r_sprites.c

   1
   2 #include "quakedef.h"
   3 #include "r_shadow.h"
   4
   5 extern cvar_t r_labelsprites_scale;
   6 extern cvar_t r_labelsprites_roundtopixels;
   7 extern cvar_t r_track_sprites;
   8 extern cvar_t r_track_sprites_flags;
   9 extern cvar_t r_track_sprites_scalew;
  10 extern cvar_t r_track_sprites_scaleh;
  11
  12 #define TSF_ROTATE 1
  13 #define TSF_ROTATE_CONTINOUSLY 2
  14
  15 // use same epsilon as in sv_phys.c, it's not in any header, that's why i redefine it
  16 // MIN_EPSILON is for accurateness' sake :)
  17 #ifndef EPSILON
  18 # define EPSILON (1.0f / 32.0f)
  19 # define MIN_EPSILON 0.0001f
  20 #endif
  21
  22 /* R_Track_Sprite
  23    If the sprite is out of view, track it.
  24    `origin`, `left` and `up` are changed by this function to achive a rotation around
  25    the hotspot.
  26
  27    --blub
  28  */
  29 #define SIDE_TOP 1
  30 #define SIDE_LEFT 2
  31 #define SIDE_BOTTOM 3
  32 #define SIDE_RIGHT 4
  33
  34 void R_TrackSprite(const entity_render_t *ent, vec3_t origin, vec3_t left, vec3_t up, int *edge, float *dir_angle)
  35 {
  36         float distance;
  37         vec3_t bCoord; // body coordinates of object
  38         unsigned int i;
  39
  40         // temporarily abuse bCoord as the vector player->sprite-origin
  41         VectorSubtract(origin, r_refdef.view.origin, bCoord);
  42         distance = VectorLength(bCoord);
  43
  44         // Now get the bCoords :)
  45         Matrix4x4_Transform(&r_refdef.view.inverse_matrix, origin, bCoord);
  46
  47         *edge = 0; // FIXME::should assume edge == 0, which is correct currently
  48         for(i = 0; i < 4; ++i)
  49         {
  50                 if(PlaneDiff(origin, &r_refdef.view.frustum[i]) < -EPSILON)
  51                         break;
  52         }
  53
  54         // If it wasn't outside a plane, no tracking needed
  55         if(i < 4)
  56         {
  57                 float x, y;    // screen X and Y coordinates
  58                 float ax, ay;  // absolute coords, used for division
  59                 // I divide x and y by the greater absolute value to get ranges -1.0 to +1.0
  60
  61                 bCoord[2] *= r_refdef.view.frustum_x;
  62                 bCoord[1] *= r_refdef.view.frustum_y;
  63
  64                 //Con_Printf("%f %f %f\n", bCoord[0], bCoord[1], bCoord[2]);
  65
  66                 ax = fabs(bCoord[1]);
  67                 ay = fabs(bCoord[2]);
  68                 // get the greater value and determine the screen edge it's on
  69                 if(ax < ay)
  70                 {
  71                         ax = ay;
  72                         // 180 or 0 degrees
  73                         if(bCoord[2] < 0.0f)
  74                                 *edge = SIDE_BOTTOM;
  75                         else
  76                                 *edge = SIDE_TOP;
  77                 } else {
  78                         if(bCoord[1] < 0.0f)
  79                                 *edge = SIDE_RIGHT;
  80                         else
  81                                 *edge = SIDE_LEFT;
  82                 }
  83
  84                 // umm...
  85                 if(ax < MIN_EPSILON) // this was == 0.0f before --blub
  86                         ax = MIN_EPSILON;
  87                 // get the -1 to +1 range
  88                 x = bCoord[1] / ax;
  89                 y = bCoord[2] / ax;
  90
  91                 ax = (1.0f / VectorLength(left));
  92                 ay = (1.0f / VectorLength(up));
  93                 // Using the placement below the distance of a sprite is
  94                 // real dist = sqrt(d*d + dfxa*dfxa + dgyb*dgyb)
  95                 // d is the distance we use
  96                 // f is frustum X
  97                 // x is x
  98                 // a is ax
  99                 // g is frustum Y
 100                 // y is y
 101                 // b is ay
 102
 103                 // real dist (r) shall be d, so
 104                 // r*r = d*d + dfxa*dfxa + dgyb*dgyb
 105                 // r*r = d*d * (1 + fxa*fxa + gyb*gyb)
 106                 // d*d = r*r / (1 + fxa*fxa + gyb*gyb)
 107                 // d = sqrt(r*r / (1 + fxa*fxa + gyb*gyb))
 108                 // thus:
 109                 distance = sqrt((distance*distance) / (1.0 +
 110                                         r_refdef.view.frustum_x*r_refdef.view.frustum_x * x*x * ax*ax +
 111                                         r_refdef.view.frustum_y*r_refdef.view.frustum_y * y*y * ay*ay));
 112                 // ^ the one we want        ^ the one we have       ^ our factors
 113
 114                 // Place the sprite a few units ahead of the player
 115                 VectorCopy(r_refdef.view.origin, origin);
 116                 VectorMA(origin, distance, r_refdef.view.forward, origin);
 117                 // Move the sprite left / up the screeen height
 118                 VectorMA(origin, distance * r_refdef.view.frustum_x * x * ax, left, origin);
 119                 VectorMA(origin, distance * r_refdef.view.frustum_y * y * ay, up, origin);
 120
 121                 if(r_track_sprites_flags.integer & TSF_ROTATE_CONTINOUSLY)
 122                 {
 123                         // compute the rotation, negate y axis, we're pointing outwards
 124                         *dir_angle = atan(-y / x) * 180.0f/M_PI;
 125                         // we need the real, full angle
 126                         if(x < 0.0f)
 127                                 *dir_angle += 180.0f;
 128                 }
 129
 130                 left[0] *= r_track_sprites_scalew.value;
 131                 left[1] *= r_track_sprites_scalew.value;
 132                 left[2] *= r_track_sprites_scalew.value;
 133
 134                 up[0] *= r_track_sprites_scaleh.value;
 135                 up[1] *= r_track_sprites_scaleh.value;
 136                 up[2] *= r_track_sprites_scaleh.value;
 137         }
 138 }
 139
 140 void R_RotateSprite(const mspriteframe_t *frame, vec3_t origin, vec3_t left, vec3_t up, int edge, float dir_angle)
 141 {
 142         if(!(r_track_sprites_flags.integer & TSF_ROTATE))
 143         {
 144                 // move down by its size if on top, otherwise it's invisible
 145                 if(edge == SIDE_TOP)
 146                         VectorMA(origin, -(fabs(frame->up)+fabs(frame->down)), up, origin);
 147         } else {
 148                 static float rotation_angles[5] =
 149                 {
 150                         0, // no edge
 151                         -90.0f, //top
 152                         0.0f,   // left
 153                         90.0f,  // bottom
 154                         180.0f, // right
 155                 };
 156
 157                 // rotate around the hotspot according to which edge it's on
 158                 // since the hotspot == the origin, only rotate the vectors
 159                 matrix4x4_t rotm;
 160                 vec3_t axis;
 161                 vec3_t temp;
 162                 vec2_t dir;
 163                 float angle;
 164
 165                 if(edge < 1 || edge > 4)
 166                         return; // this usually means something went wrong somewhere, there's no way to get a wrong edge value currently
 167
 168                 dir[0] = frame->right + frame->left;
 169                 dir[1] = frame->down + frame->up;
 170
 171                 // only rotate when the hotspot isn't the center though.
 172                 if(dir[0] < MIN_EPSILON && dir[1] < MIN_EPSILON)
 173                 {
 174                         return;
 175                 }
 176
 177                 // Now that we've kicked center-hotspotted sprites, rotate using the appropriate matrix :)
 178
 179                 // determine the angle of a sprite, we could only do that once though and
 180                 // add a `qboolean initialized' to the mspriteframe_t struct... let's get the direction vector of it :)
 181
 182                 angle = atan(dir[1] / dir[0]) * 180.0f/M_PI;
 183
 184                 // we need the real, full angle
 185                 if(dir[0] < 0.0f)
 186                         angle += 180.0f;
 187
 188                 // Rotate around rotation_angle - frame_angle
 189                 // The axis SHOULD equal r_refdef.view.forward, but let's generalize this:
 190                 CrossProduct(up, left, axis);
 191                 if(r_track_sprites_flags.integer & TSF_ROTATE_CONTINOUSLY)
 192                         Matrix4x4_CreateRotate(&rotm, dir_angle - angle, axis[0], axis[1], axis[2]);
 193                 else
 194                         Matrix4x4_CreateRotate(&rotm, rotation_angles[edge] - angle, axis[0], axis[1], axis[2]);
 195                 Matrix4x4_Transform(&rotm, up, temp);
 196                 VectorCopy(temp, up);
 197                 Matrix4x4_Transform(&rotm, left, temp);
 198                 VectorCopy(temp, left);
 199         }
 200 }
 201
 202 void R_Model_Sprite_Draw_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 203 {
 204         int i;
 205         model_t *model = ent->model;
 206         vec3_t left, up, org, mforward, mleft, mup, middle;
 207         float scale, dx, dy, hud_vs_screen;
 208         int edge = 0;
 209         float dir_angle = 0.0f;
 210
 211         // nudge it toward the view to make sure it isn't in a wall
 212         Matrix4x4_ToVectors(&ent->matrix, mforward, mleft, mup, org);
 213         VectorSubtract(org, r_refdef.view.forward, org);
 214         switch(model->sprite.sprnum_type)
 215         {
 216         case SPR_VP_PARALLEL_UPRIGHT:
 217                 // flames and such
 218                 // vertical beam sprite, faces view plane
 219                 scale = ent->scale / sqrt(r_refdef.view.forward[0]*r_refdef.view.forward[0]+r_refdef.view.forward[1]*r_refdef.view.forward[1]);
 220                 left[0] = -r_refdef.view.forward[1] * scale;
 221                 left[1] = r_refdef.view.forward[0] * scale;
 222                 left[2] = 0;
 223                 up[0] = 0;
 224                 up[1] = 0;
 225                 up[2] = ent->scale;
 226                 break;
 227         case SPR_FACING_UPRIGHT:
 228                 // flames and such
 229                 // vertical beam sprite, faces viewer's origin (not the view plane)
 230                 scale = ent->scale / sqrt((org[0] - r_refdef.view.origin[0])*(org[0] - r_refdef.view.origin[0])+(org[1] - r_refdef.view.origin[1])*(org[1] - r_refdef.view.origin[1]));
 231                 left[0] = (org[1] - r_refdef.view.origin[1]) * scale;
 232                 left[1] = -(org[0] - r_refdef.view.origin[0]) * scale;
 233                 left[2] = 0;
 234                 up[0] = 0;
 235                 up[1] = 0;
 236                 up[2] = ent->scale;
 237                 break;
 238         default:
 239                 Con_Printf("R_SpriteSetup: unknown sprite type %i\n", model->sprite.sprnum_type);
 240                 // fall through to normal sprite
 241         case SPR_VP_PARALLEL:
 242                 // normal sprite
 243                 // faces view plane
 244                 VectorScale(r_refdef.view.left, ent->scale, left);
 245                 VectorScale(r_refdef.view.up, ent->scale, up);
 246                 break;
 247         case SPR_LABEL_SCALE:
 248                 // normal sprite
 249                 // faces view plane
 250                 // fixed HUD pixel size specified in sprite
 251                 // honors scale
 252                 // honors a global label scaling cvar
 253
 254                 // See the R_TrackSprite definition for a reason for this copying
 255                 VectorCopy(r_refdef.view.left, left);
 256                 VectorCopy(r_refdef.view.up, up);
 257                 // It has to be done before the calculations, because it moves the origin.
 258                 if(r_track_sprites.integer)
 259                         R_TrackSprite(ent, org, left, up, &edge, &dir_angle);
 260
 261                 scale = 2 * ent->scale * (DotProduct(r_refdef.view.forward, org) - DotProduct(r_refdef.view.forward, r_refdef.view.origin)) * r_labelsprites_scale.value;
 262                 VectorScale(left, scale * r_refdef.view.frustum_x / vid_conwidth.integer, left); // 1px
 263                 VectorScale(up, scale * r_refdef.view.frustum_y / vid_conheight.integer, up); // 1px
 264                 break;
 265         case SPR_LABEL:
 266                 // normal sprite
 267                 // faces view plane
 268                 // fixed pixel size specified in sprite
 269                 // tries to get the right size in HUD units, if possible
 270                 // ignores scale
 271                 // honors a global label scaling cvar before the rounding
 272                 // FIXME assumes that 1qu is 1 pixel in the sprite like in SPR32 format. Should not do that, but instead query the source image! This bug only applies to the roundtopixels case, though.
 273
 274                 // See the R_TrackSprite definition for a reason for this copying
 275                 VectorCopy(r_refdef.view.left, left);
 276                 VectorCopy(r_refdef.view.up, up);
 277                 // It has to be done before the calculations, because it moves the origin.
 278                 if(r_track_sprites.integer)
 279                         R_TrackSprite(ent, org, left, up, &edge, &dir_angle);
 280
 281                 scale = 2 * (DotProduct(r_refdef.view.forward, org) - DotProduct(r_refdef.view.forward, r_refdef.view.origin));
 282
 283                 if(r_labelsprites_roundtopixels.integer)
 284                 {
 285                         hud_vs_screen = max(
 286                                 vid_conwidth.integer / (float) r_refdef.view.width,
 287                                 vid_conheight.integer / (float) r_refdef.view.height
 288                         ) / max(0.125, r_labelsprites_scale.value);
 289
 290                         // snap to "good sizes"
 291                         // 1     for (0.6, 1.41]
 292                         // 2     for (1.8, 3.33]
 293                         if(hud_vs_screen <= 0.6)
 294                                 hud_vs_screen = 0; // don't, use real HUD pixels
 295                         else if(hud_vs_screen <= 1.41)
 296                                 hud_vs_screen = 1;
 297                         else if(hud_vs_screen <= 3.33)
 298                                 hud_vs_screen = 2;
 299                         else
 300                                 hud_vs_screen = 0; // don't, use real HUD pixels
 301
 302                         if(hud_vs_screen)
 303                         {
 304                                 // use screen pixels
 305                                 VectorScale(left, scale * r_refdef.view.frustum_x / (r_refdef.view.width * hud_vs_screen), left); // 1px
 306                                 VectorScale(up, scale * r_refdef.view.frustum_y / (r_refdef.view.height * hud_vs_screen), up); // 1px
 307                         }
 308                         else
 309                         {
 310                                 // use HUD pixels
 311                                 VectorScale(left, scale * r_refdef.view.frustum_x / vid_conwidth.integer * r_labelsprites_scale.value, left); // 1px
 312                                 VectorScale(up, scale * r_refdef.view.frustum_y / vid_conheight.integer * r_labelsprites_scale.value, up); // 1px
 313                         }
 314
 315                         if(hud_vs_screen == 1)
 316                         {
 317                                 VectorMA(r_refdef.view.origin, scale, r_refdef.view.forward, middle); // center of screen in distance scale
 318                                 dx = 0.5 - fmod(r_refdef.view.width * 0.5 + (DotProduct(org, left) - DotProduct(middle, left)) / DotProduct(left, left) + 0.5, 1.0);
 319                                 dy = 0.5 - fmod(r_refdef.view.height * 0.5 + (DotProduct(org, up) - DotProduct(middle, up)) / DotProduct(up, up) + 0.5, 1.0);
 320                                 VectorMAMAM(1, org, dx, left, dy, up, org);
 321                         }
 322                 }
 323                 else
 324                 {
 325                         // use HUD pixels
 326                         VectorScale(left, scale * r_refdef.view.frustum_x / vid_conwidth.integer * r_labelsprites_scale.value, left); // 1px
 327                         VectorScale(up, scale * r_refdef.view.frustum_y / vid_conheight.integer * r_labelsprites_scale.value, up); // 1px
 328                 }
 329                 break;
 330         case SPR_ORIENTED:
 331                 // bullet marks on walls
 332                 // ignores viewer entirely
 333                 VectorCopy(mleft, left);
 334                 VectorCopy(mup, up);
 335                 break;
 336         case SPR_VP_PARALLEL_ORIENTED:
 337                 // I have no idea what people would use this for...
 338                 // oriented relative to view space
 339                 // FIXME: test this and make sure it mimicks software
 340                 left[0] = mleft[0] * r_refdef.view.forward[0] + mleft[1] * r_refdef.view.left[0] + mleft[2] * r_refdef.view.up[0];
 341                 left[1] = mleft[0] * r_refdef.view.forward[1] + mleft[1] * r_refdef.view.left[1] + mleft[2] * r_refdef.view.up[1];
 342                 left[2] = mleft[0] * r_refdef.view.forward[2] + mleft[1] * r_refdef.view.left[2] + mleft[2] * r_refdef.view.up[2];
 343                 up[0] = mup[0] * r_refdef.view.forward[0] + mup[1] * r_refdef.view.left[0] + mup[2] * r_refdef.view.up[0];
 344                 up[1] = mup[0] * r_refdef.view.forward[1] + mup[1] * r_refdef.view.left[1] + mup[2] * r_refdef.view.up[1];
 345                 up[2] = mup[0] * r_refdef.view.forward[2] + mup[1] * r_refdef.view.left[2] + mup[2] * r_refdef.view.up[2];
 346                 break;
 347         }
 348
 349         R_Mesh_Matrix(&identitymatrix);
 350
 351         // LordHavoc: interpolated sprite rendering
 352         for (i = 0;i < 4;i++)
 353         {
 354                 if (ent->frameblend[i].lerp >= 0.01f)
 355                 {
 356                         mspriteframe_t *frame = model->sprite.sprdata_frames + ent->frameblend[i].frame;
 357                         texture_t *texture = model->data_textures + ent->frameblend[i].frame;
 358 #if 0
 359                         vec3_t o, l, u;
 360 #endif
 361                         R_UpdateTextureInfo(ent, texture);
 362
 363                         // SPR_LABEL should not use depth test AT ALL
 364                         if(model->sprite.sprnum_type == SPR_LABEL || model->sprite.sprnum_type == SPR_LABEL_SCALE)
 365                                 if(texture->currentmaterialflags & MATERIALFLAG_SHORTDEPTHRANGE)
 366                                         texture->currentmaterialflags = (texture->currentmaterialflags & ~MATERIALFLAG_SHORTDEPTHRANGE) | MATERIALFLAG_NODEPTHTEST;
 367
 368                         if(edge)
 369                         {
 370                                 // FIXME:: save vectors/origin and re-rotate? necessary if the hotspot can change per frame
 371 #if 0
 372                                 VectorCopy(org, o);
 373                                 VectorCopy(left, l);
 374                                 VectorCopy(up, u);
 375 #endif
 376                                 R_RotateSprite(frame, org, left, up, edge, dir_angle);
 377 #if 1
 378                                 edge = 0;
 379 #endif
 380                         }
 381                         // FIXME: negate left and right in loader
 382                         R_DrawSprite(texture->currentlayers[0].blendfunc1, texture->currentlayers[0].blendfunc2, texture->basetexture, texture->currentskinframe->fog, (texture->currentmaterialflags & MATERIALFLAG_NODEPTHTEST), (texture->currentmaterialflags & MATERIALFLAG_SHORTDEPTHRANGE), org, left, up, frame->left, frame->right, frame->down, frame->up, texture->currentlayers[0].color[0], texture->currentlayers[0].color[1], texture->currentlayers[0].color[2], ent->alpha * ent->frameblend[i].lerp);
 383                         if(edge)
 384                         {
 385 #if 0
 386                                 VectorCopy(o, org);
 387                                 VectorCopy(l, left);
 388                                 VectorCopy(u, up);
 389 #endif
 390                         }
 391                 }
 392         }
 393 }
 394
 395 void R_Model_Sprite_Draw(entity_render_t *ent)
 396 {
 397         vec3_t org;
 398         if (ent->frameblend[0].frame < 0)
 399                 return;
 400
 401         Matrix4x4_OriginFromMatrix(&ent->matrix, org);
 402         R_MeshQueue_AddTransparent(ent->effects & EF_NODEPTHTEST ? r_refdef.view.origin : org, R_Model_Sprite_Draw_TransparentCallback, ent, 0, rsurface.rtlight);
 403 }
 404