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using UnityEngine.Rendering;
namespace UnityEngine.PostProcessing;
public sealed class AmbientOcclusionComponent : PostProcessingComponentCommandBuffer<AmbientOcclusionModel>
{
private static class Uniforms
{
internal static readonly int _Intensity = Shader.PropertyToID("_Intensity");
internal static readonly int _Radius = Shader.PropertyToID("_Radius");
internal static readonly int _FogParams = Shader.PropertyToID("_FogParams");
internal static readonly int _Downsample = Shader.PropertyToID("_Downsample");
internal static readonly int _SampleCount = Shader.PropertyToID("_SampleCount");
internal static readonly int _OcclusionTexture1 = Shader.PropertyToID("_OcclusionTexture1");
internal static readonly int _OcclusionTexture2 = Shader.PropertyToID("_OcclusionTexture2");
internal static readonly int _OcclusionTexture = Shader.PropertyToID("_OcclusionTexture");
internal static readonly int _MainTex = Shader.PropertyToID("_MainTex");
internal static readonly int _TempRT = Shader.PropertyToID("_TempRT");
}
private enum OcclusionSource
{
DepthTexture,
DepthNormalsTexture,
GBuffer
}
private const string k_BlitShaderString = "Hidden/Post FX/Blit";
private const string k_ShaderString = "Hidden/Post FX/Ambient Occlusion";
private readonly RenderTargetIdentifier[] m_MRT = new RenderTargetIdentifier[2]
{
BuiltinRenderTextureType.GBuffer0,
BuiltinRenderTextureType.CameraTarget
};
private OcclusionSource occlusionSource
{
get
{
if (context.isGBufferAvailable && !base.model.settings.forceForwardCompatibility)
{
return OcclusionSource.GBuffer;
}
if (base.model.settings.highPrecision && (!context.isGBufferAvailable || base.model.settings.forceForwardCompatibility))
{
return OcclusionSource.DepthTexture;
}
return OcclusionSource.DepthNormalsTexture;
}
}
private bool ambientOnlySupported => context.isHdr && base.model.settings.ambientOnly && context.isGBufferAvailable && !base.model.settings.forceForwardCompatibility;
public override bool active => base.model.enabled && base.model.settings.intensity > 0f && !context.interrupted;
public override DepthTextureMode GetCameraFlags()
{
DepthTextureMode depthTextureMode = DepthTextureMode.None;
if (occlusionSource == OcclusionSource.DepthTexture)
{
depthTextureMode |= DepthTextureMode.Depth;
}
if (occlusionSource != OcclusionSource.GBuffer)
{
depthTextureMode |= DepthTextureMode.DepthNormals;
}
return depthTextureMode;
}
public override string GetName()
{
return "Ambient Occlusion";
}
public override CameraEvent GetCameraEvent()
{
return (!ambientOnlySupported || context.profile.debugViews.IsModeActive(BuiltinDebugViewsModel.Mode.AmbientOcclusion)) ? CameraEvent.BeforeImageEffectsOpaque : CameraEvent.BeforeReflections;
}
public override void PopulateCommandBuffer(CommandBuffer cb)
{
AmbientOcclusionModel.Settings settings = base.model.settings;
Material mat = context.materialFactory.Get("Hidden/Post FX/Blit");
Material material = context.materialFactory.Get("Hidden/Post FX/Ambient Occlusion");
material.shaderKeywords = null;
material.SetFloat(Uniforms._Intensity, settings.intensity);
material.SetFloat(Uniforms._Radius, settings.radius);
material.SetFloat(Uniforms._Downsample, (!settings.downsampling) ? 1f : 0.5f);
material.SetInt(Uniforms._SampleCount, (int)settings.sampleCount);
if (!context.isGBufferAvailable && RenderSettings.fog)
{
material.SetVector(Uniforms._FogParams, new Vector3(RenderSettings.fogDensity, RenderSettings.fogStartDistance, RenderSettings.fogEndDistance));
switch (RenderSettings.fogMode)
{
case FogMode.Linear:
material.EnableKeyword("FOG_LINEAR");
break;
case FogMode.Exponential:
material.EnableKeyword("FOG_EXP");
break;
case FogMode.ExponentialSquared:
material.EnableKeyword("FOG_EXP2");
break;
}
}
else
{
material.EnableKeyword("FOG_OFF");
}
int width = context.width;
int height = context.height;
int num = ((!settings.downsampling) ? 1 : 2);
int occlusionTexture = Uniforms._OcclusionTexture1;
cb.GetTemporaryRT(occlusionTexture, width / num, height / num, 0, FilterMode.Bilinear, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
cb.Blit(null, occlusionTexture, material, (int)occlusionSource);
int occlusionTexture2 = Uniforms._OcclusionTexture2;
cb.GetTemporaryRT(occlusionTexture2, width, height, 0, FilterMode.Bilinear, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
cb.SetGlobalTexture(Uniforms._MainTex, occlusionTexture);
cb.Blit(occlusionTexture, occlusionTexture2, material, (occlusionSource != OcclusionSource.GBuffer) ? 3 : 4);
cb.ReleaseTemporaryRT(occlusionTexture);
occlusionTexture = Uniforms._OcclusionTexture;
cb.GetTemporaryRT(occlusionTexture, width, height, 0, FilterMode.Bilinear, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
cb.SetGlobalTexture(Uniforms._MainTex, occlusionTexture2);
cb.Blit(occlusionTexture2, occlusionTexture, material, 5);
cb.ReleaseTemporaryRT(occlusionTexture2);
if (context.profile.debugViews.IsModeActive(BuiltinDebugViewsModel.Mode.AmbientOcclusion))
{
cb.SetGlobalTexture(Uniforms._MainTex, occlusionTexture);
cb.Blit(occlusionTexture, BuiltinRenderTextureType.CameraTarget, material, 8);
context.Interrupt();
}
else if (ambientOnlySupported)
{
cb.SetRenderTarget(m_MRT, BuiltinRenderTextureType.CameraTarget);
cb.DrawMesh(GraphicsUtils.quad, Matrix4x4.identity, material, 0, 7);
}
else
{
RenderTextureFormat format = ((!context.isHdr) ? RenderTextureFormat.Default : RenderTextureFormat.DefaultHDR);
int tempRT = Uniforms._TempRT;
cb.GetTemporaryRT(tempRT, context.width, context.height, 0, FilterMode.Bilinear, format);
cb.Blit(BuiltinRenderTextureType.CameraTarget, tempRT, mat, 0);
cb.SetGlobalTexture(Uniforms._MainTex, tempRT);
cb.Blit(tempRT, BuiltinRenderTextureType.CameraTarget, material, 6);
cb.ReleaseTemporaryRT(tempRT);
}
cb.ReleaseTemporaryRT(occlusionTexture);
}
}
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