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 int spritepolyindex[6] = {0, 1, 2, 0, 2, 3};
 111
 112 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)
 113 {
 114         rmeshinfo_t m;
 115         float v[4][4], st[4][2];
 116         // LordHavoc: this meshinfo must match up with R_Mesh_DrawDecal
 117         // LordHavoc: the commented out lines are hardwired behavior in R_Mesh_DrawDecal
 118         memset(&m, 0, sizeof(m));
 119         m.transparent = true;
 120         m.blendfunc1 = GL_SRC_ALPHA;
 121         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 122         if ((currentrenderentity->effects & EF_ADDITIVE)
 123          || (currentrenderentity->model->flags & EF_ADDITIVE)
 124          || fog)
 125                 m.blendfunc2 = GL_ONE;
 126         m.numtriangles = 2;
 127         m.index = spritepolyindex;
 128         m.numverts = 4;
 129         m.vertex = &v[0][0];
 130         m.vertexstep = sizeof(float[4]);
 131         m.cr = red;
 132         m.cg = green;
 133         m.cb = blue;
 134         m.ca = alpha;
 135         m.tex[0] = texture;
 136         m.texcoords[0] = &st[0][0];
 137         m.texcoordstep[0] = sizeof(float[2]);
 138
 139         v[0][0] = origin[0] + frame->down * up[0] + frame->left  * right[0];
 140         v[0][1] = origin[1] + frame->down * up[1] + frame->left  * right[1];
 141         v[0][2] = origin[2] + frame->down * up[2] + frame->left  * right[2];
 142         v[1][0] = origin[0] + frame->up   * up[0] + frame->left  * right[0];
 143         v[1][1] = origin[1] + frame->up   * up[1] + frame->left  * right[1];
 144         v[1][2] = origin[2] + frame->up   * up[2] + frame->left  * right[2];
 145         v[2][0] = origin[0] + frame->up   * up[0] + frame->right * right[0];
 146         v[2][1] = origin[1] + frame->up   * up[1] + frame->right * right[1];
 147         v[2][2] = origin[2] + frame->up   * up[2] + frame->right * right[2];
 148         v[3][0] = origin[0] + frame->down * up[0] + frame->right * right[0];
 149         v[3][1] = origin[1] + frame->down * up[1] + frame->right * right[1];
 150         v[3][2] = origin[2] + frame->down * up[2] + frame->right * right[2];
 151         st[0][0] = 0;
 152         st[0][1] = 1;
 153         st[1][0] = 0;
 154         st[1][1] = 0;
 155         st[2][0] = 1;
 156         st[2][1] = 0;
 157         st[3][0] = 1;
 158         st[3][1] = 1;
 159
 160         R_Mesh_Draw(&m);
 161 }
 162
 163 /*
 164 =================
 165 R_DrawSpriteModel
 166 =================
 167 */
 168 void R_DrawSpriteModel ()
 169 {
 170         int                     i;
 171         vec3_t          right, up, org, color;
 172         mspriteframe_t *frame;
 173         vec3_t diff;
 174         float           fog, ifog;
 175
 176         if (currentrenderentity->frameblend[0].frame < 0)
 177                 return;
 178
 179         if (R_SpriteSetup(currentrenderentity->model->sprnum_type, org, right, up))
 180                 return;
 181
 182         c_sprites++;
 183
 184         if ((currentrenderentity->model->flags & EF_FULLBRIGHT) || (currentrenderentity->effects & EF_FULLBRIGHT))
 185                 color[0] = color[1] = color[2] = 1;
 186         else
 187                 R_CompleteLightPoint(color, currentrenderentity->origin, true, NULL);
 188
 189         if (fogenabled)
 190         {
 191                 VectorSubtract(currentrenderentity->origin, r_origin, diff);
 192                 fog = exp(fogdensity/DotProduct(diff,diff));
 193                 if (fog > 1)
 194                         fog = 1;
 195         }
 196         else
 197                 fog = 0;
 198         ifog = 1 - fog;
 199
 200         // LordHavoc: interpolated sprite rendering
 201         for (i = 0;i < 4;i++)
 202         {
 203                 if (currentrenderentity->frameblend[i].lerp >= 0.01f)
 204                 {
 205                         frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
 206                         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);
 207                         if (fog * currentrenderentity->frameblend[i].lerp >= 0.01f)
 208                                 GL_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, right, fogcolor[0],fogcolor[1],fogcolor[2], fog * currentrenderentity->alpha * currentrenderentity->frameblend[i].lerp);
 209                 }
 210         }
 211 }