#version 430
out vec4 FragColor;
  
in vec2 TexCoords;

uniform sampler2D gPosition;
uniform sampler2D gNormal;
uniform sampler2D gAlbedoSpec;

subroutine vec4 shading_t();
subroutine uniform shading_t Shading;

subroutine(shading_t)
vec4 DisplayAlbedo()
{
	vec3 Albedo = texture(gAlbedoSpec, TexCoords).rgb;	
	return vec4(Albedo, 0);
}

subroutine(shading_t)
vec4 DisplayPositions()
{
	vec3 FragPos = texture(gPosition, TexCoords).rgb;
	return vec4(FragPos, 0);
}

subroutine(shading_t)
vec4 DisplayNormals()
{
	vec3 Normal = texture(gNormal, TexCoords).rgb;
	return vec4(Normal, 0);
}

void main(void)
{	      
	FragColor = Shading();
}