namespace UnityEngine.PostProcessing
|
{
|
public sealed class EyeAdaptationComponent : PostProcessingComponentRenderTexture<EyeAdaptationModel>
|
{
|
static class Uniforms
|
{
|
internal static readonly int _Params = Shader.PropertyToID("_Params");
|
internal static readonly int _Speed = Shader.PropertyToID("_Speed");
|
internal static readonly int _ScaleOffsetRes = Shader.PropertyToID("_ScaleOffsetRes");
|
internal static readonly int _ExposureCompensation = Shader.PropertyToID("_ExposureCompensation");
|
internal static readonly int _AutoExposure = Shader.PropertyToID("_AutoExposure");
|
internal static readonly int _DebugWidth = Shader.PropertyToID("_DebugWidth");
|
}
|
|
ComputeShader m_EyeCompute;
|
ComputeBuffer m_HistogramBuffer;
|
|
readonly RenderTexture[] m_AutoExposurePool = new RenderTexture[2];
|
int m_AutoExposurePingPing;
|
RenderTexture m_CurrentAutoExposure;
|
|
RenderTexture m_DebugHistogram;
|
|
static uint[] s_EmptyHistogramBuffer;
|
|
bool m_FirstFrame = true;
|
|
// Don't forget to update 'EyeAdaptation.cginc' if you change these values !
|
const int k_HistogramBins = 64;
|
const int k_HistogramThreadX = 16;
|
const int k_HistogramThreadY = 16;
|
|
public override bool active
|
{
|
get
|
{
|
return model.enabled
|
&& SystemInfo.supportsComputeShaders
|
&& !context.interrupted;
|
}
|
}
|
|
public void ResetHistory()
|
{
|
m_FirstFrame = true;
|
}
|
|
public override void OnEnable()
|
{
|
m_FirstFrame = true;
|
}
|
|
public override void OnDisable()
|
{
|
foreach (var rt in m_AutoExposurePool)
|
GraphicsUtils.Destroy(rt);
|
|
if (m_HistogramBuffer != null)
|
m_HistogramBuffer.Release();
|
|
m_HistogramBuffer = null;
|
|
if (m_DebugHistogram != null)
|
m_DebugHistogram.Release();
|
|
m_DebugHistogram = null;
|
}
|
|
Vector4 GetHistogramScaleOffsetRes()
|
{
|
var settings = model.settings;
|
float diff = settings.logMax - settings.logMin;
|
float scale = 1f / diff;
|
float offset = -settings.logMin * scale;
|
return new Vector4(scale, offset, Mathf.Floor(context.width / 2f), Mathf.Floor(context.height / 2f));
|
}
|
|
public Texture Prepare(RenderTexture source, Material uberMaterial)
|
{
|
var settings = model.settings;
|
|
// Setup compute
|
if (m_EyeCompute == null)
|
m_EyeCompute = Resources.Load<ComputeShader>("Shaders/EyeHistogram");
|
|
var material = context.materialFactory.Get("Hidden/Post FX/Eye Adaptation");
|
material.shaderKeywords = null;
|
|
if (m_HistogramBuffer == null)
|
m_HistogramBuffer = new ComputeBuffer(k_HistogramBins, sizeof(uint));
|
|
if (s_EmptyHistogramBuffer == null)
|
s_EmptyHistogramBuffer = new uint[k_HistogramBins];
|
|
// Downscale the framebuffer, we don't need an absolute precision for auto exposure and it
|
// helps making it more stable
|
var scaleOffsetRes = GetHistogramScaleOffsetRes();
|
|
var rt = context.renderTextureFactory.Get((int)scaleOffsetRes.z, (int)scaleOffsetRes.w, 0, source.format);
|
Graphics.Blit(source, rt);
|
|
if (m_AutoExposurePool[0] == null || !m_AutoExposurePool[0].IsCreated())
|
m_AutoExposurePool[0] = new RenderTexture(1, 1, 0, RenderTextureFormat.RFloat);
|
|
if (m_AutoExposurePool[1] == null || !m_AutoExposurePool[1].IsCreated())
|
m_AutoExposurePool[1] = new RenderTexture(1, 1, 0, RenderTextureFormat.RFloat);
|
|
// Clears the buffer on every frame as we use it to accumulate luminance values on each frame
|
m_HistogramBuffer.SetData(s_EmptyHistogramBuffer);
|
|
// Gets a log histogram
|
int kernel = m_EyeCompute.FindKernel("KEyeHistogram");
|
m_EyeCompute.SetBuffer(kernel, "_Histogram", m_HistogramBuffer);
|
m_EyeCompute.SetTexture(kernel, "_Source", rt);
|
m_EyeCompute.SetVector("_ScaleOffsetRes", scaleOffsetRes);
|
m_EyeCompute.Dispatch(kernel, Mathf.CeilToInt(rt.width / (float)k_HistogramThreadX), Mathf.CeilToInt(rt.height / (float)k_HistogramThreadY), 1);
|
|
// Cleanup
|
context.renderTextureFactory.Release(rt);
|
|
// Make sure filtering values are correct to avoid apocalyptic consequences
|
const float minDelta = 1e-2f;
|
settings.highPercent = Mathf.Clamp(settings.highPercent, 1f + minDelta, 99f);
|
settings.lowPercent = Mathf.Clamp(settings.lowPercent, 1f, settings.highPercent - minDelta);
|
|
// Compute auto exposure
|
material.SetBuffer("_Histogram", m_HistogramBuffer); // No (int, buffer) overload for SetBuffer ?
|
material.SetVector(Uniforms._Params, new Vector4(settings.lowPercent * 0.01f, settings.highPercent * 0.01f, Mathf.Exp(settings.minLuminance * 0.69314718055994530941723212145818f), Mathf.Exp(settings.maxLuminance * 0.69314718055994530941723212145818f)));
|
material.SetVector(Uniforms._Speed, new Vector2(settings.speedDown, settings.speedUp));
|
material.SetVector(Uniforms._ScaleOffsetRes, scaleOffsetRes);
|
material.SetFloat(Uniforms._ExposureCompensation, settings.keyValue);
|
|
if (settings.dynamicKeyValue)
|
material.EnableKeyword("AUTO_KEY_VALUE");
|
|
if (m_FirstFrame || !Application.isPlaying)
|
{
|
// We don't want eye adaptation when not in play mode because the GameView isn't
|
// animated, thus making it harder to tweak. Just use the final audo exposure value.
|
m_CurrentAutoExposure = m_AutoExposurePool[0];
|
Graphics.Blit(null, m_CurrentAutoExposure, material, (int)EyeAdaptationModel.EyeAdaptationType.Fixed);
|
|
// Copy current exposure to the other pingpong target to avoid adapting from black
|
Graphics.Blit(m_AutoExposurePool[0], m_AutoExposurePool[1]);
|
}
|
else
|
{
|
int pp = m_AutoExposurePingPing;
|
var src = m_AutoExposurePool[++pp % 2];
|
var dst = m_AutoExposurePool[++pp % 2];
|
Graphics.Blit(src, dst, material, (int)settings.adaptationType);
|
m_AutoExposurePingPing = ++pp % 2;
|
m_CurrentAutoExposure = dst;
|
}
|
|
// Generate debug histogram
|
if (context.profile.debugViews.IsModeActive(BuiltinDebugViewsModel.Mode.EyeAdaptation))
|
{
|
if (m_DebugHistogram == null || !m_DebugHistogram.IsCreated())
|
{
|
m_DebugHistogram = new RenderTexture(256, 128, 0, RenderTextureFormat.ARGB32)
|
{
|
filterMode = FilterMode.Point,
|
wrapMode = TextureWrapMode.Clamp
|
};
|
}
|
|
material.SetFloat(Uniforms._DebugWidth, m_DebugHistogram.width);
|
Graphics.Blit(null, m_DebugHistogram, material, 2);
|
}
|
|
m_FirstFrame = false;
|
return m_CurrentAutoExposure;
|
}
|
|
public void OnGUI()
|
{
|
if (m_DebugHistogram == null || !m_DebugHistogram.IsCreated())
|
return;
|
|
var rect = new Rect(context.viewport.x * Screen.width + 8f, 8f, m_DebugHistogram.width, m_DebugHistogram.height);
|
GUI.DrawTexture(rect, m_DebugHistogram);
|
}
|
}
|
}
|
