/Utilities/Graphics/ShaderFeatures/ShaderConstants.cs

using Delta.Utilities.Datatypes;



namespace Delta.Utilities.Graphics.ShaderFeatures

{

	/// <summary>

	/// Shader constants, not only needed for the Content and as default values

	/// for the shader classes in Graphics, but also for the default fallback

	/// values for many of the shader feature classes in this namespace.

	/// </summary>

	public class ShaderConstants

	{

		#region Constants

		/// <summary>

		/// Default colors are 0.15 for ambient and 1.0 for diffuse and specular.

		/// </summary>

		public static readonly Color DefaultAmbientColor =

			new Color(0.15f, 0.15f, 0.15f);



		/// <summary>

		/// Default diffuse color is almost white (90%)

		/// </summary>

		public static readonly Color DefaultDiffuseColor =

			new Color(0.9f, 0.9f, 0.9f);



		/// <summary>

		/// Default specular color is always white

		/// </summary>

		public static readonly Color DefaultSpecularColor = Color.White;



		/// <summary>

		/// Default specular power (4 now for better fresnel, was 24 before)

		/// </summary>

		public const float DefaultSpecularPower = 10.0f; //13.0f;//16.0f;//24.0f;



		/// <summary>

		/// Default fresnel power if the shader for this material does fresnel,

		/// fresnel bias is 0 (or bias in the shader) and the factor is 1.0 too.

		/// Note: Now in a pre-calculated lut texture, not longer a parameter!

		/// </summary>

		public const float DefaultFresnelPower = 4.0f; //7.0f;//4.0f;



		/// <summary>

		/// Default fresnel factor. Fresnel * FresnelFactor.

		/// Note: Now in a pre-calculated lut texture, not longer a parameter!

		/// </summary>

		public const float DefaultFresnelFactor = 2.0f; //8.0f;



		/// <summary>

		/// Default parallax offset amount in pixels for a 1024x1024 texture.

		/// 16 means that we will offset -16 to +16 pixels in the texture (which

		/// is a lot, you really need smooth transitions to make this look ok).

		/// Note: For a 2048x2048 texture it would be -32 to +32 pixels, for

		/// a 512x512 texture it would be -8 to +8 because the formula is always

		/// the same: 1024.0 / ParallaxAmount. Note: Increased a bit to 27.0f

		/// because now it is only used on floors, old value: 16.0f.

		/// </summary>

		public const float DefaultParallaxAmount = 27.0f; //20.0f;//16.0f;



		/// <summary>

		/// Minimum ambient value.

		/// </summary>

		public const float DefaultMinAmbientValue = 0.25f; //0.15f;



		/// <summary>

		/// Value for alpha test.

		/// The default value is normally 0.66.

		/// </summary>

		public const float DefaultAlphaTestValue = 0.33f;



		/// <summary>

		/// Default fog color. 133, 37, 12 + 0.075 brightness

		/// </summary>

		public static readonly Color DefaultFogColor = new Color(

			// Mix the old fog color with white to make fog not so strong,

			// mipmap fog is not very great ..

			(0.52f + 0.15f + 1.0f) / 2.0f,

			(0.145f + 0.15f + 1.0f) / 2.0f,

			(0.047f + 0.15f + 1.0f) / 2.0f, 1.0f);



		/// <summary>

		/// Default fog start.

		/// </summary>

		public const float DefaultFogStart = 20.0f;



		/// <summary>

		/// Fog end.

		/// </summary>

		public const float DefaultFogEnd = 90.0f;



		/// <summary>

		/// Maximum fog value.

		/// </summary>

		public const float DefaultMaxFogValue = 0.9f;



		/// <summary>

		/// Minimum fog value.

		/// </summary>

		public const float DefaultMinFogValue = 0.15f;



		/// <summary>

		/// Maximal bones count that we can support currently = 36.

		/// But you can change that value dynamically via the Content Settings :)

		/// </summary>

		public const int MaxBonesCount = 36;



		/*currently unused, should be in the shadow classes anyway!

		/// <summary>

		/// Default shadow that will generates in shader generator.

		/// Currently set to the fastest version: Projection shadows, but

		/// can be changed before generating content to different values.

		/// </summary>

		public static ShadowType DefaultShadowType = ShadowType.Projection;

		 */



		/// <summary>

		/// Default shadow size. Normally 512x512. The size is useful to get 

		/// the pixel size in shader (1.0 / 512.0).

		/// </summary>

		public static readonly Size DefaultShadowSize =

			//could be too much for the Tegra:

			new Size(512, 512);



		//new Size(256, 256);

		/// <summary>

		/// Default shadow color. Using for the shadow map generation.

		/// 0.33 is pretty dark (0.5 is too weak however), 0.0 is black and

		/// will usually not look very well for bright scenes (only in Doom3 ^^)

		/// </summary>

		public static readonly Color DefaultShadowColor =

			new Color(0.33f, 0.33f, 0.33f, 1.0f);

		#endregion

	}

}