#version 130
out vec4 outpix;
uniform vec3 campos;
uniform vec3 lightpos;
uniform sampler2D tex;
uniform sampler2D elev;
//varing blends them it is transformed to world space
varying vec4 fragpos;
varying vec4 fragnormal;
varying vec2 fragtexcoord;
void main() 
{
	vec4 elevpix = texture(elev, fragtexcoord);
	vec3 lightnormal = normalize((lightpos - vec3(fragpos.x, fragpos.y, fragpos.z)));
	float diffuse = dot(lightnormal, vec3(fragnormal.x, fragnormal.y, fragnormal.z));
	if (diffuse < 0.0) {
		diffuse = 0.0;
	}
	vec3 camnormal = normalize(campos - vec3(fragpos.x, fragpos.y, fragpos.z));
	float reflect = dot(camnormal, fragnormal.xyz);
	diffuse = pow(diffuse, 2.0);
	reflect = pow(reflect, 2.0);
	float light = .4 * reflect + .6 * diffuse;
	vec4 texpix = texture(tex, fragtexcoord);
	//this should be the vertex in camera space without the w value
	//outpix = gl_FragCoord;
	outpix = texpix;
	//outpix = vec4(light * 1.0,light *  1.0,light * 1.0, 1.0);
	//outpix = vec4(fragpos.x ,fragpos.y ,fragpos.z, 0.5);
	//outpix = vec4(fragnormal.x, fragnormal.y, fragnormal.z, 0.5);
}