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attribute highp vec3 position;
attribute mediump vec3 normal;
attribute mediump vec2 uv;
 
varying highp vec3 posVarying;
varying mediump vec3 normalVarying;
varying mediump vec3 lightVarying;
 
uniform highp mat3 agk_WorldNormal;
uniform highp mat4 agk_World;
uniform highp mat4 agk_ViewProj;
 
vec3 GetVSLighting( mediump vec3 normal, highp vec3 pos );
 
void main()
{
    vec4 pos = agk_World * vec4(position,1.0);
    gl_Position = agk_ViewProj * pos;
    vec3 norm = normalize(agk_WorldNormal * normal);
    posVarying = pos.xyz;
    normalVarying = norm;
    lightVarying = GetVSLighting( norm, posVarying );
}

uniform sampler2D texture0;
uniform sampler2D texture1;
 
varying highp vec3 posVarying;
varying mediump vec3 normalVarying;
varying mediump vec3 lightVarying;

mediump vec3 grassColor = vec3(0.89, 1.08, 0.77);
mediump vec3 rockColor = vec3(0.75, 0.75, 0.75);

mediump vec3 GetPSLighting( mediump vec3 normal, highp vec3 pos );
mediump vec3 ApplyFog( mediump vec3 color, highp vec3 pointPos );

void main()
{ 
    vec3 norm = normalize(normalVarying);
    
	vec3 texCoord = posVarying;
	if (normalVarying.x < 0.0)
		texCoord.x = -texCoord.x;
	if (normalVarying.y < 0.0)
		texCoord.y = -texCoord.y;
	if (normalVarying.z < 0.0)
		texCoord.z = -texCoord.z;
	
    vec3 diffuseX = texture2D(texture0, texCoord.zy * 0.5).rgb;
	vec3 diffuseY = texture2D(texture0, texCoord.xz * 0.5).rgb;
	vec3 diffuseZ = texture2D(texture0, texCoord.xy * 0.5).rgb;
	
	vec3 weight = abs(normalVarying);
	weight = weight / (weight.x + weight.y + weight.z);
	vec3 diffuse = diffuseX * weight.x + diffuseY * weight.y + diffuseZ * weight.z;
	
	vec3 normX = texture2D(texture1, texCoord.zy * 0.5).xyz * 2.0 - 1.0;
	vec3 normY = texture2D(texture1, texCoord.xz * 0.5).xyz * 2.0 - 1.0;
	vec3 normZ = texture2D(texture1, texCoord.xy * 0.5).xyz * 2.0 - 1.0;
	
	//Swizzled Normals
	vec3 axisSign = step(0.0, normalVarying) * 2.0 - 1.0;
	normX.z *= axisSign.x;
	normY.z *= axisSign.y;
	normZ.z *= axisSign.z;

	//Whiteout Blend
//~	normX = vec3(normX.xy + normalVarying.zy, abs(normX.z) * normalVarying.x);
//~	normY = vec3(normY.xy + normalVarying.xz, abs(normY.z) * normalVarying.y);
//~	normZ = vec3(normZ.xy + normalVarying.xy, abs(normZ.z) * normalVarying.z);

	//UDN Blend
//~	normX = vec3(normX.xy + normalVarying.zy, normalVarying.x);
//~	normY = vec3(normY.xy + normalVarying.xz, normalVarying.y);
//~	normZ = vec3(normZ.xy + normalVarying.xy, normalVarying.z);
	
	vec3 normal = normalize(normX.zyx * weight.x + normY.xzy * weight.y + normZ.xyz * weight.z);
	
	vec3 light = lightVarying + GetPSLighting( normal, posVarying );
	
	float t = dot(vec3(0.0,1.0,0.0), norm);
	vec3 colorNormal = mix( rockColor, grassColor, pow(max(0.0,t),0.7));
	
	vec4 finalColor = vec4(diffuse * colorNormal * light, 1.0);
    finalColor.rgb = ApplyFog( finalColor.rgb, posVarying );
    
    gl_FragColor = finalColor;
}