111 lines
3.8 KiB
C#
111 lines
3.8 KiB
C#
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using UnityEngine;
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using NativeBlendMode = UnityEngine.Rendering.BlendMode;
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namespace FairyGUI
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{
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/*关于BlendMode.Off, 这种模式相当于Blend Off指令的效果。当然，在着色器里使用Blend Off指令可以获得更高的效率，
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但因为Image着色器本身就有多个关键字，复制一个这样的着色器代价太大，所有为了节省Shader数量便增加了这样一种模式，也是可以接受的。
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*/
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/// <summary>
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///
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/// </summary>
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public enum BlendMode
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{
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Normal,
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None,
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Add,
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Multiply,
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Screen,
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Erase,
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Mask,
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Below,
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Off,
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One_OneMinusSrcAlpha,
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Custom1,
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Custom2,
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Custom3
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}
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/// <summary>
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///
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/// </summary>
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public class BlendModeUtils
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{
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public class BlendFactor
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{
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public NativeBlendMode srcFactor;
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public NativeBlendMode dstFactor;
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public bool pma;
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public BlendFactor(NativeBlendMode srcFactor, NativeBlendMode dstFactor, bool pma = false)
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{
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this.srcFactor = srcFactor;
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this.dstFactor = dstFactor;
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this.pma = pma;
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}
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}
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//Source指的是被计算的颜色，Destination是已经在屏幕上的颜色。
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//混合结果=Source * factor1 + Destination * factor2
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public static BlendFactor[] Factors = new BlendFactor[] {
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//Normal
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new BlendFactor(NativeBlendMode.SrcAlpha, NativeBlendMode.OneMinusSrcAlpha),
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//None
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new BlendFactor(NativeBlendMode.One, NativeBlendMode.One),
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//Add
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new BlendFactor(NativeBlendMode.SrcAlpha, NativeBlendMode.One),
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//Multiply
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new BlendFactor(NativeBlendMode.DstColor, NativeBlendMode.OneMinusSrcAlpha, true),
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//Screen
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new BlendFactor(NativeBlendMode.One, NativeBlendMode.OneMinusSrcColor, true),
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//Erase
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new BlendFactor(NativeBlendMode.Zero, NativeBlendMode.OneMinusSrcAlpha),
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//Mask
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new BlendFactor(NativeBlendMode.Zero, NativeBlendMode.SrcAlpha),
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//Below
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new BlendFactor(NativeBlendMode.OneMinusDstAlpha, NativeBlendMode.DstAlpha),
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//Off
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new BlendFactor(NativeBlendMode.One, NativeBlendMode.Zero),
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//One_OneMinusSrcAlpha
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new BlendFactor(NativeBlendMode.One, NativeBlendMode.OneMinusSrcAlpha),
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//Custom1
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new BlendFactor(NativeBlendMode.SrcAlpha, NativeBlendMode.OneMinusSrcAlpha),
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//Custom2
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new BlendFactor(NativeBlendMode.SrcAlpha, NativeBlendMode.OneMinusSrcAlpha),
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//Custom3
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new BlendFactor(NativeBlendMode.SrcAlpha, NativeBlendMode.OneMinusSrcAlpha)
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};
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/// <summary>
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///
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/// </summary>
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/// <param name="mat"></param>
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/// <param name="blendMode"></param>
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public static void Apply(Material mat, BlendMode blendMode)
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{
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BlendFactor bf = Factors[(int)blendMode];
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mat.SetFloat(ShaderConfig.ID_BlendSrcFactor, (float)bf.srcFactor);
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mat.SetFloat(ShaderConfig.ID_BlendDstFactor, (float)bf.dstFactor);
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if (bf.pma)
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mat.SetFloat(ShaderConfig.ID_ColorOption, 1);
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else
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mat.SetFloat(ShaderConfig.ID_ColorOption, 0);
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="blendMode"></param>
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/// <param name="srcFactor"></param>
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/// <param name="dstFactor"></param>
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public static void Override(BlendMode blendMode, NativeBlendMode srcFactor, NativeBlendMode dstFactor)
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{
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BlendFactor bf = Factors[(int)blendMode];
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bf.srcFactor = srcFactor;
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bf.dstFactor = dstFactor;
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}
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}
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}
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