//#include <stdio.h>
#ifdef __WINDOWS__
#include <windows.h>
#include <stddef.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include <string.h>
#include <math.h>
#include "ogl_init.h"
#include "3d.h"
#include "piggy.h"
#include "../../3d/globvars.h"
#include "error.h"
#include "texmap.h"
#include "palette.h"
#include "rle.h"
#include "mono.h"
#include "u_mem.h"
#include "segment.h"
#include "textures.h"
#include "texmerge.h"
#include "effects.h"
#include "weapon.h"
#include "powerup.h"
#include "polyobj.h"
#include "gamefont.h"

//change to 1 for lots of spew.
#if 0
#define glmprintf(a) mprintf(a)
#else
#define glmprintf(a)
#endif

#ifndef M_PI
#define M_PI 3.14159
#endif

#ifdef __WINDOWS__
#define cosf(a) cos(a)
#define sinf(a) sin(a)
#endif

unsigned char *ogl_pal=gr_palette;

int GL_texmagfilt=GL_NEAREST;
int GL_texminfilt=GL_NEAREST;
int GL_needmipmaps=0;

int last_width=-1,last_height=-1;
int GL_TEXTURE_2D_enabled=-1;
int GL_texclamp_enabled=-1;

extern int gr_renderstats;
extern int gr_badtexture;
int ogl_alttexmerge=1;//merge textures by just printing the seperate textures?
int ogl_rgba_format=4;
int ogl_intensity4_ok=1;
int ogl_luminance4_alpha4_ok=1;
int ogl_rgba2_ok=1;
int ogl_readpixels_ok=1;
int ogl_gettexlevelparam_ok=1;
#ifdef GL_ARB_multitexture
int ogl_arb_multitexture_ok=0;
#endif
#ifdef GL_SGIS_multitexture
int ogl_sgis_multitexture_ok=0;
#endif

int sphereh=0;
int circleh5=0;
int circleh10=0;
int cross_lh[2]={0,0};
int primary_lh[3]={0,0,0};
int secondary_lh[5]={0,0,0,0,0};
int bNoDepthTest=0;
extern int glalpha_effects;
extern GLubyte *pixels;
extern GLubyte *texbuf;

/*int lastbound=-1;

#define OGL_BINDTEXTURE(a) if(gr_badtexture>0) glBindTexture(GL_TEXTURE_2D, 0);\
	else if(a!=lastbound) {glBindTexture(GL_TEXTURE_2D, a);lastbound=a;}*/
#define OGL_BINDTEXTURE(a) if(gr_badtexture>0) glBindTexture(GL_TEXTURE_2D, 0);\
	else glBindTexture(GL_TEXTURE_2D, a);


ogl_texture ogl_texture_list[OGL_TEXTURE_LIST_SIZE];
int ogl_texture_list_cur;

void ogl_init_texture_stats(ogl_texture* t){
	t->prio=0.3;//default prio
	t->lastrend=0;
	t->numrend=0;
}
void ogl_init_texture(ogl_texture* t){
	t->handle=0;
	t->internalformat=ogl_rgba_format;
	t->format=GL_RGBA;
	t->wrapstate=-1;
	t->w=t->h=0;
	ogl_init_texture_stats(t);
}
void ogl_reset_texture_stats_internal(void){
	int i;
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++)
		if (ogl_texture_list[i].handle>0){
			ogl_init_texture_stats(&ogl_texture_list[i]);
		}
}
void ogl_init_texture_list_internal(void){
	int i;
	ogl_texture_list_cur=0;
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++)
		ogl_init_texture(&ogl_texture_list[i]);
}
void ogl_smash_texture_list_internal(void){
	int i;
	sphereh=0;
	memset(cross_lh,0,sizeof(cross_lh));
	memset(primary_lh,0,sizeof(primary_lh));
	memset(secondary_lh,0,sizeof(secondary_lh));
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++){
		if (ogl_texture_list[i].handle>0){
			glDeleteTextures( 1, &ogl_texture_list[i].handle );
			ogl_texture_list[i].handle=0;
		}
		ogl_texture_list[i].wrapstate=-1;
	}
}
void ogl_vivify_texture_list_internal(void){
/*
   int i;
	ogl_texture* t;
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++){
		t=&ogl_texture_list[i];
		if (t->w>0){//erk, realised this can't be done since we'd need the texture bm_data too. hmmm.
			ogl_loadbmtexture(t);
	}
*/
}

ogl_texture* ogl_get_free_texture(void){
	int i;
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++){
		if (ogl_texture_list[ogl_texture_list_cur].handle<=0 && ogl_texture_list[ogl_texture_list_cur].w==0)
			return &ogl_texture_list[ogl_texture_list_cur];
		if (++ogl_texture_list_cur>=OGL_TEXTURE_LIST_SIZE)
			ogl_texture_list_cur=0;
	}
	Error("OGL: texture list full!\n");
//	return NULL;
}
int ogl_texture_stats(void){
	int used=0,usedl4a4=0,usedrgba=0,databytes=0,truebytes=0,datatexel=0,truetexel=0,i;
	int prio0=0,prio1=0,prio2=0,prio3=0,prioh=0;
//	int grabbed=0;
	ogl_texture* t;
	for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++){
		t=&ogl_texture_list[i];
		if (t->handle>0){
			used++;
			datatexel+=t->w*t->h;
			truetexel+=t->tw*t->th;
			databytes+=t->bytesu;
			truebytes+=t->bytes;
			if (t->prio<0.299)prio0++;
			else if (t->prio<0.399)prio1++;
			else if (t->prio<0.499)prio2++;
			else if (t->prio<0.599)prio3++;
			else prioh++;
		}
//		else if(t->w!=0)
//			grabbed++;
	}
	if (gr_renderstats){
		gr_printf(5,FONTSCALE_Y(GAME_FONT->ft_h*14+3*14),"%i(%i,%i) %iK(%iK wasted)",used,usedrgba,usedl4a4,truebytes/1024,(truebytes-databytes)/1024);
	}
//	glmprintf((0,"ogl tex stats: %i(%i,%i|%i,%i,%i,%i,%i) %i(%i)b (%i(%i)wasted)\n",used,usedrgba,usedl4a4,prio0,prio1,prio2,prio3,prioh,truebytes,truetexel,truebytes-databytes,truetexel-datatexel));
	return truebytes;
}
int ogl_mem_target=-1;
void ogl_clean_texture_cache(void){
	ogl_texture* t;
	int i,bytes;
	int time=120;
	
	if (ogl_mem_target<0){
		if (gr_renderstats)
			ogl_texture_stats();
		return;
	}
	
	bytes=ogl_texture_stats();
	while (bytes>ogl_mem_target){
		for (i=0;i<OGL_TEXTURE_LIST_SIZE;i++){
			t=&ogl_texture_list[i];
			if (t->handle>0){
				if (t->lastrend+f1_0*time<GameTime){
					ogl_freetexture(t);
					bytes-=t->bytes;
					if (bytes<ogl_mem_target)
						return;
				}
			}
		}
		if (time==0)
			Error("not enough mem?");
		time=time/2;
	}
	
}
void ogl_bindbmtex(grs_bitmap *bm){
	if (bm->gltexture==NULL || bm->gltexture->handle<=0)
		ogl_loadbmtexture(bm);
	OGL_BINDTEXTURE(bm->gltexture->handle);
	bm->gltexture->lastrend=GameTime;
	bm->gltexture->numrend++;
////	if (bm->gltexture->numrend==80 || bm->gltexture->numrend==4000 || bm->gltexture->numrend==80000){
//	if (bm->gltexture->numrend==100){
//		bm->gltexture->prio+=0.1;
////		glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_PRIORITY,bm->gltexture->prio);
//		glPrioritizeTextures(1,&bm->gltexture->handle,&bm->gltexture->prio);
//	}
}
//gltexture MUST be bound first
void ogl_texwrap(ogl_texture *gltexture,int state){
	if (gltexture->wrapstate!=state || gltexture->numrend<1){
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, state);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, state);
		gltexture->wrapstate=state;
	}
}

//crude texture precaching
//handles: powerups, walls, weapons, polymodels, etc.
//it is done with the horrid do_special_effects kludge so that sides that have to be texmerged and have animated textures will be correctly cached.
//similarly, with the objects(esp weapons), we could just go through and cache em all instead, but that would get ones that might not even be on the level
//TODO: doors

void ogl_cache_polymodel_textures(int model_num){
	polymodel *po=&Polygon_models[model_num];
	int i;
	for (i=0;i<po->n_textures;i++)  {
//		texture_list_index[i] = ObjBitmaps[ObjBitmapPtrs[po->first_texture+i]];
		ogl_loadbmtexture(&GameBitmaps[ObjBitmaps[ObjBitmapPtrs[po->first_texture+i]].index]);
	}
}
void ogl_cache_vclip_textures(vclip *vc){
	int i;
	for (i=0;i<vc->num_frames;i++){
		PIGGY_PAGE_IN(vc->frames[i]);
		ogl_loadbmtexture(&GameBitmaps[vc->frames[i].index]);
	}
}
#define ogl_cache_vclipn_textures(i) ogl_cache_vclip_textures(&Vclip[i])
void ogl_cache_weapon_textures(weapon_info *w){
	ogl_cache_vclipn_textures(w->flash_vclip);
	ogl_cache_vclipn_textures(w->robot_hit_vclip);
	ogl_cache_vclipn_textures(w->wall_hit_vclip);
	if (w->render_type==WEAPON_RENDER_VCLIP)
		ogl_cache_vclipn_textures(w->weapon_vclip);
	else if (w->render_type==WEAPON_RENDER_POLYMODEL)
		ogl_cache_polymodel_textures(w->model_num);
}
void ogl_cache_level_textures(void){
	int seg,side,i;
	eclip *ec;
	short tmap1,tmap2;
	grs_bitmap *bm,*bm2;
	struct side *sidep;
	int max_efx=0,ef;
	
	ogl_reset_texture_stats_internal();//loading a new lev should reset textures
	
	for (i=0,ec=Effects;i<Num_effects;i++,ec++) {
		if ((Effects[i].changing_wall_texture == -1) && (Effects[i].changing_object_texture==-1) )
			continue;
		if (ec->vc.num_frames>max_efx)
			max_efx=ec->vc.num_frames;
	}
	glmprintf((0,"max_efx:%i\n",max_efx));
	for (ef=0;ef<max_efx;ef++){
		for (i=0,ec=Effects;i<Num_effects;i++,ec++) {
			if ((Effects[i].changing_wall_texture == -1) && (Effects[i].changing_object_texture==-1) )
				continue;
//			if (ec->vc.num_frames>max_efx)
//				max_efx=ec->vc.num_frames;
			ec->time_left=-1;
		}
		do_special_effects();

		for (seg=0;seg<Num_segments;seg++){
			for (side=0;side<MAX_SIDES_PER_SEGMENT;side++){
				sidep=&Segments[seg].sides[side];
				tmap1=sidep->tmap_num;
				tmap2=sidep->tmap_num2;
				if (tmap1<0 || tmap1>=NumTextures){
					glmprintf((0,"ogl_cache_level_textures %i %i %i %i\n",seg,side,tmap1,NumTextures));
					//				tmap1=0;
					continue;
				}
				PIGGY_PAGE_IN(Textures[tmap1]);
				bm = &GameBitmaps[Textures[tmap1].index];
				if (tmap2 != 0){
					PIGGY_PAGE_IN(Textures[tmap2&0x3FFF]);
					bm2 = &GameBitmaps[Textures[tmap2&0x3FFF].index];
					if (ogl_alttexmerge==0 || (bm2->bm_flags & BM_FLAG_SUPER_TRANSPARENT))
						bm = texmerge_get_cached_bitmap( tmap1, tmap2 );
					else {
						ogl_loadbmtexture(bm2);
					}
					//				glmprintf((0,"ogl_cache_level_textures seg %i side %i t1 %i t2 %x bm %p NT %i\n",seg,side,tmap1,tmap2,bm,NumTextures));
				}
				ogl_loadbmtexture(bm);
			}
		}
		glmprintf((0,"finished ef:%i\n",ef));
	}
	reset_special_effects();
	init_special_effects();
	{
//		int laserlev=1;
		//always have lasers and concs
		ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[LASER_INDEX]]);
		ogl_cache_weapon_textures(&Weapon_info[Secondary_weapon_to_weapon_info[CONCUSSION_INDEX]]);
		for (i=0;i<Highest_object_index;i++){
			if(Objects[i].render_type==RT_POWERUP){
				ogl_cache_vclipn_textures(Objects[i].rtype.vclip_info.vclip_num);
				switch (Objects[i].id){
/*					case POW_LASER:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[LASER_INDEX]]);
//						if (laserlev<4)
//							laserlev++;
						break;*/
					case POW_VULCAN_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[VULCAN_INDEX]]);
						break;
					case POW_SPREADFIRE_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[SPREADFIRE_INDEX]]);
						break;
					case POW_PLASMA_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[PLASMA_INDEX]]);
						break;
					case POW_FUSION_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[FUSION_INDEX]]);
						break;
/*					case POW_MISSILE_1:
					case POW_MISSILE_4:
						ogl_cache_weapon_textures(&Weapon_info[Secondary_weapon_to_weapon_info[CONCUSSION_INDEX]]);
						break;*/
					case POW_PROXIMITY_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Secondary_weapon_to_weapon_info[PROXIMITY_INDEX]]);
						break;
					case POW_HOMING_AMMO_1:
					case POW_HOMING_AMMO_4:
						ogl_cache_weapon_textures(&Weapon_info[Primary_weapon_to_weapon_info[HOMING_INDEX]]);
						break;
					case POW_SMARTBOMB_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Secondary_weapon_to_weapon_info[SMART_INDEX]]);
						break;
					case POW_MEGA_WEAPON:
						ogl_cache_weapon_textures(&Weapon_info[Secondary_weapon_to_weapon_info[MEGA_INDEX]]);
						break;
				}
			}
			else if(Objects[i].render_type==RT_POLYOBJ){
				ogl_cache_polymodel_textures(Objects[i].rtype.pobj_info.model_num);
			}
		}
	}
	glmprintf((0,"finished caching\n"));
}

int r_polyc,r_tpolyc,r_bitmapc,r_ubitmapc,r_ubitbltc,r_upixelc;
int r_texcount=0;
#define f2glf(x) (f2fl(x))

bool g3_draw_line(g3s_point *p0,g3s_point *p1)
{
	int c;
	c=grd_curcanv->cv_color;
	OGL_DISABLE(TEXTURE_2D);
	glLineWidth(grd_curscreen->sc_w/640);
	glColor3f(PAL2Tr(c),PAL2Tg(c),PAL2Tb(c));
	glBegin(GL_LINES);
	glVertex3f(f2glf(p0->p3_vec.x),f2glf(p0->p3_vec.y),-f2glf(p0->p3_vec.z));
	glVertex3f(f2glf(p1->p3_vec.x),f2glf(p1->p3_vec.y),-f2glf(p1->p3_vec.z));
	glEnd();
	return 1;
}
void ogl_drawcircle2(int nsides,int type,float xsc,float xo,float ysc,float yo){
	int i;
	float ang;
	glBegin(type);
	for (i=0; i<nsides; i++) {
		ang = 2.0*M_PI*i/nsides;
		glVertex2f(cosf(ang)*xsc+xo,sinf(ang)*ysc+yo);
	}
	glEnd();
}
void ogl_drawcircle(int nsides,int type){
	int i;
	float ang;
	glBegin(type);
	for (i=0; i<nsides; i++) {
		ang = 2.0*M_PI*i/nsides;
		glVertex2f(cosf(ang),sinf(ang));
	}
	glEnd();
}
int circle_list_init(int nsides,int type,int mode) {
	int hand=glGenLists(1);
	glNewList(hand, mode);
	/* draw a unit radius circle in xy plane centered on origin */
	ogl_drawcircle(nsides,type);
	glEndList();
	return hand;
}
float bright_g[4]={	32.0/256,	252.0/256,	32.0/256};
float dark_g[4]={	32.0/256,	148.0/256,	32.0/256};
float darker_g[4]={	32.0/256,	128.0/256,	32.0/256};
void ogl_draw_reticle(int cross,int primary,int secondary){
	float scale=(float)Canvas_height/(float)grd_curscreen->sc_h;
	glPushMatrix();
//	glTranslatef(0.5,0.5,0);
	glTranslatef((grd_curcanv->cv_bitmap.bm_w/2+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,1.0-(grd_curcanv->cv_bitmap.bm_h/2+grd_curcanv->cv_bitmap.bm_y)/(float)last_height,0);
	glScalef(scale/320.0,scale/200.0,scale);//the positions are based upon the standard reticle at 320x200 res.
	
	OGL_DISABLE(TEXTURE_2D);
	glDisable(GL_CULL_FACE);
	if (!cross_lh[cross]){
		cross_lh[cross]=glGenLists(1);
		glNewList(cross_lh[cross], GL_COMPILE_AND_EXECUTE);
		glLineWidth(grd_curscreen->sc_w/640);
		glBegin(GL_LINES);
		//cross top left
		glColor3fv(darker_g);
		glVertex2f(-4.0,4.0);
		if (cross)
			glColor3fv(bright_g);
		else
			glColor3fv(dark_g);
		glVertex2f(-2.0,2.0);

		//cross bottom left
		glColor3fv(dark_g);
		glVertex2f(-3.0,-2.0);
		if (cross)
			glColor3fv(bright_g);
		glVertex2f(-2.0,-1.0);

		//cross top right
		glColor3fv(darker_g);
		glVertex2f(4.0,4.0);
		if (cross)
			glColor3fv(bright_g);
		else
			glColor3fv(dark_g);
		glVertex2f(2.0,2.0);

		//cross bottom right
		glColor3fv(dark_g);
		glVertex2f(3.0,-2.0);
		if (cross)
			glColor3fv(bright_g);
		glVertex2f(2.0,-1.0);

		glEnd();
		glEndList();
	}else
		glCallList(cross_lh[cross]);

//	if (Canvas_height>200)
//		glLineWidth(Canvas_height/(float)200);
	if (!primary_lh[primary]){
		primary_lh[primary]=glGenLists(1);
		glNewList(primary_lh[primary], GL_COMPILE_AND_EXECUTE);

		glColor3fv(dark_g);
		glLineWidth(grd_curscreen->sc_w/640);
		glBegin(GL_LINES);
		//left primary bar
		glVertex2f(-14.0,-8.0);
		glVertex2f(-8.0,-5.0);
		//right primary bar
		glVertex2f(14.0,-8.0);
		glVertex2f(8.0,-5.0);
		glEnd();
		if (primary==0)
			glColor3fv(dark_g);
		else
			glColor3fv(bright_g);
		//left upper
		ogl_drawcircle2(6,GL_POLYGON,1.5,-7.0,1.5,-5.0);
		//right upper
		ogl_drawcircle2(6,GL_POLYGON,1.5,7.0,1.5,-5.0);
		if (primary!=2)
			glColor3fv(dark_g);
		else
			glColor3fv(bright_g);
		//left lower
		ogl_drawcircle2(4,GL_POLYGON,1.0,-14.0,1.0,-8.0);
		//right lower
		ogl_drawcircle2(4,GL_POLYGON,1.0,14.0,1.0,-8.0);

		glEndList();
	}else
		glCallList(primary_lh[primary]);
//	if (Canvas_height>200)
//		glLineWidth(1);

	if (!secondary_lh[secondary]){
		secondary_lh[secondary]=glGenLists(1);
		glNewList(secondary_lh[secondary], GL_COMPILE_AND_EXECUTE);
		if (secondary<=2){
			//left secondary
			if (secondary!=1)
				glColor3fv(darker_g);
			else
				glColor3fv(bright_g);
			ogl_drawcircle2(8,GL_LINE_LOOP,2.0,-10.0,2.0,-1.0);
			//right secondary
			if (secondary!=2)
				glColor3fv(darker_g);
			else
				glColor3fv(bright_g);
			ogl_drawcircle2(8,GL_LINE_LOOP,2.0,10.0,2.0,-1.0);
		}else{
			//bottom/middle secondary
			if (secondary!=4)
				glColor3fv(darker_g);
			else
				glColor3fv(bright_g);
			ogl_drawcircle2(8,GL_LINE_LOOP,2.0,0.0,2.0,-7.0);
		}
		glEndList();
	}else
		glCallList(secondary_lh[secondary]);

	glPopMatrix();
}
int g3_draw_sphere(g3s_point *pnt,fix rad){
	int c;
	c=grd_curcanv->cv_color;
	OGL_DISABLE(TEXTURE_2D);
	glDisable(GL_CULL_FACE); // ZICO - to draw sheres on automap correctly
//	glPointSize(f2glf(rad));
	glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
//	glBegin(GL_POINTS);
//	glVertex3f(f2glf(pnt->p3_vec.x),f2glf(pnt->p3_vec.y),-f2glf(pnt->p3_vec.z));
//	glEnd();
	glPushMatrix();
	glTranslatef(f2glf(pnt->p3_vec.x),f2glf(pnt->p3_vec.y),-f2glf(pnt->p3_vec.z));
	rad/=((float)grd_curcanv->cv_bitmap.bm_w/grd_curcanv->cv_bitmap.bm_h);
	glScalef(f2glf(rad),f2glf(rad*((float)grd_curcanv->cv_bitmap.bm_w/grd_curcanv->cv_bitmap.bm_h)),f2glf(rad));
	if (!sphereh) sphereh=circle_list_init(20,GL_POLYGON,GL_COMPILE_AND_EXECUTE);
	else glCallList(sphereh);
	glPopMatrix();
	return 0;

}
int gr_ucircle(fix xc1,fix yc1,fix r1){//dunno if this really works, radar doesn't seem to.. hm..
	int c;
	c=grd_curcanv->cv_color;
	OGL_DISABLE(TEXTURE_2D);
//	glPointSize(f2glf(rad));
	glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
//	glBegin(GL_POINTS);
//	glVertex3f(f2glf(pnt->p3_vec.x),f2glf(pnt->p3_vec.y),-f2glf(pnt->p3_vec.z));
//	glEnd();
	glPushMatrix();
	glmprintf((0,"circle: %f(%i),%f(%i),%f\n",(f2fl(xc1)+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,f2i(xc1),(f2fl(yc1)+grd_curcanv->cv_bitmap.bm_y)/(float)last_height,f2i(yc1),f2fl(r1)));
	glTranslatef(
			(f2fl(xc1)+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,
			1.0-(f2fl(yc1)+grd_curcanv->cv_bitmap.bm_y)/(float)last_height,0);
	glScalef(f2fl(r1),f2fl(r1),f2fl(r1));
	if (r1<=i2f(5)){
		if (!circleh5) circleh5=circle_list_init(5,GL_LINE_LOOP,GL_COMPILE_AND_EXECUTE);
		else glCallList(circleh5);
	}else{
		if (!circleh10) circleh10=circle_list_init(10,GL_LINE_LOOP,GL_COMPILE_AND_EXECUTE);
		else glCallList(circleh10);
	}
	glPopMatrix();
	return 0;
}
int gr_circle(fix xc1,fix yc1,fix r1){
	return gr_ucircle(xc1,yc1,r1);
}

bool g3_draw_poly(int nv,g3s_point **pointlist)
{
	int c;
	r_polyc++;
	c=grd_curcanv->cv_color;
	OGL_DISABLE(TEXTURE_2D);
	if (Gr_scanline_darkening_level >= GR_FADE_LEVELS) {
		glColor3f(PAL2Tr(c), PAL2Tg(c), PAL2Tb(c));
		glDisable(GL_DEPTH_TEST); // ZICO - disable to show lasers correctly
	}else{
		glColor4f(PAL2Tr(c), PAL2Tg(c), PAL2Tb(c), 1.0 - (float)Gr_scanline_darkening_level / ((float)GR_FADE_LEVELS - 1.0));
	}
	glBegin(GL_TRIANGLE_FAN);
	for (c=0;c<nv;c++){
		glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),-f2glf(pointlist[c]->p3_vec.z));
	}
	glEnd();
	glEnable(GL_DEPTH_TEST); // ZICO - enable it again to stay correct
	return 0;
}

void gr_upoly_tmap(int nverts, int *vert ){
		mprintf((0,"gr_upoly_tmap: unhandled\n"));//should never get called
}
void draw_tmap_flat(grs_bitmap *bm,int nv,g3s_point **vertlist){
		mprintf((0,"draw_tmap_flat: unhandled\n"));//should never get called
}
extern void (*tmap_drawer_ptr)(grs_bitmap *bm,int nv,g3s_point **vertlist);
bool g3_draw_tmap(int nv,g3s_point **pointlist,g3s_uvl *uvl_list,grs_bitmap *bm)
{
	int c;
	float l;
	if (tmap_drawer_ptr==draw_tmap_flat){
		OGL_DISABLE(TEXTURE_2D);
		glColor4f(0,0,0,1.0-(Gr_scanline_darkening_level/(float)NUM_LIGHTING_LEVELS));
		glBegin(GL_TRIANGLE_FAN);
		for (c=0;c<nv;c++){
			glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),-f2glf(pointlist[c]->p3_vec.z));
		}
		glEnd();
	}else if (tmap_drawer_ptr==draw_tmap){
		r_tpolyc++;
		OGL_ENABLE(TEXTURE_2D);
		ogl_bindbmtex(bm);
		ogl_texwrap(bm->gltexture,GL_REPEAT);
		glBegin(GL_TRIANGLE_FAN);
		for (c=0;c<nv;c++){
			if (bm->bm_flags&BM_FLAG_NO_LIGHTING){
				l=1.0;
			}else{
				l=f2fl(uvl_list[c].l);
			}
			glColor3f(l,l,l);
			glTexCoord2f(f2glf(uvl_list[c].u),f2glf(uvl_list[c].v));
			glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),-f2glf(pointlist[c]->p3_vec.z));
		}
		glEnd();
	}else{
		mprintf((0,"g3_draw_tmap: unhandled tmap_drawer %p\n",tmap_drawer_ptr));
	}
	if (!bNoDepthTest)
		glEnable(GL_DEPTH_TEST); // ZICO - we need this so we do not run into any problems if lasers or sprites show up

	return 0;
}
bool g3_draw_tmap_2(int nv,g3s_point **pointlist,g3s_uvl *uvl_list,grs_bitmap *bmbot,grs_bitmap *bm,int orient)
{
#if (defined(GL_ARB_multitexture) || defined(GL_SGIS_multitexture))
	if (ogl_arb_multitexture_ok || ogl_sgis_multitexture_ok){
		int c;
		float l,u1,v1;

		r_tpolyc+=2;
		/*	if (bm->bm_w !=64||bm->bm_h!=64)
			printf("g3_draw_tmap w %i h %i\n",bm->bm_w,bm->bm_h);*/
		if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
			glActiveTextureARB(GL_TEXTURE0_ARB);
#endif
		}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
			glSelectTextureSGIS(GL_TEXTURE0_SGIS);
#endif
		}
		ogl_bindbmtex(bmbot);
		OGL_ENABLE(TEXTURE_2D);
		glEnable(GL_TEXTURE_2D);
		ogl_texwrap(bmbot->gltexture,GL_REPEAT);
		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

		if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
			glActiveTextureARB(GL_TEXTURE1_ARB);
#endif
		}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
			glSelectTextureSGIS(GL_TEXTURE1_SGIS);
#endif
		}
		ogl_bindbmtex(bm);
//		OGL_ENABLE(TEXTURE_2D);
		glEnable(GL_TEXTURE_2D);
		ogl_texwrap(bm->gltexture,GL_REPEAT);
		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

		glBegin(GL_TRIANGLE_FAN);
		for (c=0;c<nv;c++){
			switch(orient){
				case 1:
					u1=1.0-f2glf(uvl_list[c].v);
					v1=f2glf(uvl_list[c].u);
					break;
				case 2:
					u1=1.0-f2glf(uvl_list[c].u);
					v1=1.0-f2glf(uvl_list[c].v);
					break;
				case 3:
					u1=f2glf(uvl_list[c].v);
					v1=1.0-f2glf(uvl_list[c].u);
					break;
				default:
					u1=f2glf(uvl_list[c].u);
					v1=f2glf(uvl_list[c].v);
					break;
			}
			if (bm->bm_flags&BM_FLAG_NO_LIGHTING){
				l=1.0;
			}else{
				//l=f2fl(uvl_list[c].l)+gr_palette_gamma/63.0;
				l=f2fl(uvl_list[c].l);
			}
			glColor3f(l,l,l);
//			glTexCoord2f(f2glf(uvl_list[c].u),f2glf(uvl_list[c].v));
			if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
				glMultiTexCoord2fARB(GL_TEXTURE0_ARB,f2glf(uvl_list[c].u),f2glf(uvl_list[c].v));
#endif
			}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
				glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS,f2glf(uvl_list[c].u),f2glf(uvl_list[c].v));
#endif
			}
			if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
				glMultiTexCoord2fARB(GL_TEXTURE1_ARB,u1,v1);
#endif
			}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
				glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS,u1,v1);
#endif
			}
			//glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),f2glf(pointlist[c]->p3_vec.z));
			//glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),f2glf(pointlist[c]->p3_vec.z));
			glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),-f2glf(pointlist[c]->p3_vec.z));
		}
		glEnd();
/*		if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
			glActiveTextureARB(GL_TEXTURE1_ARB);
#endif
		}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
			glSelectTextureSGIS(GL_TEXTURE1_SGIS);
#endif
		}
//		OGL_ENABLE(TEXTURE_2D);*/
		glDisable(GL_TEXTURE_2D);
		if (ogl_arb_multitexture_ok){
#ifdef GL_ARB_multitexture
			glActiveTextureARB(GL_TEXTURE0_ARB);
#endif
		}else if (ogl_sgis_multitexture_ok){
#ifdef GL_SGIS_multitexture
			glSelectTextureSGIS(GL_TEXTURE0_SGIS);
#endif
		}
	}else
#endif
	{
		int c;
		float l,u1,v1;

		g3_draw_tmap(nv,pointlist,uvl_list,bmbot);//draw the bottom texture first.. could be optimized with multitexturing..

		r_tpolyc++;
		/*	if (bm->bm_w !=64||bm->bm_h!=64)
			printf("g3_draw_tmap w %i h %i\n",bm->bm_w,bm->bm_h);*/
		OGL_ENABLE(TEXTURE_2D);
		ogl_bindbmtex(bm);
		ogl_texwrap(bm->gltexture,GL_REPEAT);
		glBegin(GL_TRIANGLE_FAN);
		for (c=0;c<nv;c++){
			switch(orient){
				case 1:
					u1=1.0-f2glf(uvl_list[c].v);
					v1=f2glf(uvl_list[c].u);
					break;
				case 2:
					u1=1.0-f2glf(uvl_list[c].u);
					v1=1.0-f2glf(uvl_list[c].v);
					break;
				case 3:
					u1=f2glf(uvl_list[c].v);
					v1=1.0-f2glf(uvl_list[c].u);
					break;
				default:
					u1=f2glf(uvl_list[c].u);
					v1=f2glf(uvl_list[c].v);
					break;
			}
			if (bm->bm_flags&BM_FLAG_NO_LIGHTING){
				l=1.0;
			}else{
				//l=f2fl(uvl_list[c].l)+gr_palette_gamma/63.0;
				l=f2fl(uvl_list[c].l);
			}
			glColor3f(l,l,l);
			glTexCoord2f(u1,v1);
			//glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),f2glf(pointlist[c]->p3_vec.z));
			//glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),f2glf(pointlist[c]->p3_vec.z));
			glVertex3f(f2glf(pointlist[c]->p3_vec.x),f2glf(pointlist[c]->p3_vec.y),-f2glf(pointlist[c]->p3_vec.z));
		}
		glEnd();
	}
	return 0;
}

bool g3_draw_bitmap(vms_vector *pos,fix width,fix height,grs_bitmap *bm,object *obj)
{
	vms_vector pv,v1;
	int i;
	r_bitmapc++;
	v1.z=0;

	OGL_ENABLE(TEXTURE_2D);
	ogl_bindbmtex(bm);
	ogl_texwrap(bm->gltexture,GL_CLAMP);

	glDisable(GL_DEPTH_TEST); // ZICO - disable to prevent sprites get cutted by polygons

	glBegin(GL_QUADS);
	// Define alpha by looking for object TYPE or ID. We do this here so we have it seperated from the rest of the code.
	if (glalpha_effects && (obj->type==OBJ_FIREBALL || obj->type==OBJ_WEAPON || obj->id==POW_EXTRA_LIFE || obj->id==POW_ENERGY || obj->id==POW_SHIELD_BOOST || obj->id==POW_CLOAK || obj->id==POW_INVULNERABILITY))
		glColor4f(1.0,1.0,1.0,0.6);
	else
		glColor3f(1.0,1.0,1.0);
	width = fixmul(width,Matrix_scale.x);	
	height = fixmul(height,Matrix_scale.y);	
	for (i=0;i<4;i++){
		vm_vec_sub(&v1,pos,&View_position);
		vm_vec_rotate(&pv,&v1,&View_matrix);
		switch (i){
			case 0:
				glTexCoord2f(0.0, 0.0);
				pv.x+=-width;
				pv.y+=height;
				break;
			case 1:
				glTexCoord2f(bm->gltexture->u, 0.0);
				pv.x+=width;
				pv.y+=height;
				break;
			case 2:
				glTexCoord2f(bm->gltexture->u, bm->gltexture->v);
				pv.x+=width;
				pv.y+=-height;
				break;
			case 3:
				glTexCoord2f(0.0, bm->gltexture->v);
				pv.x+=-width;
				pv.y+=-height;
				break;
		}
		glVertex3f(f2glf(pv.x),f2glf(pv.y),-f2glf(pv.z));
	}
	glEnd();
	if (!bNoDepthTest) // ZICO - need this for escape seq
		glEnable(GL_DEPTH_TEST);
	return 0;
}
bool ogl_ubitmapm_c(int x, int y,grs_bitmap *bm,int c)
{
	GLfloat xo,yo,xf,yf;
	GLfloat u1,u2,v1,v2;
	r_ubitmapc++;
	x+=grd_curcanv->cv_bitmap.bm_x;
	y+=grd_curcanv->cv_bitmap.bm_y;
	xo=x/(float)last_width;
	xf=(bm->bm_w+x)/(float)last_width;
	yo=1.0-y/(float)last_height;
	yf=1.0-(bm->bm_h+y)/(float)last_height;

//	printf("g3_draw_bitmap: %f,%f,%f - ",f2glf(pos->x),f2glf(pos->y),-f2glf(pos->z));
//	printf("(%f,%f,%f) ",f2glf(View_position.x),f2glf(View_position.y),-f2glf(View_position.z));

/*		glEnABLE(ALPHA_TEST);
	glAlphaFunc(GL_GREATER,0.0);*/

	OGL_ENABLE(TEXTURE_2D);
	ogl_bindbmtex(bm);
	ogl_texwrap(bm->gltexture,GL_CLAMP);
	
	if (bm->bm_x==0){
		u1=0;
		if (bm->bm_w==bm->gltexture->w)
			u2=bm->gltexture->u;
		else
			u2=(bm->bm_w+bm->bm_x)/(float)bm->gltexture->tw;
	}else {
		u1=bm->bm_x/(float)bm->gltexture->tw;
		u2=(bm->bm_w+bm->bm_x)/(float)bm->gltexture->tw;
	}
	if (bm->bm_y==0){
		v1=0;
		if (bm->bm_h==bm->gltexture->h)
			v2=bm->gltexture->v;
		else
			v2=(bm->bm_h+bm->bm_y)/(float)bm->gltexture->th;
	}else{
		v1=bm->bm_y/(float)bm->gltexture->th;
		v2=(bm->bm_h+bm->bm_y)/(float)bm->gltexture->th;
	}

	glBegin(GL_QUADS);
	if (c<0)
		glColor3f(1.0,1.0,1.0);
	else
		glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
	glTexCoord2f(u1, v1); glVertex2f(xo, yo);
	glTexCoord2f(u2, v1); glVertex2f(xf, yo);
	glTexCoord2f(u2, v2); glVertex2f(xf, yf);
	glTexCoord2f(u1, v2); glVertex2f(xo, yf);
	glEnd();
//	glDisABLE(ALPHA_TEST);
	
	return 0;
}
bool ogl_ubitmapm(int x, int y,grs_bitmap *bm){
	return ogl_ubitmapm_c(x,y,bm,-1);
//	return ogl_ubitblt(bm->bm_w,bm->bm_h,x,y,0,0,bm,NULL);
}
#if 0
//also upsidedown, currently.
bool ogl_ubitblt(int w,int h,int dx,int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
{
	GLfloat xo,yo;//,xs,ys;
	glmprintf((0,"ogl_ubitblt(w=%i,h=%i,dx=%i,dy=%i,sx=%i,sy=%i,src=%p,dest=%p\n",w,h, dx, dy,sx, sy,  src,dest));
	
	dx+=dest->bm_x;
	dy+=dest->bm_y;
	
	xo=dx/(float)last_width;
//	xo=dx/(float)grd_curscreen->sc_w;
//	xs=w/(float)last_width;
	//yo=1.0-dy/(float)last_height;
	yo=1.0-(dy+h)/(float)last_height;
//	ys=h/(float)last_height;
	
//	OGL_ENABLE(TEXTURE_2D);
	
	OGL_DISABLE(TEXTURE_2D);
	glRasterPos2f(xo,yo);
	ogl_filltexbuf(src->bm_data,texbuf,src->bm_w,w,h,sx,sy,w,h,GL_RGBA);
	glDrawPixels(w,h,GL_RGBA,GL_UNSIGNED_BYTE,texbuf);
	glRasterPos2f(0,0);
	
	return 0;
}
#else
bool ogl_ubitblt_i(int dw,int dh,int dx,int dy, int sw, int sh, int sx, int sy, grs_bitmap * src, grs_bitmap * dest, int transp)
{
	GLfloat xo,yo,xs,ys;
	GLfloat u1,v1;//,u2,v2;
	ogl_texture tex;
//	unsigned char *oldpal;
	r_ubitbltc++;

	ogl_init_texture(&tex);
	tex.w=sw;tex.h=sh;
	tex.prio=0.0;tex.wantmip=0;
	tex.lw=src->bm_rowsize;

/*	if (w==src->bm_w && sx==0){
		u1=0;u2=src->glu;
	}else{
		u1=sx/(float)src->bm_w*src->glu;
		u2=w/(float)src->bm_w*src->glu+u1;
	}
	if (h==src->bm_h && sy==0){
		v1=0;v2=src->glv;
	}else{
		v1=sy/(float)src->bm_h*src->glv;
		v2=h/(float)src->bm_h*src->glv+v1;
	}*/
	u1=v1=0;
	
	dx+=dest->bm_x;
	dy+=dest->bm_y;
	xo=dx/(float)last_width;
	xs=dw/(float)last_width;
	yo=1.0-dy/(float)last_height;
	ys=dh/(float)last_height;
	
	OGL_ENABLE(TEXTURE_2D);
	
//	oldpal=ogl_pal;
	ogl_pal=gr_current_pal;
	ogl_loadtexture(src->bm_data,sx,sy,&tex,transp);
//	ogl_pal=oldpal;
	ogl_pal=gr_palette;
	OGL_BINDTEXTURE(tex.handle);
	
	ogl_texwrap(&tex,GL_CLAMP);

	glBegin(GL_QUADS);
	glColor3f(1.0,1.0,1.0);
	glTexCoord2f(u1, v1); glVertex2f(xo, yo);
	glTexCoord2f(tex.u, v1); glVertex2f(xo+xs, yo);
	glTexCoord2f(tex.u, tex.v); glVertex2f(xo+xs, yo-ys);
	glTexCoord2f(u1, tex.v); glVertex2f(xo, yo-ys);
	glEnd();
	ogl_freetexture(&tex);
	return 0;
}
bool ogl_ubitblt(int w,int h,int dx,int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest){
	return ogl_ubitblt_i(w,h,dx,dy,w,h,sx,sy,src,dest,0);
}
#endif
bool ogl_ubitblt_tolinear(int w,int h,int dx,int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest){
#if 1
	unsigned char *d,*s;
	int i,j;
	int w1,h1;
//	w1=w;h1=h;
	w1=grd_curscreen->sc_w;h1=grd_curscreen->sc_h;
// 	if (w1*h1*3>OGLTEXBUFSIZE)
// 		Error("ogl_ubitblt_tolinear: screen res larger than OGLTEXBUFSIZE\n");

	if (ogl_readpixels_ok>0){
		OGL_DISABLE(TEXTURE_2D);
		glReadBuffer(GL_FRONT);
		glReadPixels(0,0,w1,h1,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
//		glReadPixels(sx,grd_curscreen->sc_h-(sy+h),w,h,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
//		glReadPixels(sx,sy,w+sx,h+sy,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
	}else
		memset(texbuf,0,w1*h1*3);
	sx+=src->bm_x;
	sy+=src->bm_y;
	for (i=0;i<h;i++){
		d=dest->bm_data+dx+(dy+i)*dest->bm_rowsize;
		s=texbuf+((h1-(i+sy+1))*w1+sx)*3;
		for (j=0;j<w;j++){
			*d=gr_find_closest_color(s[0]/4,s[1]/4,s[2]/4);
			s+=3;
			d++;
		}
	}
#else
	int i,j,c=0;
	unsigned char *d,*s,*e;
	if (w*h*3>OGLTEXBUFSIZE)
		Error("ogl_ubitblt_tolinear: size larger than OGLTEXBUFSIZE\n");
	sx+=src->bm_x;
	sy+=src->bm_y;
#if 1//also seems to cause a mess.  need to look into it a bit more..
	if (ogl_readpixels_ok>0){
		OGL_DISABLE(TEXTURE_2D);
		glReadBuffer(GL_FRONT);
//		glReadPixels(0,0,w,h,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
		glReadPixels(sx,grd_curscreen->sc_h-(sy+h),w,h,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
	}else
#endif
		memset(texbuf,0,w*h*3);
//	d=dest->bm_data+dx+(dy+i)*dest->bm_rowsize;
	d=dest->bm_data+dx+dy*dest->bm_rowsize;
	for (i=0;i<h;i++){
		s=texbuf+w*(h-(i+1))*3;
//		s=texbuf+w*i*3;
		if (s<texbuf){Error("blah1\n");}
		if (d<dest->bm_data){Error("blah3\n");}
//		d=dest->bm_data+(i*dest->bm_rowsize);

		e=d;
		for (j=0;j<w;j++){
			if (s>texbuf+w*h*3-3){Error("blah2\n");}
			if (d>dest->bm_data+dest->bm_rowsize*(h+dy)+dx	){Error("blah4\n");}
			*d=gr_find_closest_color(s[0]/4,s[1]/4,s[2]/4);
			s+=3;
			d++;
			c++;
		}
		d=e;
		d+=dest->bm_rowsize;
	}
	glmprintf((0,"c=%i w*h=%i\n",c,w*h));
#endif
	return 0;
}

bool ogl_ubitblt_copy(int w,int h,int dx,int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest){
#if 0 //just seems to cause a mess.
	GLfloat xo,yo;//,xs,ys;
	
	dx+=dest->bm_x;
	dy+=dest->bm_y;
	
//	xo=dx/(float)last_width;
	xo=dx/(float)grd_curscreen->sc_w;
//	yo=1.0-(dy+h)/(float)last_height;
	yo=1.0-(dy+h)/(float)grd_curscreen->sc_h;
	sx+=src->bm_x;
	sy+=src->bm_y;
	OGL_DISABLE(TEXTURE_2D);
	glReadBuffer(GL_FRONT);
	glRasterPos2f(xo,yo);
//	glReadPixels(0,0,w,h,GL_RGB,GL_UNSIGNED_BYTE,texbuf);
	glCopyPixels(sx,grd_curscreen->sc_h-(sy+h),w,h,GL_COLOR);
	glRasterPos2f(0,0);
#endif
	return 0;
}

grs_canvas *offscreen_save_canv = NULL, *offscreen_canv = NULL;
// float pixels [OGLTEXBUFSIZE];
GLubyte *pixels = NULL;

void ogl_start_offscreen_render(int x, int y, int w, int h) {
	int y2;

	if (offscreen_canv) Error("ogl_start_offscreen_render: offscreen_canv!=NULL");
	offscreen_save_canv = grd_curcanv;
	glDrawBuffer(GL_BACK);
	offscreen_canv = gr_create_sub_canvas(grd_curcanv, x, y, w, h);
	gr_set_current_canvas(offscreen_canv);
	y2 = last_height - offscreen_canv->cv_bitmap.bm_y - offscreen_canv->cv_bitmap.bm_h;
	glReadPixels(offscreen_canv->cv_bitmap.bm_x,y2,w,h,GL_RGBA,GL_UNSIGNED_BYTE,pixels);
}
void ogl_end_offscreen_render(void) {
	int y;

	if (!offscreen_canv) Error("ogl_end_offscreen_render: no offscreen_canv");
	glDrawBuffer(GL_FRONT);
	glReadBuffer(GL_BACK);
	OGL_DISABLE(TEXTURE_2D);
	y = last_height - offscreen_canv->cv_bitmap.bm_y - offscreen_canv->cv_bitmap.bm_h;
	glRasterPos2f(offscreen_canv->cv_bitmap.bm_x/(float)last_width, y/(float)last_height);
	glDrawPixels(offscreen_canv->cv_bitmap.bm_w, offscreen_canv->cv_bitmap.bm_h,GL_RGBA,GL_UNSIGNED_BYTE,pixels);
	gr_free_sub_canvas(offscreen_canv);
	gr_set_current_canvas(offscreen_save_canv);
	offscreen_canv=NULL;
}

void ogl_start_frame(void){
	r_polyc=0;r_tpolyc=0;r_bitmapc=0;r_ubitmapc=0;r_ubitbltc=0;r_upixelc=0;

	OGL_VIEWPORT(grd_curcanv->cv_bitmap.bm_x,grd_curcanv->cv_bitmap.bm_y,Canvas_width,Canvas_height);
	glClearColor(0.0, 0.0, 0.0, 0.0);

	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	glEnable(GL_ALPHA_TEST);
	glAlphaFunc(GL_GEQUAL,0.02);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);

	glClear(GL_DEPTH_BUFFER_BIT);
	glEnable(GL_CULL_FACE);
	glCullFace(GL_FRONT);

	glShadeModel(GL_SMOOTH);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();//clear matrix
	gluPerspective(90.0,1.0,0.01,1000000.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();//clear matrix
// 	printf("bNoDepthTest: %i\n", bNoDepthTest);
}

#ifndef NMONO
void merge_textures_stats(void);
#endif
void ogl_end_frame(void){
	OGL_VIEWPORT(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();//clear matrix
	glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();//clear matrix
	glDisable(GL_CULL_FACE);
	glDisable(GL_DEPTH_TEST);
}
void ogl_swap_buffers(void){
	ogl_clean_texture_cache();
	if (gr_renderstats){
		gr_printf(5,FONTSCALE_Y(GAME_FONT->ft_h*13+3*13),"%i flat %i tex %i sprites %i bitmaps",r_polyc,r_tpolyc,r_bitmapc,r_ubitmapc);
//	glmprintf((0,"ogl_end_frame: %i polys, %i tmaps, %i sprites, %i bitmaps, %i bitblts, %i pixels\n",r_polyc,r_tpolyc,r_bitmapc,r_ubitmapc,r_ubitbltc,r_upixelc));//we need to do it here because some things get drawn after end_frame
	}
	ogl_do_palfx();
	ogl_swap_buffers_internal();
	glClear(GL_COLOR_BUFFER_BIT);
}

int tex_format_supported(int iformat,int format){
	switch (iformat){
		case GL_INTENSITY4:
			if (!ogl_intensity4_ok) return 0; break;
		case GL_LUMINANCE4_ALPHA4:
			if (!ogl_luminance4_alpha4_ok) return 0; break;
		case GL_RGBA2:
			if (!ogl_rgba2_ok) return 0; break;
	}
	if (ogl_gettexlevelparam_ok){
		int internalFormat;
		glTexImage2D(GL_PROXY_TEXTURE_2D, 0, iformat, 64, 64, 0,
				format, GL_UNSIGNED_BYTE, texbuf);//NULL?
		glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
				GL_TEXTURE_INTERNAL_FORMAT,
				&internalFormat);
		return (internalFormat==iformat);
	}else
		return 1;
}

//little hack to find the nearest bigger power of 2 for a given number
int pow2ize(int x){
	int i;
	for (i=2; i<x; i*=2) {}; //corrected by MD2211: was previously limited to 4096
	return i;
}
// 
//GLubyte texbuf[512*512*4];
//GLubyte texbuf[OGLTEXBUFSIZE];
GLubyte *texbuf = NULL;

// Allocate the pixel buffers 'pixels' and 'texbuf' based on current screen resolution
void ogl_init_pixel_buffers(int w, int h)
{
	w = pow2ize(w); // convert to OpenGL texture size
	h = pow2ize(h);

	if (pixels)
		free(pixels);
	pixels = malloc(w*h*4);

	if (texbuf)
		free(texbuf);
	texbuf = malloc(max(w, 1024)*max(h, 256)*4);  // must also fit big font texture

	if ((pixels == NULL) || (texbuf == NULL))
		Error("Not enough memory for current resolution");
}

void ogl_close_pixel_buffers(void)
{
	free(pixels);
	free(texbuf);
}


void ogl_filltexbuf(unsigned char *data,GLubyte *texp,int truewidth,int width,int height,int dxo,int dyo,int twidth,int theight,int type,int transp)
{
//	GLushort *tex=(GLushort *)texp;
	int x,y,c,i;
// 	if (twidth*theight*4>sizeof(texbuf))//shouldn't happen, descent never uses textures that big.
	if ((width > max(grd_curscreen->sc_w, 1024)) || (height > max(grd_curscreen->sc_h, 256)))
		Error("texture toobig %i %i",twidth,theight);

	i=0;
	for (y=0;y<theight;y++){
		i=dxo+truewidth*(y+dyo);
		for (x=0;x<twidth;x++){
			if (x<width && y<height)
				c=data[i++];
			else
				c=255;//fill the pad space with transparancy
			if (c==255 && transp){
				switch (type){
					case GL_LUMINANCE:
						(*(texp++))=0;
						break;
					case GL_LUMINANCE_ALPHA:
						(*(texp++))=0;
						(*(texp++))=0;
						break;
					case GL_RGBA:
						(*(texp++))=0;
						(*(texp++))=0;
						(*(texp++))=0;
						(*(texp++))=0;//transparent pixel
						break;
				}
//				(*(tex++))=0;
			}else{
				switch (type){
					case GL_LUMINANCE://these could prolly be done to make the intensity based upon the intensity of the resulting color, but its not needed for anything (yet?) so no point. :)
						(*(texp++))=255;
						break;
					case GL_LUMINANCE_ALPHA:
						(*(texp++))=255;
						(*(texp++))=255;
						break;
					case GL_RGBA:
						//(*(texp++))=gr_palette[c*3]*4;
						//(*(texp++))=gr_palette[c*3+1]*4;
						//(*(texp++))=gr_palette[c*3+2]*4;
						(*(texp++))=ogl_pal[c*3]*4;
						(*(texp++))=ogl_pal[c*3+1]*4;
						(*(texp++))=ogl_pal[c*3+2]*4;
						(*(texp++))=255;//not transparent
						//				(*(tex++))=(ogl_pal[c*3]>>1) + ((ogl_pal[c*3+1]>>1)<<5) + ((ogl_pal[c*3+2]>>1)<<10) + (1<<15);
						break;
				}
			}
		}
	}
}
int tex_format_verify(ogl_texture *tex){
	while (!tex_format_supported(tex->internalformat,tex->format)){
		glmprintf((0,"tex format %x not supported",tex->internalformat));
		switch (tex->internalformat){
			case GL_INTENSITY4:
				if (ogl_luminance4_alpha4_ok){
					tex->internalformat=GL_LUMINANCE4_ALPHA4;
					tex->format=GL_LUMINANCE_ALPHA;
					break;
				}//note how it will fall through here if the statement is false
			case GL_LUMINANCE4_ALPHA4:
				if (ogl_rgba2_ok){
					tex->internalformat=GL_RGBA2;
					tex->format=GL_RGBA;
					break;
				}//note how it will fall through here if the statement is false
			case GL_RGBA2:
				tex->internalformat=ogl_rgba_format;
				tex->format=GL_RGBA;
				break;
			default:
				mprintf((0,"...no tex format to fall back on\n"));
				return 1;
		}
		glmprintf((0,"...falling back to %x\n",tex->internalformat));
	}
	return 0;
}
void tex_set_size1(ogl_texture *tex,int dbits,int bits,int w, int h){
	int u;
	if (tex->tw!=w || tex->th!=h){
		u=(tex->w/(float)tex->tw*w) * (tex->h/(float)tex->th*h);
		glmprintf((0,"shrunken texture?\n"));
	}else
		u=tex->w*tex->h;
	if (bits<=0){//the beta nvidia GLX server. doesn't ever return any bit sizes, so just use some assumptions.
		tex->bytes=((float)w*h*dbits)/8.0;
		tex->bytesu=((float)u*dbits)/8.0;
	}else{
		tex->bytes=((float)w*h*bits)/8.0;
		tex->bytesu=((float)u*bits)/8.0;
	}
	glmprintf((0,"tex_set_size1: %ix%i, %ib(%i) %iB\n",w,h,bits,dbits,tex->bytes));
}
void tex_set_size(ogl_texture *tex){
	int w,h,bi=16,a=0;
	if (ogl_gettexlevelparam_ok){
		int t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_WIDTH,&w);
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_HEIGHT,&h);
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_LUMINANCE_SIZE,&t);a+=t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_INTENSITY_SIZE,&t);a+=t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_RED_SIZE,&t);a+=t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_GREEN_SIZE,&t);a+=t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_BLUE_SIZE,&t);a+=t;
		glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_ALPHA_SIZE,&t);a+=t;
	}else{
		w=tex->tw;
		h=tex->th;
	}
	switch (tex->format){
		case GL_LUMINANCE:
			bi=8;
			break;
		case GL_LUMINANCE_ALPHA:
			bi=8;
			break;
		case GL_RGBA:
			bi=16;
			break;
		default:
			Error("tex_set_size unknown texformat\n");
			break;
	}
	tex_set_size1(tex,bi,a,w,h);
}
//loads a palettized bitmap into a ogl RGBA texture.
//Sizes and pads dimensions to multiples of 2 if necessary.
//In theory this could be a problem for repeating textures, but all real
//textures (not sprites, etc) in descent are 64x64, so we are ok.
//stores OpenGL textured id in *texid and u/v values required to get only the real data in *u/*v
int ogl_loadtexture(unsigned char * data, int dxo,int dyo, ogl_texture *tex, int transp){
//void ogl_loadtexture(unsigned char * data, int width, int height,int dxo,int dyo, int *texid,float *u,float *v,char domipmap,float prio){
//	int internalformat=GL_RGBA;
//	int format=GL_RGBA;
	//int filltype=0;
	tex->tw=pow2ize(tex->w);tex->th=pow2ize(tex->h);//calculate smallest texture size that can accomodate us (must be multiples of 2)
//	tex->tw=tex->w;tex->th=tex->h;//feeling lucky?
	
	if(gr_badtexture>0) return 1;

	if (tex_format_verify(tex))
		return 1;
	
	//calculate u/v values that would make the resulting texture correctly sized
	tex->u=(float)tex->w/(float)tex->tw;
	tex->v=(float)tex->h/(float)tex->th;

	//	if (width!=twidth || height!=theight)
	//		glmprintf((0,"sizing %ix%i texture up to %ix%i\n",width,height,twidth,theight));
	ogl_filltexbuf(data,texbuf,tex->lw,tex->w,tex->h,dxo,dyo,tex->tw,tex->th,tex->format,transp);

	// Generate OpenGL texture IDs.
	glGenTextures(1, &tex->handle);

	//set priority
	glPrioritizeTextures(1,&tex->handle,&tex->prio);
	
	// Give our data to OpenGL.

	OGL_BINDTEXTURE(tex->handle);

	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	if (tex->wantmip){
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_texmagfilt);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_texminfilt);
	}else{
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	}
//	domipmap=0;//mipmaps aren't used in GL_NEAREST anyway, and making the mipmaps is pretty slow
	//however, if texturing mode becomes an ingame option, they would need to be made regardless, so it could switch to them later.  OTOH, texturing mode could just be made a command line arg.

	if (tex->wantmip && GL_needmipmaps)
		gluBuild2DMipmaps( GL_TEXTURE_2D, tex->internalformat, tex->tw,
				tex->th, tex->format, GL_UNSIGNED_BYTE, texbuf);
	else
		glTexImage2D(GL_TEXTURE_2D, 0, tex->internalformat,
			tex->tw, tex->th, 0, tex->format, // RGBA textures.
			GL_UNSIGNED_BYTE, // imageData is a GLubyte pointer.
			texbuf);
	
	tex_set_size(tex);

	r_texcount++; 
	glmprintf((0,"ogl_loadtexture(%p,%i,%i,%ix%i,%p):%i u=%f v=%f b=%i bu=%i (%i)\n",data,tex->tw,tex->th,dxo,dyo,tex,tex->handle,tex->u,tex->v,tex->bytes,tex->bytesu,r_texcount));

	return 0;
}
unsigned char decodebuf[1024*1024];
void ogl_loadbmtexture_m(grs_bitmap *bm,int domipmap){
	unsigned char *buf;
	while (bm->bm_parent)
		bm=bm->bm_parent;
	buf=bm->bm_data;
	if (bm->gltexture==NULL){
		ogl_init_texture(bm->gltexture=ogl_get_free_texture());
		bm->gltexture->lw=bm->bm_w;
		bm->gltexture->w=bm->bm_w;
		bm->gltexture->h=bm->bm_h;
		bm->gltexture->wantmip=domipmap;
	}
	else {
		if (bm->gltexture->handle>0)
			return;
		if (bm->gltexture->w==0){
			bm->gltexture->lw=bm->bm_w;
			bm->gltexture->w=bm->bm_w;
			bm->gltexture->h=bm->bm_h;
		}
	}
	if (bm->bm_flags & BM_FLAG_RLE){
		unsigned char * dbits;
		unsigned char * sbits;
		int i;
		sbits = &bm->bm_data[4 + bm->bm_h];
		dbits = decodebuf;

		for (i=0; i < bm->bm_h; i++ )    {
			gr_rle_decode(sbits,dbits);
			sbits += (int)bm->bm_data[4+i];
			dbits += bm->bm_w;
		}
		buf=decodebuf;
	}
	ogl_loadtexture(buf,0,0,bm->gltexture,1);
}
void ogl_loadbmtexture(grs_bitmap *bm){
	ogl_loadbmtexture_m(bm,1);
}
void ogl_freetexture(ogl_texture *gltexture){
	if (gltexture->handle>0){
		r_texcount--;
		glmprintf((0,"ogl_freetexture(%p):%i (last rend %is) (%i left)\n",gltexture,gltexture->handle,(GameTime-gltexture->lastrend)/f1_0,r_texcount));
		glDeleteTextures( 1, &gltexture->handle );
//		gltexture->handle=0;
		ogl_init_texture(gltexture);
	}
}
void ogl_freebmtexture(grs_bitmap *bm){
	if (bm->gltexture){
		ogl_freetexture(bm->gltexture);
		bm->gltexture=NULL;
//		r_texcount--;
//		glmprintf((0,"ogl_freebmtexture(%p,%p):%i (%i left)\n",bm->bm_data,&bm->gltexture,bm->gltexture,r_texcount));
//		glDeleteTextures( 1, &bm->gltexture );
//		bm->gltexture=-1;
	}
}

bool ogl_ubitmapm_cs(int x, int y,int dw, int dh, grs_bitmap *bm,int c, int scale) // to scale bitmaps
{
	GLfloat xo,yo,xf,yf;
	GLfloat u1,u2,v1,v2;
	GLdouble h,a;
	r_ubitmapc++;
	x+=grd_curcanv->cv_bitmap.bm_x;
	y+=grd_curcanv->cv_bitmap.bm_y;
	xo=x/(float)last_width;
	xf=(bm->bm_w+x)/(float)last_width;
	yo=1.0-y/(float)last_height;
	yf=1.0-(bm->bm_h+y)/(float)last_height;

	if (dw < 0)
		dw = grd_curcanv->cv_bitmap.bm_w;
	else if (dw == 0)
		dw = bm->bm_w;
	if (dh < 0)
		dh = grd_curcanv->cv_bitmap.bm_h;
	else if (dh == 0)
		dh = bm->bm_h;
	r_ubitmapc++;

	a = (double) grd_curscreen->sc_w / (double) grd_curscreen->sc_h;
	h = (double) scale / (double) F1_0;

	xo = x / ((double) last_width * h);
	xf = (dw + x) / ((double) last_width * h);
	yo = 1.0 - y / ((double) last_height * h);
	yf = 1.0 - (dh + y) / ((double) last_height * h);

	OGL_ENABLE(TEXTURE_2D);
	ogl_bindbmtex(bm);
	ogl_texwrap(bm->gltexture,GL_CLAMP);
	
	if (bm->bm_x==0){
		u1=0;
		if (bm->bm_w==bm->gltexture->w)
			u2=bm->gltexture->u;
		else
			u2=(bm->bm_w+bm->bm_x)/(float)bm->gltexture->tw;
	}else {
		u1=bm->bm_x/(float)bm->gltexture->tw;
		u2=(bm->bm_w+bm->bm_x)/(float)bm->gltexture->tw;
	}
	if (bm->bm_y==0){
		v1=0;
		if (bm->bm_h==bm->gltexture->h)
			v2=bm->gltexture->v;
		else
			v2=(bm->bm_h+bm->bm_y)/(float)bm->gltexture->th;
	}else{
		v1=bm->bm_y/(float)bm->gltexture->th;
		v2=(bm->bm_h+bm->bm_y)/(float)bm->gltexture->th;
	}

	glBegin(GL_QUADS);
	if (c<0)
		glColor3f(1.0,1.0,1.0);
	else
	glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
	glTexCoord2f(u1, v1); glVertex2f(xo, yo);
	glTexCoord2f(u2, v1); glVertex2f(xf, yo);
	glTexCoord2f(u2, v2); glVertex2f(xf, yf);
	glTexCoord2f(u1, v2); glVertex2f(xo, yf);
	glEnd();
	
	return 0;
}