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#version 120

#define ONE 0.00390625
#define ONEHALF 0.001953125

uniform sampler2D texture0; // Diffuse
uniform sampler2D texture1; //Normal Map
uniform sampler2D texture2; //Moss
uniform sampler2D texture3; //Moss Normal Map
uniform sampler2D texture4;
uniform sampler2D texture5;
uniform sampler2D texture6; 
uniform sampler2D texture7; // Shadow

//uniform mediump vec3 SunLightValue;

varying highp vec3 posVarying;
varying mediump vec3 TangentViewPos;
varying mediump vec3 TangentLightPos;
varying mediump vec3 TangentFragPos;
varying mediump vec3 normalVarying;
varying mediump vec2 uvVarying;
varying mediump vec3 lightVarying;

uniform mediump vec4 agk_MeshEmissive;
uniform mediump vec4 agk_MeshDiffuse;
uniform mediump vec3 agk_CameraPos;
uniform float agk_time;
uniform float water_level;
uniform float mossScale;

mediump vec3 GetPSLighting( mediump vec3 normal, highp vec3 pos );
mediump vec3 ApplyFog( mediump vec3 color, highp vec3 pointPos );
float noise(mediump vec2 st);

void main()
{
	mediump vec3 viewDir  = normalize( TangentViewPos - TangentFragPos );
	mediump vec3 lightDir = normalize( TangentLightPos - TangentFragPos );
	mediump vec4 MainColor = texture2D(texture0, uvVarying);
	mediump vec4 MossColor = texture2D(texture2, uvVarying);
	
	mediump vec3 RocknormalMap = texture2D(texture1, uvVarying).rgb;
	mediump vec3 ambient = 0.2 * MainColor.rgb;
	RocknormalMap = normalize(RocknormalMap*2.0-1.0);
	float diff = max(dot(lightDir, RocknormalMap), 0.05);
	MainColor.rgb = diff*MainColor.rgb;
	//spec
	mediump vec3 halfwayDir = normalize(lightDir + viewDir);  
	float spec = pow(max(dot(RocknormalMap.rgb, halfwayDir), 0.0), 32.0);
	mediump vec3 specular = vec3(.02) * spec;
	MainColor.rgb = MainColor.rgb+specular+ambient;
	
	mediump vec3 MossNormalMap = texture2D(texture3, uvVarying).rgb;
	ambient = 0.2 * MossColor.rgb;
	MossNormalMap = normalize(MossNormalMap*2.0-1.0);
	diff = max(dot(lightDir, MossNormalMap), 0.05);
	MossColor.rgb = diff*MossColor.rgb;
	//spec
	halfwayDir = normalize(lightDir + viewDir);  
	spec = pow(max(dot(MossNormalMap.rgb, halfwayDir), 0.0), 32.0);
	specular = vec3(.02) * spec;
	MossColor.rgb = MossColor.rgb+specular+ambient;
	
	
	float n = noise(uvVarying*mossScale*agk_time*.01); //uvVarying can be any vec2
	vec3 finalColor = mix(MainColor.rgb,MossColor.rgb,n);
	
	mediump vec3 light = clamp(lightVarying + GetPSLighting( normalVarying, posVarying ),.5,1.0); 
	finalColor = ApplyFog( finalColor * light, posVarying );
	finalColor = mix( finalColor, vec3( 0.63529, .89, .86 ), clamp((posVarying.y+(water_level*-1.0))/-2.45,0,1) );
	gl_FragColor = vec4(finalColor,MainColor.a)*agk_MeshDiffuse+agk_MeshEmissive;
	
}


float random (vec2 st) {
    return fract(sin(dot(st.xy,
                         vec2(12.9898,78.233)))*43758.5453123);
}

float noise (vec2 st) {
    vec2 i = floor(st);
    vec2 f = fract(st);

    // Four corners in 2D of a tile
    float a = random(i);
    float b = random(i + vec2(1.0, 0.0));
    float c = random(i + vec2(0.0, 1.0));
    float d = random(i + vec2(1.0, 1.0));

    // Smooth Interpolation

    // Cubic Hermine Curve.  Same as SmoothStep()
    vec2 u = f*f*(3.0-2.0*f);
    // u = smoothstep(0.,1.,f);

    // Mix 4 coorners percentages
    return mix(a, b, u.x) +
            (c - a)* u.y * (1.0 - u.x) +
            (d - b) * u.x * u.y;
}

#version 120

uniform sampler2D texture0; // Diffuse
uniform sampler2D texture1; //Normal Map
uniform sampler2D texture2; //Moss
uniform sampler2D texture3; //Noise texture
uniform sampler2D texture4;
uniform sampler2D texture5;
uniform sampler2D texture6; 
uniform sampler2D texture7; // Shadow

//uniform mediump vec3 SunLightValue;

varying highp vec3 posVarying;
varying mediump vec3 vertPos;
varying mediump vec3 TangentViewPos;
varying mediump vec3 TangentLightPos;
varying mediump vec3 TangentFragPos;
varying mediump vec3 normalVarying;
varying mediump vec2 uvVarying;
varying mediump vec3 lightVarying;

uniform mediump vec4 agk_MeshEmissive;
uniform mediump vec4 agk_MeshDiffuse;
uniform mediump vec3 agk_CameraPos;
uniform float agk_time;
uniform float water_level;
uniform float mossHeight;

mediump vec3 GetPSLighting( mediump vec3 normal, highp vec3 pos );
mediump vec3 ApplyFog( mediump vec3 color, highp vec3 pointPos );
mediump vec3 blend(mediump vec4 TextureA, float a1, mediump vec4 TextureB, float a2);

void main()
{

	mediump vec3 viewDir  = normalize( TangentViewPos - TangentFragPos );
	mediump vec3 lightDir = normalize( TangentLightPos - TangentFragPos );
	mediump vec4 MainColor = texture2D(texture0, uvVarying);
	mediump vec4 RocknormalMap = texture2D(texture1, uvVarying);
	mediump vec4 MossColor = texture2D(texture2, uvVarying);
	
	float n = 1.0-RocknormalMap.a;
	//float n = texture2D(texture3, uvVarying).r; // for own noise texture
	float k = clamp(vertPos.y/mossHeight,0.0,1.0);
	n = k*n;
	vec3 finalColor =  blend(MainColor,(1.0-n),MossColor,n);
	
	mediump vec3 ambient = 0.2 * finalColor.rgb;
	RocknormalMap.rgb = normalize(RocknormalMap.rgb*2.0-1.0);
	float diff = max(dot(lightDir, RocknormalMap.rgb), 0.05);
	finalColor.rgb = diff*finalColor.rgb;
	//spec
	mediump vec3 halfwayDir = normalize(lightDir + viewDir);  
	float spec = pow(max(dot(RocknormalMap.rgb, halfwayDir), 0.0), 32.0);
	mediump vec3 specular = vec3(.02) * spec;
	finalColor.rgb = finalColor.rgb+specular+ambient;
	
	
	mediump vec3 light = clamp(lightVarying + GetPSLighting( RocknormalMap.rgb, posVarying ),.5,1.0); 
	finalColor = ApplyFog( finalColor * light, posVarying );
	finalColor = mix( finalColor, vec3( 0.63529, .89, .86 ), clamp((posVarying.y+(water_level*-1.0))/-2.45,0,1) );
	gl_FragColor = vec4(finalColor,MainColor.a)*agk_MeshDiffuse+agk_MeshEmissive;
	
}

mediump vec3 blend(mediump vec4 TextureA, float a1, mediump vec4 TextureB, float a2)
{
    float depth = 0.4;
    float ma = max(TextureA.a + a1, TextureB.a + a2) - depth;

    float b1 = max(TextureA.a + a1 - ma, 0);
    float b2 = max(TextureB.a + a2 - ma, 0);

    return (TextureA.rgb * b1 + TextureB.rgb * b2) / (b1 + b2);
}