r_sprites.c

   1 #include "quakedef.h"
   2
   3 void R_ClipSpriteImage (msprite_t *psprite, 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 = ((mspriteframe_t *)(psprite->ofs_frames + (int) psprite)) + 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 = ((mspriteframe_t *)(psprite->ofs_frames + (int) psprite)) + 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         msprite_t *psprite;
 100
 101         if (currentrenderentity->frameblend[0].frame < 0)
 102                 return;
 103
 104         psprite = Mod_Extradata(currentrenderentity->model);
 105         if (R_SpriteSetup(psprite->type, org, right, up))
 106                 return;
 107
 108         // LordHavoc: interpolated sprite rendering
 109         R_ClipSpriteImage(psprite, org, right, up);
 110 }
 111
 112 void GL_DrawSpriteImage (mspriteframe_t *frame, vec3_t origin, vec3_t up, vec3_t right, byte red, byte green, byte blue, int alpha)
 113 {
 114         byte alphaub;
 115         alphaub = bound(0, alpha, 255);
 116         transpolybegin(R_GetTexture(frame->texture), 0, R_GetTexture(frame->fogtexture), ((currentrenderentity->effects & EF_ADDITIVE) || (currentrenderentity->model->flags & EF_ADDITIVE)) ? TPOLYTYPE_ADD : TPOLYTYPE_ALPHA);
 117         transpolyvertub(origin[0] + frame->down * up[0] + frame->left  * right[0], origin[1] + frame->down * up[1] + frame->left  * right[1], origin[2] + frame->down * up[2] + frame->left  * right[2], 0, 1, red, green, blue, alphaub);
 118         transpolyvertub(origin[0] + frame->up   * up[0] + frame->left  * right[0], origin[1] + frame->up   * up[1] + frame->left  * right[1], origin[2] + frame->up   * up[2] + frame->left  * right[2], 0, 0, red, green, blue, alphaub);
 119         transpolyvertub(origin[0] + frame->up   * up[0] + frame->right * right[0], origin[1] + frame->up   * up[1] + frame->right * right[1], origin[2] + frame->up   * up[2] + frame->right * right[2], 1, 0, red, green, blue, alphaub);
 120         transpolyvertub(origin[0] + frame->down * up[0] + frame->right * right[0], origin[1] + frame->down * up[1] + frame->right * right[1], origin[2] + frame->down * up[2] + frame->right * right[2], 1, 1, red, green, blue, alphaub);
 121         transpolyend();
 122 }
 123
 124 /*
 125 =================
 126 R_DrawSpriteModel
 127 =================
 128 */
 129 void R_DrawSpriteModel ()
 130 {
 131         int                     i;
 132         vec3_t          right, up, org, color;
 133         byte            colorub[4];
 134         msprite_t       *psprite;
 135
 136         if (currentrenderentity->frameblend[0].frame < 0)
 137                 return;
 138
 139         psprite = Mod_Extradata(currentrenderentity->model);
 140         if (R_SpriteSetup(psprite->type, org, right, up))
 141                 return;
 142
 143         c_sprites++;
 144
 145         if ((currentrenderentity->model->flags & EF_FULLBRIGHT) || (currentrenderentity->effects & EF_FULLBRIGHT))
 146         {
 147                 color[0] = currentrenderentity->colormod[0] * 255;
 148                 color[1] = currentrenderentity->colormod[1] * 255;
 149                 color[2] = currentrenderentity->colormod[2] * 255;
 150         }
 151         else
 152                 R_CompleteLightPoint(color, currentrenderentity->origin, true, NULL);
 153
 154         colorub[0] = bound(0, color[0], 255);
 155         colorub[1] = bound(0, color[1], 255);
 156         colorub[2] = bound(0, color[2], 255);
 157
 158         // LordHavoc: interpolated sprite rendering
 159         for (i = 0;i < 4;i++)
 160                 if (currentrenderentity->frameblend[i].lerp)
 161                         GL_DrawSpriteImage(((mspriteframe_t *)(psprite->ofs_frames + (int) psprite)) + currentrenderentity->frameblend[i].frame, org, up, right, colorub[0],colorub[1],colorub[2], currentrenderentity->alpha*255*currentrenderentity->frameblend[i].lerp);
 162 }
 163