1 files changed, 354 insertions, 0 deletions
diff --git a/WinQuake/gl_rlight.c b/WinQuake/gl_rlight.c
new file mode 100644
index 0000000..80ada45
--- /dev/null
+++ b/WinQuake/gl_rlight.c
@@ -0,0 +1,354 @@
+/*
+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_light.c
+
+#include "quakedef.h"
+
+int	r_dlightframecount;
+
+
+/*
+==================
+R_AnimateLight
+==================
+*/
+void R_AnimateLight (void)
+{
+	int			i,j,k;
+	
+//
+// light animations
+// 'm' is normal light, 'a' is no light, 'z' is double bright
+	i = (int)(cl.time*10);
+	for (j=0 ; j<MAX_LIGHTSTYLES ; j++)
+	{
+		if (!cl_lightstyle[j].length)
+		{
+			d_lightstylevalue[j] = 256;
+			continue;
+		}
+		k = i % cl_lightstyle[j].length;
+		k = cl_lightstyle[j].map[k] - 'a';
+		k = k*22;
+		d_lightstylevalue[j] = k;
+	}	
+}
+
+/*
+=============================================================================
+
+DYNAMIC LIGHTS BLEND RENDERING
+
+=============================================================================
+*/
+
+void AddLightBlend (float r, float g, float b, float a2)
+{
+	float	a;
+
+	v_blend[3] = a = v_blend[3] + a2*(1-v_blend[3]);
+
+	a2 = a2/a;
+
+	v_blend[0] = v_blend[1]*(1-a2) + r*a2;
+	v_blend[1] = v_blend[1]*(1-a2) + g*a2;
+	v_blend[2] = v_blend[2]*(1-a2) + b*a2;
+}
+
+void R_RenderDlight (dlight_t *light)
+{
+	int		i, j;
+	float	a;
+	vec3_t	v;
+	float	rad;
+
+	rad = light->radius * 0.35;
+
+	VectorSubtract (light->origin, r_origin, v);
+	if (Length (v) < rad)
+	{	// view is inside the dlight
+		AddLightBlend (1, 0.5, 0, light->radius * 0.0003);
+		return;
+	}
+
+	glBegin (GL_TRIANGLE_FAN);
+	glColor3f (0.2,0.1,0.0);
+	for (i=0 ; i<3 ; i++)
+		v[i] = light->origin[i] - vpn[i]*rad;
+	glVertex3fv (v);
+	glColor3f (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;
+		glVertex3fv (v);
+	}
+	glEnd ();
+}
+
+/*
+=============
+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
+	glDepthMask (0);
+	glDisable (GL_TEXTURE_2D);
+	glShadeModel (GL_SMOOTH);
+	glEnable (GL_BLEND);
+	glBlendFunc (GL_ONE, GL_ONE);
+
+	l = cl_dlights;
+	for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
+	{
+		if (l->die < cl.time || !l->radius)
+			continue;
+		R_RenderDlight (l);
+	}
+
+	glColor3f (1,1,1);
+	glDisable (GL_BLEND);
+	glEnable (GL_TEXTURE_2D);
+	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glDepthMask (1);
+}
+
+
+/*
+=============================================================================
+
+DYNAMIC LIGHTS
+
+=============================================================================
+*/
+
+/*
+=============
+R_MarkLights
+=============
+*/
+void R_MarkLights (dlight_t *light, int bit, mnode_t *node)
+{
+	mplane_t	*splitplane;
+	float		dist;
+	msurface_t	*surf;
+	int			i;
+	
+	if (node->contents < 0)
+		return;
+
+	splitplane = node->plane;
+	dist = DotProduct (light->origin, splitplane->normal) - splitplane->dist;
+	
+	if (dist > light->radius)
+	{
+		R_MarkLights (light, bit, node->children[0]);
+		return;
+	}
+	if (dist < -light->radius)
+	{
+		R_MarkLights (light, bit, node->children[1]);
+		return;
+	}
+		
+// mark the polygons
+	surf = cl.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 = cl_dlights;
+
+	for (i=0 ; i<MAX_DLIGHTS ; i++, l++)
+	{
+		if (l->die < cl.time || !l->radius)
+			continue;
+		R_MarkLights ( l, 1<<i, cl.worldmodel->nodes );
+	}
+}
+
+
+/*
+=============================================================================
+
+LIGHT SAMPLING
+
+=============================================================================
+*/
+
+mplane_t		*lightplane;
+vec3_t			lightspot;
+
+int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
+{
+	int			r;
+	float		front, back, frac;
+	int			side;
+	mplane_t	*plane;
+	vec3_t		mid;
+	msurface_t	*surf;
+	int			s, t, ds, dt;
+	int			i;
+	mtexinfo_t	*tex;
+	byte		*lightmap;
+	unsigned	scale;
+	int			maps;
+
+	if (node->contents < 0)
+		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 = cl.worldmodel->surfaces + node->firstsurface;
+	for (i=0 ; i<node->numsurfaces ; i++, surf++)
+	{
+		if (surf->flags & SURF_DRAWTILED)
+			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;
+		r = 0;
+		if (lightmap)
+		{
+
+			lightmap += dt * ((surf->extents[0]>>4)+1) + ds;
+
+			for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
+					maps++)
+			{
+				scale = d_lightstylevalue[surf->styles[maps]];
+				r += *lightmap * scale;
+				lightmap += ((surf->extents[0]>>4)+1) *
+						((surf->extents[1]>>4)+1);
+			}
+			
+			r >>= 8;
+		}
+		
+		return r;
+	}
+
+// go down back side
+	return RecursiveLightPoint (node->children[!side], mid, end);
+}
+
+int R_LightPoint (vec3_t p)
+{
+	vec3_t		end;
+	int			r;
+	
+	if (!cl.worldmodel->lightdata)
+		return 255;
+	
+	end[0] = p[0];
+	end[1] = p[1];
+	end[2] = p[2] - 2048;
+	
+	r = RecursiveLightPoint (cl.worldmodel->nodes, p, end);
+	
+	if (r == -1)
+		r = 0;
+
+	return r;
+}
+