Unity_URP_Rendering Debugger 调试入门之解构环境光反射光等Lit光照模型的代码逻辑

Posted 2022-01-11 avi9111

目录

光照模型

代码代码

还是从 Panel 代码入手

明显得，各种光照用了mask 做叠加（多选，左移进位)

设置 mask 之后，是在哪里注入debug呢？

同样地不管 fog 的开关，很快就找到 mask lit 开关的 debug 实现

分别看看各种光的应用

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光照模型

明显区分了 mainlit, emission, global等光线

代码代码

还是从 Panel 代码入手

        internal void Reset()
        
            m_Settings.Clear();

            CommonSettings = Add(new DebugDisplaySettingsCommon());
            MaterialSettings = Add(new DebugDisplaySettingsMaterial());
            LightingSettings = Add(new DebugDisplaySettingsLighting());
            RenderingSettings = Add(new DebugDisplaySettingsRendering());
        

明显得，各种光照用了mask 做叠加（多选，左移进位)

/// <summary>
    /// Debug mode that allows selective disabling of individual lighting components.
    /// </summary>
    [GenerateHLSL, Flags]
    public enum DebugLightingFeatureFlags
    
        /// <summary>The debug mode is not active.</summary>
        None,
        /// <summary>Display contribution from global illumination.</summary>
        GlobalIllumination = 0x1,
        /// <summary>Display contribution from the main light.</summary>
        MainLight = 0x2,
        /// <summary>Display contribution from additional lights.</summary>
        AdditionalLights = 0x4,
        /// <summary>Display contribution from vertex lighting.</summary>
        VertexLighting = 0x8,
        /// <summary>Display contribution from emissive objects.</summary>
        Emission = 0x10,
        /// <summary>Display contribution from ambient occlusion.</summary>
        AmbientOcclusion = 0x20,
    

但，暂时怎么设置 mask 不明显

（之后再补上）

设置 mask 之后，是在哪里注入debug呢？

关键还在于：k_DebugLightingFeatureFlagsId

static readonly int k_DebugLightingFeatureFlagsId = Shader.PropertyToID("_DebugLightingFeatureFlags");

 // Lighting settings...
cmd.SetGlobalFloat(k_DebugLightingModeId, (int)LightingSettings.DebugLightingMode);
cmd.SetGlobalInteger(k_DebugLightingFeatureFlagsId, (int)LightingSettings.DebugLightingFeatureFlagsMask);

同样地不管 fog 的开关，很快就找到 mask lit 开关的 debug 实现

in DebuggingCommon.hlsl

bool IsLightingFeatureEnabled(uint bitMask)

    #if defined(DEBUG_DISPLAY)
    return (_DebugLightingFeatureFlags == 0) || ((_DebugLightingFeatureFlags & bitMask) != 0);
    #else
    return true;
    #endif

分别看看各种光的应用

（这次和DebugColor有点不同，确实是剔除光（分层）了。。。。。）

GI光

    if (IsLightingFeatureEnabled(DEBUGLIGHTINGFEATUREFLAGS_GLOBAL_ILLUMINATION))
    
        lightingColor += lightingData.giColor;
    

环境光

    if (IsLightingFeatureEnabled(DEBUGLIGHTINGFEATUREFLAGS_AMBIENT_OCCLUSION))
    
        bakedGI *= aoFactor.indirectAmbientOcclusion;