77 lines
2.7 KiB
C#
77 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using SFML.Graphics;
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namespace Spine.Utils
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{
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public static class SFMLShader
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{
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/// <summary>
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/// 用于非预乘纹理的 fragment shader, 乘上了插值后的透明度用于实现透明度变化(插值预乘), 并且输出预乘后的像素值
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/// </summary>
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private const string FRAGMENT_VertexAlpha =
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"uniform sampler2D t;" +
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"void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
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"p.rgb *= p.a * gl_Color.a;" +
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"gl_FragColor = gl_Color * p; }"
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;
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/// <summary>
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/// 用于预乘纹理的 fragment shader, 乘上了插值后的透明度用于实现透明度变化(插值预乘)
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/// </summary>
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private const string FRAGMENT_VertexAlphaPma =
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"uniform sampler2D t;" +
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"void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
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"p.rgb *= gl_Color.a;" +
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"gl_FragColor = gl_Color * p; }"
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;
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/// <summary>
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/// 预乘转非预乘 fragment shader
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/// </summary>
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private const string FRAGMENT_InvPma =
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"uniform sampler2D t;" +
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"void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
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"if (p.a > 0) p.rgb /= max(max(max(p.r, p.g), p.b), p.a);" +
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"gl_FragColor = p; }"
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;
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/// <summary>
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/// 考虑了顶点透明度变化的着色器, 输入是非预乘纹理像素, 输出是预乘像素
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/// </summary>
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public static Shader? VertexAlpha { get; }
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/// <summary>
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/// 考虑了顶点透明度变化的着色器, 输入和输出均是预乘像素值
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/// </summary>
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public static Shader? VertexAlphaPma { get; }
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/// <summary>
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/// 反预乘着色器, 用于得到正确透明度的非预乘画面
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/// </summary>
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public static Shader? InversePma { get; }
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/// <summary>
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/// 加载 Shader, 可能会存在异常导致着色器加载失败, 会在日志中输出信息
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/// </summary>
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static SFMLShader()
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{
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try
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{
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VertexAlpha = Shader.FromString(null, null, FRAGMENT_VertexAlpha);
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VertexAlphaPma = Shader.FromString(null, null, FRAGMENT_VertexAlphaPma);
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InversePma = Shader.FromString(null, null, FRAGMENT_InvPma);
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}
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catch (Exception ex)
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{
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var logger = NLog.LogManager.GetCurrentClassLogger();
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logger.Trace(ex.ToString());
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logger.Error("Failed to init shaders, {0}", ex.Message);
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}
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}
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}
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}
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