138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
//tracks.cpp
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//draw tire tracks on the road
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#include <OpenGL/gl.h>
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#include "textures.h"
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#include "fileio.h"
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#include "vectors.h"
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#include "renderframe.h"
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#include "gamemem.h"
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#include "network.h"
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#include "tracks.h"
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#include "log.h"
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#include "error.h"
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#include "gameinitexit.h"
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#include "environment.h"
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#define kMaxTrack 512 //size of track segment buffer
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#define kTrackShiftSize 256 //how many track segmnents to delete when buffer is full
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#define kTrackHeight 0.02 //how far tracks are drawn above ground (to avoid z-buffer problems)
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#define kMaxIntensity 0.8
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#define kTrackTexScale 0.18
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typedef struct{
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tVector3 pos1l,pos1r,pos2l,pos2r,normal;
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int texture;
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float l1,l2;
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float intensity1,intensity2;
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} tTrackSegment;
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tTrackSegment gTrack[kMaxTrack];//track segment buffer
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int gNumTracks=0;
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int gTrackIndexShift=0;
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//Add a new segment of tire tracks, going from pos1 to pos2
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//attach specifies a track segment which links to this one
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int TracksAdd(tVector3 pos1,tVector3 pos2,tVector3 normal,float width,int texture,float intensity,int attach)
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{
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//is there any space left in the track segment buffer?
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if(gNumTracks>=kMaxTrack)
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{
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//if not, delete kTrackShiftSize elements, by shifting the track segment buffer
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gTrackIndexShift+=kTrackShiftSize;
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gNumTracks-=kTrackShiftSize;
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MemoryMove(gTrack,gTrack+kTrackShiftSize,(kMaxTrack-kTrackShiftSize)*sizeof(tTrackSegment));
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}
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float adjustedIntensity=intensity*kMaxIntensity;
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pos1.y+=kTrackHeight;//to avoid Z-Buffer Problems
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pos2.y+=kTrackHeight;
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tVector3 crossNormal=!((pos1-pos2)%normal);
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gTrack[gNumTracks].pos1l=pos1+crossNormal*width*0.5;
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gTrack[gNumTracks].pos1r=pos1-crossNormal*width*0.5;
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gTrack[gNumTracks].pos2l=pos2+crossNormal*width*0.5;
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gTrack[gNumTracks].pos2r=pos2-crossNormal*width*0.5;
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gTrack[gNumTracks].normal=normal;
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gTrack[gNumTracks].texture=texture;
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gTrack[gNumTracks].intensity1=adjustedIntensity;
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gTrack[gNumTracks].intensity2=adjustedIntensity;
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gTrack[gNumTracks].l1=0;
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gTrack[gNumTracks].l2=~(pos2-pos1);
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//does attach correspods to a given Track Segment in the Buffer?
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if(attach-gTrackIndexShift>0)
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{
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//fix the Track Segments to properly fit together.
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gTrack[attach-gTrackIndexShift].pos2l=gTrack[gNumTracks].pos1l;
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gTrack[attach-gTrackIndexShift].pos2r=gTrack[gNumTracks].pos1r;
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gTrack[attach-gTrackIndexShift].l2=gTrack[attach-gTrackIndexShift].l1+~(gTrack[attach-gTrackIndexShift].pos2l-gTrack[attach-gTrackIndexShift].pos1l);
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gTrack[attach-gTrackIndexShift].intensity2=adjustedIntensity;
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float lOffs=gTrack[attach-gTrackIndexShift].l2;
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gTrack[gNumTracks].l1+=lOffs;
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gTrack[gNumTracks].l2+=lOffs;
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}
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return (gNumTracks++)+gTrackIndexShift;
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}
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//clear the Track Segment Buffer
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void TracksClear()
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{
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gNumTracks=0;
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}
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//Render the Tracks
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void TracksRender(tVector3 *clipPlanes)
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{
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SetupWorldTranslation();
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glPushAttrib(GL_COLOR_BUFFER_BIT+GL_CURRENT_BIT+GL_DEPTH_BUFFER_BIT+GL_LIGHTING_BIT);
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glDisable(GL_LIGHTING);
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glEnable(GL_BLEND);
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glDepthMask(false);
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glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
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int tex=-1;
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for(int i=0;i<gNumTracks;i++)
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//is the segment visible?
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if(!ClipPointDistanced(clipPlanes,&gTrack[i].pos1r,gTrack[i].l2-gTrack[i].l1))
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{
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if(gTrack[i].texture!=tex)
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{
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tex=gTrack[i].texture;
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int texLoaded=gFileTable[tex].parsed;
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TexturesSelectTex(tex);
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//if the texture has just been loaded, fade the alpha values of the mipmap level textures
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//this way we avoid moire effects for tire tracks further in the background.
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if(!texLoaded)
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TexturesAlphaFadeMipMaps();
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}
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//draw track segment.
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//glNormal3fv(&(gTrack[i].normal).x);
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float light=(gEnvironment->ambient.x+gEnvironment->ambient.y+gEnvironment->ambient.z)*0.33;
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glBegin(GL_TRIANGLE_STRIP);
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glTexCoord2d(0,gTrack[i].l1*kTrackTexScale);
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glColor4f(light,light,light,gTrack[i].intensity1);
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glVertex3fv(&(gTrack[i].pos1r).x);
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glTexCoord2d(0,gTrack[i].l2*kTrackTexScale);
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glColor4f(light,light,light,gTrack[i].intensity2);
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glVertex3fv(&(gTrack[i].pos2r).x);
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glTexCoord2d(1,gTrack[i].l1*kTrackTexScale);
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glColor4f(light,light,light,gTrack[i].intensity1);
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glVertex3fv(&(gTrack[i].pos1l).x);
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glTexCoord2d(1,gTrack[i].l2*kTrackTexScale);
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glColor4f(light,light,light,gTrack[i].intensity2);
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glVertex3fv(&(gTrack[i].pos2l).x);
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glEnd();
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#ifdef __POLYCOUNT
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gPolyCount+=2;
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#endif
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}
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glPopAttrib();
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} |