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-rw-r--r--code/renderer/tr_flares.c124
-rw-r--r--code/renderer/tr_init.c2
-rw-r--r--code/renderer/tr_local.h3
-rw-r--r--code/renderer/tr_shader.c11
-rw-r--r--code/renderer/tr_surface.c67
5 files changed, 121 insertions, 86 deletions
diff --git a/code/renderer/tr_flares.c b/code/renderer/tr_flares.c
index 65fb2ba..51181c0 100644
--- a/code/renderer/tr_flares.c
+++ b/code/renderer/tr_flares.c
@@ -75,6 +75,7 @@ typedef struct flare_s {
int windowX, windowY;
float eyeZ;
+ vec3_t origin;
vec3_t color;
} flare_t;
@@ -83,6 +84,8 @@ typedef struct flare_s {
flare_t r_flareStructs[MAX_FLARES];
flare_t *r_activeFlares, *r_inactiveFlares;
+int flareCoeff;
+
/*
==================
R_ClearFlares
@@ -113,11 +116,22 @@ void RB_AddFlare( void *surface, int fogNum, vec3_t point, vec3_t color, vec3_t
int i;
flare_t *f, *oldest;
vec3_t local;
- float d;
+ float d = 1;
vec4_t eye, clip, normalized, window;
backEnd.pc.c_flareAdds++;
+ if(normal && (normal[0] || normal[1] || normal[2]))
+ {
+ VectorSubtract( backEnd.viewParms.or.origin, point, local );
+ VectorNormalizeFast(local);
+ d = DotProduct(local, normal);
+
+ // If the viewer is behind the flare don't add it.
+ if(d < 0)
+ return;
+ }
+
// if the point is off the screen, don't bother adding it
// calculate screen coordinates and depth
R_TransformModelToClip( point, backEnd.or.modelMatrix,
@@ -171,16 +185,12 @@ void RB_AddFlare( void *surface, int fogNum, vec3_t point, vec3_t color, vec3_t
f->addedFrame = backEnd.viewParms.frameCount;
f->fogNum = fogNum;
+ VectorCopy(point, f->origin);
VectorCopy( color, f->color );
// fade the intensity of the flare down as the
// light surface turns away from the viewer
- if ( normal ) {
- VectorSubtract( backEnd.viewParms.or.origin, point, local );
- VectorNormalizeFast( local );
- d = DotProduct( local, normal );
- VectorScale( f->color, d, f->color );
- }
+ VectorScale( f->color, d, f->color );
// save info needed to test
f->windowX = backEnd.viewParms.viewportX + window[0];
@@ -197,31 +207,39 @@ RB_AddDlightFlares
void RB_AddDlightFlares( void ) {
dlight_t *l;
int i, j, k;
- fog_t *fog;
+ fog_t *fog = NULL;
if ( !r_flares->integer ) {
return;
}
l = backEnd.refdef.dlights;
- fog = tr.world->fogs;
+
+ if(tr.world)
+ fog = tr.world->fogs;
+
for (i=0 ; i<backEnd.refdef.num_dlights ; i++, l++) {
- // find which fog volume the light is in
- for ( j = 1 ; j < tr.world->numfogs ; j++ ) {
- fog = &tr.world->fogs[j];
- for ( k = 0 ; k < 3 ; k++ ) {
- if ( l->origin[k] < fog->bounds[0][k] || l->origin[k] > fog->bounds[1][k] ) {
+ if(fog)
+ {
+ // find which fog volume the light is in
+ for ( j = 1 ; j < tr.world->numfogs ; j++ ) {
+ fog = &tr.world->fogs[j];
+ for ( k = 0 ; k < 3 ; k++ ) {
+ if ( l->origin[k] < fog->bounds[0][k] || l->origin[k] > fog->bounds[1][k] ) {
+ break;
+ }
+ }
+ if ( k == 3 ) {
break;
}
}
- if ( k == 3 ) {
- break;
+ if ( j == tr.world->numfogs ) {
+ j = 0;
}
}
- if ( j == tr.world->numfogs ) {
+ else
j = 0;
- }
RB_AddFlare( (void *)l, j, l->origin, l->color, NULL );
}
@@ -294,16 +312,61 @@ void RB_RenderFlare( flare_t *f ) {
float size;
vec3_t color;
int iColor[3];
+ float distance, intensity, factor;
+ byte fogFactors[3] = {255, 255, 255};
backEnd.pc.c_flareRenders++;
- VectorScale( f->color, f->drawIntensity*tr.identityLight, color );
- iColor[0] = color[0] * 255;
- iColor[1] = color[1] * 255;
- iColor[2] = color[2] * 255;
+ // We don't want too big values anyways when dividing by distance.
+ if(f->eyeZ > -1.0f)
+ distance = 1.0f;
+ else
+ distance = -f->eyeZ;
+
+ // calculate the flare size..
+ size = backEnd.viewParms.viewportWidth * ( r_flareSize->value/640.0f + 8 / distance );
+
+/*
+ * This is an alternative to intensity scaling. It changes the size of the flare on screen instead
+ * with growing distance. See in the description at the top why this is not the way to go.
+ // size will change ~ 1/r.
+ size = backEnd.viewParms.viewportWidth * (r_flareSize->value / (distance * -2.0f));
+*/
- size = backEnd.viewParms.viewportWidth * ( r_flareSize->value/640.0f + 8 / -f->eyeZ );
+/*
+ * As flare sizes stay nearly constant with increasing distance we must decrease the intensity
+ * to achieve a reasonable visual result. The intensity is ~ (size^2 / distance^2) which can be
+ * got by considering the ratio of
+ * (flaresurface on screen) : (Surface of sphere defined by flare origin and distance from flare)
+ * An important requirement is:
+ * intensity <= 1 for all distances.
+ *
+ * The formula used here to compute the intensity is as follows:
+ * intensity = flareCoeff * size^2 / (distance + size*sqrt(flareCoeff))^2
+ * As you can see, the intensity will have a max. of 1 when the distance is 0.
+ * The coefficient flareCoeff will determine the falloff speed with increasing distance.
+ */
+
+ factor = distance + size * sqrt(flareCoeff);
+
+ intensity = flareCoeff * size * size / (factor * factor);
+
+ VectorScale(f->color, f->drawIntensity * tr.identityLight * intensity, color);
+
+// Calculations for fogging
+ if(f->fogNum)
+ {
+ tess.numVertexes = 1;
+ VectorCopy(f->origin, tess.xyz[0]);
+ tess.fogNum = f->fogNum;
+
+ RB_CalcModulateColorsByFog(fogFactors);
+ }
+ iColor[0] = color[0] * fogFactors[0];
+ iColor[1] = color[1] * fogFactors[1];
+ iColor[2] = color[2] * fogFactors[2];
+
RB_BeginSurface( tr.flareShader, f->fogNum );
// FIXME: use quadstamp?
@@ -382,6 +445,21 @@ void RB_RenderFlares (void) {
return;
}
+ if(r_flareCoeff->modified)
+ {
+ if(r_flareCoeff->value == 0.0f)
+ flareCoeff = atof(FLARE_STDCOEFF);
+ else
+ flareCoeff = r_flareCoeff->value;
+
+ r_flareCoeff->modified = qfalse;
+ }
+
+ // Reset currentEntity to world so that any previously referenced entities
+ // don't have influence on the rendering of these flares (i.e. RF_ renderer flags).
+ backEnd.currentEntity = &tr.worldEntity;
+ backEnd.or = backEnd.viewParms.world;
+
// RB_AddDlightFlares();
// perform z buffer readback on each flare in this view
diff --git a/code/renderer/tr_init.c b/code/renderer/tr_init.c
index 70b969c..bf234b4 100644
--- a/code/renderer/tr_init.c
+++ b/code/renderer/tr_init.c
@@ -30,6 +30,7 @@ static void GfxInfo_f( void );
cvar_t *r_flareSize;
cvar_t *r_flareFade;
+cvar_t *r_flareCoeff;
cvar_t *r_railWidth;
cvar_t *r_railCoreWidth;
@@ -997,6 +998,7 @@ void R_Register( void )
r_flareSize = ri.Cvar_Get ("r_flareSize", "40", CVAR_CHEAT);
r_flareFade = ri.Cvar_Get ("r_flareFade", "7", CVAR_CHEAT);
+ r_flareCoeff = ri.Cvar_Get ("r_flareCoeff", FLARE_STDCOEFF, CVAR_CHEAT);
r_showSmp = ri.Cvar_Get ("r_showSmp", "0", CVAR_CHEAT);
r_skipBackEnd = ri.Cvar_Get ("r_skipBackEnd", "0", CVAR_CHEAT);
diff --git a/code/renderer/tr_local.h b/code/renderer/tr_local.h
index 1b47f96..0fecbcd 100644
--- a/code/renderer/tr_local.h
+++ b/code/renderer/tr_local.h
@@ -976,6 +976,9 @@ extern glstate_t glState; // outside of TR since it shouldn't be cleared during
//
extern cvar_t *r_flareSize;
extern cvar_t *r_flareFade;
+// coefficient for the flare intensity falloff function.
+#define FLARE_STDCOEFF "150"
+extern cvar_t *r_flareCoeff;
extern cvar_t *r_railWidth;
extern cvar_t *r_railCoreWidth;
diff --git a/code/renderer/tr_shader.c b/code/renderer/tr_shader.c
index ddcbfca..a489459 100644
--- a/code/renderer/tr_shader.c
+++ b/code/renderer/tr_shader.c
@@ -3010,6 +3010,17 @@ static void CreateInternalShaders( void ) {
static void CreateExternalShaders( void ) {
tr.projectionShadowShader = R_FindShader( "projectionShadow", LIGHTMAP_NONE, qtrue );
tr.flareShader = R_FindShader( "flareShader", LIGHTMAP_NONE, qtrue );
+
+ // Hack to make fogging work correctly on flares. Fog colors are calculated
+ // in tr_flare.c already.
+ if(!tr.flareShader->defaultShader)
+ {
+ int index;
+
+ for(index = 0; index < tr.flareShader->numUnfoggedPasses; index++)
+ tr.flareShader->stages[index]->adjustColorsForFog = ACFF_NONE;
+ }
+
tr.sunShader = R_FindShader( "sun", LIGHTMAP_NONE, qtrue );
}
diff --git a/code/renderer/tr_surface.c b/code/renderer/tr_surface.c
index c95e6b2..a1346c8 100644
--- a/code/renderer/tr_surface.c
+++ b/code/renderer/tr_surface.c
@@ -1214,71 +1214,12 @@ void RB_SurfaceBad( surfaceType_t *surfType ) {
ri.Printf( PRINT_ALL, "Bad surface tesselated.\n" );
}
-#if 0
-
-void RB_SurfaceFlare( srfFlare_t *surf ) {
- vec3_t left, up;
- float radius;
- byte color[4];
- vec3_t dir;
- vec3_t origin;
- float d;
-
- // calculate the xyz locations for the four corners
- radius = 30;
- VectorScale( backEnd.viewParms.or.axis[1], radius, left );
- VectorScale( backEnd.viewParms.or.axis[2], radius, up );
- if ( backEnd.viewParms.isMirror ) {
- VectorSubtract( vec3_origin, left, left );
- }
-
- color[0] = color[1] = color[2] = color[3] = 255;
-
- VectorMA( surf->origin, 3, surf->normal, origin );
- VectorSubtract( origin, backEnd.viewParms.or.origin, dir );
- VectorNormalize( dir );
- VectorMA( origin, r_ignore->value, dir, origin );
-
- d = -DotProduct( dir, surf->normal );
- if ( d < 0 ) {
- return;
- }
-#if 0
- color[0] *= d;
- color[1] *= d;
- color[2] *= d;
-#endif
-
- RB_AddQuadStamp( origin, left, up, color );
-}
-
-#else
-
-void RB_SurfaceFlare( srfFlare_t *surf ) {
-#if 0
- vec3_t left, up;
- byte color[4];
-
- color[0] = surf->color[0] * 255;
- color[1] = surf->color[1] * 255;
- color[2] = surf->color[2] * 255;
- color[3] = 255;
-
- VectorClear( left );
- VectorClear( up );
-
- left[0] = r_ignore->value;
-
- up[1] = r_ignore->value;
-
- RB_AddQuadStampExt( surf->origin, left, up, color, 0, 0, 1, 1 );
-#endif
+void RB_SurfaceFlare(srfFlare_t *surf)
+{
+ if (r_flares->integer)
+ RB_AddFlare(surf, tess.fogNum, surf->origin, surf->color, surf->normal);
}
-#endif
-
-
-
void RB_SurfaceDisplayList( srfDisplayList_t *surf ) {
// all apropriate state must be set in RB_BeginSurface
// this isn't implemented yet...
generated by cgit v1.2.3 (git 2.39.1) at 2025-11-04 16:14:02 +0000