/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014                                                                    *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
 * software and associated documentation files (the "Software"), to deal in the Software *
 * without restriction, including without limitation the rights to use, copy, modify,    *
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
 * permit persons to whom the Software is furnished to do so, subject to the following   *
 * conditions:                                                                           *
 *                                                                                       *
 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
 *                                                                                       *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
 ****************************************************************************************/

#version 430

uniform vec4 campos;
uniform vec4 objpos;
//uniform vec3 camdir; // add this for specular


uniform float time;
uniform sampler2D texture1;
uniform sampler2D texture2;

in vec2 vs_st;
in vec4 vs_normal;
in vec4 vs_position;

in vec4 ProjTexCoord;
uniform vec3 boresight;

#include "ABuffer/abufferStruct.hglsl"
#include "ABuffer/abufferAddToBuffer.hglsl"
#include "PowerScaling/powerScaling_fs.hglsl"

//#include "PowerScaling/powerScaling_vs.hglsl"
void main()
{
	vec4 position = vs_position;
	float depth = pscDepth(position);
	vec4 diffuse = texture(texture1, vs_st);
	
	// directional lighting
	vec3 origin = vec3(0.0);
	vec4 spec = vec4(0.0);
	
	vec3 n = normalize(vs_normal.xyz);
	//vec3 e = normalize(camdir);
	vec3 l_pos = vec3(0.0); // sun.
	vec3 l_dir = normalize(l_pos-objpos.xyz);
	float terminatorBright = 0.8;
	float intensity = min(max(5*dot(n,l_dir), terminatorBright), 1);
	
	float shine = 0.0001;

	vec4 specular = vec4(0.1);
	vec4 ambient = vec4(0.f,0.f,0.f,1);
	/* Specular
	if(intensity > 0.f){
		// halfway vector
		vec3 h = normalize(l_dir + e);
		// specular factor
		float intSpec = max(dot(h,n),0.0);
		spec = specular * pow(intSpec, shine);
	}
	*/
	//diffuse = max(intensity * diffuse, ambient);
	
	// PROJECTIVE TEXTURE
	vec4 projTexColor = textureProj(texture2, ProjTexCoord);
	vec4 shaded = max(intensity * diffuse, ambient);
		if (ProjTexCoord[0] > 0.0 || 
			ProjTexCoord[1] > 0.0 ||
			ProjTexCoord[0] < ProjTexCoord[2] || 
			ProjTexCoord[1] < ProjTexCoord[2]){
			diffuse = shaded;
		}else if(dot(n,boresight) < 0 &&
		         (projTexColor.w != 0)){// frontfacing
			diffuse = projTexColor;//*0.5f + 0.5f*shaded;
		}else{
			diffuse = shaded;
		}
	
	ABufferStruct_t frag = createGeometryFragment(diffuse, position, depth);
	addToBuffer(frag);

	discard;
}