shader_type spatial;

render_mode unshaded;

uniform sampler2D colorA :hint_albedo;
uniform sampler2D colorB :hint_albedo;
uniform sampler2D colorC :hint_albedo;

uniform sampler2D normalA :hint_normal;
uniform sampler2D normalB :hint_normal;
uniform sampler2D normalC :hint_normal;

/////////////////////////////
/*MASKING:
	R = METALIC
	G = ROUGHTNESS
	B = HEIGHT
*/
uniform sampler2D maskingA;
uniform sampler2D maskingB;
uniform sampler2D maskingC;
////////////////////////////
/*VERTEX COLOR:
	R = textureA
	G = textureB
	B = textureC
*/
varying vec4 vertexColor;

void vertex() {
vertexColor = COLOR;
}

vec3 hlerp(vec4 texture1, float a1, vec4 texture2, float a2)
{
    float depth = 0.2;
    float ma = max(texture1.a + a1, texture2.a + a2) - depth;

    float b1 = max(texture1.a + a1 - ma, 0);
    float b2 = max(texture2.a + a2 - ma, 0);

    return (texture1.rgb * b1 + texture2.rgb * b2) / (b1 + b2);
}



float vColAdd (float a, float b){
	float result = max(a + b, 0);
}


void fragment(){
	vec4 colA = texture(colorA, UV);
	vec4 colB = texture(colorB, UV);
	vec4 colC = texture(colorC, UV);

	vec4 norA = texture(normalA, UV);
	vec4 norB = texture(normalB, UV);
	vec4 norC = texture(normalC, UV);

	vec4 maskA = texture(maskingA, UV);
	vec4 maskB = texture(maskingB, UV);
	vec4 maskC = texture(maskingC, UV);

//	ALBEDO = hlerp(colA, vertexColor.r, colB, vertexColor.g).rgb;

//	ALBEDO = colA.rgb;

	NORMAL = hlerp(norA, vertexColor.r, norB, vertexColor.g).rgb;
	ROUGHNESS = 1f;

}