#ifdef FLAG_DIFFUSE_MAP
uniform sampler2D sBasemap;
#endif

#ifdef FLAG_GLOW_MAP
uniform sampler2D sGlowmap;
#endif

#ifdef FLAG_SPEC_MAP
uniform sampler2D sSpecmap;
#endif

#ifdef FLAG_ENV_MAP
uniform samplerCube sEnvmap;
uniform bool alpha_spec;
out vec3 envReflect;
#endif

#ifdef FLAG_NORMAL_MAP
uniform sampler2D sNormalmap;
out mat3 tbnMatrix;
#endif

#ifdef FLAG_FOG
out float fogDist;
#endif

in vec3 Surface_normal;
in vec4 Position;

out vec4 Diffuse_color 	= vec4(0.0, 0.0, 0.0, 1.0);
out vec4 Surface_Normal = vec4(0.0, 0.0, 0.0, 1.0);
out vec4 Specular_color = vec4(0.0, 0.0, 0.0, 1.0);
out vec4 Glow_color 	= vec4(0.0, 0.0, 0.0, 1.0);

#define SPECULAR_FACTOR 			1.75
#define SPECULAR_ALPHA 				0.1
#define SPEC_FACTOR_NO_SPEC_MAP 	0.6
#define ENV_ALPHA_FACTOR			0.3
#define GLOW_MAP_INTENSITY 			1.5
#define AMBIENT_LIGHT_BOOST 		1.0

void main() {
	vec2 texCoord = gl_TexCoord[0].xy;

  #ifdef FLAG_NORMAL_MAP
	// Normal map - convert from DXT5nm
	vec3 normal;

	normal.rg = (texture2D(sNormalmap, texCoord).ag * 2.0) - 1.0;
    #ifdef FLAG_ENV_MAP
	  vec3 envOffset = vec3(0.0);
	  envOffset.xy = normal.xy;
    #endif
	normal.b = sqrt(1.0 - dot(normal.rg, normal.rg));
	normal = normalize(tbnMatrix * normal);
  #else
	vec3 normal = lNormal;
  #endif

	//Write result to normal buffer
	Surface_Normal = vec4(normal, 1.0);

	//Write diffuse color to difuse buffer
  #ifdef FLAG_DIFFUSE_MAP
	Diffuse_color = texture2D(sBasemap, texCoord);
  #else
	Diffuse_color = gl_Color;
  #endif

	//Write glow color to glow buffer
  #ifdef FLAG_GLOW_MAP
	Glow_Color = texture2D(sGlowmap, texCoord).rgb * GLOW_MAP_INTENSITY;
  #endif

	//Write spec color to spec buffer
  #ifdef FLAG_SPEC_MAP
	Specular_color.rgb += lightSpecular.rgb * (texture2D(sSpecmap, texCoord).rgb * SPECULAR_FACTOR);
	Specular_color.a += (dot(lightSpecular.a, lightSpecular.a) * SPECULAR_ALPHA);
  #else
	Specular_color.rgb += lightSpecular.rgb * (baseColor.rgb * SPEC_FACTOR_NO_SPEC_MAP);
  #endif

	//Write env color to spec as well
  #ifdef FLAG_ENV_MAP
 // Env color
    #ifdef FLAG_NORMAL_MAP
	  vec3 envReflectNM = envReflect + envOffset;
	  vec3 envIntensity = (alpha_spec) ? vec3(texture2D(sSpecmap, texCoord).a) : texture2D(sSpecmap, texCoord).rgb;
	  Specular_color.a += (dot(textureCube(sEnvmap, envReflectNM).rgb, textureCube(sEnvmap, envReflectNM).rgb) * ENV_ALPHA_FACTOR);
	  Specular_color.rgb += textureCube(sEnvmap, envReflectNM).rgb * envIntensity;
    #else
	  vec3 envIntensity = (alpha_spec) ? vec3(texture2D(sSpecmap, texCoord).a) : texture2D(sSpecmap, texCoord).rgb;
	  Specular_color.a += (dot(textureCube(sEnvmap, envReflect).rgb, textureCube(sEnvmap, envReflect).rgb) * ENV_ALPHA_FACTOR);
	  Specular_color.rgb += textureCube(sEnvmap, envReflect).rgb * envIntensity;
    #endif
  #endif

	//Mix fog into diffuse
  #ifdef FLAG_FOG
	Diffuse_color.rgb = mix(Diffuse_color.rgb, gl_Fog.color.rgb, fogDist);
  #endif
}