shader3/res/shader/zpdd_inverse.fs

varying vec2 V_Texcoord;

uniform sampler2D U_BaseTexture;
uniform sampler2D U_BlendTexture;

void main()
{
	vec4 baseColor = texture2D(U_BaseTexture, V_Texcoord);
	vec4 blendColor = texture2D(U_BlendTexture, V_Texcoord);
	gl_FragColor = vec4(1.0) - ((vec4(1.0)-blendColor) * (vec4(1.0)-baseColor));
}