
varying vec2 varyTexCoordDetail;

uniform sampler2D texDetailUV0;
uniform sampler2D texDetailUV1;
uniform sampler2D texDetailUV2;
uniform sampler2D texDetailDef0_8;
uniform sampler2D texDetail;

uniform float tmp;
uniform vec3 uUVInterp0;
uniform vec3 uUVInterp1;

float calcDetailLayerCoeff(vec3 def0, vec3 weights0)
{
	return clamp( 1.5 - 2.5 * dot(def0, weights0), 0.0, 1.0 );
}

vec3 applyDetail(vec3 color)
{
	
	vec4 detailCoords0 = texture2D(texDetailUV0, varyTexCoordDetail);
	vec4 detailCoords1 = texture2D(texDetailUV1, varyTexCoordDetail);
	vec4 detailCoords2 = texture2D(texDetailUV2, varyTexCoordDetail);
	vec3 detail0 = vec3(
		texture2D(texDetail, detailCoords0.xy).a,
		texture2D(texDetail, detailCoords1.xy).a,
		texture2D(texDetail, detailCoords2.xy).a);
	vec3 detail1 = vec3(
		texture2D(texDetail, detailCoords0.zw).a,
		texture2D(texDetail, detailCoords1.zw).a,
		texture2D(texDetail, detailCoords2.zw).a);
		
	vec3 slowLayerDef = texture2D(texDetailDef0_8, varyTexCoordDetail).xyz;
	
	float detailLayer0 = dot(detail0, uUVInterp0);
	float detailLayer1 = dot(detail1, uUVInterp1);

	float C = calcDetailLayerCoeff(slowLayerDef, uUVInterp0);
	
	float detail = mix(detailLayer1, detailLayer0, C);
	
	color *= (1.9 * detail);
	return tmp * color + (1.0 - tmp) * vec3(detail);
}
