terrain.frag

#version 400 core
in vec3 position;
in vec2 uv;
in vec3 normal;
in vec3 material;

uniform vec3 cameraPos;
uniform vec3 lightDir;

uniform sampler2DArray albedoTex;
uniform sampler2DArray normalTex;
uniform sampler2DArray specularTex;
uniform sampler2DArray ambientTex;

out vec4 color;

void main()
{
	vec3 albedo 	= texture(albedoTex, vec3(uv, material[0])).rgb;	
	float ambient 	= texture(ambientTex, vec3(uv, material[0])).r;
	float spec 		= texture(specularTex, vec3(uv, material[0])).r;
	vec3 texNormal 	= texture(normalTex, vec3(uv, material[0])).rgb;
	//texture blending
	albedo 	= 	mix(albedo,	texture(albedoTex, vec3(uv, material[1])).rgb, material[2]);
	ambient = 	mix(ambient,texture(ambientTex,  vec3(uv, material[1])).r, material[2]);
	spec 	= 	mix(spec, 	texture(specularTex,  vec3(uv, material[1])).r , material[2]);
	texNormal = mix(texNormal, texture(normalTex,  vec3(uv, material[1])).rgb, material[2]);	
	texNormal = normalize(texNormal*2.0-1.0);


	vec3 viewDir = normalize(cameraPos - position);
	vec3 halfwayDir = normalize(lightDir + viewDir);
	spec = pow(max(dot(texNormal, halfwayDir), 0.0), spec);
	color = vec4(ambient*albedo+spec,1.0);

}