// 3D STAGE TUTORIAL

// X : horizontal, Y : vertical, Z : depth (close/near)

// Stage script -> Set textures 

#TouhouDanmakufu[Stage]
#Title["3D Stages"]
#Text["Stage script for 3D practice"]
#ScriptVersion[3]
#System["script/KevinSystem/Kevin_System.txt"]

let CSD = GetCurrentScriptDirectory;
let texturefloor = CSD ~ "sprite/dafloorEX.png";
let texturewall = CSD ~ "sprite/damagicwall.png";
let texturefog = CSD ~ "sprite/cardbg4.png";

// REMEMBER : set variable texturefloor as png because my ass internet 
// can't download a simple png

// ------- Function to create one floor piece -------//

/*
SetAngleXYZ?

+ Rotates/flips the 3D sprite around a X, Y, Z axis.
+ Direction is influenced by HOW THE CAMERA IS SET -> Setting the camera 
correctly is important!

X : horizontal
Y : vertical
Z : depth

*/

function FloorCreation(locX,locY,locZ){
	let floorObj = ObjPrim_Create(OBJ_SPRITE_3D);
	ObjPrim_SetTexture(floorObj,texturefloor);
	Obj_SetRenderPriorityI(floorObj,20);
	ObjSprite3D_SetSourceDestRect(floorObj,0,0,512,512);
	ObjRender_SetScaleXYZ(floorObj,1,1,0);
	ObjRender_SetZWrite(floorObj,true);

	ObjRender_SetAngleXYZ(floorObj,90,0,0); // Floor-styled render

	ObjRender_SetPosition(floorObj,locX,locY,locZ); // Positioning of floor, notice function parameters
}

function WallCreation(locX,locY,locZ){
	let floorObj = ObjPrim_Create(OBJ_SPRITE_3D);
	ObjPrim_SetTexture(floorObj,texturewall);
	Obj_SetRenderPriorityI(floorObj,20);
	ObjSprite3D_SetSourceDestRect(floorObj,0,0,1024,1024);
	ObjRender_SetScaleXYZ(floorObj,0.5,1,0);
	ObjRender_SetZWrite(floorObj,true);

	ObjRender_SetAngleXYZ(floorObj,0,90,0); // Wall-styled render

	ObjRender_SetPosition(floorObj,locX,locY,locZ);

}

function FogCreation(locX,locY,locZ){
	let floorObj = ObjPrim_Create(OBJ_SPRITE_3D);
	ObjPrim_SetTexture(floorObj,texturefog);
	Obj_SetRenderPriorityI(floorObj,20);
	ObjSprite3D_SetSourceDestRect(floorObj,0,0,1024,1024); // Fully covers screen
	ObjRender_SetScaleXYZ(floorObj,4,4,0);
	ObjRender_SetZWrite(floorObj,true);

	// ObjRender_SetAngleXYZ(floorObj,0,0,0); -> NOT USED,
	// as the fog will always be facing player

	ObjSprite3D_SetBillboard(floorObj,true);
	ObjRender_SetPosition(floorObj,locX,locY,locZ);

}

@Initialize{
	// Call the task to start stage renders
	//SetIntersectionVisualization(true);
	StageTime;
	scrollitbabe;
}

@Event{

} 

@MainLoop{
	yield;
}

@Finalize{

}

task StageTime{

	// Fog construction
	SetFogEnable(true);
	SetFogParam(1024,1536,20,15,35);
	FogCreation(0,0,2048);

	// Stage construction, like cardboard house building
	ascent(i in 0..4){
		FloorCreation(0,0,512*i);
		yield;
	}
	ascent (i in 0..4){
		WallCreation(-256,256,512*i);
		yield;
	}
	ascent (i in 0..4){
		WallCreation(256,256,512*i);
		yield;
	}

}

// Stage scrolling

/* Guide : CAMERAS?????

* AZIMUTH *

SetCameraAzimuthAngle(0); - ?????
SetCameraElevationAngle(0); - How HIGH the camera is
SetCameraRadius(0); - How FAR the camera is

* FOCUS *

SetCameraFocusX(0);
SetCameraFocusY(0);
SetCameraFocusZ(0);

* ????? *

SetCameraYaw(0);
SetCameraPitch(0);
SetCameraRoll(0);
*/
task scrollitbabe{
	let scroll = 0;
	let ang = 0;
	let theyaeur = -180;
	// CAMERA SYSTEM handled here

	// Min/max camera render distance
	SetCameraPerspectiveClip(16,6000);

	// Camera settings - TBE (to be explained)
	async{
		loop{
			SetCameraAzimuthAngle(theyaeur);
			theyaeur = Interpolate_Decelerate(-105, -115, cos(NormalizeAngle(ang)));
			ang += 1;
			yield;
		}
	}

	
	SetCameraElevationAngle(15);
	SetCameraRadius(64);
	SetCameraFocusX(0);
	SetCameraFocusY(512);
	SetCameraFocusZ(-512);

	/* GUIDE : The scroll illusion

	Make a variable, add it to CameraZ
	Count the variable to move CameraZ forward
	At a certain point, reset it back to the beginning
	Add fog, profit(?) */

	loop{
		SetCameraFocusZ(-512+scroll);
		if(scroll > 512){
			scroll = 0;
		}
		scroll+=24;
		yield;
	}

	// Maintaining the perfect illusion with Fog
}