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 left, 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         // FIXME: reverse these in loader to save time
  27         fleft = -fleft;
  28         fright = -fright;
  29         points[0][0] = origin[0] + fdown * up[0] + fleft  * left[0];points[0][1] = origin[1] + fdown * up[1] + fleft  * left[1];points[0][2] = origin[2] + fdown * up[2] + fleft  * left[2];
  30         points[1][0] = origin[0] + fup   * up[0] + fleft  * left[0];points[1][1] = origin[1] + fup   * up[1] + fleft  * left[1];points[1][2] = origin[2] + fup   * up[2] + fleft  * left[2];
  31         points[2][0] = origin[0] + fup   * up[0] + fright * left[0];points[2][1] = origin[1] + fup   * up[1] + fright * left[1];points[2][2] = origin[2] + fup   * up[2] + fright * left[2];
  32         points[3][0] = origin[0] + fdown * up[0] + fright * left[0];points[3][1] = origin[1] + fdown * up[1] + fright * left[1];points[3][2] = origin[2] + fdown * up[2] + fright * left[2];
  33         R_Clip_AddPolygon(&points[0][0], 4, sizeof(float[3]), false, R_Entity_Callback, currentrenderentity, NULL, NULL);
  34 }
  35 #else
  36 void R_ClipSpriteImage (vec3_t origin, vec3_t left, vec3_t up)
  37 {
  38         int i;
  39         mspriteframe_t *frame;
  40         vec3_t points[4];
  41         float fleft, fright, fdown, fup;
  42         frame = NULL;
  43         for (i = 0;i < 4 && currentrenderentity->frameblend[i].lerp;i++)
  44                 frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
  45         fleft  = frame->left;
  46         fdown  = frame->down;
  47         fright = frame->right;
  48         fup    = frame->up;
  49         // FIXME: reverse these in loader to save time
  50         fleft = -fleft;
  51         fright = -fright;
  52         points[0][0] = origin[0] + fdown * up[0] + fleft  * left[0];points[0][1] = origin[1] + fdown * up[1] + fleft  * left[1];points[0][2] = origin[2] + fdown * up[2] + fleft  * left[2];
  53         points[1][0] = origin[0] + fup   * up[0] + fleft  * left[0];points[1][1] = origin[1] + fup   * up[1] + fleft  * left[1];points[1][2] = origin[2] + fup   * up[2] + fleft  * left[2];
  54         points[2][0] = origin[0] + fup   * up[0] + fright * left[0];points[2][1] = origin[1] + fup   * up[1] + fright * left[1];points[2][2] = origin[2] + fup   * up[2] + fright * left[2];
  55         points[3][0] = origin[0] + fdown * up[0] + fright * left[0];points[3][1] = origin[1] + fdown * up[1] + fright * left[1];points[3][2] = origin[2] + fdown * up[2] + fright * left[2];
  56         R_Clip_AddPolygon(&points[0][0], 4, sizeof(float[3]), false, R_Entity_Callback, currentrenderentity, NULL, NULL);
  57 }
  58 #endif
  59
  60 int R_SpriteSetup (int type, float org[3], float left[3], float up[3])
  61 {
  62         float matrix1[3][3], matrix2[3][3], matrix3[3][3];
  63
  64         VectorCopy(currentrenderentity->origin, org);
  65         switch(type)
  66         {
  67         case SPR_VP_PARALLEL_UPRIGHT:
  68                 // flames and such
  69                 // vertical beam sprite, faces view plane
  70                 VectorNegate(vpn, matrix3[0]);
  71                 matrix3[0][2] = 0;
  72                 VectorNormalizeFast(matrix3[0]);
  73                 //VectorVectors(matrix3[0], matrix3[1], matrix3[2]);
  74                 //VectorNegate(matrix3[1], matrix3[1]);
  75                 matrix3[1][0] = matrix3[0][1];
  76                 matrix3[1][1] = -matrix3[0][0];
  77                 matrix3[1][2] = 0;
  78                 matrix3[2][0] = 0;
  79                 matrix3[2][1] = 0;
  80                 matrix3[2][2] = 1;
  81                 break;
  82         case SPR_FACING_UPRIGHT:
  83                 // flames and such
  84                 // vertical beam sprite, faces viewer's origin (not the view plane)
  85                 VectorSubtract(currentrenderentity->origin, r_origin, matrix3[0]);
  86                 matrix3[0][2] = 0;
  87                 VectorNormalizeFast(matrix3[0]);
  88                 //VectorVectors(matrix3[0], matrix3[1], matrix3[2]);
  89                 matrix3[1][0] = matrix3[0][1];
  90                 matrix3[1][1] = -matrix3[0][0];
  91                 matrix3[1][2] = 0;
  92                 matrix3[2][0] = 0;
  93                 matrix3[2][1] = 0;
  94                 matrix3[2][2] = 1;
  95                 break;
  96         default:
  97                 Con_Printf("R_SpriteSetup: unknown sprite type %i\n", type);
  98                 // fall through to normal sprite
  99         case SPR_VP_PARALLEL:
 100                 // normal sprite
 101                 // faces view plane
 102                 VectorCopy(vpn, matrix3[0]);
 103                 VectorNegate(vright, matrix3[1]);
 104                 VectorCopy(vup, matrix3[2]);
 105                 break;
 106         case SPR_ORIENTED:
 107                 // bullet marks on walls
 108                 // ignores viewer entirely
 109                 AngleVectorsFLU (currentrenderentity->angles, matrix3[0], matrix3[1], matrix3[2]);
 110                 // nudge it toward the view, so it will be infront of the wall
 111                 VectorSubtract(org, vpn, org);
 112                 break;
 113         case SPR_VP_PARALLEL_ORIENTED:
 114                 // I have no idea what people would use this for
 115                 // oriented relative to view space
 116                 // FIXME: test this and make sure it mimicks software
 117                 AngleVectorsFLU (currentrenderentity->angles, matrix1[0], matrix1[1], matrix1[2]);
 118                 VectorCopy(vpn, matrix2[0]);
 119                 VectorNegate(vright, matrix2[1]);
 120                 VectorCopy(vup, matrix2[2]);
 121                 R_ConcatRotations (matrix1, matrix2, matrix3);
 122                 break;
 123         }
 124
 125         // don't draw if view origin is behind it
 126         //if (DotProduct(org, matrix3[0]) < (DotProduct(r_origin, matrix3[0]) - 1.0f))
 127         //      return true;
 128
 129         if (currentrenderentity->scale != 1)
 130         {
 131                 VectorScale(matrix3[1], currentrenderentity->scale, left);
 132                 VectorScale(matrix3[2], currentrenderentity->scale, up);
 133         }
 134         else
 135         {
 136                 VectorCopy(matrix3[1], left);
 137                 VectorCopy(matrix3[2], up);
 138         }
 139         return false;
 140 }
 141
 142 void R_ClipSprite (void)
 143 {
 144         vec3_t org, left, up;
 145
 146         if (currentrenderentity->frameblend[0].frame < 0)
 147                 return;
 148
 149         if (R_SpriteSetup(currentrenderentity->model->sprnum_type, org, left, up))
 150                 return;
 151
 152         // LordHavoc: interpolated sprite rendering
 153         R_ClipSpriteImage(org, left, up);
 154 }
 155
 156 int spritepolyindex[6] = {0, 1, 2, 0, 2, 3};
 157
 158 void GL_DrawSpriteImage (int fog, mspriteframe_t *frame, int texture, vec3_t origin, vec3_t up, vec3_t left, float red, float green, float blue, float alpha)
 159 {
 160         rmeshinfo_t m;
 161         float v[4][4], st[4][2];
 162         memset(&m, 0, sizeof(m));
 163         m.transparent = true;
 164         m.blendfunc1 = GL_SRC_ALPHA;
 165         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 166         if ((currentrenderentity->effects & EF_ADDITIVE)
 167          || (currentrenderentity->model->flags & EF_ADDITIVE)
 168          || fog)
 169                 m.blendfunc2 = GL_ONE;
 170         m.numtriangles = 2;
 171         m.index = spritepolyindex;
 172         m.numverts = 4;
 173         m.vertex = &v[0][0];
 174         m.vertexstep = sizeof(float[4]);
 175         m.cr = red;
 176         m.cg = green;
 177         m.cb = blue;
 178         m.ca = alpha;
 179         m.tex[0] = texture;
 180         m.texcoords[0] = &st[0][0];
 181         m.texcoordstep[0] = sizeof(float[2]);
 182
 183         // FIXME: negate left and right in loader
 184         v[0][0] = origin[0] + frame->down * up[0] - frame->left  * left[0];
 185         v[0][1] = origin[1] + frame->down * up[1] - frame->left  * left[1];
 186         v[0][2] = origin[2] + frame->down * up[2] - frame->left  * left[2];
 187         v[1][0] = origin[0] + frame->up   * up[0] - frame->left  * left[0];
 188         v[1][1] = origin[1] + frame->up   * up[1] - frame->left  * left[1];
 189         v[1][2] = origin[2] + frame->up   * up[2] - frame->left  * left[2];
 190         v[2][0] = origin[0] + frame->up   * up[0] - frame->right * left[0];
 191         v[2][1] = origin[1] + frame->up   * up[1] - frame->right * left[1];
 192         v[2][2] = origin[2] + frame->up   * up[2] - frame->right * left[2];
 193         v[3][0] = origin[0] + frame->down * up[0] - frame->right * left[0];
 194         v[3][1] = origin[1] + frame->down * up[1] - frame->right * left[1];
 195         v[3][2] = origin[2] + frame->down * up[2] - frame->right * left[2];
 196         st[0][0] = 0;
 197         st[0][1] = 1;
 198         st[1][0] = 0;
 199         st[1][1] = 0;
 200         st[2][0] = 1;
 201         st[2][1] = 0;
 202         st[3][0] = 1;
 203         st[3][1] = 1;
 204
 205         R_Mesh_Draw(&m);
 206 }
 207
 208 /*
 209 =================
 210 R_DrawSpriteModel
 211 =================
 212 */
 213 void R_DrawSpriteModel ()
 214 {
 215         int                     i;
 216         vec3_t          left, up, org, color;
 217         mspriteframe_t *frame;
 218         vec3_t diff;
 219         float           fog, ifog;
 220
 221         if (currentrenderentity->frameblend[0].frame < 0)
 222                 return;
 223
 224         if (R_SpriteSetup(currentrenderentity->model->sprnum_type, org, left, up))
 225                 return;
 226
 227         c_sprites++;
 228
 229         if ((currentrenderentity->model->flags & EF_FULLBRIGHT) || (currentrenderentity->effects & EF_FULLBRIGHT))
 230                 color[0] = color[1] = color[2] = 1;
 231         else
 232                 R_CompleteLightPoint(color, currentrenderentity->origin, true, NULL);
 233
 234         if (fogenabled)
 235         {
 236                 VectorSubtract(currentrenderentity->origin, r_origin, diff);
 237                 fog = exp(fogdensity/DotProduct(diff,diff));
 238                 if (fog > 1)
 239                         fog = 1;
 240         }
 241         else
 242                 fog = 0;
 243         ifog = 1 - fog;
 244
 245 #ifdef LERPSPRITES
 246         // LordHavoc: interpolated sprite rendering
 247         for (i = 0;i < 4;i++)
 248         {
 249                 if (currentrenderentity->frameblend[i].lerp >= 0.01f)
 250                 {
 251                         frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
 252                         GL_DrawSpriteImage(false, frame, R_GetTexture(frame->texture), org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, currentrenderentity->alpha * currentrenderentity->frameblend[i].lerp);
 253                         if (fog * currentrenderentity->frameblend[i].lerp >= 0.01f)
 254                                 GL_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * currentrenderentity->alpha * currentrenderentity->frameblend[i].lerp);
 255                 }
 256         }
 257 #else
 258         // LordHavoc: no interpolation
 259         frame = NULL;
 260         for (i = 0;i < 4 && currentrenderentity->frameblend[i].lerp;i++)
 261                 frame = currentrenderentity->model->sprdata_frames + currentrenderentity->frameblend[i].frame;
 262
 263         GL_DrawSpriteImage(false, frame, R_GetTexture(frame->texture), org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, currentrenderentity->alpha);
 264         if (fog * currentrenderentity->frameblend[i].lerp >= 0.01f)
 265                 GL_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * currentrenderentity->alpha);
 266 #endif
 267 }