r_sprites.c

   1
   2 #include "quakedef.h"
   3
   4 #define LERPSPRITES
   5
   6 static int R_SpriteSetup (const entity_render_t *ent, int type, float org[3], float left[3], float up[3])
   7 {
   8         float matrix1[3][3], matrix2[3][3], matrix3[3][3];
   9
  10         VectorCopy(ent->origin, org);
  11         switch(type)
  12         {
  13         case SPR_VP_PARALLEL_UPRIGHT:
  14                 // flames and such
  15                 // vertical beam sprite, faces view plane
  16                 VectorNegate(vpn, matrix3[0]);
  17                 matrix3[0][2] = 0;
  18                 VectorNormalizeFast(matrix3[0]);
  19                 matrix3[1][0] = matrix3[0][1];
  20                 matrix3[1][1] = -matrix3[0][0];
  21                 matrix3[1][2] = 0;
  22                 matrix3[2][0] = 0;
  23                 matrix3[2][1] = 0;
  24                 matrix3[2][2] = 1;
  25                 break;
  26         case SPR_FACING_UPRIGHT:
  27                 // flames and such
  28                 // vertical beam sprite, faces viewer's origin (not the view plane)
  29                 VectorSubtract(ent->origin, r_origin, matrix3[0]);
  30                 matrix3[0][2] = 0;
  31                 VectorNormalizeFast(matrix3[0]);
  32                 matrix3[1][0] = matrix3[0][1];
  33                 matrix3[1][1] = -matrix3[0][0];
  34                 matrix3[1][2] = 0;
  35                 matrix3[2][0] = 0;
  36                 matrix3[2][1] = 0;
  37                 matrix3[2][2] = 1;
  38                 break;
  39         default:
  40                 Con_Printf("R_SpriteSetup: unknown sprite type %i\n", type);
  41                 // fall through to normal sprite
  42         case SPR_VP_PARALLEL:
  43                 // normal sprite
  44                 // faces view plane
  45                 VectorCopy(vpn, matrix3[0]);
  46                 VectorNegate(vright, matrix3[1]);
  47                 VectorCopy(vup, matrix3[2]);
  48                 break;
  49         case SPR_ORIENTED:
  50                 // bullet marks on walls
  51                 // ignores viewer entirely
  52                 AngleVectorsFLU (ent->angles, matrix3[0], matrix3[1], matrix3[2]);
  53                 // nudge it toward the view, so it will be infront of the wall
  54                 VectorSubtract(org, vpn, org);
  55                 break;
  56         case SPR_VP_PARALLEL_ORIENTED:
  57                 // I have no idea what people would use this for
  58                 // oriented relative to view space
  59                 // FIXME: test this and make sure it mimicks software
  60                 AngleVectorsFLU (ent->angles, matrix1[0], matrix1[1], matrix1[2]);
  61                 VectorCopy(vpn, matrix2[0]);
  62                 VectorNegate(vright, matrix2[1]);
  63                 VectorCopy(vup, matrix2[2]);
  64                 R_ConcatRotations (matrix1[0], matrix2[0], matrix3[0]);
  65                 break;
  66         }
  67
  68         if (ent->scale != 1)
  69         {
  70                 VectorScale(matrix3[1], ent->scale, left);
  71                 VectorScale(matrix3[2], ent->scale, up);
  72         }
  73         else
  74         {
  75                 VectorCopy(matrix3[1], left);
  76                 VectorCopy(matrix3[2], up);
  77         }
  78         return false;
  79 }
  80
  81 static void R_DrawSpriteImage (int additive, mspriteframe_t *frame, int texture, vec3_t origin, vec3_t up, vec3_t left, float red, float green, float blue, float alpha)
  82 {
  83         rmeshstate_t m;
  84         memset(&m, 0, sizeof(m));
  85         m.blendfunc1 = GL_SRC_ALPHA;
  86         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
  87         if (additive)
  88                 m.blendfunc2 = GL_ONE;
  89         m.tex[0] = texture;
  90         R_Mesh_State(&m);
  91
  92         varray_texcoord[0][ 0] = 0;varray_texcoord[0][ 1] = 1;
  93         varray_texcoord[0][ 4] = 0;varray_texcoord[0][ 5] = 0;
  94         varray_texcoord[0][ 8] = 1;varray_texcoord[0][ 9] = 0;
  95         varray_texcoord[0][12] = 1;varray_texcoord[0][13] = 1;
  96         // FIXME: negate left and right in loader
  97         varray_vertex[0] = origin[0] + frame->down * up[0] - frame->left  * left[0];
  98         varray_vertex[1] = origin[1] + frame->down * up[1] - frame->left  * left[1];
  99         varray_vertex[2] = origin[2] + frame->down * up[2] - frame->left  * left[2];
 100         varray_vertex[4] = origin[0] + frame->up   * up[0] - frame->left  * left[0];
 101         varray_vertex[5] = origin[1] + frame->up   * up[1] - frame->left  * left[1];
 102         varray_vertex[6] = origin[2] + frame->up   * up[2] - frame->left  * left[2];
 103         varray_vertex[8] = origin[0] + frame->up   * up[0] - frame->right * left[0];
 104         varray_vertex[9] = origin[1] + frame->up   * up[1] - frame->right * left[1];
 105         varray_vertex[10] = origin[2] + frame->up   * up[2] - frame->right * left[2];
 106         varray_vertex[12] = origin[0] + frame->down * up[0] - frame->right * left[0];
 107         varray_vertex[13] = origin[1] + frame->down * up[1] - frame->right * left[1];
 108         varray_vertex[14] = origin[2] + frame->down * up[2] - frame->right * left[2];
 109         GL_Color(red * r_colorscale, green * r_colorscale, blue * r_colorscale, alpha);
 110         R_Mesh_Draw(4, 2, polygonelements);
 111 }
 112
 113 void R_DrawSpriteModelCallback(const void *calldata1, int calldata2)
 114 {
 115         const entity_render_t *ent = calldata1;
 116         int i;
 117         vec3_t left, up, org, color;
 118         mspriteframe_t *frame;
 119         vec3_t diff;
 120         float fog, ifog;
 121
 122         if (R_SpriteSetup(ent, ent->model->sprnum_type, org, left, up))
 123                 return;
 124
 125         R_Mesh_Matrix(&r_identitymatrix);
 126
 127         if ((ent->model->flags & EF_FULLBRIGHT) || (ent->effects & EF_FULLBRIGHT))
 128                 color[0] = color[1] = color[2] = 1;
 129         else
 130                 R_CompleteLightPoint(color, ent->origin, true, NULL);
 131
 132         if (fogenabled)
 133         {
 134                 VectorSubtract(ent->origin, r_origin, diff);
 135                 fog = exp(fogdensity/DotProduct(diff,diff));
 136                 if (fog > 1)
 137                         fog = 1;
 138         }
 139         else
 140                 fog = 0;
 141         ifog = 1 - fog;
 142
 143 #ifdef LERPSPRITES
 144         // LordHavoc: interpolated sprite rendering
 145         for (i = 0;i < 4;i++)
 146         {
 147                 if (ent->frameblend[i].lerp >= 0.01f)
 148                 {
 149                         frame = ent->model->sprdata_frames + ent->frameblend[i].frame;
 150                         R_DrawSpriteImage((ent->effects & EF_ADDITIVE) || (ent->model->flags & EF_ADDITIVE), frame, R_GetTexture(frame->texture), org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, ent->alpha * ent->frameblend[i].lerp);
 151                         if (fog * ent->frameblend[i].lerp >= 0.01f)
 152                                 R_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * ent->alpha * ent->frameblend[i].lerp);
 153                 }
 154         }
 155 #else
 156         // LordHavoc: no interpolation
 157         frame = NULL;
 158         for (i = 0;i < 4 && ent->frameblend[i].lerp;i++)
 159                 frame = ent->model->sprdata_frames + ent->frameblend[i].frame;
 160
 161         R_DrawSpriteImage((ent->effects & EF_ADDITIVE) || (ent->model->flags & EF_ADDITIVE), frame, R_GetTexture(frame->texture), org, up, left, color[0] * ifog, color[1] * ifog, color[2] * ifog, ent->alpha);
 162         if (fog * ent->frameblend[i].lerp >= 0.01f)
 163                 R_DrawSpriteImage(true, frame, R_GetTexture(frame->fogtexture), org, up, left, fogcolor[0],fogcolor[1],fogcolor[2], fog * ent->alpha);
 164 #endif
 165 }
 166
 167 void R_Model_Sprite_Draw(entity_render_t *ent)
 168 {
 169         if (ent->frameblend[0].frame < 0)
 170                 return;
 171
 172         c_sprites++;
 173
 174         R_MeshQueue_AddTransparent(ent->origin, R_DrawSpriteModelCallback, ent, 0);
 175 }
 176