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tr_sky.c File Reference

#include "tr_local.h"

Include dependency graph for tr_sky.c:

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Defines

#define HALF_SKY_SUBDIVISIONS   (SKY_SUBDIVISIONS/2)
#define MAX_CLIP_VERTS   64
#define ON_EPSILON   0.1f
#define SKY_SUBDIVISIONS   8
#define SQR(a)   ((a)*(a))

Functions

void AddSkyPolygon (int nump, vec3_t vecs)
void ClearSkyBox (void)
void ClipSkyPolygon (int nump, vec3_t vecs, int stage)
void DrawSkyBox (shader_t *shader)
void DrawSkySide (struct image_s *image, const int mins[2], const int maxs[2])
void FillCloudBox (const shader_t *shader, int stage)
void FillCloudySkySide (const int mins[2], const int maxs[2], qboolean addIndexes)
void MakeSkyVec (float s, float t, int axis, float outSt[2], vec3_t outXYZ)
void R_BuildCloudData (shaderCommands_t *input)
void R_InitSkyTexCoords (float heightCloud)
void RB_ClipSkyPolygons (shaderCommands_t *input)
void RB_DrawSun (void)
void RB_StageIteratorSky (void)

Variables

float s_cloudTexCoords [6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2]
float s_cloudTexP [6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1]
vec3_t s_skyPoints [SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1]
float s_skyTexCoords [SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2]
vec3_t sky_clip [6]
float sky_max
float sky_maxs [2][6]
float sky_min
float sky_mins [2][6]
int sky_texorder [6] = {0,2,1,3,4,5}

Define Documentation

#define HALF_SKY_SUBDIVISIONS   (SKY_SUBDIVISIONS/2)
 

Definition at line 26 of file tr_sky.c.

Referenced by DrawSkyBox(), FillCloudBox(), and R_InitSkyTexCoords().

#define MAX_CLIP_VERTS   64
 

Definition at line 144 of file tr_sky.c.

Referenced by ClipSkyPolygon().

#define ON_EPSILON   0.1f
 

Definition at line 143 of file tr_sky.c.

#define SKY_SUBDIVISIONS   8
 

Definition at line 25 of file tr_sky.c.

#define SQR (  a   )     ((a)*(a))
 

Definition at line 637 of file tr_sky.c.

Referenced by R_InitSkyTexCoords().

Function Documentation

void AddSkyPolygon (  int  nump,
vec3_t  vecs
)  [static]
 

Definition at line 57 of file tr_sky.c.

References fabs(), i, j, s, sky_maxs, sky_mins, t, v, vec3_origin, vec3_t, vecs, VectorAdd, VectorCopy, and vp.

Referenced by ClipSkyPolygon().

00058 {
00059     int     i,j;
00060     vec3_t  v, av;
00061     float   s, t, dv;
00062     int     axis;
00063     float   *vp;
00064     // s = [0]/[2], t = [1]/[2]
00065     static int  vec_to_st[6][3] =
00066     {
00067         {-2,3,1},
00068         {2,3,-1},
00069 
00070         {1,3,2},
00071         {-1,3,-2},
00072 
00073         {-2,-1,3},
00074         {-2,1,-3}
00075 
00076     //  {-1,2,3},
00077     //  {1,2,-3}
00078     };
00079 
00080     // decide which face it maps to
00081     VectorCopy (vec3_origin, v);
00082     for (i=0, vp=vecs ; i<nump ; i++, vp+=3)
00083     {
00084         VectorAdd (vp, v, v);
00085     }
00086     av[0] = fabs(v[0]);
00087     av[1] = fabs(v[1]);
00088     av[2] = fabs(v[2]);
00089     if (av[0] > av[1] && av[0] > av[2])
00090     {
00091         if (v[0] < 0)
00092             axis = 1;
00093         else
00094             axis = 0;
00095     }
00096     else if (av[1] > av[2] && av[1] > av[0])
00097     {
00098         if (v[1] < 0)
00099             axis = 3;
00100         else
00101             axis = 2;
00102     }
00103     else
00104     {
00105         if (v[2] < 0)
00106             axis = 5;
00107         else
00108             axis = 4;
00109     }
00110 
00111     // project new texture coords
00112     for (i=0 ; i<nump ; i++, vecs+=3)
00113     {
00114         j = vec_to_st[axis][2];
00115         if (j > 0)
00116             dv = vecs[j - 1];
00117         else
00118             dv = -vecs[-j - 1];
00119         if (dv < 0.001)
00120             continue;   // don't divide by zero
00121         j = vec_to_st[axis][0];
00122         if (j < 0)
00123             s = -vecs[-j -1] / dv;
00124         else
00125             s = vecs[j-1] / dv;
00126         j = vec_to_st[axis][1];
00127         if (j < 0)
00128             t = -vecs[-j -1] / dv;
00129         else
00130             t = vecs[j-1] / dv;
00131 
00132         if (s < sky_mins[0][axis])
00133             sky_mins[0][axis] = s;
00134         if (t < sky_mins[1][axis])
00135             sky_mins[1][axis] = t;
00136         if (s > sky_maxs[0][axis])
00137             sky_maxs[0][axis] = s;
00138         if (t > sky_maxs[1][axis])
00139             sky_maxs[1][axis] = t;
00140     }
00141 }

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void ClearSkyBox (  void   )  [static]
 

Definition at line 246 of file tr_sky.c.

References i, sky_maxs, and sky_mins.

Referenced by RB_ClipSkyPolygons().

00246                                {
00247     int     i;
00248 
00249     for (i=0 ; i<6 ; i++) {
00250         sky_mins[0][i] = sky_mins[1][i] = 9999;
00251         sky_maxs[0][i] = sky_maxs[1][i] = -9999;
00252     }
00253 }

void ClipSkyPolygon (  int  nump,
vec3_t  vecs,
int  stage
)  [static]
 

Definition at line 150 of file tr_sky.c.

References AddSkyPolygon(), d, DotProduct, e, ERR_DROP, i, j, MAX_CLIP_VERTS, qboolean, ri, SIDE_BACK, SIDE_FRONT, SIDE_ON, sky_clip, v, vec3_t, vecs, and VectorCopy.

Referenced by RB_ClipSkyPolygons().

00151 {
00152     float   *norm;
00153     float   *v;
00154     qboolean    front, back;
00155     float   d, e;
00156     float   dists[MAX_CLIP_VERTS];
00157     int     sides[MAX_CLIP_VERTS];
00158     vec3_t  newv[2][MAX_CLIP_VERTS];
00159     int     newc[2];
00160     int     i, j;
00161 
00162     if (nump > MAX_CLIP_VERTS-2)
00163         ri.Error (ERR_DROP, "ClipSkyPolygon: MAX_CLIP_VERTS");
00164     if (stage == 6)
00165     {   // fully clipped, so draw it
00166         AddSkyPolygon (nump, vecs);
00167         return;
00168     }
00169 
00170     front = back = qfalse;
00171     norm = sky_clip[stage];
00172     for (i=0, v = vecs ; i<nump ; i++, v+=3)
00173     {
00174         d = DotProduct (v, norm);
00175         if (d > ON_EPSILON)
00176         {
00177             front = qtrue;
00178             sides[i] = SIDE_FRONT;
00179         }
00180         else if (d < -ON_EPSILON)
00181         {
00182             back = qtrue;
00183             sides[i] = SIDE_BACK;
00184         }
00185         else
00186             sides[i] = SIDE_ON;
00187         dists[i] = d;
00188     }
00189 
00190     if (!front || !back)
00191     {   // not clipped
00192         ClipSkyPolygon (nump, vecs, stage+1);
00193         return;
00194     }
00195 
00196     // clip it
00197     sides[i] = sides[0];
00198     dists[i] = dists[0];
00199     VectorCopy (vecs, (vecs+(i*3)) );
00200     newc[0] = newc[1] = 0;
00201 
00202     for (i=0, v = vecs ; i<nump ; i++, v+=3)
00203     {
00204         switch (sides[i])
00205         {
00206         case SIDE_FRONT:
00207             VectorCopy (v, newv[0][newc[0]]);
00208             newc[0]++;
00209             break;
00210         case SIDE_BACK:
00211             VectorCopy (v, newv[1][newc[1]]);
00212             newc[1]++;
00213             break;
00214         case SIDE_ON:
00215             VectorCopy (v, newv[0][newc[0]]);
00216             newc[0]++;
00217             VectorCopy (v, newv[1][newc[1]]);
00218             newc[1]++;
00219             break;
00220         }
00221 
00222         if (sides[i] == SIDE_ON || sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
00223             continue;
00224 
00225         d = dists[i] / (dists[i] - dists[i+1]);
00226         for (j=0 ; j<3 ; j++)
00227         {
00228             e = v[j] + d*(v[j+3] - v[j]);
00229             newv[0][newc[0]][j] = e;
00230             newv[1][newc[1]][j] = e;
00231         }
00232         newc[0]++;
00233         newc[1]++;
00234     }
00235 
00236     // continue
00237     ClipSkyPolygon (newc[0], newv[0][0], stage+1);
00238     ClipSkyPolygon (newc[1], newv[1][0], stage+1);
00239 }

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void DrawSkyBox (  shader_t *  shader  )  [static]
 

Definition at line 387 of file tr_sky.c.

References ceil(), Com_Memset(), DrawSkySide(), floor(), HALF_SKY_SUBDIVISIONS, i, MakeSkyVec(), skyParms_t::outerbox, s, s_skyPoints, s_skyTexCoords, shader_t, shader_s::sky, sky_max, sky_maxs, sky_min, sky_mins, sky_texorder, and t.

Referenced by RB_StageIteratorSky().

00388 {
00389     int     i;
00390 
00391     sky_min = 0;
00392     sky_max = 1;
00393 
00394     Com_Memset( s_skyTexCoords, 0, sizeof( s_skyTexCoords ) );
00395 
00396     for (i=0 ; i<6 ; i++)
00397     {
00398         int sky_mins_subd[2], sky_maxs_subd[2];
00399         int s, t;
00400 
00401         sky_mins[0][i] = floor( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00402         sky_mins[1][i] = floor( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00403         sky_maxs[0][i] = ceil( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00404         sky_maxs[1][i] = ceil( sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00405 
00406         if ( ( sky_mins[0][i] >= sky_maxs[0][i] ) ||
00407              ( sky_mins[1][i] >= sky_maxs[1][i] ) )
00408         {
00409             continue;
00410         }
00411 
00412         sky_mins_subd[0] = sky_mins[0][i] * HALF_SKY_SUBDIVISIONS;
00413         sky_mins_subd[1] = sky_mins[1][i] * HALF_SKY_SUBDIVISIONS;
00414         sky_maxs_subd[0] = sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS;
00415         sky_maxs_subd[1] = sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS;
00416 
00417         if ( sky_mins_subd[0] < -HALF_SKY_SUBDIVISIONS ) 
00418             sky_mins_subd[0] = -HALF_SKY_SUBDIVISIONS;
00419         else if ( sky_mins_subd[0] > HALF_SKY_SUBDIVISIONS ) 
00420             sky_mins_subd[0] = HALF_SKY_SUBDIVISIONS;
00421         if ( sky_mins_subd[1] < -HALF_SKY_SUBDIVISIONS )
00422             sky_mins_subd[1] = -HALF_SKY_SUBDIVISIONS;
00423         else if ( sky_mins_subd[1] > HALF_SKY_SUBDIVISIONS ) 
00424             sky_mins_subd[1] = HALF_SKY_SUBDIVISIONS;
00425 
00426         if ( sky_maxs_subd[0] < -HALF_SKY_SUBDIVISIONS ) 
00427             sky_maxs_subd[0] = -HALF_SKY_SUBDIVISIONS;
00428         else if ( sky_maxs_subd[0] > HALF_SKY_SUBDIVISIONS ) 
00429             sky_maxs_subd[0] = HALF_SKY_SUBDIVISIONS;
00430         if ( sky_maxs_subd[1] < -HALF_SKY_SUBDIVISIONS ) 
00431             sky_maxs_subd[1] = -HALF_SKY_SUBDIVISIONS;
00432         else if ( sky_maxs_subd[1] > HALF_SKY_SUBDIVISIONS ) 
00433             sky_maxs_subd[1] = HALF_SKY_SUBDIVISIONS;
00434 
00435         //
00436         // iterate through the subdivisions
00437         //
00438         for ( t = sky_mins_subd[1]+HALF_SKY_SUBDIVISIONS; t <= sky_maxs_subd[1]+HALF_SKY_SUBDIVISIONS; t++ )
00439         {
00440             for ( s = sky_mins_subd[0]+HALF_SKY_SUBDIVISIONS; s <= sky_maxs_subd[0]+HALF_SKY_SUBDIVISIONS; s++ )
00441             {
00442                 MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00443                             ( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00444                             i, 
00445                             s_skyTexCoords[t][s], 
00446                             s_skyPoints[t][s] );
00447             }
00448         }
00449 
00450         DrawSkySide( shader->sky.outerbox[sky_texorder[i]],
00451                      sky_mins_subd,
00452                      sky_maxs_subd );
00453     }
00454 
00455 }

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void DrawSkySide (  struct image_s *  image,
const int  mins[2],
const int  maxs[2]
)  [static]
 

Definition at line 364 of file tr_sky.c.

References GL_Bind(), qglBegin, qglEnd, qglTexCoord2fv, qglVertex3fv, s, s_skyPoints, s_skyTexCoords, and t.

Referenced by DrawSkyBox().

00365 {
00366     int s, t;
00367 
00368     GL_Bind( image );
00369 
00370     for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t < maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
00371     {
00372         qglBegin( GL_TRIANGLE_STRIP );
00373 
00374         for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
00375         {
00376             qglTexCoord2fv( s_skyTexCoords[t][s] );
00377             qglVertex3fv( s_skyPoints[t][s] );
00378 
00379             qglTexCoord2fv( s_skyTexCoords[t+1][s] );
00380             qglVertex3fv( s_skyPoints[t+1][s] );
00381         }
00382 
00383         qglEnd();
00384     }
00385 }

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void FillCloudBox (  const shader_t *  shader,
int  stage
)  [static]
 

Definition at line 507 of file tr_sky.c.

References ceil(), FillCloudySkySide(), floor(), HALF_SKY_SUBDIVISIONS, i, MakeSkyVec(), myftol, NULL, s, s_cloudTexCoords, s_skyPoints, s_skyTexCoords, shader_t, sky_maxs, sky_mins, and t.

Referenced by R_BuildCloudData().

00508 {
00509     int i;
00510 
00511     for ( i =0; i < 6; i++ )
00512     {
00513         int sky_mins_subd[2], sky_maxs_subd[2];
00514         int s, t;
00515         float MIN_T;
00516 
00517         if ( 1 ) // FIXME? shader->sky.fullClouds )
00518         {
00519             MIN_T = -HALF_SKY_SUBDIVISIONS;
00520 
00521             // still don't want to draw the bottom, even if fullClouds
00522             if ( i == 5 )
00523                 continue;
00524         }
00525         else
00526         {
00527             switch( i )
00528             {
00529             case 0:
00530             case 1:
00531             case 2:
00532             case 3:
00533                 MIN_T = -1;
00534                 break;
00535             case 5:
00536                 // don't draw clouds beneath you
00537                 continue;
00538             case 4:     // top
00539             default:
00540                 MIN_T = -HALF_SKY_SUBDIVISIONS;
00541                 break;
00542             }
00543         }
00544 
00545         sky_mins[0][i] = floor( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00546         sky_mins[1][i] = floor( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00547         sky_maxs[0][i] = ceil( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00548         sky_maxs[1][i] = ceil( sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS ) / HALF_SKY_SUBDIVISIONS;
00549 
00550         if ( ( sky_mins[0][i] >= sky_maxs[0][i] ) ||
00551              ( sky_mins[1][i] >= sky_maxs[1][i] ) )
00552         {
00553             continue;
00554         }
00555 
00556         sky_mins_subd[0] = myftol( sky_mins[0][i] * HALF_SKY_SUBDIVISIONS );
00557         sky_mins_subd[1] = myftol( sky_mins[1][i] * HALF_SKY_SUBDIVISIONS );
00558         sky_maxs_subd[0] = myftol( sky_maxs[0][i] * HALF_SKY_SUBDIVISIONS );
00559         sky_maxs_subd[1] = myftol( sky_maxs[1][i] * HALF_SKY_SUBDIVISIONS );
00560 
00561         if ( sky_mins_subd[0] < -HALF_SKY_SUBDIVISIONS ) 
00562             sky_mins_subd[0] = -HALF_SKY_SUBDIVISIONS;
00563         else if ( sky_mins_subd[0] > HALF_SKY_SUBDIVISIONS ) 
00564             sky_mins_subd[0] = HALF_SKY_SUBDIVISIONS;
00565         if ( sky_mins_subd[1] < MIN_T )
00566             sky_mins_subd[1] = MIN_T;
00567         else if ( sky_mins_subd[1] > HALF_SKY_SUBDIVISIONS ) 
00568             sky_mins_subd[1] = HALF_SKY_SUBDIVISIONS;
00569 
00570         if ( sky_maxs_subd[0] < -HALF_SKY_SUBDIVISIONS ) 
00571             sky_maxs_subd[0] = -HALF_SKY_SUBDIVISIONS;
00572         else if ( sky_maxs_subd[0] > HALF_SKY_SUBDIVISIONS ) 
00573             sky_maxs_subd[0] = HALF_SKY_SUBDIVISIONS;
00574         if ( sky_maxs_subd[1] < MIN_T )
00575             sky_maxs_subd[1] = MIN_T;
00576         else if ( sky_maxs_subd[1] > HALF_SKY_SUBDIVISIONS ) 
00577             sky_maxs_subd[1] = HALF_SKY_SUBDIVISIONS;
00578 
00579         //
00580         // iterate through the subdivisions
00581         //
00582         for ( t = sky_mins_subd[1]+HALF_SKY_SUBDIVISIONS; t <= sky_maxs_subd[1]+HALF_SKY_SUBDIVISIONS; t++ )
00583         {
00584             for ( s = sky_mins_subd[0]+HALF_SKY_SUBDIVISIONS; s <= sky_maxs_subd[0]+HALF_SKY_SUBDIVISIONS; s++ )
00585             {
00586                 MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00587                             ( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00588                             i, 
00589                             NULL,
00590                             s_skyPoints[t][s] );
00591 
00592                 s_skyTexCoords[t][s][0] = s_cloudTexCoords[i][t][s][0];
00593                 s_skyTexCoords[t][s][1] = s_cloudTexCoords[i][t][s][1];
00594             }
00595         }
00596 
00597         // only add indexes for first stage
00598         FillCloudySkySide( sky_mins_subd, sky_maxs_subd, ( stage == 0 ) );
00599     }
00600 }

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void FillCloudySkySide (  const int  mins[2],
const int  maxs[2],
qboolean  addIndexes
)  [static]
 

Definition at line 457 of file tr_sky.c.

References backEnd, ERR_DROP, shaderCommands_s::indexes, shaderCommands_s::numIndexes, shaderCommands_s::numVertexes, viewParms_t::or, orientationr_t::origin, ri, s, s_skyPoints, s_skyTexCoords, t, tess, shaderCommands_s::texCoords, VectorAdd, backEndState_t::viewParms, and shaderCommands_s::xyz.

Referenced by FillCloudBox().

00458 {
00459     int s, t;
00460     int vertexStart = tess.numVertexes;
00461     int tHeight, sWidth;
00462 
00463     tHeight = maxs[1] - mins[1] + 1;
00464     sWidth = maxs[0] - mins[0] + 1;
00465 
00466     for ( t = mins[1]+HALF_SKY_SUBDIVISIONS; t <= maxs[1]+HALF_SKY_SUBDIVISIONS; t++ )
00467     {
00468         for ( s = mins[0]+HALF_SKY_SUBDIVISIONS; s <= maxs[0]+HALF_SKY_SUBDIVISIONS; s++ )
00469         {
00470             VectorAdd( s_skyPoints[t][s], backEnd.viewParms.or.origin, tess.xyz[tess.numVertexes] );
00471             tess.texCoords[tess.numVertexes][0][0] = s_skyTexCoords[t][s][0];
00472             tess.texCoords[tess.numVertexes][0][1] = s_skyTexCoords[t][s][1];
00473 
00474             tess.numVertexes++;
00475 
00476             if ( tess.numVertexes >= SHADER_MAX_VERTEXES )
00477             {
00478                 ri.Error( ERR_DROP, "SHADER_MAX_VERTEXES hit in FillCloudySkySide()\n" );
00479             }
00480         }
00481     }
00482 
00483     // only add indexes for one pass, otherwise it would draw multiple times for each pass
00484     if ( addIndexes ) {
00485         for ( t = 0; t < tHeight-1; t++ )
00486         {   
00487             for ( s = 0; s < sWidth-1; s++ )
00488             {
00489                 tess.indexes[tess.numIndexes] = vertexStart + s + t * ( sWidth );
00490                 tess.numIndexes++;
00491                 tess.indexes[tess.numIndexes] = vertexStart + s + ( t + 1 ) * ( sWidth );
00492                 tess.numIndexes++;
00493                 tess.indexes[tess.numIndexes] = vertexStart + s + 1 + t * ( sWidth );
00494                 tess.numIndexes++;
00495 
00496                 tess.indexes[tess.numIndexes] = vertexStart + s + ( t + 1 ) * ( sWidth );
00497                 tess.numIndexes++;
00498                 tess.indexes[tess.numIndexes] = vertexStart + s + 1 + ( t + 1 ) * ( sWidth );
00499                 tess.numIndexes++;
00500                 tess.indexes[tess.numIndexes] = vertexStart + s + 1 + t * ( sWidth );
00501                 tess.numIndexes++;
00502             }
00503         }
00504     }
00505 }

void MakeSkyVec (  float  s,
float  t,
int  axis,
float  outSt[2],
vec3_t  outXYZ
)  [static]
 

Definition at line 292 of file tr_sky.c.

References b, backEnd, j, k, s, t, vec3_t, backEndState_t::viewParms, and viewParms_t::zFar.

Referenced by DrawSkyBox(), FillCloudBox(), and R_InitSkyTexCoords().

00293 {
00294     // 1 = s, 2 = t, 3 = 2048
00295     static int  st_to_vec[6][3] =
00296     {
00297         {3,-1,2},
00298         {-3,1,2},
00299 
00300         {1,3,2},
00301         {-1,-3,2},
00302 
00303         {-2,-1,3},      // 0 degrees yaw, look straight up
00304         {2,-1,-3}       // look straight down
00305     };
00306 
00307     vec3_t      b;
00308     int         j, k;
00309     float   boxSize;
00310 
00311     boxSize = backEnd.viewParms.zFar / 1.75;        // div sqrt(3)
00312     b[0] = s*boxSize;
00313     b[1] = t*boxSize;
00314     b[2] = boxSize;
00315 
00316     for (j=0 ; j<3 ; j++)
00317     {
00318         k = st_to_vec[axis][j];
00319         if (k < 0)
00320         {
00321             outXYZ[j] = -b[-k - 1];
00322         }
00323         else
00324         {
00325             outXYZ[j] = b[k - 1];
00326         }
00327     }
00328 
00329     // avoid bilerp seam
00330     s = (s+1)*0.5;
00331     t = (t+1)*0.5;
00332     if (s < sky_min)
00333     {
00334         s = sky_min;
00335     }
00336     else if (s > sky_max)
00337     {
00338         s = sky_max;
00339     }
00340 
00341     if (t < sky_min)
00342     {
00343         t = sky_min;
00344     }
00345     else if (t > sky_max)
00346     {
00347         t = sky_max;
00348     }
00349 
00350     t = 1.0 - t;
00351 
00352 
00353     if ( outSt )
00354     {
00355         outSt[0] = s;
00356         outSt[1] = t;
00357     }
00358 }

void R_BuildCloudData (  shaderCommands_t *  input  ) 
 

Definition at line 605 of file tr_sky.c.

References assert, skyParms_t::cloudHeight, FillCloudBox(), i, input, shader_s::isSky, shaderCommands_s::numIndexes, shaderCommands_s::numVertexes, shaderCommands_s::shader, shader_t, shaderCommands_t, shader_s::sky, sky_max, sky_min, tess, and shaderCommands_s::xstages.

Referenced by RB_StageIteratorSky().

00606 {
00607     int         i;
00608     shader_t    *shader;
00609 
00610     shader = input->shader;
00611 
00612     assert( shader->isSky );
00613 
00614     sky_min = 1.0 / 256.0f;     // FIXME: not correct?
00615     sky_max = 255.0 / 256.0f;
00616 
00617     // set up for drawing
00618     tess.numIndexes = 0;
00619     tess.numVertexes = 0;
00620 
00621     if ( input->shader->sky.cloudHeight )
00622     {
00623         for ( i = 0; i < MAX_SHADER_STAGES; i++ )
00624         {
00625             if ( !tess.xstages[i] ) {
00626                 break;
00627             }
00628             FillCloudBox( input->shader, i );
00629         }
00630     }
00631 }

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void R_InitSkyTexCoords (  float  heightCloud  ) 
 

Definition at line 638 of file tr_sky.c.

References backEnd, DotProduct, HALF_SKY_SUBDIVISIONS, i, MakeSkyVec(), NULL, p, Q_acos(), s, s_cloudTexCoords, s_cloudTexP, SQR, sqrt(), t, v, vec3_t, VectorNormalize(), VectorScale, backEndState_t::viewParms, and viewParms_t::zFar.

Referenced by ParseSkyParms().

00639 {
00640     int i, s, t;
00641     float radiusWorld = 4096;
00642     float p;
00643     float sRad, tRad;
00644     vec3_t skyVec;
00645     vec3_t v;
00646 
00647     // init zfar so MakeSkyVec works even though
00648     // a world hasn't been bounded
00649     backEnd.viewParms.zFar = 1024;
00650 
00651     for ( i = 0; i < 6; i++ )
00652     {
00653         for ( t = 0; t <= SKY_SUBDIVISIONS; t++ )
00654         {
00655             for ( s = 0; s <= SKY_SUBDIVISIONS; s++ )
00656             {
00657                 // compute vector from view origin to sky side integral point
00658                 MakeSkyVec( ( s - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00659                             ( t - HALF_SKY_SUBDIVISIONS ) / ( float ) HALF_SKY_SUBDIVISIONS, 
00660                             i, 
00661                             NULL,
00662                             skyVec );
00663 
00664                 // compute parametric value 'p' that intersects with cloud layer
00665                 p = ( 1.0f / ( 2 * DotProduct( skyVec, skyVec ) ) ) *
00666                     ( -2 * skyVec[2] * radiusWorld + 
00667                        2 * sqrt( SQR( skyVec[2] ) * SQR( radiusWorld ) + 
00668                                  2 * SQR( skyVec[0] ) * radiusWorld * heightCloud +
00669                                  SQR( skyVec[0] ) * SQR( heightCloud ) + 
00670                                  2 * SQR( skyVec[1] ) * radiusWorld * heightCloud +
00671                                  SQR( skyVec[1] ) * SQR( heightCloud ) + 
00672                                  2 * SQR( skyVec[2] ) * radiusWorld * heightCloud +
00673                                  SQR( skyVec[2] ) * SQR( heightCloud ) ) );
00674 
00675                 s_cloudTexP[i][t][s] = p;
00676 
00677                 // compute intersection point based on p
00678                 VectorScale( skyVec, p, v );
00679                 v[2] += radiusWorld;
00680 
00681                 // compute vector from world origin to intersection point 'v'
00682                 VectorNormalize( v );
00683 
00684                 sRad = Q_acos( v[0] );
00685                 tRad = Q_acos( v[1] );
00686 
00687                 s_cloudTexCoords[i][t][s][0] = sRad;
00688                 s_cloudTexCoords[i][t][s][1] = tRad;
00689             }
00690         }
00691     }
00692 }

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void RB_ClipSkyPolygons (  shaderCommands_t *  input  ) 
 

Definition at line 260 of file tr_sky.c.

References backEnd, ClearSkyBox(), ClipSkyPolygon(), i, shaderCommands_s::indexes, input, j, shaderCommands_s::numIndexes, viewParms_t::or, orientationr_t::origin, p, shaderCommands_t, vec3_t, VectorSubtract, backEndState_t::viewParms, and shaderCommands_s::xyz.

Referenced by RB_StageIteratorSky().

00261 {
00262     vec3_t      p[5];   // need one extra point for clipping
00263     int         i, j;
00264 
00265     ClearSkyBox();
00266 
00267     for ( i = 0; i < input->numIndexes; i += 3 )
00268     {
00269         for (j = 0 ; j < 3 ; j++) 
00270         {
00271             VectorSubtract( input->xyz[input->indexes[i+j]],
00272                             backEnd.viewParms.or.origin, 
00273                             p[j] );
00274         }
00275         ClipSkyPolygon( 3, p[0], 0 );
00276     }
00277 }

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void RB_DrawSun (  void   ) 
 

Definition at line 699 of file tr_sky.c.

References backEnd, CrossProduct(), shaderCommands_s::fogNum, shaderCommands_s::indexes, cvar_s::integer, orientationr_t::modelMatrix, shaderCommands_s::numIndexes, shaderCommands_s::numVertexes, viewParms_t::or, orientationr_t::origin, PerpendicularVector(), qglDepthRange, qglLoadMatrixf, qglTranslatef, r_drawSun, RB_BeginSurface(), RB_EndSurface(), backEndState_t::skyRenderedThisView, trGlobals_t::sunDirection, trGlobals_t::sunShader, tess, shaderCommands_s::texCoords, tr, vec3_t, VectorAdd, VectorCopy, VectorScale, VectorSubtract, shaderCommands_s::vertexColors, backEndState_t::viewParms, viewParms_t::world, shaderCommands_s::xyz, and viewParms_t::zFar.

Referenced by RB_RenderDrawSurfList().

00699                         {
00700     float       size;
00701     float       dist;
00702     vec3_t      origin, vec1, vec2;
00703     vec3_t      temp;
00704 
00705     if ( !backEnd.skyRenderedThisView ) {
00706         return;
00707     }
00708     if ( !r_drawSun->integer ) {
00709         return;
00710     }
00711     qglLoadMatrixf( backEnd.viewParms.world.modelMatrix );
00712     qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2]);
00713 
00714     dist =  backEnd.viewParms.zFar / 1.75;      // div sqrt(3)
00715     size = dist * 0.4;
00716 
00717     VectorScale( tr.sunDirection, dist, origin );
00718     PerpendicularVector( vec1, tr.sunDirection );
00719     CrossProduct( tr.sunDirection, vec1, vec2 );
00720 
00721     VectorScale( vec1, size, vec1 );
00722     VectorScale( vec2, size, vec2 );
00723 
00724     // farthest depth range
00725     qglDepthRange( 1.0, 1.0 );
00726 
00727     // FIXME: use quad stamp
00728     RB_BeginSurface( tr.sunShader, tess.fogNum );
00729         VectorCopy( origin, temp );
00730         VectorSubtract( temp, vec1, temp );
00731         VectorSubtract( temp, vec2, temp );
00732         VectorCopy( temp, tess.xyz[tess.numVertexes] );
00733         tess.texCoords[tess.numVertexes][0][0] = 0;
00734         tess.texCoords[tess.numVertexes][0][1] = 0;
00735         tess.vertexColors[tess.numVertexes][0] = 255;
00736         tess.vertexColors[tess.numVertexes][1] = 255;
00737         tess.vertexColors[tess.numVertexes][2] = 255;
00738         tess.numVertexes++;
00739 
00740         VectorCopy( origin, temp );
00741         VectorAdd( temp, vec1, temp );
00742         VectorSubtract( temp, vec2, temp );
00743         VectorCopy( temp, tess.xyz[tess.numVertexes] );
00744         tess.texCoords[tess.numVertexes][0][0] = 0;
00745         tess.texCoords[tess.numVertexes][0][1] = 1;
00746         tess.vertexColors[tess.numVertexes][0] = 255;
00747         tess.vertexColors[tess.numVertexes][1] = 255;
00748         tess.vertexColors[tess.numVertexes][2] = 255;
00749         tess.numVertexes++;
00750 
00751         VectorCopy( origin, temp );
00752         VectorAdd( temp, vec1, temp );
00753         VectorAdd( temp, vec2, temp );
00754         VectorCopy( temp, tess.xyz[tess.numVertexes] );
00755         tess.texCoords[tess.numVertexes][0][0] = 1;
00756         tess.texCoords[tess.numVertexes][0][1] = 1;
00757         tess.vertexColors[tess.numVertexes][0] = 255;
00758         tess.vertexColors[tess.numVertexes][1] = 255;
00759         tess.vertexColors[tess.numVertexes][2] = 255;
00760         tess.numVertexes++;
00761 
00762         VectorCopy( origin, temp );
00763         VectorSubtract( temp, vec1, temp );
00764         VectorAdd( temp, vec2, temp );
00765         VectorCopy( temp, tess.xyz[tess.numVertexes] );
00766         tess.texCoords[tess.numVertexes][0][0] = 1;
00767         tess.texCoords[tess.numVertexes][0][1] = 0;
00768         tess.vertexColors[tess.numVertexes][0] = 255;
00769         tess.vertexColors[tess.numVertexes][1] = 255;
00770         tess.vertexColors[tess.numVertexes][2] = 255;
00771         tess.numVertexes++;
00772 
00773         tess.indexes[tess.numIndexes++] = 0;
00774         tess.indexes[tess.numIndexes++] = 1;
00775         tess.indexes[tess.numIndexes++] = 2;
00776         tess.indexes[tess.numIndexes++] = 0;
00777         tess.indexes[tess.numIndexes++] = 2;
00778         tess.indexes[tess.numIndexes++] = 3;
00779 
00780     RB_EndSurface();
00781 
00782     // back to normal depth range
00783     qglDepthRange( 0.0, 1.0 );
00784 }

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void RB_StageIteratorSky (  void   ) 
 

Definition at line 798 of file tr_sky.c.

References backEnd, trGlobals_t::defaultImage, DrawSkyBox(), GL_State(), trGlobals_t::identityLight, cvar_s::integer, viewParms_t::or, orientationr_t::origin, skyParms_t::outerbox, qglColor3f, qglDepthRange, qglPopMatrix, qglPushMatrix, qglTranslatef, R_BuildCloudData(), r_fastsky, r_showsky, RB_ClipSkyPolygons(), RB_StageIteratorGeneric(), shaderCommands_s::shader, shader_s::sky, backEndState_t::skyRenderedThisView, tess, tr, and backEndState_t::viewParms.

00798                                  {
00799     if ( r_fastsky->integer ) {
00800         return;
00801     }
00802 
00803     // go through all the polygons and project them onto
00804     // the sky box to see which blocks on each side need
00805     // to be drawn
00806     RB_ClipSkyPolygons( &tess );
00807 
00808     // r_showsky will let all the sky blocks be drawn in
00809     // front of everything to allow developers to see how
00810     // much sky is getting sucked in
00811     if ( r_showsky->integer ) {
00812         qglDepthRange( 0.0, 0.0 );
00813     } else {
00814         qglDepthRange( 1.0, 1.0 );
00815     }
00816 
00817     // draw the outer skybox
00818     if ( tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage ) {
00819         qglColor3f( tr.identityLight, tr.identityLight, tr.identityLight );
00820         
00821         qglPushMatrix ();
00822         GL_State( 0 );
00823         qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2]);
00824 
00825         DrawSkyBox( tess.shader );
00826 
00827         qglPopMatrix();
00828     }
00829 
00830     // generate the vertexes for all the clouds, which will be drawn
00831     // by the generic shader routine
00832     R_BuildCloudData( &tess );
00833 
00834     RB_StageIteratorGeneric();
00835 
00836     // draw the inner skybox
00837 
00838 
00839     // back to normal depth range
00840     qglDepthRange( 0.0, 1.0 );
00841 
00842     // note that sky was drawn so we will draw a sun later
00843     backEnd.skyRenderedThisView = qtrue;
00844 }

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Variable Documentation

float s_cloudTexCoords[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2] [static]
 

Definition at line 28 of file tr_sky.c.

Referenced by FillCloudBox(), and R_InitSkyTexCoords().

float s_cloudTexP[6][SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1] [static]
 

Definition at line 29 of file tr_sky.c.

Referenced by R_InitSkyTexCoords().

vec3_t s_skyPoints[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1] [static]
 

Definition at line 361 of file tr_sky.c.

Referenced by DrawSkyBox(), DrawSkySide(), FillCloudBox(), and FillCloudySkySide().

float s_skyTexCoords[SKY_SUBDIVISIONS+1][SKY_SUBDIVISIONS+1][2] [static]
 

Definition at line 362 of file tr_sky.c.

Referenced by DrawSkyBox(), DrawSkySide(), FillCloudBox(), and FillCloudySkySide().

vec3_t sky_clip[6] [static]
 

Initial value:

 
{
    {1,1,0},
    {1,-1,0},
    {0,-1,1},
    {0,1,1},
    {1,0,1},
    {-1,0,1} 
}

Definition at line 39 of file tr_sky.c.

Referenced by ClipSkyPolygon().

float sky_max [static]
 

Definition at line 50 of file tr_sky.c.

Referenced by DrawSkyBox(), and R_BuildCloudData().

float sky_maxs[2][6] [static]
 

Definition at line 49 of file tr_sky.c.

Referenced by AddSkyPolygon(), ClearSkyBox(), DrawSkyBox(), and FillCloudBox().

float sky_min [static]
 

Definition at line 50 of file tr_sky.c.

Referenced by DrawSkyBox(), and R_BuildCloudData().

float sky_mins[2][6] [static]
 

Definition at line 49 of file tr_sky.c.

Referenced by AddSkyPolygon(), ClearSkyBox(), DrawSkyBox(), and FillCloudBox().

int sky_texorder[6] = {0,2,1,3,4,5} [static]
 

Definition at line 360 of file tr_sky.c.

Referenced by DrawSkyBox().

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