cl_view.cpp

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/*
All original material Copyright (C) 2002-2025 UFO: Alien Invasion.
 
Original file from Quake 2 v3.21: quake2-2.31/client/cl_view.c
Copyright (C) 1997-2001 Id Software, Inc.
 
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 "../client.h"
#include "../cl_screen.h"
#include "../cgame/cl_game.h"
#include "cl_particle.h"
#include "cl_localentity.h"
#include "cl_actor.h"
#include "cl_hud.h"
#include "cl_spawn.h"
#include "cl_view.h"
#include "../renderer/r_main.h"
#include "../renderer/r_entity.h"
 
cvar_t* cl_map_debug;
static cvar_t* cl_precache;
static cvar_t* cl_map_displayavailablecells;

void CL_ViewLoadMedia (void)
{
    CL_ViewUpdateRenderData();
 
    if (CL_GetConfigString(CS_TILES)[0] == '\0')
        return;                 /* no map loaded */
 
    GAME_InitMissionBriefing(_(CL_GetConfigString(CS_MAPTITLE)));
 
    float loadingPercent = 0;
 
    /* register models, pics, and skins */
    SCR_DrawLoading(loadingPercent);
    R_ModBeginLoading(CL_GetConfigString(CS_TILES), CL_GetConfigStringInteger(CS_LIGHTMAP),
            CL_GetConfigString(CS_POSITIONS), CL_GetConfigString(CS_NAME), CL_GetConfigString(CS_MAPZONE));
    CL_SpawnParseEntitystring();
 
    loadingPercent += 10.0f;
    SCR_DrawLoading(loadingPercent);
 
    LM_Register();
    CL_ParticleRegisterArt();
 
    int  max = 0;
    for (int i = 1; i < MAX_MODELS && CL_GetConfigString(CS_MODELS + i)[0] != '\0'; i++)
        max++;
 
    max += csi.numODs;
 
    for (int i = 1; i < MAX_MODELS; i++) {
        const char* name = CL_GetConfigString(CS_MODELS + i);
        if (name[0] == '\0')
            break;
        SCR_DrawLoading(loadingPercent);
        cl.model_draw[i] = R_FindModel(name);
        if (!cl.model_draw[i]) {
            Cmd_ExecuteString("fs_info");
            Com_Error(ERR_DROP, "Could not load model '%s'\n", name);
        }
 
        /* initialize clipping for bmodels */
        if (name[0] == '*')
            cl.model_clip[i] = CM_InlineModel(cl.mapTiles, name);
        else
            cl.model_clip[i] = nullptr;
 
        loadingPercent += 100.0f / (float)max;
    }
 
    /* update le model references */
    le_t* le = nullptr;
    while ((le = LE_GetNextInUse(le))) {
        if (le->modelnum1 > 0)
            le->model1 = LE_GetDrawModel(le->modelnum1);
        if (le->modelnum2 > 0)
            le->model2 = LE_GetDrawModel(le->modelnum2);
    }
 
    refdef.ready = true;
 
    /* waiting for EV_START */
    SCR_EndLoadingPlaque();
}

static float CL_PrecacheCharacterModels (float alreadyLoadedPercent)
{
    if (!cl_precache->integer)
        return 0;
 
    const float percent = 40.0f;
    /* search the name */
    for (int i = 0; i < csi.numTeamDefs; i++) {
        teamDef_t* td = &csi.teamDef[i];
        for (int j = NAME_NEUTRAL; j < NAME_LAST; j++) {
            /* search one of the model definitions */
            for (linkedList_t const* list = td->models[j]; list; list = list->next) {
                teamDef_t::model_t const& m = *static_cast<teamDef_t::model_t const*>(list->data);
                /* register body */
                char model[MAX_QPATH];
                Com_sprintf(model, sizeof(model), "%s/%s", m.path, m.body);
                if (!R_FindModel(model))
                    Com_Printf("Com_PrecacheCharacterModels: Could not register model %s\n", model);
                /* register head */
                Com_sprintf(model, sizeof(model), "%s/%s", m.path, m.head);
                if (!R_FindModel(model))
                    Com_Printf("Com_PrecacheCharacterModels: Could not register model %s\n", model);
 
                alreadyLoadedPercent += percent / (td->numModels[j] * csi.numTeamDefs * NAME_LAST);
                SCR_DrawLoadingScreen(true, alreadyLoadedPercent);
            }
        }
    }
    /* some genders may not have models - ensure that we do the wanted percent step */
    return percent;
}

void CL_ViewPrecacheModels (void)
{
    float percent = 30.0f;
    float alreadyLoadedPercent = 30.0f;
 
    const float loaded = CL_PrecacheCharacterModels(alreadyLoadedPercent);
    alreadyLoadedPercent += loaded;
    if (loaded == 0)
        percent = 100 - alreadyLoadedPercent;
 
    for (int i = 0; i < csi.numODs; i++) {
        const objDef_t* od = INVSH_GetItemByIDX(i);
 
        alreadyLoadedPercent += percent / csi.numODs;
        SCR_DrawLoadingScreen(true, alreadyLoadedPercent);
 
        if (od->type[0] == '\0' || od->isDummy)
            continue;
 
        if (od->model[0] != '\0') {
            cls.modelPool[i] = R_FindModel(od->model);
            if (cls.modelPool[i])
                Com_DPrintf(DEBUG_CLIENT, "CL_PrecacheModels: Registered object model: '%s' (%i)\n", od->model, i);
        }
    }
 
    /* now make sure that all the precached models are stored until we quit the game
     * otherwise they would be freed with every map change */
    R_SwitchModelMemPoolTag();
 
    SCR_DrawLoadingScreen(false, 100.f);
}

void CL_ViewCalcFieldOfViewX (void)
{
    if (cl_isometric->integer) {
        const float zoom =  3.6 * (cl.cam.zoom - cl_camzoommin->value) + 0.3 * cl_camzoommin->value;
        refdef.fieldOfViewX = std::max(std::min(FOV / zoom, 140.0), 1.0);
    } else {
        refdef.fieldOfViewX = std::max(std::min(FOV / cl.cam.zoom, 95.0), 55.0);
    }
}

static inline void CL_ViewCalcFieldOfViewY (const float width, const float height)
{
    refdef.fieldOfViewY = atan(tan(refdef.fieldOfViewX * (M_PI / 360.0)) * (height / width)) * (360.0 / M_PI);
}

void CL_ViewUpdateRenderData (void)
{
    VectorCopy(cl.cam.camorg, refdef.viewOrigin);
    VectorCopy(cl.cam.angles, refdef.viewAngles);
 
    CL_ViewCalcFieldOfViewY(viddef.viewWidth, viddef.viewHeight);
 
    /* setup refdef */
    refdef.time = cl.time * 0.001;
    refdef.worldlevel = cl_worldlevel->integer;
}

void CL_ViewRender (void)
{
    refdef.brushCount = 0;
    refdef.aliasCount = 0;
    refdef.batchCount = 0;
    refdef.FFPToShaderCount = 0;
    refdef.shaderToShaderCount = 0;
    refdef.shaderToFFPCount = 0;
 
    if (cls.state != ca_active)
        return;
 
    if (!viddef.viewWidth || !viddef.viewHeight)
        return;
 
    /* still loading */
    if (!refdef.ready)
        return;
 
    refdef.numEntities = 0;
    refdef.mapTiles = cl.mapTiles;
 
    /* tell the bsp thread to start */
    r_threadstate.state = THREAD_BSP;
    /* make sure we are really rendering the world */
    refdef.rendererFlags &= ~RDF_NOWORLDMODEL;
    /* add local models to the renderer chain */
    LM_AddToScene();
    /* add local entities to the renderer chain */
    LE_AddToScene();
 
    /* adds pathing data */
    if (cl_map_displayavailablecells->integer) {
        CL_AddActorPathing();
    }
 
    if (cl_map_debug->integer) {
        if (cl_map_debug->integer & MAPDEBUG_PATHING)
            CL_AddPathing();
        /* adds floor arrows */
        if (cl_map_debug->integer & MAPDEBUG_CELLS)
            CL_DisplayFloorArrows();
        /* adds wall arrows */
        if (cl_map_debug->integer & MAPDEBUG_WALLS)
            CL_DisplayObstructionArrows();
    }
 
 
    /* adds target cursor */
    CL_AddTargeting();
 
    /* update ref def */
    CL_ViewUpdateRenderData();
 
    /* render the world */
    R_RenderFrame();
}

void CL_ViewCenterAtGridPosition (const pos3_t pos)
{
    vec3_t vec;
 
    PosToVec(pos, vec);
    VectorCopy(vec, cl.cam.origin);
    Cvar_SetValue("cl_worldlevel", pos[2]);
}
 
void CL_ViewInit (void)
{
    cl_precache = Cvar_Get("cl_precache", "0", CVAR_ARCHIVE, "Precache character models at startup - more memory usage but smaller loading times in the game");
    cl_map_displayavailablecells = Cvar_Get("cl_map_displayavailablecells", "0", 0, "Display cells where a soldier can move");
    cl_map_draw_rescue_zone = Cvar_Get("cl_map_draw_rescue_zone", "2", 0, "Draw rescue zone: 1 - draw perimeter, 2 - draw circles on the ground, 3 - draw both");
}