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/*
Copyright (C) 1997-2001 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// r_sprite.c
#include "sw_local.h"
extern polydesc_t r_polydesc;
void R_BuildPolygonFromSurface(mface_t *fa);
void R_PolygonCalculateGradients (void);
extern void R_PolyChooseSpanletRoutine( float alpha, qboolean isturbulent );
extern vec5_t r_clip_verts[2][MAXWORKINGVERTS+2];
extern void R_ClipAndDrawPoly( float alpha, qboolean isturbulent, qboolean textured );
/*
** R_DrawSprite
**
** Draw currententity / currentmodel as a single texture
** mapped polygon
*/
void R_DrawSprite (void)
{
vec5_t *pverts;
vec3_t left, up, right, down;
mspriteframe_t *frame;
frame = ¤tmodel->spriteframes[
currententity->frame % currentmodel->numframes];
r_polydesc.pixels = frame->image->pixels[0];
r_polydesc.pixel_width = frame->width;
r_polydesc.pixel_height = frame->height;
r_polydesc.dist = 0;
// generate the sprite's axes, completely parallel to the viewplane.
VectorCopy (vup, r_polydesc.vup);
VectorCopy (vright, r_polydesc.vright);
VectorCopy (vpn, r_polydesc.vpn);
// build the sprite poster in worldspace
VectorScale (r_polydesc.vright,
frame->width - frame->origin_x, right);
VectorScale (r_polydesc.vup,
frame->height - frame->origin_y, up);
VectorScale (r_polydesc.vright,
-frame->origin_x, left);
VectorScale (r_polydesc.vup,
-frame->origin_y, down);
// invert UP vector for sprites
VectorNegate( r_polydesc.vup, r_polydesc.vup );
pverts = r_clip_verts[0];
pverts[0][0] = r_entorigin[0] + up[0] + left[0];
pverts[0][1] = r_entorigin[1] + up[1] + left[1];
pverts[0][2] = r_entorigin[2] + up[2] + left[2];
pverts[0][3] = 0;
pverts[0][4] = 0;
pverts[1][0] = r_entorigin[0] + up[0] + right[0];
pverts[1][1] = r_entorigin[1] + up[1] + right[1];
pverts[1][2] = r_entorigin[2] + up[2] + right[2];
pverts[1][3] = frame->width;
pverts[1][4] = 0;
pverts[2][0] = r_entorigin[0] + down[0] + right[0];
pverts[2][1] = r_entorigin[1] + down[1] + right[1];
pverts[2][2] = r_entorigin[2] + down[2] + right[2];
pverts[2][3] = frame->width;
pverts[2][4] = frame->height;
pverts[3][0] = r_entorigin[0] + down[0] + left[0];
pverts[3][1] = r_entorigin[1] + down[1] + left[1];
pverts[3][2] = r_entorigin[2] + down[2] + left[2];
pverts[3][3] = 0;
pverts[3][4] = frame->height;
r_polydesc.nump = 4;
r_polydesc.s_offset = ( r_polydesc.pixel_width >> 1);
r_polydesc.t_offset = ( r_polydesc.pixel_height >> 1);
VectorCopy( modelorg, r_polydesc.viewer_position );
r_polydesc.stipple_parity = 1;
if ( currententity->flags & RF_TRANSLUCENT )
R_ClipAndDrawPoly ( currententity->alpha, qfalse, qtrue );
else
R_ClipAndDrawPoly ( 1.0F, qfalse, qtrue );
r_polydesc.stipple_parity = 0;
}
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