diff options
Diffstat (limited to 'code/renderer/tr_flares.c')
| -rwxr-xr-x | code/renderer/tr_flares.c | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/code/renderer/tr_flares.c b/code/renderer/tr_flares.c new file mode 100755 index 0000000..3ef4c58 --- /dev/null +++ b/code/renderer/tr_flares.c @@ -0,0 +1,447 @@ +/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code 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.
+
+Quake III Arena source code 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 Foobar; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+===========================================================================
+*/
+// tr_flares.c
+
+#include "tr_local.h"
+
+/*
+=============================================================================
+
+LIGHT FLARES
+
+A light flare is an effect that takes place inside the eye when bright light
+sources are visible. The size of the flare reletive to the screen is nearly
+constant, irrespective of distance, but the intensity should be proportional to the
+projected area of the light source.
+
+A surface that has been flagged as having a light flare will calculate the depth
+buffer value that it's midpoint should have when the surface is added.
+
+After all opaque surfaces have been rendered, the depth buffer is read back for
+each flare in view. If the point has not been obscured by a closer surface, the
+flare should be drawn.
+
+Surfaces that have a repeated texture should never be flagged as flaring, because
+there will only be a single flare added at the midpoint of the polygon.
+
+To prevent abrupt popping, the intensity of the flare is interpolated up and
+down as it changes visibility. This involves scene to scene state, unlike almost
+all other aspects of the renderer, and is complicated by the fact that a single
+frame may have multiple scenes.
+
+RB_RenderFlares() will be called once per view (twice in a mirrored scene, potentially
+up to five or more times in a frame with 3D status bar icons).
+
+=============================================================================
+*/
+
+
+// flare states maintain visibility over multiple frames for fading
+// layers: view, mirror, menu
+typedef struct flare_s {
+ struct flare_s *next; // for active chain
+
+ int addedFrame;
+
+ qboolean inPortal; // true if in a portal view of the scene
+ int frameSceneNum;
+ void *surface;
+ int fogNum;
+
+ int fadeTime;
+
+ qboolean visible; // state of last test
+ float drawIntensity; // may be non 0 even if !visible due to fading
+
+ int windowX, windowY;
+ float eyeZ;
+
+ vec3_t color;
+} flare_t;
+
+#define MAX_FLARES 128
+
+flare_t r_flareStructs[MAX_FLARES];
+flare_t *r_activeFlares, *r_inactiveFlares;
+
+/*
+==================
+R_ClearFlares
+==================
+*/
+void R_ClearFlares( void ) {
+ int i;
+
+ Com_Memset( r_flareStructs, 0, sizeof( r_flareStructs ) );
+ r_activeFlares = NULL;
+ r_inactiveFlares = NULL;
+
+ for ( i = 0 ; i < MAX_FLARES ; i++ ) {
+ r_flareStructs[i].next = r_inactiveFlares;
+ r_inactiveFlares = &r_flareStructs[i];
+ }
+}
+
+
+/*
+==================
+RB_AddFlare
+
+This is called at surface tesselation time
+==================
+*/
+void RB_AddFlare( void *surface, int fogNum, vec3_t point, vec3_t color, vec3_t normal ) {
+ int i;
+ flare_t *f, *oldest;
+ vec3_t local;
+ float d;
+ vec4_t eye, clip, normalized, window;
+
+ backEnd.pc.c_flareAdds++;
+
+ // if the point is off the screen, don't bother adding it
+ // calculate screen coordinates and depth
+ R_TransformModelToClip( point, backEnd.or.modelMatrix,
+ backEnd.viewParms.projectionMatrix, eye, clip );
+
+ // check to see if the point is completely off screen
+ for ( i = 0 ; i < 3 ; i++ ) {
+ if ( clip[i] >= clip[3] || clip[i] <= -clip[3] ) {
+ return;
+ }
+ }
+
+ R_TransformClipToWindow( clip, &backEnd.viewParms, normalized, window );
+
+ if ( window[0] < 0 || window[0] >= backEnd.viewParms.viewportWidth
+ || window[1] < 0 || window[1] >= backEnd.viewParms.viewportHeight ) {
+ return; // shouldn't happen, since we check the clip[] above, except for FP rounding
+ }
+
+ // see if a flare with a matching surface, scene, and view exists
+ oldest = r_flareStructs;
+ for ( f = r_activeFlares ; f ; f = f->next ) {
+ if ( f->surface == surface && f->frameSceneNum == backEnd.viewParms.frameSceneNum
+ && f->inPortal == backEnd.viewParms.isPortal ) {
+ break;
+ }
+ }
+
+ // allocate a new one
+ if (!f ) {
+ if ( !r_inactiveFlares ) {
+ // the list is completely full
+ return;
+ }
+ f = r_inactiveFlares;
+ r_inactiveFlares = r_inactiveFlares->next;
+ f->next = r_activeFlares;
+ r_activeFlares = f;
+
+ f->surface = surface;
+ f->frameSceneNum = backEnd.viewParms.frameSceneNum;
+ f->inPortal = backEnd.viewParms.isPortal;
+ f->addedFrame = -1;
+ }
+
+ if ( f->addedFrame != backEnd.viewParms.frameCount - 1 ) {
+ f->visible = qfalse;
+ f->fadeTime = backEnd.refdef.time - 2000;
+ }
+
+ f->addedFrame = backEnd.viewParms.frameCount;
+ f->fogNum = fogNum;
+
+ 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 );
+ }
+
+ // save info needed to test
+ f->windowX = backEnd.viewParms.viewportX + window[0];
+ f->windowY = backEnd.viewParms.viewportY + window[1];
+
+ f->eyeZ = eye[2];
+}
+
+/*
+==================
+RB_AddDlightFlares
+==================
+*/
+void RB_AddDlightFlares( void ) {
+ dlight_t *l;
+ int i, j, k;
+ fog_t *fog;
+
+ if ( !r_flares->integer ) {
+ return;
+ }
+
+ l = backEnd.refdef.dlights;
+ 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] ) {
+ break;
+ }
+ }
+ if ( k == 3 ) {
+ break;
+ }
+ }
+ if ( j == tr.world->numfogs ) {
+ j = 0;
+ }
+
+ RB_AddFlare( (void *)l, j, l->origin, l->color, NULL );
+ }
+}
+
+/*
+===============================================================================
+
+FLARE BACK END
+
+===============================================================================
+*/
+
+/*
+==================
+RB_TestFlare
+==================
+*/
+void RB_TestFlare( flare_t *f ) {
+ float depth;
+ qboolean visible;
+ float fade;
+ float screenZ;
+
+ backEnd.pc.c_flareTests++;
+
+ // doing a readpixels is as good as doing a glFinish(), so
+ // don't bother with another sync
+ glState.finishCalled = qfalse;
+
+ // read back the z buffer contents
+ qglReadPixels( f->windowX, f->windowY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth );
+
+ screenZ = backEnd.viewParms.projectionMatrix[14] /
+ ( ( 2*depth - 1 ) * backEnd.viewParms.projectionMatrix[11] - backEnd.viewParms.projectionMatrix[10] );
+
+ visible = ( -f->eyeZ - -screenZ ) < 24;
+
+ if ( visible ) {
+ if ( !f->visible ) {
+ f->visible = qtrue;
+ f->fadeTime = backEnd.refdef.time - 1;
+ }
+ fade = ( ( backEnd.refdef.time - f->fadeTime ) /1000.0f ) * r_flareFade->value;
+ } else {
+ if ( f->visible ) {
+ f->visible = qfalse;
+ f->fadeTime = backEnd.refdef.time - 1;
+ }
+ fade = 1.0f - ( ( backEnd.refdef.time - f->fadeTime ) / 1000.0f ) * r_flareFade->value;
+ }
+
+ if ( fade < 0 ) {
+ fade = 0;
+ }
+ if ( fade > 1 ) {
+ fade = 1;
+ }
+
+ f->drawIntensity = fade;
+}
+
+
+/*
+==================
+RB_RenderFlare
+==================
+*/
+void RB_RenderFlare( flare_t *f ) {
+ float size;
+ vec3_t color;
+ int iColor[3];
+
+ 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;
+
+ size = backEnd.viewParms.viewportWidth * ( r_flareSize->value/640.0f + 8 / -f->eyeZ );
+
+ RB_BeginSurface( tr.flareShader, f->fogNum );
+
+ // FIXME: use quadstamp?
+ tess.xyz[tess.numVertexes][0] = f->windowX - size;
+ tess.xyz[tess.numVertexes][1] = f->windowY - size;
+ tess.texCoords[tess.numVertexes][0][0] = 0;
+ tess.texCoords[tess.numVertexes][0][1] = 0;
+ tess.vertexColors[tess.numVertexes][0] = iColor[0];
+ tess.vertexColors[tess.numVertexes][1] = iColor[1];
+ tess.vertexColors[tess.numVertexes][2] = iColor[2];
+ tess.vertexColors[tess.numVertexes][3] = 255;
+ tess.numVertexes++;
+
+ tess.xyz[tess.numVertexes][0] = f->windowX - size;
+ tess.xyz[tess.numVertexes][1] = f->windowY + size;
+ tess.texCoords[tess.numVertexes][0][0] = 0;
+ tess.texCoords[tess.numVertexes][0][1] = 1;
+ tess.vertexColors[tess.numVertexes][0] = iColor[0];
+ tess.vertexColors[tess.numVertexes][1] = iColor[1];
+ tess.vertexColors[tess.numVertexes][2] = iColor[2];
+ tess.vertexColors[tess.numVertexes][3] = 255;
+ tess.numVertexes++;
+
+ tess.xyz[tess.numVertexes][0] = f->windowX + size;
+ tess.xyz[tess.numVertexes][1] = f->windowY + size;
+ tess.texCoords[tess.numVertexes][0][0] = 1;
+ tess.texCoords[tess.numVertexes][0][1] = 1;
+ tess.vertexColors[tess.numVertexes][0] = iColor[0];
+ tess.vertexColors[tess.numVertexes][1] = iColor[1];
+ tess.vertexColors[tess.numVertexes][2] = iColor[2];
+ tess.vertexColors[tess.numVertexes][3] = 255;
+ tess.numVertexes++;
+
+ tess.xyz[tess.numVertexes][0] = f->windowX + size;
+ tess.xyz[tess.numVertexes][1] = f->windowY - size;
+ tess.texCoords[tess.numVertexes][0][0] = 1;
+ tess.texCoords[tess.numVertexes][0][1] = 0;
+ tess.vertexColors[tess.numVertexes][0] = iColor[0];
+ tess.vertexColors[tess.numVertexes][1] = iColor[1];
+ tess.vertexColors[tess.numVertexes][2] = iColor[2];
+ tess.vertexColors[tess.numVertexes][3] = 255;
+ tess.numVertexes++;
+
+ tess.indexes[tess.numIndexes++] = 0;
+ tess.indexes[tess.numIndexes++] = 1;
+ tess.indexes[tess.numIndexes++] = 2;
+ tess.indexes[tess.numIndexes++] = 0;
+ tess.indexes[tess.numIndexes++] = 2;
+ tess.indexes[tess.numIndexes++] = 3;
+
+ RB_EndSurface();
+}
+
+/*
+==================
+RB_RenderFlares
+
+Because flares are simulating an occular effect, they should be drawn after
+everything (all views) in the entire frame has been drawn.
+
+Because of the way portals use the depth buffer to mark off areas, the
+needed information would be lost after each view, so we are forced to draw
+flares after each view.
+
+The resulting artifact is that flares in mirrors or portals don't dim properly
+when occluded by something in the main view, and portal flares that should
+extend past the portal edge will be overwritten.
+==================
+*/
+void RB_RenderFlares (void) {
+ flare_t *f;
+ flare_t **prev;
+ qboolean draw;
+
+ if ( !r_flares->integer ) {
+ return;
+ }
+
+// RB_AddDlightFlares();
+
+ // perform z buffer readback on each flare in this view
+ draw = qfalse;
+ prev = &r_activeFlares;
+ while ( ( f = *prev ) != NULL ) {
+ // throw out any flares that weren't added last frame
+ if ( f->addedFrame < backEnd.viewParms.frameCount - 1 ) {
+ *prev = f->next;
+ f->next = r_inactiveFlares;
+ r_inactiveFlares = f;
+ continue;
+ }
+
+ // don't draw any here that aren't from this scene / portal
+ f->drawIntensity = 0;
+ if ( f->frameSceneNum == backEnd.viewParms.frameSceneNum
+ && f->inPortal == backEnd.viewParms.isPortal ) {
+ RB_TestFlare( f );
+ if ( f->drawIntensity ) {
+ draw = qtrue;
+ } else {
+ // this flare has completely faded out, so remove it from the chain
+ *prev = f->next;
+ f->next = r_inactiveFlares;
+ r_inactiveFlares = f;
+ continue;
+ }
+ }
+
+ prev = &f->next;
+ }
+
+ if ( !draw ) {
+ return; // none visible
+ }
+
+ if ( backEnd.viewParms.isPortal ) {
+ qglDisable (GL_CLIP_PLANE0);
+ }
+
+ qglPushMatrix();
+ qglLoadIdentity();
+ qglMatrixMode( GL_PROJECTION );
+ qglPushMatrix();
+ qglLoadIdentity();
+ qglOrtho( backEnd.viewParms.viewportX, backEnd.viewParms.viewportX + backEnd.viewParms.viewportWidth,
+ backEnd.viewParms.viewportY, backEnd.viewParms.viewportY + backEnd.viewParms.viewportHeight,
+ -99999, 99999 );
+
+ for ( f = r_activeFlares ; f ; f = f->next ) {
+ if ( f->frameSceneNum == backEnd.viewParms.frameSceneNum
+ && f->inPortal == backEnd.viewParms.isPortal
+ && f->drawIntensity ) {
+ RB_RenderFlare( f );
+ }
+ }
+
+ qglPopMatrix();
+ qglMatrixMode( GL_MODELVIEW );
+ qglPopMatrix();
+}
+
|