/*
Copyright (C) 1996-1997 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.

*/
// r_misc.c

#include "quakedef.h"
#include "r_local.h"


/*
===============
R_CheckVariables
===============
*/
void R_CheckVariables(void)
{
    static float	oldbright;

    if (r_fullbright.value != oldbright) {
        oldbright = r_fullbright.value;
        D_FlushCaches();	// so all lighting changes
    }
}


/*
============
Show

Debugging use
============
*/
void Show(void)
{
    vrect_t	vr;

    vr.x = vr.y = 0;
    vr.width = vid.width;
    vr.height = vid.height;
    vr.pnext = NULL;
    VID_Update(&vr);
}


/*
====================
R_TimeRefresh_f

For program optimization
====================
*/
void R_TimeRefresh_f(void)
{
    int			i;
    float		start, stop, time;
    int			startangle;
    vrect_t		vr;

    startangle = r_refdef.viewangles[1];

    start = Sys_FloatTime();
    for (i=0 ; i<128 ; i++) {
        r_refdef.viewangles[1] = i/128.0*360.0;

        VID_LockBuffer();

        R_RenderView();

        VID_UnlockBuffer();

        vr.x = r_refdef.vrect.x;
        vr.y = r_refdef.vrect.y;
        vr.width = r_refdef.vrect.width;
        vr.height = r_refdef.vrect.height;
        vr.pnext = NULL;
        VID_Update(&vr);
    }
    stop = Sys_FloatTime();
    time = stop-start;
    Con_Printf("%f seconds (%f fps)\n", time, 128/time);

    r_refdef.viewangles[1] = startangle;
}


/*
================
R_LineGraph

Only called by R_DisplayTime
================
*/
void R_LineGraph(int x, int y, int h)
{
    int		i;
    pixel_t	*dest;
    int		s;

// FIXME: should be disabled on no-buffer adapters, or should be in the driver

    x += r_refdef.vrect.x;
    y += r_refdef.vrect.y;

    dest = vid.buffer + vid.width*y + x;

    s = r_graphheight.value;

    if (h>s) {
        h = s;
    }

    for (i=0 ; i<h ; i++, dest -= vid.rowbytes*2) {
        dest[0] = 0xff;
        *(dest-vid.rowbytes) = 0x30;
    }
    for (; i<s ; i++, dest -= vid.rowbytes*2) {
        dest[0] = 0x30;
        *(dest-vid.rowbytes) = 0x30;
    }
}

/*
==============
R_TimeGraph

Performance monitoring tool
==============
*/
#define	MAX_TIMINGS		100
extern float mouse_x, mouse_y;
void R_TimeGraph(void)
{
    static	int		timex;
    int		a;
    float	r_time2;
    static byte	r_timings[MAX_TIMINGS];
    int		x;

    r_time2 = Sys_FloatTime();

    a = (r_time2-r_time1)/0.01;
//a = fabs(mouse_y * 0.05);
//a = (int)((r_refdef.vieworg[2] + 1024)/1)%(int)r_graphheight.value;
//a = fabs(velocity[0])/20;
//a = ((int)fabs(origin[0])/8)%20;
//a = (cl.idealpitch + 30)/5;
    r_timings[timex] = a;
    a = timex;

    if (r_refdef.vrect.width <= MAX_TIMINGS) {
        x = r_refdef.vrect.width-1;
    } else
        x = r_refdef.vrect.width -
            (r_refdef.vrect.width - MAX_TIMINGS)/2;
    do {
        R_LineGraph(x, r_refdef.vrect.height-2, r_timings[a]);
        if (x==0) {
            break;    // screen too small to hold entire thing
        }
        x--;
        a--;
        if (a == -1) {
            a = MAX_TIMINGS-1;
        }
    } while (a != timex);

    timex = (timex+1)%MAX_TIMINGS;
}


/*
=============
R_PrintTimes
=============
*/
void R_PrintTimes(void)
{
    float	r_time2;
    float		ms;

    r_time2 = Sys_FloatTime();

    ms = 1000* (r_time2 - r_time1);

    Con_Printf("%5.1f ms %3i/%3i/%3i poly %3i surf\n",
               ms, c_faceclip, r_polycount, r_drawnpolycount, c_surf);
    c_surf = 0;
}


/*
=============
R_PrintDSpeeds
=============
*/
void R_PrintDSpeeds(void)
{
    float	ms, dp_time, r_time2, rw_time, db_time, se_time, de_time, dv_time;

    r_time2 = Sys_FloatTime();

    dp_time = (dp_time2 - dp_time1) * 1000;
    rw_time = (rw_time2 - rw_time1) * 1000;
    db_time = (db_time2 - db_time1) * 1000;
    se_time = (se_time2 - se_time1) * 1000;
    de_time = (de_time2 - de_time1) * 1000;
    dv_time = (dv_time2 - dv_time1) * 1000;
    ms = (r_time2 - r_time1) * 1000;

    Con_Printf("%3i %4.1fp %3iw %4.1fb %3is %4.1fe %4.1fv\n",
               (int)ms, dp_time, (int)rw_time, db_time, (int)se_time, de_time,
               dv_time);
}


/*
=============
R_PrintAliasStats
=============
*/
void R_PrintAliasStats(void)
{
    Con_Printf("%3i polygon model drawn\n", r_amodels_drawn);
}


void WarpPalette(void)
{
    int		i,j;
    byte	newpalette[768];
    int		basecolor[3];

    basecolor[0] = 130;
    basecolor[1] = 80;
    basecolor[2] = 50;

// pull the colors halfway to bright brown
    for (i=0 ; i<256 ; i++) {
        for (j=0 ; j<3 ; j++) {
            newpalette[i*3+j] = (host_basepal[i*3+j] + basecolor[j])/2;
        }
    }

    VID_ShiftPalette(newpalette);
}


/*
===================
R_TransformFrustum
===================
*/
void R_TransformFrustum(void)
{
    int		i;
    vec3_t	v, v2;

    for (i=0 ; i<4 ; i++) {
        v[0] = screenedge[i].normal[2];
        v[1] = -screenedge[i].normal[0];
        v[2] = screenedge[i].normal[1];

        v2[0] = v[1]*vright[0] + v[2]*vup[0] + v[0]*vpn[0];
        v2[1] = v[1]*vright[1] + v[2]*vup[1] + v[0]*vpn[1];
        v2[2] = v[1]*vright[2] + v[2]*vup[2] + v[0]*vpn[2];

        VectorCopy(v2, view_clipplanes[i].normal);

        view_clipplanes[i].dist = DotProduct(modelorg, v2);
    }
}


#if	!id386

/*
================
TransformVector
================
*/
void TransformVector(vec3_t in, vec3_t out)
{
    out[0] = DotProduct(in,vright);
    out[1] = DotProduct(in,vup);
    out[2] = DotProduct(in,vpn);
}

#endif


/*
================
R_TransformPlane
================
*/
void R_TransformPlane(mplane_t *p, float *normal, float *dist)
{
    float	d;

    d = DotProduct(r_origin, p->normal);
    *dist = p->dist - d;
// TODO: when we have rotating entities, this will need to use the view matrix
    TransformVector(p->normal, normal);
}


/*
===============
R_SetUpFrustumIndexes
===============
*/
void R_SetUpFrustumIndexes(void)
{
    int		i, j, *pindex;

    pindex = r_frustum_indexes;

    for (i=0 ; i<4 ; i++) {
        for (j=0 ; j<3 ; j++) {
            if (view_clipplanes[i].normal[j] < 0) {
                pindex[j] = j;
                pindex[j+3] = j+3;
            } else {
                pindex[j] = j+3;
                pindex[j+3] = j;
            }
        }

        // FIXME: do just once at start
        pfrustum_indexes[i] = pindex;
        pindex += 6;
    }
}


/*
===============
R_SetupFrame
===============
*/
void R_SetupFrame(void)
{
    int				edgecount;
    vrect_t			vrect;
    float			w, h;

// don't allow cheats in multiplayer
    if (cl.maxclients > 1) {
        Cvar_Set("r_draworder", "0");
        Cvar_Set("r_fullbright", "0");
        Cvar_Set("r_ambient", "0");
        Cvar_Set("r_drawflat", "0");
    }

    if (r_numsurfs.value) {
        if ((surface_p - surfaces) > r_maxsurfsseen) {
            r_maxsurfsseen = surface_p - surfaces;
        }

        Con_Printf("Used %d of %d surfs; %d max\n", surface_p - surfaces,
                   surf_max - surfaces, r_maxsurfsseen);
    }

    if (r_numedges.value) {
        edgecount = edge_p - r_edges;

        if (edgecount > r_maxedgesseen) {
            r_maxedgesseen = edgecount;
        }

        Con_Printf("Used %d of %d edges; %d max\n", edgecount,
                   r_numallocatededges, r_maxedgesseen);
    }

    r_refdef.ambientlight = r_ambient.value;

    if (r_refdef.ambientlight < 0) {
        r_refdef.ambientlight = 0;
    }

    if (!sv.active) {
        r_draworder.value = 0;    // don't let cheaters look behind walls
    }

    R_CheckVariables();

    R_AnimateLight();

    r_framecount++;

    numbtofpolys = 0;

// debugging
#if 0
    r_refdef.vieworg[0]=  80;
    r_refdef.vieworg[1]=      64;
    r_refdef.vieworg[2]=      40;
    r_refdef.viewangles[0]=    0;
    r_refdef.viewangles[1]=    46.763641357;
    r_refdef.viewangles[2]=    0;
#endif

// build the transformation matrix for the given view angles
    VectorCopy(r_refdef.vieworg, modelorg);
    VectorCopy(r_refdef.vieworg, r_origin);

    AngleVectors(r_refdef.viewangles, vpn, vright, vup);

// current viewleaf
    r_oldviewleaf = r_viewleaf;
    r_viewleaf = Mod_PointInLeaf(r_origin, cl.worldmodel);

    r_dowarpold = r_dowarp;
    r_dowarp = r_waterwarp.value && (r_viewleaf->contents <= CONTENTS_WATER);

    if ((r_dowarp != r_dowarpold) || r_viewchanged || lcd_x.value) {
        if (r_dowarp) {
            if ((vid.width <= vid.maxwarpwidth) &&
                    (vid.height <= vid.maxwarpheight)) {
                vrect.x = 0;
                vrect.y = 0;
                vrect.width = vid.width;
                vrect.height = vid.height;

                R_ViewChanged(&vrect, sb_lines, vid.aspect);
            } else {
                w = vid.width;
                h = vid.height;

                if (w > vid.maxwarpwidth) {
                    h *= (float)vid.maxwarpwidth / w;
                    w = vid.maxwarpwidth;
                }

                if (h > vid.maxwarpheight) {
                    h = vid.maxwarpheight;
                    w *= (float)vid.maxwarpheight / h;
                }

                vrect.x = 0;
                vrect.y = 0;
                vrect.width = (int)w;
                vrect.height = (int)h;

                R_ViewChanged(&vrect,
                              (int)((float)sb_lines *(h/(float)vid.height)),
                              vid.aspect *(h / w) *
                              ((float)vid.width / (float)vid.height));
            }
        } else {
            vrect.x = 0;
            vrect.y = 0;
            vrect.width = vid.width;
            vrect.height = vid.height;

            R_ViewChanged(&vrect, sb_lines, vid.aspect);
        }

        r_viewchanged = false;
    }

// start off with just the four screen edge clip planes
    R_TransformFrustum();

// save base values
    VectorCopy(vpn, base_vpn);
    VectorCopy(vright, base_vright);
    VectorCopy(vup, base_vup);
    VectorCopy(modelorg, base_modelorg);

    R_SetSkyFrame();

    R_SetUpFrustumIndexes();

    r_cache_thrash = false;

// clear frame counts
    c_faceclip = 0;
    d_spanpixcount = 0;
    r_polycount = 0;
    r_drawnpolycount = 0;
    r_wholepolycount = 0;
    r_amodels_drawn = 0;
    r_outofsurfaces = 0;
    r_outofedges = 0;

    D_SetupFrame();
}

