r_sprites.c

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