r_sprites.c

   1
   2 #include "quakedef.h"
   3
   4 static int R_SpriteSetup (const entity_render_t *ent, int type, float org[3], float left[3], float up[3])
   5 {
   6         float matrix1[3][3], matrix2[3][3], matrix3[3][3];
   7
   8         VectorCopy(ent->origin, org);
   9         switch(type)
  10         {
  11         case SPR_VP_PARALLEL_UPRIGHT:
  12                 // flames and such
  13                 // vertical beam sprite, faces view plane
  14                 VectorNegate(vpn, matrix3[0]);
  15                 matrix3[0][2] = 0;
  16                 VectorNormalizeFast(matrix3[0]);
  17                 matrix3[1][0] = matrix3[0][1];
  18                 matrix3[1][1] = -matrix3[0][0];
  19                 matrix3[1][2] = 0;
  20                 matrix3[2][0] = 0;
  21                 matrix3[2][1] = 0;
  22                 matrix3[2][2] = 1;
  23                 break;
  24         case SPR_FACING_UPRIGHT:
  25                 // flames and such
  26                 // vertical beam sprite, faces viewer's origin (not the view plane)
  27                 VectorSubtract(ent->origin, r_origin, matrix3[0]);
  28                 matrix3[0][2] = 0;
  29                 VectorNormalizeFast(matrix3[0]);
  30                 matrix3[1][0] = matrix3[0][1];
  31                 matrix3[1][1] = -matrix3[0][0];
  32                 matrix3[1][2] = 0;
  33                 matrix3[2][0] = 0;
  34                 matrix3[2][1] = 0;
  35                 matrix3[2][2] = 1;
  36                 break;
  37         default:
  38                 Con_Printf("R_SpriteSetup: unknown sprite type %i\n", type);
  39                 // fall through to normal sprite
  40         case SPR_VP_PARALLEL:
  41                 // normal sprite
  42                 // faces view plane
  43                 VectorCopy(vpn, matrix3[0]);
  44                 VectorNegate(vright, matrix3[1]);
  45                 VectorCopy(vup, matrix3[2]);
  46                 break;
  47         case SPR_ORIENTED:
  48                 // bullet marks on walls
  49                 // ignores viewer entirely
  50                 AngleVectorsFLU (ent->angles, matrix3[0], matrix3[1], matrix3[2]);
  51                 // nudge it toward the view, so it will be infront of the wall
  52                 VectorSubtract(org, vpn, org);
  53                 break;
  54         case SPR_VP_PARALLEL_ORIENTED:
  55                 // I have no idea what people would use this for
  56                 // oriented relative to view space
  57                 // FIXME: test this and make sure it mimicks software
  58                 AngleVectorsFLU (ent->angles, matrix1[0], matrix1[1], matrix1[2]);
  59                 VectorCopy(vpn, matrix2[0]);
  60                 VectorNegate(vright, matrix2[1]);
  61                 VectorCopy(vup, matrix2[2]);
  62                 R_ConcatRotations (matrix1[0], matrix2[0], matrix3[0]);
  63                 break;
  64         }
  65
  66         if (ent->scale != 1)
  67         {
  68                 VectorScale(matrix3[1], ent->scale, left);
  69                 VectorScale(matrix3[2], ent->scale, up);
  70         }
  71         else
  72         {
  73                 VectorCopy(matrix3[1], left);
  74                 VectorCopy(matrix3[2], up);
  75         }
  76         return false;
  77 }
  78
  79 static void R_DrawSpriteImage (int additive, mspriteframe_t *frame, rtexture_t *texture, vec3_t origin, vec3_t up, vec3_t left, float red, float green, float blue, float alpha)
  80 {
  81         // FIXME: negate left and right in loader
  82         R_DrawSprite(GL_SRC_ALPHA, additive ? GL_ONE : GL_ONE_MINUS_SRC_ALPHA, texture, false, origin, left, up, frame->left, frame->right, frame->down, frame->up, red, green, blue, alpha);
  83 }
  84
  85 void R_DrawSpriteModelCallback(const void *calldata1, int calldata2)
  86 {
  87         const entity_render_t *ent = calldata1;
  88         int i;
  89         vec3_t left, up, org, color, diffusecolor, diffusenormal;
  90         mspriteframe_t *frame;
  91         vec3_t diff;
  92         float fog, ifog;
  93
  94         if (R_SpriteSetup(ent, ent->model->sprite.sprnum_type, org, left, up))
  95                 return;
  96
  97         R_Mesh_Matrix(&r_identitymatrix);
  98
  99         if ((ent->model->flags & EF_FULLBRIGHT) || (ent->effects & EF_FULLBRIGHT))
 100                 color[0] = color[1] = color[2] = 1;
 101         else
 102         {
 103                 R_CompleteLightPoint(color, diffusecolor, diffusenormal, ent->origin, true, NULL);
 104                 VectorMA(color, 0.5f, diffusecolor, color);
 105         }
 106
 107         if (fogenabled)
 108         {
 109                 VectorSubtract(ent->origin, r_origin, diff);
 110                 fog = exp(fogdensity/DotProduct(diff,diff));
 111                 if (fog > 1)
 112                         fog = 1;
 113         }
 114         else
 115                 fog = 0;
 116         ifog = 1 - fog;
 117
 118         if (r_lerpsprites.integer)
 119         {
 120                 // LordHavoc: interpolated sprite rendering
 121                 for (i = 0;i < 4;i++)
 122                 {
 123                         if (ent->frameblend[i].lerp >= 0.01f)
 124                         {
 125                                 frame = ent->model->sprite.sprdata_frames + ent->frameblend[i].frame;
 126                                 R_DrawSpriteImage((ent->effects & EF_ADDITIVE) || (ent->model->flags & EF_ADDITIVE), frame, frame->texture, org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, ent->alpha * ent->frameblend[i].lerp);
 127                                 if (fog * ent->frameblend[i].lerp >= 0.01f)
 128                                         R_DrawSpriteImage(true, frame, frame->fogtexture, org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * ent->alpha * ent->frameblend[i].lerp);
 129                         }
 130                 }
 131         }
 132         else
 133         {
 134                 // LordHavoc: no interpolation
 135                 frame = NULL;
 136                 for (i = 0;i < 4 && ent->frameblend[i].lerp;i++)
 137                         frame = ent->model->sprite.sprdata_frames + ent->frameblend[i].frame;
 138
 139                 R_DrawSpriteImage((ent->effects & EF_ADDITIVE) || (ent->model->flags & EF_ADDITIVE), frame, frame->texture, org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, ent->alpha);
 140                 if (fog * ent->frameblend[i].lerp >= 0.01f)
 141                         R_DrawSpriteImage(true, frame, frame->fogtexture, org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * ent->alpha);
 142         }
 143 }
 144
 145 void R_Model_Sprite_Draw(entity_render_t *ent)
 146 {
 147         if (ent->frameblend[0].frame < 0)
 148                 return;
 149
 150         c_sprites++;
 151
 152         R_MeshQueue_AddTransparent(ent->origin, R_DrawSpriteModelCallback, ent, 0);
 153 }
 154