// 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;
	R_RenderView();
	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;
    byte *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.rowbytes * 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);
    }
}


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

/*
================
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) {
	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);

    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();
}
