rj-action-library/External/Imposter/materials/normal_baker.gdshader

shader_type spatial;
render_mode blend_mix,depth_draw_opaque,cull_disabled,diffuse_burley,specular_schlick_ggx;
uniform vec4 albedo_color : source_color;
uniform sampler2D albedo_texture : source_color;
uniform sampler2D normal_texture : source_color;

uniform bool use_normalmap = false;
uniform bool use_alpha_texture = false;

uniform float alpha_scissor_threshold :  hint_range(0,1);
uniform float normal_scale :  hint_range(-5,5);

uniform vec3 uv1_scale;
uniform vec3 uv1_offset;


void vertex()
{
	UV = UV * uv1_scale.xy + uv1_offset.xy;
}

void fragment()
{
	vec2 base_uv = UV;
	vec4 albedo = texture( albedo_texture, base_uv ) * albedo_color;
	vec4 normal_tex = texture( normal_texture, base_uv );
	// 0.5 + -1.0 == -1.0 + 0.5
	//ALBEDO = vec3(1.0 - NORMAL.y, 1.0 - NORMAL.x, - NORMAL.z)* 0.5;
	if ( use_normalmap )
	{
		vec3 normalmap;
		normalmap.xy = normal_tex.xy * 2.0 - 1.0;
		normalmap.z = sqrt(max(0.0, 1.0 - dot(normalmap.xy, normalmap.xy)));
		NORMAL = normalize(mix(NORMAL, TANGENT * normalmap.x + BINORMAL * normalmap.y + NORMAL * normalmap.z, normal_scale));
	}


	ALBEDO = vec3( -NORMAL.x, NORMAL.y, -NORMAL.z) * 0.5 + 0.5;

	if ( use_alpha_texture )
	{
		ALPHA = albedo.a;
		ALPHA_SCISSOR_THRESHOLD = alpha_scissor_threshold;
	}

}