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uniform mat4 ModelWorld4x4;
uniform vec3 CameraPos;

mat3 GetLinearPart( mat4 m )
{
	mat3 result;
	
	result[0][0] = m[0][0]; 
	result[0][1] = m[0][1]; 
	result[0][2] = m[0][2]; 

	result[1][0] = m[1][0]; 
	result[1][1] = m[1][1]; 
	result[1][2] = m[1][2]; 
	
	result[2][0] = m[2][0]; 
	result[2][1] = m[2][1]; 
	result[2][2] = m[2][2]; 
	
	return result;
}		
			   
void main()
{	
	gl_Position = ftransform();		
	
	// Color map texture coordinates. 
	// Increase a little bit the tiling by 2.
	gl_TexCoord[0] = gl_MultiTexCoord0 * 2.0;
	
	mat3 ModelWorld3x3 = GetLinearPart( ModelWorld4x4 );
	
	// find world space position.
	vec4 WorldPos = ModelWorld4x4 *  gl_Vertex;	
	
	// find world space normal.
	vec3 N = normalize( ModelWorld3x3 * gl_Normal ); 
	
	// find world space eye vector.
	vec3 E = normalize( WorldPos.xyz - CameraPos.xyz );	
	
	// calculate the reflection vector in world space.
	gl_TexCoord[1].xyz = reflect( E, N ); 
}

	
uniform samplerCube cubeMap;
uniform sampler2D colorMap;

const float reflect_factor = 0.5;

void main (void)
{
	vec4 output_color;
	
	// Perform a simple 2D texture look up.
	vec3 base_color = texture2D(colorMap, gl_TexCoord[0].xy).rgb;
	
	// Perform a cube map look up.
	vec3 cube_color = textureCube(cubeMap, gl_TexCoord[1].xyz).rgb;

	// Write the final pixel.
	gl_FragColor = vec4( mix(base_color, cube_color, reflect_factor), 1.0);
}