r_sprites.c

   1 #include "quakedef.h"
   2
   3 // LordHavoc: disabled lerping
   4 #define LERPSPRITES
   5
   6 #ifdef LERPSPRITES
   7 void R_ClipSpriteImage (vec3_t origin, vec3_t right, vec3_t up)
   8 {
   9         int i;
  10         mspriteframe_t *frame;
  11         vec3_t points[4];
  12         float fleft, fright, fdown, fup;
  13         frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[0].frame;
  14         fleft  = frame->left;
  15         fdown  = frame->down;
  16         fright = frame->right;
  17         fup    = frame->up;
  18         for (i = 1;i < 4 && currentrenderentity->frameblend[i].lerp;i++)
  19         {
  20                 frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
  21                 fleft  = min(fleft , frame->left );
  22                 fdown  = min(fdown , frame->down );
  23                 fright = max(fright, frame->right);
  24                 fup    = max(fup   , frame->up   );
  25         }
  26         points[0][0] = origin[0] + fdown * up[0] + fleft  * right[0];points[0][1] = origin[1] + fdown * up[1] + fleft  * right[1];points[0][2] = origin[2] + fdown * up[2] + fleft  * right[2];
  27         points[1][0] = origin[0] + fup   * up[0] + fleft  * right[0];points[1][1] = origin[1] + fup   * up[1] + fleft  * right[1];points[1][2] = origin[2] + fup   * up[2] + fleft  * right[2];
  28         points[2][0] = origin[0] + fup   * up[0] + fright * right[0];points[2][1] = origin[1] + fup   * up[1] + fright * right[1];points[2][2] = origin[2] + fup   * up[2] + fright * right[2];
  29         points[3][0] = origin[0] + fdown * up[0] + fright * right[0];points[3][1] = origin[1] + fdown * up[1] + fright * right[1];points[3][2] = origin[2] + fdown * up[2] + fright * right[2];
  30         R_Clip_AddPolygon(&points[0][0], 4, sizeof(float[3]), false, R_Entity_Callback, currentrenderentity, NULL, NULL);
  31 }
  32 #else
  33 void R_ClipSpriteImage (vec3_t origin, vec3_t right, vec3_t up)
  34 {
  35         int i;
  36         mspriteframe_t *frame;
  37         vec3_t points[4];
  38         float fleft, fright, fdown, fup;
  39         frame = NULL;
  40         for (i = 0;i < 4 && currentrenderentity->frameblend[i].lerp;i++)
  41                 frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
  42         fleft  = frame->left;
  43         fdown  = frame->down;
  44         fright = frame->right;
  45         fup    = frame->up;
  46         points[0][0] = origin[0] + fdown * up[0] + fleft  * right[0];points[0][1] = origin[1] + fdown * up[1] + fleft  * right[1];points[0][2] = origin[2] + fdown * up[2] + fleft  * right[2];
  47         points[1][0] = origin[0] + fup   * up[0] + fleft  * right[0];points[1][1] = origin[1] + fup   * up[1] + fleft  * right[1];points[1][2] = origin[2] + fup   * up[2] + fleft  * right[2];
  48         points[2][0] = origin[0] + fup   * up[0] + fright * right[0];points[2][1] = origin[1] + fup   * up[1] + fright * right[1];points[2][2] = origin[2] + fup   * up[2] + fright * right[2];
  49         points[3][0] = origin[0] + fdown * up[0] + fright * right[0];points[3][1] = origin[1] + fdown * up[1] + fright * right[1];points[3][2] = origin[2] + fdown * up[2] + fright * right[2];
  50         R_Clip_AddPolygon(&points[0][0], 4, sizeof(float[3]), false, R_Entity_Callback, currentrenderentity, NULL, NULL);
  51 }
  52 #endif
  53
  54 int R_SpriteSetup (int type, float org[3], float right[3], float up[3])
  55 {
  56         float matrix1[3][3], matrix2[3][3], matrix3[3][3];
  57
  58         VectorCopy(currentrenderentity->origin, org);
  59         switch(type)
  60         {
  61         case SPR_VP_PARALLEL_UPRIGHT:
  62                 // flames and such
  63                 // vertical beam sprite, faces view plane
  64                 VectorNegate(vpn, matrix3[0]);
  65                 matrix3[0][2] = 0;
  66                 VectorNormalizeFast(matrix3[0]);
  67                 VectorVectors(matrix3[0], matrix3[1], matrix3[2]);
  68                 break;
  69         case SPR_FACING_UPRIGHT:
  70                 // flames and such
  71                 // vertical beam sprite, faces viewer's origin (not the view plane)
  72                 VectorSubtract(r_origin, currentrenderentity->origin, matrix3[0]);
  73                 matrix3[0][2] = 0;
  74                 VectorNormalizeFast(matrix3[0]);
  75                 VectorVectors(matrix3[0], matrix3[1], matrix3[2]);
  76                 break;
  77         default:
  78                 Con_Printf("R_SpriteSetup: unknown sprite type %i\n", type);
  79                 // fall through to normal sprite
  80         case SPR_VP_PARALLEL:
  81                 // normal sprite
  82                 // faces view plane
  83                 VectorCopy(vpn, matrix3[0]);
  84                 VectorCopy(vright, matrix3[1]);
  85                 VectorCopy(vup, matrix3[2]);
  86                 break;
  87         case SPR_ORIENTED:
  88                 // bullet marks on walls
  89                 // ignores viewer entirely
  90                 AngleVectors (currentrenderentity->angles, matrix3[0], matrix3[1], matrix3[2]);
  91                 // nudge it toward the view, so it will be infront of the wall
  92                 VectorSubtract(org, vpn, org);
  93                 break;
  94         case SPR_VP_PARALLEL_ORIENTED:
  95                 // I have no idea what people would use this for
  96                 // oriented relative to view space
  97                 // FIXME: test this and make sure it mimicks software
  98                 AngleVectors (currentrenderentity->angles, matrix1[0], matrix1[1], matrix1[2]);
  99                 VectorCopy(vpn, matrix2[0]);
 100                 VectorCopy(vright, matrix2[1]);
 101                 VectorCopy(vup, matrix2[2]);
 102                 R_ConcatRotations (matrix1, matrix2, matrix3);
 103                 break;
 104         }
 105
 106         // don't draw if view origin is behind it
 107         if (DotProduct(org, matrix3[0]) < (DotProduct(r_origin, matrix3[0]) - 1.0f))
 108                 return true;
 109
 110         if (currentrenderentity->scale != 1)
 111         {
 112                 VectorScale(matrix3[1], currentrenderentity->scale, matrix3[1]);
 113                 VectorScale(matrix3[2], currentrenderentity->scale, matrix3[2]);
 114         }
 115
 116         VectorCopy(matrix3[1], right);
 117         VectorCopy(matrix3[2], up);
 118         return false;
 119 }
 120
 121 void R_ClipSprite (void)
 122 {
 123         vec3_t org, right, up;
 124
 125         if (currentrenderentity->frameblend[0].frame < 0)
 126                 return;
 127
 128         if (R_SpriteSetup(currentrenderentity->model->sprnum_type, org, right, up))
 129                 return;
 130
 131         // LordHavoc: interpolated sprite rendering
 132         R_ClipSpriteImage(org, right, up);
 133 }
 134
 135 int spritepolyindex[6] = {0, 1, 2, 0, 2, 3};
 136
 137 void GL_DrawSpriteImage (int fog, mspriteframe_t *frame, int texture, vec3_t origin, vec3_t up, vec3_t right, float red, float green, float blue, float alpha)
 138 {
 139         rmeshinfo_t m;
 140         float v[4][4], st[4][2];
 141         // LordHavoc: this meshinfo must match up with R_Mesh_DrawDecal
 142         // LordHavoc: the commented out lines are hardwired behavior in R_Mesh_DrawDecal
 143         memset(&m, 0, sizeof(m));
 144         m.transparent = true;
 145         m.blendfunc1 = GL_SRC_ALPHA;
 146         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 147         if ((currentrenderentity->effects & EF_ADDITIVE)
 148          || (currentrenderentity->model->flags & EF_ADDITIVE)
 149          || fog)
 150                 m.blendfunc2 = GL_ONE;
 151         m.numtriangles = 2;
 152         m.index = spritepolyindex;
 153         m.numverts = 4;
 154         m.vertex = &v[0][0];
 155         m.vertexstep = sizeof(float[4]);
 156         m.cr = red;
 157         m.cg = green;
 158         m.cb = blue;
 159         m.ca = alpha;
 160         m.tex[0] = texture;
 161         m.texcoords[0] = &st[0][0];
 162         m.texcoordstep[0] = sizeof(float[2]);
 163
 164         v[0][0] = origin[0] + frame->down * up[0] + frame->left  * right[0];
 165         v[0][1] = origin[1] + frame->down * up[1] + frame->left  * right[1];
 166         v[0][2] = origin[2] + frame->down * up[2] + frame->left  * right[2];
 167         v[1][0] = origin[0] + frame->up   * up[0] + frame->left  * right[0];
 168         v[1][1] = origin[1] + frame->up   * up[1] + frame->left  * right[1];
 169         v[1][2] = origin[2] + frame->up   * up[2] + frame->left  * right[2];
 170         v[2][0] = origin[0] + frame->up   * up[0] + frame->right * right[0];
 171         v[2][1] = origin[1] + frame->up   * up[1] + frame->right * right[1];
 172         v[2][2] = origin[2] + frame->up   * up[2] + frame->right * right[2];
 173         v[3][0] = origin[0] + frame->down * up[0] + frame->right * right[0];
 174         v[3][1] = origin[1] + frame->down * up[1] + frame->right * right[1];
 175         v[3][2] = origin[2] + frame->down * up[2] + frame->right * right[2];
 176         st[0][0] = 0;
 177         st[0][1] = 1;
 178         st[1][0] = 0;
 179         st[1][1] = 0;
 180         st[2][0] = 1;
 181         st[2][1] = 0;
 182         st[3][0] = 1;
 183         st[3][1] = 1;
 184
 185         R_Mesh_Draw(&m);
 186 }
 187
 188 /*
 189 =================
 190 R_DrawSpriteModel
 191 =================
 192 */
 193 void R_DrawSpriteModel ()
 194 {
 195         int                     i;
 196         vec3_t          right, up, org, color;
 197         mspriteframe_t *frame;
 198         vec3_t diff;
 199         float           fog, ifog;
 200
 201         if (currentrenderentity->frameblend[0].frame < 0)
 202                 return;
 203
 204         if (R_SpriteSetup(currentrenderentity->model->sprnum_type, org, right, up))
 205                 return;
 206
 207         c_sprites++;
 208
 209         if ((currentrenderentity->model->flags & EF_FULLBRIGHT) || (currentrenderentity->effects & EF_FULLBRIGHT))
 210                 color[0] = color[1] = color[2] = 1;
 211         else
 212                 R_CompleteLightPoint(color, currentrenderentity->origin, true, NULL);
 213
 214         if (fogenabled)
 215         {
 216                 VectorSubtract(currentrenderentity->origin, r_origin, diff);
 217                 fog = exp(fogdensity/DotProduct(diff,diff));
 218                 if (fog > 1)
 219                         fog = 1;
 220         }
 221         else
 222                 fog = 0;
 223         ifog = 1 - fog;
 224
 225 #ifdef LERPSPRITES
 226         // LordHavoc: interpolated sprite rendering
 227         for (i = 0;i < 4;i++)
 228         {
 229                 if (currentrenderentity->frameblend[i].lerp >= 0.01f)
 230                 {
 231                         frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
 232                         GL_DrawSpriteImage(false, frame, R_GetTexture(frame->texture), org, up, right, color[0] * ifog, color[1] * ifog, color[2] * ifog, currentrenderentity->alpha * currentrenderentity->frameblend[i].lerp);
 233                         if (fog * currentrenderentity->frameblend[i].lerp >= 0.01f)
 234                                 GL_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, right, fogcolor[0],fogcolor[1],fogcolor[2], fog * currentrenderentity->alpha * currentrenderentity->frameblend[i].lerp);
 235                 }
 236         }
 237 #else
 238         // LordHavoc: no interpolation
 239         frame = NULL;
 240         for (i = 0;i < 4 && currentrenderentity->frameblend[i].lerp;i++)
 241                 frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
 242
 243         GL_DrawSpriteImage(false, frame, R_GetTexture(frame->texture), org, up, right, color[0] * ifog, color[1] * ifog, color[2] * ifog, currentrenderentity->alpha);
 244         if (fog * currentrenderentity->frameblend[i].lerp >= 0.01f)
 245                 GL_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, right, fogcolor[0],fogcolor[1],fogcolor[2], fog * currentrenderentity->alpha);
 246 #endif
 247 }