namespace XCEngine
{
    public enum FullscreenPassType
    {
        ColorScale = 0,
        ShaderVector = 1
    }

    public struct FullscreenPassDescriptor
    {
        public FullscreenPassType type;
        public string shaderPath;
        public string passName;
        public Vector4 vectorPayload;

        public static FullscreenPassDescriptor CreateColorScale(
            Vector4 colorScale)
        {
            FullscreenPassDescriptor descriptor = new FullscreenPassDescriptor();
            descriptor.type = FullscreenPassType.ColorScale;
            descriptor.shaderPath = string.Empty;
            descriptor.passName = string.Empty;
            descriptor.vectorPayload = colorScale;
            return descriptor;
        }

        public static FullscreenPassDescriptor CreateShaderVector(
            string shaderPath,
            Vector4 vectorPayload,
            string passName = null)
        {
            FullscreenPassDescriptor descriptor = new FullscreenPassDescriptor();
            descriptor.type = FullscreenPassType.ShaderVector;
            descriptor.shaderPath = shaderPath ?? string.Empty;
            descriptor.passName = passName ?? string.Empty;
            descriptor.vectorPayload = vectorPayload;
            return descriptor;
        }

        public bool IsValid()
        {
            switch (type)
            {
                case FullscreenPassType.ColorScale:
                    return true;
                case FullscreenPassType.ShaderVector:
                    return !string.IsNullOrEmpty(shaderPath);
                default:
                    return false;
            }
        }
    }
}