#include <u.h>#include <libc.h>#include <stdio.h>#include "dat.h"#include "fns.h" extern polydesc_t r_polydesc; void R_BuildPolygonFromSurface(msurface_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;	dsprite_t	*s_psprite;	dsprframe_t	*s_psprframe;  	s_psprite = (dsprite_t *)currentmodel->extradata;/*	if (currententity->frame >= s_psprite->numframes		|| currententity->frame < 0)	{		ri.Con_Printf (PRINT_ALL, "No such sprite frame %i\n", 			currententity->frame);		currententity->frame = 0;	}*/	currententity->frame %= s_psprite->numframes; 	s_psprframe = &s_psprite->frames[currententity->frame]; 	r_polydesc.pixels       = currentmodel->skins[currententity->frame]->pixels[0];	r_polydesc.pixel_width  = s_psprframe->width;	r_polydesc.pixel_height = s_psprframe->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, 		s_psprframe->width - s_psprframe->origin_x, right);	VectorScale (r_polydesc.vup, 		s_psprframe->height - s_psprframe->origin_y, up);	VectorScale (r_polydesc.vright,		-s_psprframe->origin_x, left);	VectorScale (r_polydesc.vup,		-s_psprframe->origin_y, down); 	// invert UP vector for sprites	VectorInverse( 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] = s_psprframe->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] = s_psprframe->width;	pverts[2][4] = s_psprframe->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] = s_psprframe->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, false, true );	else		R_ClipAndDrawPoly ( 1.0F, false, true );	r_polydesc.stipple_parity = 0;}