void R_DrawSpriteModel (entity_t *e)
{
vec3_t point, forward, right, up;
mspriteframe_t *frame;
msprite_t *psprite;
extern void R_SetupLighting (entity_t *ent);
float out[3], l;
extern float shadelight, ambientlight;

R_SetupLighting(e);
l = ((shadelight + ambientlight) / 256);
out[0]=out[1]=out[2]= 0.99609375;

// don't even bother culling, because it's just a single
// polygon without a surface cache
frame = R_GetSpriteFrame (e);
psprite = currententity->model->cache.data;

if (psprite->type == SPR_ORIENTED)
{
// bullet marks on walls
AngleVectors (currententity->angles, forward, right, up);
}
else if (psprite->type == SPR_FACING_UPRIGHT)
{
VectorSet (up, 0, 0, 1);
right[0] = e->origin[1] - r_origin[1];
right[1] = -(e->origin[0] - r_origin[0]);
right[2] = 0;
VectorNormalize (right);
}
else if (psprite->type == SPR_VP_PARALLEL_UPRIGHT)
{
VectorSet (up, 0, 0, 1);
VectorCopy (vright, right);
}
else
{ // normal sprite
VectorCopy (vup, up);
VectorCopy (vright, right);
}

GL_Bind (frame->gl_texturenum);

glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

VectorScale(out, l, out);// lower lightlevel in shade

glColor4f(out[0], out[1], out[2], 1);

glBegin (GL_QUADS);

glTexCoord2f (0, 1);
VectorMA (e->origin, frame->down, up, point);
VectorMA (point, frame->left, right, point);
glVertex3fv (point);

glTexCoord2f (0, 0);
VectorMA (e->origin, frame->up, up, point);
VectorMA (point, frame->left, right, point);
glVertex3fv (point);

glTexCoord2f (1, 0);
VectorMA (e->origin, frame->up, up, point);
VectorMA (point, frame->right, right, point);
glVertex3fv (point);

glTexCoord2f (1, 1);
VectorMA (e->origin, frame->down, up, point);
VectorMA (point, frame->right, right, point);
glVertex3fv (point);

glEnd ();
glColor4f(1,1,1,1);
}