gl_light.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

/*
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.

*/
// r_light.c

#include "gl_local.h"

int	r_dlightframecount;

#define	DLIGHT_CUTOFF	64

/*
=============================================================================

DYNAMIC LIGHTS BLEND RENDERING

=============================================================================
*/

void R_RenderDlight (dlight_t *light)
{
	int		i, j;
	float	a;
	vec3_t	v;
	float	rad;

	rad = light->intensity * 0.35;

	VectorSubtract (light->origin, r_origin, v);
#if 0
	// FIXME?
	if (VectorLength (v) < rad)
	{	// view is inside the dlight
		V_AddBlend (light->color[0], light->color[1], light->color[2], light->intensity * 0.0003, v_blend);
		return;
	}
#endif

	qglBegin (GL_TRIANGLE_FAN);
	qglColor3f (light->color[0]*0.2, light->color[1]*0.2, light->color[2]*0.2);
	for (i=0 ; i<3 ; i++)
		v[i] = light->origin[i] - vpn[i]*rad;
	qglVertex3fv (v);
	qglColor3f (0,0,0);
	for (i=16 ; i>=0 ; i--)
	{
		a = i/16.0 * M_PI*2;
		for (j=0 ; j<3 ; j++)
			v[j] = light->origin[j] + vright[j]*cos(a)*rad
				+ vup[j]*sin(a)*rad;
		qglVertex3fv (v);
	}
	qglEnd ();
}

/*
=============
R_RenderDlights
=============
*/
void R_RenderDlights (void)
{
	int		i;
	dlight_t	*l;

	if (!gl_flashblend->value)
		return;

	r_dlightframecount = r_framecount + 1;	// because the count hasn't
											//  advanced yet for this frame
	qglDepthMask (0);
	qglDisable (GL_TEXTURE_2D);
	qglShadeModel (GL_SMOOTH);
	qglEnable (GL_BLEND);
	qglBlendFunc (GL_ONE, GL_ONE);

	l = r_newrefdef.dlights;
	for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
		R_RenderDlight (l);

	qglColor3f (1,1,1);
	qglDisable (GL_BLEND);
	qglEnable (GL_TEXTURE_2D);
	qglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	qglDepthMask (1);
}


/*
=============================================================================

DYNAMIC LIGHTS

=============================================================================
*/

/*
=============
R_MarkLights
=============
*/
void R_MarkLights (dlight_t *light, int bit, mnode_t *node)
{
	cplane_t	*splitplane;
	float		dist;
	msurface_t	*surf;
	int			i;
	
	if (node->contents != -1)
		return;

	splitplane = node->plane;
	dist = DotProduct (light->origin, splitplane->normal) - splitplane->dist;
	
	if (dist > light->intensity-DLIGHT_CUTOFF)
	{
		R_MarkLights (light, bit, node->children[0]);
		return;
	}
	if (dist < -light->intensity+DLIGHT_CUTOFF)
	{
		R_MarkLights (light, bit, node->children[1]);
		return;
	}
		
// mark the polygons
	surf = r_worldmodel->surfaces + node->firstsurface;
	for (i=0 ; i<node->numsurfaces ; i++, surf++)
	{
		if (surf->dlightframe != r_dlightframecount)
		{
			surf->dlightbits = 0;
			surf->dlightframe = r_dlightframecount;
		}
		surf->dlightbits |= bit;
	}

	R_MarkLights (light, bit, node->children[0]);
	R_MarkLights (light, bit, node->children[1]);
}


/*
=============
R_PushDlights
=============
*/
void R_PushDlights (void)
{
	int		i;
	dlight_t	*l;

	if (gl_flashblend->value)
		return;

	r_dlightframecount = r_framecount + 1;	// because the count hasn't
											//  advanced yet for this frame
	l = r_newrefdef.dlights;
	for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
		R_MarkLights ( l, 1<<i, r_worldmodel->nodes );
}


/*
=============================================================================

LIGHT SAMPLING

=============================================================================
*/

vec3_t			pointcolor;
cplane_t		*lightplane;		// used as shadow plane
vec3_t			lightspot;

int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
{
	float		front, back, frac;
	int			side;
	cplane_t	*plane;
	vec3_t		mid;
	msurface_t	*surf;
	int			s, t, ds, dt;
	int			i;
	mtexinfo_t	*tex;
	byte		*lightmap;
	int			maps;
	int			r;

	if (node->contents != -1)
		return -1;		// didn't hit anything
	
// calculate mid point

// FIXME: optimize for axial
	plane = node->plane;
	front = DotProduct (start, plane->normal) - plane->dist;
	back = DotProduct (end, plane->normal) - plane->dist;
	side = front < 0;
	
	if ( (back < 0) == side)
		return RecursiveLightPoint (node->children[side], start, end);
	
	frac = front / (front-back);
	mid[0] = start[0] + (end[0] - start[0])*frac;
	mid[1] = start[1] + (end[1] - start[1])*frac;
	mid[2] = start[2] + (end[2] - start[2])*frac;
	
// go down front side	
	r = RecursiveLightPoint (node->children[side], start, mid);
	if (r >= 0)
		return r;		// hit something
		
	if ( (back < 0) == side )
		return -1;		// didn't hit anuthing
		
// check for impact on this node
	VectorCopy (mid, lightspot);
	lightplane = plane;

	surf = r_worldmodel->surfaces + node->firstsurface;
	for (i=0 ; i<node->numsurfaces ; i++, surf++)
	{
		if (surf->flags&(SURF_DRAWTURB|SURF_DRAWSKY)) 
			continue;	// no lightmaps

		tex = surf->texinfo;
		
		s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
		t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];;

		if (s < surf->texturemins[0] ||
		t < surf->texturemins[1])
			continue;
		
		ds = s - surf->texturemins[0];
		dt = t - surf->texturemins[1];
		
		if ( ds > surf->extents[0] || dt > surf->extents[1] )
			continue;

		if (!surf->samples)
			return 0;

		ds >>= 4;
		dt >>= 4;

		lightmap = surf->samples;
		VectorCopy (vec3_origin, pointcolor);
		if (lightmap)
		{
			vec3_t scale;

			lightmap += 3*(dt * ((surf->extents[0]>>4)+1) + ds);

			for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
					maps++)
			{
				for (i=0 ; i<3 ; i++)
					scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];

				pointcolor[0] += lightmap[0] * scale[0] * (1.0/255);
				pointcolor[1] += lightmap[1] * scale[1] * (1.0/255);
				pointcolor[2] += lightmap[2] * scale[2] * (1.0/255);
				lightmap += 3*((surf->extents[0]>>4)+1) *
						((surf->extents[1]>>4)+1);
			}
		}
		
		return 1;
	}

// go down back side
	return RecursiveLightPoint (node->children[!side], mid, end);
}

/*
===============
R_LightPoint
===============
*/
void R_LightPoint (vec3_t p, vec3_t color)
{
	vec3_t		end;
	float		r;
	int			lnum;
	dlight_t	*dl;
	float		light;
	vec3_t		dist;
	float		add;
	
	if (!r_worldmodel->lightdata)
	{
		color[0] = color[1] = color[2] = 1.0;
		return;
	}
	
	end[0] = p[0];
	end[1] = p[1];
	end[2] = p[2] - 2048;
	
	r = RecursiveLightPoint (r_worldmodel->nodes, p, end);
	
	if (r == -1)
	{
		VectorCopy (vec3_origin, color);
	}
	else
	{
		VectorCopy (pointcolor, color);
	}

	//
	// add dynamic lights
	//
	light = 0;
	dl = r_newrefdef.dlights;
	for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++, dl++)
	{
		VectorSubtract (currententity->origin,
						dl->origin,
						dist);
		add = dl->intensity - VectorLength(dist);
		add *= (1.0/256);
		if (add > 0)
		{
			VectorMA (color, add, dl->color, color);
		}
	}

	VectorScale (color, gl_modulate->value, color);
}


//===================================================================

static float s_blocklights[34*34*3];
/*
===============
R_AddDynamicLights
===============
*/
void R_AddDynamicLights (msurface_t *surf)
{
	int			lnum;
	int			sd, td;
	float		fdist, frad, fminlight;
	vec3_t		impact, local;
	int			s, t;