"linked portal door"

outTex = outPos.xy / outPos.z;

texture mtlSkin1;
float4x4 matWorldViewProj;
float4x4 matWorldView;
float fAlpha;

sampler imageTex = sampler_state
{
	Texture = <mtlSkin1>;
	MinFilter = Linear;
	MagFilter = Linear;
	MipFilter = Linear;   
	AddressU  = wrap;
	AddressV  = wrap;
};

struct vIn
{
	float4 Pos : POSITION;
};

struct vOut
{
	float4 Pos : POSITION;
	float3 Tex : TEXCOORD0;
};

struct pIn
{
	float3 Tex : TEXCOORD0;
};

vOut pVS (vIn In)
{
	vOut Out = (vOut)0;
	Out.Pos = mul(In.Pos, matWorldViewProj);
	Out.Tex = mul(In.Pos, matWorldView).xyz;
	//
	return(Out);
}

float4 pPS (pIn In) : COLOR
{
	float2 tPos = In.Tex.xy/In.Tex.z;
	//
	tPos.y = 1 - (tPos.y*1.135 + 0.5);
	tPos.x = tPos.x*0.855 + 0.5;
	//
	float4 color = tex2D(imageTex, tPos);
	color.a *= fAlpha;
	//
	return(color);
}

technique portalView
{
	pass one
	{
		VertexShader = compile vs_1_1 pVS();
		PixelShader = compile ps_2_0 pPS();
	}
}

updateView(portalEnt[i].portalView, portalEnt[i].linkedEnt.x, portalEnt[j].ownerEnt.x, portalEnt[i].linkedEnt.pan, portalEnt[j].ownerEnt.pan);

updateView(portalEnt[i].portalView, portalEnt[i].linkedEnt.x, portalEnt[i].ownerEnt.x, portalEnt[i].linkedEnt.pan, portalEnt[i].ownerEnt.pan);

ENTITY* heroEnt;
ENTITY* ghost1Ent;

ENTITY* portal1Ent;
ENTITY* portal2Ent;

void calculatePortal(ENTITY* ent, VECTOR* srcPos, VECTOR* dstPos, ANGLE* srcAng, ANGLE* dstAng){
	
	if(!heroEnt){ return; }
	
	ANGLE tempAng;
	vec_fill(tempAng.pan, 0);
	
	VECTOR tempPos;	
	vec_fill(tempPos.x, 0);
	
	ang_diff(tempAng.pan, dstAng.pan, srcAng.pan);
	vec_set(tempPos.x, srcPos.x);
	vec_sub(tempPos.x, heroEnt.x);
	vec_rotate(tempPos.x, tempAng.pan);
	// vec_inverse(tempPos.x); // uncomment this to mirror player's position at destination portal (comment ang_rotate 180 bellow!)
	vec_add(tempPos.x, dstPos.x);
	
	
	ANGLE temp2Ang, endAng;
	vec_fill(temp2Ang.pan, 0);
	vec_fill(endAng.pan, 0);
	
	ang_diff(temp2Ang.pan, srcAng.pan, heroEnt.pan);
	vec_inverse(temp2Ang.pan);
	ang_rotate(temp2Ang.pan, vector(180, 0, 0));
	vec_set(endAng.pan, dstAng.pan);
	ang_add(endAng.pan, temp2Ang.pan);
	
	
	// if player far away from us:
	if(vec_dist(heroEnt.x, ent.x) > 25){
		if(!is(ent.parent, INVISIBLE)){
			set(ent.parent, INVISIBLE);
		}
	}
	else{
		if(is(ent.parent, INVISIBLE)){
			reset(ent.parent, INVISIBLE);
		}
		
		vec_set(ent.parent.x, tempPos.x);
		vec_set(ent.parent.pan, endAng.pan);
		
		VECTOR tempVec;
		vec_fill(tempVec.x, 0);
		
		vec_set(tempVec.x, vector(2.5, 0, 0));
		vec_rotate(tempVec.x, ent.parent.pan);
		vec_add(tempVec.x, ent.parent.x);
		draw_point3d(tempVec.x, COLOR_RED, 100, 1);
	}
}

void portal1(){
	VECTOR tempVec;
	vec_fill(tempVec.x, 0);
	
	portal1Ent = my;
	
	vec_set(my.scale_x, vector(0.05, 1, 1));
	my.pan += random(360);
	set(my, LIGHT | UNLIT | PASSABLE);
	vec_set(my.blue, COLOR_RED);
	
	my.parent = ent_create(CUBE_MDL, my.x, NULL);
	vec_set(my.parent.scale_x, vector(0.25, 0.25, 0.25));
	set(my.parent, TRANSLUCENT | LIGHT | UNLIT | PASSABLE);
	vec_set(my.parent.blue, COLOR_RED);
	
	while(!portal2Ent){ wait(1); }
	
	while(1){
		
		my.pan += 5 * (key_cul - key_cur) * time_step;
		
		my.x += 5 * (key_t - key_g) * time_step;
		my.y += 5 * (key_f - key_h) * time_step;
		
		vec_set(tempVec.x, vector(5, 0, 0));
		vec_rotate(tempVec.x, my.pan);
		vec_add(tempVec.x, my.x);
		draw_line3d(tempVec.x, NULL, 100); 
		draw_line3d(tempVec.x, COLOR_RED, 100); 
		draw_line3d(my.x, COLOR_RED, 100); 
		draw_point3d(tempVec.x, COLOR_RED, 100, 1);
		
		calculatePortal(my, my.x, portal2Ent.x, my.pan, portal2Ent.pan);
		
		wait(1);
	}
}


void portal2(){
	VECTOR tempVec;
	vec_fill(tempVec.x, 0);
	
	portal2Ent = my;
	
	vec_set(my.scale_x, vector(0.05, 1, 1));
	my.pan += random(360);
	set(my, LIGHT | UNLIT | PASSABLE);
	vec_set(my.blue, COLOR_GREEN);
	
	my.parent = ent_create(CUBE_MDL, my.x, NULL);
	vec_set(my.parent.scale_x, vector(0.25, 0.25, 0.25));
	set(my.parent, TRANSLUCENT | LIGHT | UNLIT | PASSABLE);
	vec_set(my.parent.blue, COLOR_GREEN);
	
	while(!portal1Ent){ wait(1); }
	
	while(1){
		
		my.pan += 5 * (key_cuu - key_cud) * time_step;
		
		my.x += 5 * (key_i - key_k) * time_step;
		my.y += 5 * (key_j - key_l) * time_step;
		
		vec_set(tempVec.x, vector(5, 0, 0));
		vec_rotate(tempVec.x, my.pan);
		vec_add(tempVec.x, my.x);
		draw_line3d(tempVec.x, NULL, 100); 
		draw_line3d(tempVec.x, COLOR_GREEN, 100); 
		draw_line3d(my.x, COLOR_GREEN, 100); 
		draw_point3d(tempVec.x, COLOR_GREEN, 100, 1);
		
		calculatePortal(my, my.x, portal1Ent.x, my.pan, portal1Ent.pan);
		
		wait(1);
	}
}


void main(){
	
	fps_max = 60;
	level_load("");
	
	random_seed(0);
	
	// create portals:	
	ent_create(CUBE_MDL, vector(-25, 25, 0), portal1);	
	ent_create(CUBE_MDL, vector(25, -25, 0), portal2);
	
	VECTOR tempVec;
	vec_fill(tempVec.x, 0);
	
	heroEnt = ent_create(CUBE_MDL, nullvector, NULL);
	vec_set(heroEnt.scale_x, vector(0.25, 0.25, 0.25));
	set(heroEnt, TRANSLUCENT | LIGHT | UNLIT);
	vec_set(heroEnt.blue, COLOR_WHITE);
	c_setminmax(heroEnt);	
	
	sun_light = 0;
	set(camera, ISOMETRIC);
	camera.arc = 10;
	camera.z = 100;
	camera.tilt = -90;
	
	while(1){
		
		DEBUG_VAR(heroEnt.pan, 210);
		DEBUG_VAR(portal1Ent.pan, 250);
		DEBUG_VAR(portal2Ent.pan, 270);
		
		heroEnt.skill1 = 5 * (key_w - key_s) * time_step;
		heroEnt.skill2 = 5 * (key_a - key_d) * time_step;
		heroEnt.pan += 5 * (key_z - key_x) * time_step;
		c_move(heroEnt, nullvector, heroEnt.skill1, IGNORE_PASSABLE | GLIDE);
		
		vec_set(tempVec.x, vector(2.5, 0, 0));
		vec_rotate(tempVec.x, heroEnt.pan);
		vec_add(tempVec.x, heroEnt.x);
		draw_point3d(tempVec.x, COLOR_RED, 100, 1);
		
		draw_text("green and red cubes are 'ghost' players position in the destination portals\nwhite cube is player, and those two red/green lines are portals\nyou can see the way they are facing from the lines comming out of portals\nthe green one is source portal and the other one is destination portal (and visa versa)\nuse cursor keys to rotate the portals use WSAD to move the player around \nand TGFH and IKJL to move portals", 10, 10, COLOR_WHITE);
		
		wait(1);
	}
}

ANGLE angBack;
vec_set ( &angBack, &entPortalA->pan );
vec_inverse ( &angBack );

vec_diff ( &camPortalA->x, &camera->x, &entPortalA->x );
vec_rotate ( &camPortalA->x, &angBack ); 
vec_rotate ( &camPortalA->x, &entPortalB->pan );
vec_add ( &camPortalA->x, &entPortalB->x );

vec_set ( &camPortalA->pan, &camera->pan );
ang_add ( &camPortalA->pan, &angBack );
ang_add ( &camPortalA->pan, &entPortalB->pan );