/*
BSLex (BSL Edit) by LexBoosT
*/

//Settings//
#include "/lib/settings.glsl"

//Fragment Shader///////////////////////////////////////////////////////////////////////////////////
#ifdef FSH

//Extensions//

//Varyings//
varying vec2 texCoord, lmCoord;

varying vec3 normal;
varying vec3 sunVec, upVec, eastVec;

varying vec4 color;

//Uniforms//
uniform int frameCounter;
uniform int isEyeInWater;
uniform int worldTime;
uniform int heldItemId;
uniform int heldItemId2;

uniform float blindFactor;
uniform float far, near;
uniform float frameTimeCounter;
uniform float nightVision;
uniform float rainStrength;
uniform float screenBrightness;
uniform float shadowFade;
uniform float timeAngle, timeBrightness;
uniform float viewWidth, viewHeight;

uniform ivec2 eyeBrightnessSmooth;

uniform vec3 skyColor;
uniform vec3 fogColor;

uniform mat4 gbufferProjectionInverse;
uniform mat4 gbufferModelViewInverse;
uniform mat4 shadowProjection;
uniform mat4 shadowModelView;

uniform sampler2D texture;

#ifdef SOFT_PARTICLES
uniform sampler2D depthtex0;
#endif

//Common Variables//
float eBS = eyeBrightnessSmooth.y / 255.0;
float sunVisibility  = clamp(dot( sunVec,upVec) + 0.05, 0.0, 0.1) * 10.0;
float moonVisibility = clamp(dot(-sunVec,upVec) + 0.05, 0.0, 0.1) * 10.0;

#ifdef WORLD_TIME_ANIMATION
float frametime = float(worldTime) * 0.05 * ANIMATION_SPEED;
#else
float frametime = frameTimeCounter * ANIMATION_SPEED;
#endif

vec3 lightVec = sunVec * ((timeAngle < 0.5325 || timeAngle > 0.9675) ? 1.0 : -1.0);

//Common Functions//
float GetLuminance(vec3 color){
	return dot(color,vec3(0.299, 0.587, 0.114));
}

float InterleavedGradientNoise(){
	float n = 52.9829189 * fract(0.06711056 * gl_FragCoord.x + 0.00583715 * gl_FragCoord.y);
	return fract(n + frameCounter / 8.0);
}

#ifdef SOFT_PARTICLES
float GetLinearDepth(float depth) {
	return (2.0 * near) / (far + near - depth * (far - near));
}
#endif

//Includes//
#include "/lib/color/blocklightColor.glsl"
#include "/lib/color/dimensionColor.glsl"
#include "/lib/color/skyColor.glsl"
#include "/lib/util/dither.glsl"
#include "/lib/util/spaceConversion.glsl"
#include "/lib/atmospherics/fog.glsl"
#include "/lib/lighting/forwardLighting.glsl"

#if AA >1
#include "/lib/util/jitter.glsl"
#endif


//Program//
void main(){
	vec4 albedo = texture2D(texture, texCoord) * color;
	
	if (albedo.a > 0.00001){
		vec2 lightmap = clamp(lmCoord, vec2(0.0), vec2(1.0));
		
		vec3 screenPos = vec3(gl_FragCoord.xy / vec2(viewWidth, viewHeight), gl_FragCoord.z);
		#if AA > 1
		vec3 viewPos = ToNDC(vec3(TAAJitter(screenPos.xy, -0.5), screenPos.z));
		#else
		vec3 viewPos = ToNDC(screenPos);
		#endif
		vec3 worldPos = ToWorld(viewPos);

		#ifdef PARTICLES_VISIBILITY
		float lViewPos = length(viewPos);
		#endif

		float dither = Bayer64(gl_FragCoord.xy);

		#if DISTANT_FADE > 0
		if (AA > 1) dither = fract(frameTimeCounter * 32.0 + dither);
		#if DISTANT_FADE == 1
		float worldLength = length(worldPos);
		#elif DISTANT_FADE == 2
		float worldLength = length(worldPos.xz);
		#endif
		float alpha = (far - (worldLength + 20.0)) * 5.0 / far;
		if (alpha < dither) discard;
		#endif

		albedo.rgb = pow(albedo.rgb, vec3(2.2));
		
		#ifdef WHITE_WORLD
		#ifdef TEXTURESW
		albedo.rgb = vec3(0.5);
		#endif
		#endif
		#ifdef BLACK_WORLD
		#ifdef TEXTURESW
		albedo.rgb = vec3(0.0);
		#endif
		#endif

		float NoL = 1.0;
		float NoU = clamp(dot(normal, upVec), -1.0, 1.0);
		float NoE = clamp(dot(normal, eastVec), -1.0, 1.0);
		float vanillaDiffuse = (0.25 * NoU + 0.75) + (0.667 - abs(NoE)) * (1.0 - abs(NoU)) * 0.15;
			  vanillaDiffuse*= vanillaDiffuse;
		
		vec3 shadow = vec3(0.0);
		GetLighting(albedo.rgb, shadow, viewPos, worldPos, lightmap, 1.0, NoL, 1.0,	1.0, 0.0, 0.0,0.0);

		#ifdef PARTICLES_VISIBILITY
		if (far > 50) albedo.a *= clamp(far - 30 - lViewPos, 0.0, 1.0);
		if (lViewPos < 2) albedo.a *= smoothstep(0.7, 2.0, lViewPos) + 0.0002;
		#endif
		
		#if defined FOG && MC_VERSION >= 11500
		Fog(albedo.rgb, viewPos);
		#endif
	}
	
	#ifdef SOFT_PARTICLES
	float linearZ = GetLinearDepth(gl_FragCoord.z) * (far - near);
	float backZ = texture2D(depthtex0, gl_FragCoord.xy / vec2(viewWidth, viewHeight)).r;
	float linearBackZ = GetLinearDepth(backZ) * (far - near);
	
	float difference = clamp(linearBackZ - linearZ, 0.0, 1.0);
	difference = difference * difference * (3.0 - 2.0 * difference);
	
	float opaqueThreshold = fract(Bayer64(gl_FragCoord.xy) + frameTimeCounter * 8.0);
	
	if (albedo.a > 0.999) albedo.a *= float(difference > opaqueThreshold);
	else albedo.a *= difference;
	#endif
	
	/* DRAWBUFFERS:0 */
	gl_FragData[0] = albedo;
	
	#ifdef ADVANCED_MATERIALS
	/* DRAWBUFFERS:0367 */
	gl_FragData[1]=vec4(0.1,0.,0.,1.);
	gl_FragData[2]=vec4(0.,0.,0.,1.);
	gl_FragData[3]=vec4(0.,0.,0.,1.);
	#endif
}

#endif

//Vertex Shader/////////////////////////////////////////////////////////////////////////////////////
#ifdef VSH

//Varyings//
varying vec2 texCoord,lmCoord;

varying vec3 normal;
varying vec3 sunVec,upVec, eastVec;

varying vec4 color;
varying vec4 position;
//Uniforms//
uniform int worldTime;

uniform float frameTimeCounter;
uniform float timeAngle;

uniform vec3 cameraPosition;

uniform mat4 gbufferModelView,gbufferModelViewInverse;

#if AA > 1
uniform int frameCounter;
uniform float viewWidth,viewHeight;
#endif

#ifdef SOFT_PARTICLES
uniform float far,near;
#endif

//Attributes//
attribute vec4 mc_Entity;
attribute vec4 mc_midTexCoord;

//Common Variables//
#ifdef WORLD_TIME_ANIMATION
float frametime=float(worldTime)*.05*ANIMATION_SPEED;
#else
float frametime=frameTimeCounter*ANIMATION_SPEED;
#endif

//Common Functions//
#ifdef SOFT_PARTICLES
float GetLinearDepth(float depth){
	return(2.*near)/(far+near-depth*(far-near));
}

float GetLogarithmicDepth(float depth){
	return-(2.*near/depth-(far+near))/(far-near);
}
#endif

//Includes//
#if AA >1
#include "/lib/util/jitter.glsl"
#endif

#ifdef WORLD_CURVATURE
#include "/lib/vertex/worldCurvature.glsl"
#endif

//Program//
void main(){
	texCoord=(gl_TextureMatrix[0]*gl_MultiTexCoord0).xy;
	
	lmCoord=(gl_TextureMatrix[1]*gl_MultiTexCoord1).xy;
	lmCoord=clamp((lmCoord-.03125)*1.06667,0.,1.);
	
	normal=normalize(gl_NormalMatrix*gl_Normal);
	
	color=gl_Color;
	
	const vec2 sunRotationData=vec2(cos(sunPathRotation*.01745329251994),-sin(sunPathRotation*.01745329251994));
	float ang=fract(timeAngle-.25);
	ang=(ang+(cos(ang*3.14159265358979)*-.5+.5-ang)/3.)*6.28318530717959;
	sunVec=normalize((gbufferModelView*vec4(vec3(-sin(ang),cos(ang)*sunRotationData)*2000.,1.)).xyz);
	
	upVec=normalize(gbufferModelView[1].xyz);
	eastVec = normalize(gbufferModelView[0].xyz);

	vec4 position=gbufferModelViewInverse*gl_ModelViewMatrix*gl_Vertex;
	
	#ifdef WORLD_CURVATURE
	position.y-=WorldCurvature(position.xz);
	#endif
	
	#ifdef MOUVEMENT_CAM
	position+=vec4(.03*sin(frameTimeCounter*3.),.015*cos(frameTimeCounter*4.),0.,0.)*gbufferModelView;
	#endif
	
	gl_Position=gl_ProjectionMatrix*gbufferModelView*position;
	
	#ifdef SOFT_PARTICLES
	gl_Position.z=GetLinearDepth(gl_Position.z/gl_Position.w)*(far-near);
	gl_Position.z-=.25;
	gl_Position.z=GetLogarithmicDepth(gl_Position.z/(far-near))*gl_Position.w;
	#endif
	
	#if AA > 1
	gl_Position.xy=TAAJitter(gl_Position.xy,gl_Position.w);
	#endif
}

#endif