<shader>{
	"name"		: "ArmatureSkinPhong",
	"ubo"		: [ "UBOGlobal", "UBOModel", "UBOArmature", "UBOLighting" ],
	"uniforms":[
		{ "name":"uBaseColor", "type":"rgba" }
	]
}<\shader>

<materials>[
	{ "name":"ArmatureSkinPhong",	"uniforms":[
		{ "name":"uBaseColor", "value": "ff7f7fff" }
	], "options":{ "cullFace": true }},

	{ "name":"ArmatureSkinPhongGray",	"uniforms":[
		{ "name":"uBaseColor", "value": "A0A0A0cc" }
	], "options":{ "cullFace": false }},

	{ "name":"LowPolyPhong_grayBlend",	"uniforms":[
		{ "name":"uBaseColor", "value": "A0A0A088" }
	], "options":{ "blend":true }}
]<\materials> "useBlending":false
	
<vertex>
	#version 300 es
	layout(location=0) in vec4 a_position;
	layout(location=1) in vec3 a_norm;
	layout(location=2) in vec2 a_uv;

	layout(location=8) in vec4 a_boneIndex;
	layout(location=9) in vec4 a_boneWeight;

	uniform UBOGlobal{
		mat4	projViewMatrix;
		vec3	cameraPos;
		float	globalTime;
		vec2	screenSize;
	};

	uniform UBOModel{
		mat4 	modelMatrix;
		mat3	normalMatrix;
	};

	uniform UBOArmature{
		mat2x4[90]	bones;
		vec3[90]	scale;
		int 		boneCount;
	} Arm;

	out vec3 v_worldPos;
	out vec3 v_cameraPos;

	vec3 dqVecTransform(mat2x4 dq, vec3 v){
		vec4 Qr 	= dq[0].xyzw; //real (rot)
		vec4 Qd 	= dq[1].xyzw; //dual (trans)
		vec3 pos	= v + cross(2.0 * Qr.xyz, cross(Qr.xyz, v) + Qr.w * v);	//Rotate Vector
		vec3 tran	= 2.0 * (Qr.w * Qd.xyz - Qd.w * Qr.xyz + cross(Qr.xyz, Qd.xyz));	//Pull out Translation from DQ
		//vec3 tran = 2.0 * Qd.xyz * -Qr.xyz;
		return pos + tran;
	}

	vec3 dqVecTransform2(mat2x4 dq, vec3 v){
		vec4 Qr 	= dq[0].xyzw; //real (rot)
		vec4 Qd 	= dq[1].xyzw; //dual (trans)
		vec3 pos	= v + 2.0 * cross( Qr.xyz, cross(Qr.xyz, v) + Qr.w * v);	//Rotate Vector
		vec3 tran	= 2.0 * (Qr.w * Qd.xyz - Qd.w * Qr.xyz + cross(Qr.xyz, Qd.xyz));	//Pull out Translation from DQ
		return pos + tran;
	}

	vec3 dqBoneTransform_4(vec3 pos, mat2x4[90] bDQ, vec4 bIndex, vec4 bWeight, vec3[90] bScale){
		/* NORMALIZE DATA FIRST */
		int a = int( bIndex.x ),
			b = int( bIndex.y ),
			c = int( bIndex.z ),
			d = int( bIndex.w );
		bWeight *= 1.0 / (bWeight.x + bWeight.y + bWeight.z + bWeight.w); // 1 Div, 4 Mul, instead of 4 Div.

		/* APPLY WEIGHTS */
		mat2x4 dqSum 	=	bDQ[ a ] * bWeight.x +  
							bDQ[ b ] * bWeight.y +
							bDQ[ c ] * bWeight.z +
							bDQ[ d ] * bWeight.w;

		//dqSum *= 1.0 / length( dqSum[0] ); // Normalize DQ by the length of the Quaternion
		dqSum /= length( dqSum[0] ); // Normalize DQ by the length of the Quaternion

		vec3 wScale 	=	bScale[ a ]	* bWeight.x +
							bScale[ b ]	* bWeight.y +
							bScale[ c ]	* bWeight.z +
							bScale[ d ]	* bWeight.w;

		/* SCALE, ROTATE - TRANSLATE */
		//return dqVecTransform(dqSum, pos * wScale);
		return dqVecTransform(dqSum, pos);
		//return dqVecTransform2(dqSum, pos);

		//vec4 Qr 	= dqSum[0].xyzw; //real (rot)
		//vec4 Qd 	= dqSum[1].xyzw; //dual (trans)

		//vec3 position = pos + 2.0 * cross( Qr.xyz, cross(Qr.xyz, pos) + Qr.w * pos);
		////vec3 position = pos + cross( 2.0 * Qr.xyz, cross(Qr.xyz, pos) + Qr.w * pos);
		////vec3 position = pos + 2.0 * cross( Qr.yzw, cross(Qr.yzw, pos.xyz) + Qr.x * pos);
		////vec3 trans = 2.0 * ( Qr.x * Qd.yzw - Qd.x * Qr.yzw + cross( Qr.yzw, Qd.yzw));
		//vec3 trans = 2.0 * ( Qr.w * Qd.xyz - Qd.w * Qr.xyz + cross( Qr.xyz, Qd.xyz) );
		//position += trans; 

		//return position;
	}

	void main(void){
		vec3 pos	= dqBoneTransform_4(a_position.xyz, Arm.bones, a_boneIndex, a_boneWeight, Arm.scale);
		vec4 wpos	= modelMatrix * vec4( pos, 1.0 );

		v_worldPos	= wpos.xyz;
		v_cameraPos	= cameraPos;
		gl_Position = projViewMatrix * wpos;
	}
<\vertex>

<fragment>
	#version 300 es
	precision mediump float;

	uniform UBOLighting{
		vec3 lightPosition;
		vec3 lightDirection;
		vec3 lightColor;
	};

	uniform vec4 uBaseColor;

	in vec3 v_cameraPos;
	in vec3 v_worldPos;

	out vec4 oFragColor;

	//const vec3 uBaseColor			= vec3(1.0, 0.498, 0.498); //ff 7f 7f
	//const vec3 uBaseColor			= vec3(0.95, 0.95, 0.95); //ff 7f 7f
	const float uAmbientStrength	= 0.5;
	const float uDiffuseStrength	= 0.5;
	const float uSpecularStrength	= 0.2f;	//0.15
	const float uSpecularShininess	= 1.0f; //256.0

	vec4 phongLight(vec3 norm, vec3 vertPos, vec3 camPos){
		//Ambient Lighting
		vec3 cAmbient		= lightColor * uAmbientStrength;
		
		//Diffuse Lighting
		vec3 lightVector	= normalize(lightPosition - vertPos);	//light direction based on pixel world position
		float diffuseAngle	= max( dot(norm,lightVector) ,0.0);		//Angle between Light Direction and Pixel Direction (1==90d)
		vec3 cDiffuse		= lightColor * diffuseAngle * uDiffuseStrength;

		//Specular Lighting
		vec3 camVector		= normalize(camPos - vertPos);		//Camera Direction based on pixel world position
		vec3 reflectVector	= reflect(-lightVector, norm);		//Reflective direction of line from pixel direction as pivot.
		float specular		= pow( max( dot(reflectVector,camVector) ,0.0), uSpecularShininess ); //Angle of reflected light and camera eye
		vec3 cSpecular		= lightColor * specular * uSpecularStrength;

		//Final Color
		return vec4(uBaseColor.rgb * (cAmbient + cDiffuse + cSpecular), uBaseColor.a);
	}

	vec3 lowPolyNormal(vec3 vertPos){  //Calc the Normal of the Rasterizing Pixel
		return normalize( cross( dFdx(vertPos), dFdy(vertPos) ) );
	}

	void main(void){
		oFragColor = phongLight( lowPolyNormal(v_worldPos) , v_worldPos, v_cameraPos);
		//oFragColor = vec4(0.0, 0.0, 0.0, 1.0);
	}
<\fragment>