext);
        MSG_WriteString(buf, va(vabuf, sizeof(vabuf), "\ncl_downloadfinished %lu %d\n", (unsigned long)len, crc));
        return true;
    }
    return false;
}
 
extern cvar_t csqc_usedemoprogs;
void CL_VM_Init (void)
{
    prvm_prog_t *prog = CLVM_prog;
    const char* csprogsfn = NULL;
    unsigned char *csprogsdata = NULL;
    fs_offset_t csprogsdatasize = 0;
    int csprogsdatacrc, requiredcrc;
    int requiredsize;
    char vabuf[1024];
 
    // reset csqc_progcrc after reading it, so that changing servers doesn't
    // expect csqc on the next server
    requiredcrc = csqc_progcrc.integer;
    requiredsize = csqc_progsize.integer;
    Cvar_SetValueQuick(&csqc_progcrc, -1);
    Cvar_SetValueQuick(&csqc_progsize, -1);
 
    // if the server is not requesting a csprogs, then we're done here
    if (requiredcrc < 0)
        return;
 
    // see if the requested csprogs.dat file matches the requested crc
    if (!cls.demoplayback || csqc_usedemoprogs.integer)
    {
        csprogsfn = va(vabuf, sizeof(vabuf), "dlcache/%s.%i.%i", csqc_progname.string, requiredsize, requiredcrc);
        if(cls.caughtcsprogsdata && cls.caughtcsprogsdatasize == requiredsize && CRC_Block(cls.caughtcsprogsdata, (size_t)cls.caughtcsprogsdatasize) == requiredcrc)
        {
            Con_DPrintf("Using buffered \"%s\"\n", csprogsfn);
            csprogsdata = cls.caughtcsprogsdata;
            csprogsdatasize = cls.caughtcsprogsdatasize;
            cls.caughtcsprogsdata = NULL;
            cls.caughtcsprogsdatasize = 0;
        }
        else
        {
            Con_DPrintf("Not using buffered \"%s\" (buffered: %p, %d)\n", csprogsfn, (void *)cls.caughtcsprogsdata, (int) cls.caughtcsprogsdatasize);
            csprogsdata = FS_LoadFile(csprogsfn, tempmempool, true, &csprogsdatasize);
        }
    }
    if (!csprogsdata)
    {
        csprogsfn = csqc_progname.string;
        csprogsdata = FS_LoadFile(csprogsfn, tempmempool, true, &csprogsdatasize);
    }
    if (csprogsdata)
    {
        csprogsdatacrc = CRC_Block(csprogsdata, (size_t)csprogsdatasize);
        if (csprogsdatacrc != requiredcrc || csprogsdatasize != requiredsize)
        {
            if (cls.demoplayback)
            {
                Con_Printf(CON_WARN "Warning: Your %s is not the same version as the demo was recorded with (CRC/size are %i/%i but should be %i/%i)\n", csqc_progname.string, csprogsdatacrc, (int)csprogsdatasize, requiredcrc, requiredsize);
                // Mem_Free(csprogsdata);
                // return;
                // We WANT to continue here, and play the demo with different csprogs!
                // After all, this is just a warning. Sure things may go wrong from here.
            }
            else
            {
                Mem_Free(csprogsdata);
                CL_DisconnectEx(false, "Your %s is not the same version as the server (CRC is %i/%i but should be %i/%i)\n", csqc_progname.string, csprogsdatacrc, (int)csprogsdatasize, requiredcrc, requiredsize);
                return;
            }
        }
    }
    else
    {
        if (requiredcrc >= 0)
            CL_DisconnectEx(false, CON_ERROR "CL_VM_Init: %s requires CSQC, but \"%s\" wasn't found\n", cls.demoplayback ? "demo" : "server", csqc_progname.string);
        return;
    }
 
    PRVM_Prog_Init(prog, cmd_local);
 
    // allocate the mempools
    prog->progs_mempool = Mem_AllocPool(csqc_progname.string, 0, NULL);
    prog->edictprivate_size = 0; // no private struct used
    prog->name = "client";
    prog->num_edicts = 1;
    prog->max_edicts = 512;
    prog->limit_edicts = CL_MAX_EDICTS;
    prog->reserved_edicts = 0;
    prog->edictprivate_size = sizeof(edict_engineprivate_t);
    // TODO: add a shared extension string #define and add real support for csqc extension strings [12/5/2007 Black]
    prog->extensionstring = vm_sv_extensions;
    prog->builtins = vm_cl_builtins;
    prog->numbuiltins = vm_cl_numbuiltins;
 
    // all callbacks must be defined (pointers are not checked before calling)
    prog->begin_increase_edicts = CLVM_begin_increase_edicts;
    prog->end_increase_edicts   = CLVM_end_increase_edicts;
    prog->init_edict            = CLVM_init_edict;
    prog->free_edict            = CLVM_free_edict;
    prog->count_edicts          = CLVM_count_edicts;
    prog->load_edict            = CLVM_load_edict;
    prog->init_cmd              = CLVM_init_cmd;
    prog->reset_cmd             = CLVM_reset_cmd;
    prog->error_cmd             = Host_Error;
    prog->ExecuteProgram        = CLVM_ExecuteProgram;
 
    PRVM_Prog_Load(prog, csprogsfn, csprogsdata, csprogsdatasize, CL_CheckRequiredFuncs, CL_REQFIELDS, cl_reqfields, CL_REQGLOBALS, cl_reqglobals);
 
    if (!prog->loaded)
    {
        Mem_Free(csprogsdata);
        Host_Error("CSQC %s failed to load\n", csprogsfn);
    }
 
    if(cls.demorecording)
    {
        if(cls.demo_lastcsprogssize != csprogsdatasize || cls.demo_lastcsprogscrc != csprogsdatacrc)
        {
            int i;
            static char buf[NET_MAXMESSAGE];
            sizebuf_t sb;
            unsigned char *demobuf; fs_offset_t demofilesize;
 
            sb.data = (unsigned char *) buf;
            sb.maxsize = sizeof(buf);
            i = 0;
 
            CL_CutDemo(&demobuf, &demofilesize);
            while(MakeDownloadPacket(csqc_progname.string, csprogsdata, (size_t)csprogsdatasize, csprogsdatacrc, i++, &sb, cls.protocol))
                CL_WriteDemoMessage(&sb);
            CL_PasteDemo(&demobuf, &demofilesize);
 
            cls.demo_lastcsprogssize = csprogsdatasize;
            cls.demo_lastcsprogscrc = csprogsdatacrc;
        }
    }
    Mem_Free(csprogsdata);
 
    // check if OP_STATE animation is possible in this dat file
    if (prog->fieldoffsets.nextthink >= 0 && prog->fieldoffsets.frame >= 0 && prog->fieldoffsets.think >= 0 && prog->globaloffsets.self >= 0)
        prog->flag |= PRVM_OP_STATE;
 
    // set time
    PRVM_clientglobalfloat(time) = cl.time;
    PRVM_clientglobaledict(self) = 0;
 
    PRVM_clientglobalstring(mapname) = PRVM_SetEngineString(prog, cl.worldbasename);
    PRVM_clientglobalfloat(player_localnum) = cl.realplayerentity - 1;
    PRVM_clientglobalfloat(player_localentnum) = cl.viewentity;
 
    // set map description (use world entity 0)
    PRVM_clientedictstring(prog->edicts, message) = PRVM_SetEngineString(prog, cl.worldmessage);
    VectorCopy(cl.world.mins, PRVM_clientedictvector(prog->edicts, mins));
    VectorCopy(cl.world.maxs, PRVM_clientedictvector(prog->edicts, maxs));
    VectorCopy(cl.world.mins, PRVM_clientedictvector(prog->edicts, absmin));
    VectorCopy(cl.world.maxs, PRVM_clientedictvector(prog->edicts, absmax));
    PRVM_clientedictfloat(prog->edicts, solid) = SOLID_BSP;
    PRVM_clientedictfloat(prog->edicts, modelindex) = 1;
    PRVM_clientedictstring(prog->edicts, model) = PRVM_SetEngineString(prog, cl.worldmodel->name);
 
    // call the prog init if it exists
    if (PRVM_clientfunction(CSQC_Init))
    {
        PRVM_G_FLOAT(OFS_PARM0) = 1.0f; // CSQC_SIMPLE engines always pass 0, FTE always passes 1
        // always include "DarkPlaces" so it can be recognised when gamename doesn't include it
        PRVM_G_INT(OFS_PARM1) = PRVM_SetEngineString(prog, va(vabuf, sizeof(vabuf), "DarkPlaces %s", gamename));
        PRVM_G_FLOAT(OFS_PARM2) = 1.0f; // TODO DP versions...
        prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Init), "QC function CSQC_Init is missing");
    }
 
    // Once CSQC_Init was called, we consider csqc code fully initialized.
    prog->inittime = host.realtime;
 
    cl.csqc_vidvars.drawcrosshair = false;
    cl.csqc_vidvars.drawenginesbar = false;
 
    // Update Coop and Deathmatch Globals (at this point the client knows them from ServerInfo)
    CL_VM_UpdateCoopDeathmatchGlobals(cl.gametype);
}
 
void CL_VM_ShutDown (void)
{
    prvm_prog_t *prog = CLVM_prog;
    Cmd_ClearCSQCCommands(cmd_local);
 
    //Cvar_SetValueQuick(&csqc_progcrc, -1);
    //Cvar_SetValueQuick(&csqc_progsize, -1);
    if (prog->loaded)
    {
        PRVM_clientglobalfloat(time) = cl.time;
        PRVM_clientglobaledict(self) = 0;
        if (PRVM_clientfunction(CSQC_Shutdown))
            prog->ExecuteProgram(prog, PRVM_clientfunction(CSQC_Shutdown), "QC function CSQC_Shutdown is missing");
    }
    PRVM_Prog_Reset(prog);
    Con_DPrint("CSQC ^1unloaded\n");
}
 
qbool CL_VM_GetEntitySoundOrigin(int entnum, vec3_t out)
{
    prvm_prog_t *prog = CLVM_prog;
    prvm_edict_t *ed;
    model_t *mod;
    matrix4x4_t matrix;
    qbool r = 0;
 
    ed = PRVM_EDICT_NUM(entnum - MAX_EDICTS);
 
    if(!ed->free)
    {
        mod = CL_GetModelFromEdict(ed);
        VectorCopy(PRVM_clientedictvector(ed, origin), out);
        if(CL_GetTagMatrix(prog, &matrix, ed, 0, NULL) == 0)
            Matrix4x4_OriginFromMatrix(&matrix, out);
        if (mod && mod->soundfromcenter)
            VectorMAMAM(1.0f, out, 0.5f, mod->normalmins, 0.5f, mod->normalmaxs, out);
        r = 1;
    }
 
    return r;
}
 
qbool CL_VM_TransformView(int entnum, matrix4x4_t *viewmatrix, mplane_t *clipplane, vec3_t visorigin)
{
    prvm_prog_t *prog = CLVM_prog;
    qbool ret = false;
    prvm_edict_t *ed;
    vec3_t forward, left, up, origin, ang;
    matrix4x4_t mat, matq;
 
    ed = PRVM_EDICT_NUM(entnum);
    // camera:
    //   camera_transform
    if(PRVM_clientedictfunction(ed, camera_transform))
    {
        ret = true;
        if(viewmatrix && clipplane && visorigin)
        {
            Matrix4x4_ToVectors(viewmatrix, forward, left, up, origin);
            AnglesFromVectors(ang, forward, up, false);
            PRVM_clientglobalfloat(time) = cl.time;
            PRVM_clientglobaledict(self) = entnum;
            VectorCopy(origin, PRVM_G_VECTOR(OFS_PARM0));
            VectorCopy(ang, PRVM_G_VECTOR(OFS_PARM1));
            VectorCopy(forward, PRVM_clientglobalvector(v_forward));
            VectorScale(left, -1, PRVM_clientglobalvector(v_right));
            VectorCopy(up, PRVM_clientglobalvector(v_up));
            VectorCopy(origin, PRVM_clientglobalvector(trace_endpos));
            prog->ExecuteProgram(prog, PRVM_clientedictfunction(ed, camera_transform), "QC function e.camera_transform is missing");
            VectorCopy(PRVM_G_VECTOR(OFS_RETURN), origin);
            VectorCopy(PRVM_clientglobalvector(v_forward), forward);
            VectorScale(PRVM_clientglobalvector(v_right), -1, left);
            VectorCopy(PRVM_clientglobalvector(v_up), up);
            VectorCopy(PRVM_clientglobalvector(trace_endpos), visorigin);
            Matrix4x4_Invert_Full(&mat, viewmatrix);
            Matrix4x4_FromVectors(viewmatrix, forward, left, up, origin);
            Matrix4x4_Concat(&matq, viewmatrix, &mat);
            Matrix4x4_TransformPositivePlane(&matq, clipplane->normal[0], clipplane->normal[1], clipplane->normal[2], clipplane->dist, clipplane->normal_and_dist);
        }
    }
 
    return ret;
}
 
int CL_VM_GetViewEntity(void)
{
    if(cl.csqc_server2csqcentitynumber[cl.viewentity])
        return cl.csqc_server2csqcentitynumber[cl.viewentity] + MAX_EDICTS;
    return cl.viewentity;
}