fungi.primatives.js

Fungi.Primatives = {
	Quad2U:function(){
		if(Fungi.Res.Vao["FungiQuad2U"]) return Fungi.Res.Vao["FungiQuad2U"];
		var aVert	= [-1,1,0,	-1,-1,0,	1,-1,0,	1,-1,0,	1,1,0,	-1,1,0],
			aUV		= [ 0,0, 	0,1,		1,1,	1,1,	1,0,	0,0];
		return Fungi.Shaders.VAO.standardMesh("FungiQuad2U",3,aVert,null,aUV,null,false);
	},

	Quad1U:function(){
		if(Fungi.Res.Vao["FungiQuad1U"]) return Fungi.Res.Vao["FungiQuad1U"];

		var aVert = [ -0.5,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0, 0.5,0.5,0 ],
			aUV = [ 0,0, 0,1, 1,1, 1,0 ],
			aIndex = [ 0,1,2, 2,3,0 ];
		return Fungi.Shaders.VAO.standardMesh("FungiQuad1U",3,aVert,null,aUV,aIndex,false);
	},

	FacedCube:function(keepRawData){
		var width = 1, height = 1, depth = 1, x = 0, y = 0, z = 0;
		var w = width*0.5, h = height*0.5, d = depth*0.5;
		var x0 = x-w, x1 = x+w, y0 = y-h, y1 = y+h, z0 = z-d, z1 = z+d;

		//Starting bottom left corner, then working counter clockwise to create the front face.
		//Backface is the first face but in reverse (3,2,1,0)
		//keep each quad face built the same way to make index and uv easier to assign
		var aVert = [
			x0, y1, z1, 0,	//0 Front
			x0, y0, z1, 0,	//1
			x1, y0, z1, 0,	//2
			x1, y1, z1, 0,	//3 

			x1, y1, z0, 1,	//4 Back
			x1, y0, z0, 1,	//5
			x0, y0, z0, 1,	//6
			x0, y1, z0, 1,	//7 

			x0, y1, z0, 2,	//7 Left
			x0, y0, z0, 2,	//6
			x0, y0, z1, 2,	//1
			x0, y1, z1, 2,	//0

			x0, y0, z1, 3,	//1 Bottom
			x0, y0, z0, 3,	//6
			x1, y0, z0, 3,	//5
			x1, y0, z1, 3,	//2

			x1, y1, z1, 4,	//3 Right
			x1, y0, z1, 4,	//2 
			x1, y0, z0, 4,	//5
			x1, y1, z0, 4,	//4

			x0, y1, z0, 5,	//7 Top
			x0, y1, z1, 5,	//0
			x1, y1, z1, 5,	//3
			x1, y1, z0, 5	//4
		];

		//Build the index of each quad [0,1,2, 2,3,0]
		var aIndex = [];
		for(var i=0; i < aVert.length / 4; i+=2) aIndex.push(i, i+1, (Math.floor(i/4)*4)+((i+2)%4));

		//Build UV data for each vertex
		var aUV = [];
		for(var i=0; i < 6; i++) aUV.push(0,0,	0,1,  1,1,  1,0);

		//Build Normal data for each vertex
		var aNorm = [
			 0, 0, 1,	 0, 0, 1,	 0, 0, 1,	 0, 0, 1,		//Front
			 0, 0,-1,	 0, 0,-1,	 0, 0,-1,	 0, 0,-1,		//Back
			-1, 0, 0,	-1, 0, 0,	-1, 0, 0,	-1, 0, 0,		//Left
			 0,-1, 0,	 0,-1, 0,	 0,-1, 0,	 0,-1, 0,		//Bottom
			 1, 0, 0,	 1, 0, 0,	 1, 0, 0,	 1, 0, 0,		//Right
			 0, 1, 0,	 0, 1, 0,	 0, 1, 0,	 0, 1, 0		//Top
		];

		return Fungi.Shaders.VAO.standardMesh("FungiFCube",4,aVert,aNorm,aUV,aIndex,false);
	},

	AppendCube:function(ary,ind,width,height,depth,x,y,z,id){
		var w = width*0.5, h = height*0.5, d = depth*0.5;
		var x0 = x-w, x1 = x+w, y0 = y-h, y1 = y+h, z0 = z-d, z1 = z+d;
		var ii = ary.length/4 ;
		//Front
		ary.push(	x0, y1, z1, id,	
					x0, y0, z1, id,
					x1, y0, z1, id,
					x1, y1, z1, id); 
		//Back
		ary.push(	x1, y1, z0, id,
					x1, y0, z0, id,
					x0, y0, z0, id,
					x0, y1, z0, id); 
		//Left
		ary.push(	x0, y1, z0, id,
					x0, y0, z0, id,
					x0, y0, z1, id,
					x0, y1, z1, id);
		//Bottom
		ary.push(	x0, y0, z1, id, 
					x0, y0, z0, id,
					x1, y0, z0, id,
					x1, y0, z1, id);
		//Right
		ary.push(	x1, y1, z1, id, 
					x1, y0, z1, id, 
					x1, y0, z0, id,
					x1, y1, z0, id);
		//Top
		ary.push(	x0, y1, z0, id, 
					x0, y1, z1, id,
					x1, y1, z1, id,
					x1, y1, z0, id);

		for(var i=0; i < 6*4; i+=2) ind.push(ii+i, ii+i+1, ii+(Math.floor(i/4)*4)+((i+2)%4) );
	},

	PolarSphere:function(verSteps,horSteps,radius,aryVerts,aryIndex){
		var isGeoOnly = (aryVerts !== undefined && aryIndex !== undefined);

		//Build a Half Circle
		var origin	= Math.PI * 0.5, //90Degrees
			inc		= Math.PI / (verSteps-1),
			rad		= 0,
			x		= 0,
			y		= 0,
			pathAry	= [];

		for(var i=0; i < verSteps; i++){
			rad = origin - (inc*i);
			x = radius * Math.cos(rad);
			y = radius * Math.sin(rad);
			pathAry.push(x,y,0);
		}

		//Rotate the half circle in increments to form a sphere.
		aryVerts = aryVerts || [];
		aryIndex = aryIndex || [];
		//var aryVerts = [], aryIndex = [];
		FungiExt.Mesh.lathe(pathAry,horSteps,"y",aryVerts);
		FungiExt.Mesh.triangleStrip(horSteps,pathAry.length/3,aryIndex,true);

		if(!isGeoOnly){
			var vao = Fungi.Shaders.VAO.standardMesh("FungiPolarSphere",3,aryVerts,null,null,aryIndex,false);
			return vao;
		}
	}
};