/*
	<behavior jsname="behavior_FPSflashlight" description="FPS Flashlight">
		<property name="radius" type="float" default="10.0" />
		<property name="softness" type="float" default="2.0" />
	</behavior>
*/
behavior_FPSflashlight = function(){}
behavior_FPSflashlight.prototype.onAnimate = function(node, timeMs){
	this.name = ccbGetSceneNodeProperty(node, "Name");
	ccbSetCopperCubeVariable(this.name + ".radius", this.radius);
	ccbSetCopperCubeVariable(this.name + ".softness", this.softness);
	for(i = 0; i < ccbGetSceneNodeMaterialCount(node); ++i)
		ccbSetSceneNodeMaterialProperty(node, i, 'Type', this.material(this.name));
    this.onAnimate = function(){};
}
behavior_FPSflashlight.prototype.material = function(name){
    var vertexShader = 									
	"uniform mat4 mWorldViewProj;													\n" +
	"uniform mat4 mTransWorld;														\n" +
	"uniform mat4 mInvWorld;														\n" +
	"uniform vec3 camPos;															\n" +
	"varying float depth;															\n" +
	"varying vec3 fragToCam;														\n" +
	"varying vec3 fragNormal;														\n" +
	"void main(void) {																\n" +
	"	gl_Position = mWorldViewProj * gl_Vertex;									\n" +
	"	gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0);					\n" +
	"	gl_TexCoord[0] = gl_MultiTexCoord0;											\n" +
	"	vec4 worldPos = mTransWorld * gl_Vertex;									\n" +
	"	vec3 fragPos = vec3(worldPos);												\n" +
	"	fragToCam = camPos - fragPos;												\n" +
	"	fragNormal = normalize(vec3(mInvWorld * vec4(gl_Normal, 0.0)));				\n" +
	"   depth = gl_Position.w;														\n" +
	"}";
	var fragmentShader = 
	"uniform sampler2D myTexture;                                   				\n" +
	"uniform float radius;                                   						\n" +
	"uniform float softness;                                   						\n" +
	"varying float depth;															\n" +
	"varying vec3 fragToCam;														\n" +
	"varying vec3 fragNormal;														\n" +
	"void main(void) {                                              				\n" +
	"	vec2 texCoord = gl_TexCoord[0].st;											\n" +
	"	vec4 col = texture2D(myTexture, texCoord);               					\n" +
	"	vec3 normal = normalize(fragNormal);										\n" +
	"	vec3 lightDir = normalize(fragToCam);										\n" +
	"	float intensity = max(dot(normal, lightDir), 0.0);							\n" +
	"	vec2 st = gl_FragCoord.xy / vec2(800.0, 600.0);                             \n" +
	"	vec2 center = vec2(0.5, 0.5);                                               \n" +
	"	float dist = length(st - center) * depth;                                   \n" +
	"	float smoothStep = smoothstep(radius + softness, radius - softness, dist);  \n" +
	"	col.rgb *= intensity;														\n" +
	"	col.rgb -= mix(depth, depth / 50, smoothStep) / 50;							\n" +
	"	gl_FragColor = col;															\n" +
	"}";
	var shaderCallBack = function(){
		let pos = ccbGetSceneNodeProperty(ccbGetActiveCamera(), "PositionAbs");
		let radius = ccbGetCopperCubeVariable(name + ".radius");
		let softness = ccbGetCopperCubeVariable(name + ".softness");
		ccbSetShaderConstant(1, "camPos", pos.x, pos.y, pos.z, null);
		ccbSetShaderConstant(2, "radius", radius, null, null, null);
		ccbSetShaderConstant(2, "softness", softness, null, null, null);
	};
    return ccbCreateMaterial(vertexShader, fragmentShader, 13, shaderCallBack);
}