//后处理CommandBuffer
void BuildCommandBuffer()
{
afterOpaque.Clear();
//抓取深度图
if (useDepthTexture)
{
afterOpaque.BeginSample("Copy Depth");
afterOpaque.GetTemporaryRT(ShaderIDs.CameraDepthTex, m_Width, m_Height, 0, FilterMode.Point, RenderTextureFormat.R16);
afterOpaque.CopyDepthTexture(cameraDepthTarget.depthBuffer, ShaderIDs.CameraDepthTex, RuntimeUtilities.copyDepthMat);
afterOpaque.SetGlobalTexture(ShaderIDs.CameraDepthTex, ShaderIDs.CameraDepthTex);
afterOpaque.ReleaseTemporaryRT(ShaderIDs.CameraDepthTex);
afterOpaque.EndSample("Copy Depth");
}
//抓取颜色图
if (UseColorTexture)
{
afterOpaque.BeginSample("Copy Color");
afterOpaque.GetTemporaryRT(ShaderIDs.CameraColorTex, m_Width, m_Height, 0, FilterMode.Bilinear, RenderTextureFormat.ARGB32);
afterOpaque.CopyColorTexture(cameraColorTarget.colorBuffer, ShaderIDs.CameraColorTex, RuntimeUtilities.copyColorMat);
afterOpaque.SetGlobalTexture(ShaderIDs.CameraColorTex, ShaderIDs.CameraColorTex);
afterOpaque.ReleaseTemporaryRT(ShaderIDs.CameraColorTex);
afterOpaque.EndSample("Copy Color");
}
//后处理
beforImageEffect.Clear();
uberMat = materialFactory.Get(Resource.uber);
bloom.UpdateSettings(BloomIntensity, BloomThreshold, BloomDiffusion, BloomSoftKnee);
bloom.Render(materialFactory, Resource.bloom, UseBloom, beforImageEffect, cameraColorTarget, uberMat, m_Width, m_Height, hdrFormat);
colorGrading.Render(UseColorGrading, uberMat, LutTex2D);
screenDistort.Render(UseScreenDistort, uberMat, DistortIntensity, DistortSpeedX, DistortSpeedY, DistortDensity, Resource.distortTex);
//混合后处理结果
beforImageEffect.BeginSample("Uber");
if (UseToneMapping)
{
uberMat.EnableKeyword("ACES_TONEMAPPING");
}
else
{
uberMat.DisableKeyword("ACES_TONEMAPPING");
}
//抗锯齿
if (UseFXAA)
{
uberMat.SetFloat(ShaderIDs.UseFXAA, 1);
fxaaMat = materialFactory.Get(Resource.fxaa);
beforImageEffect.GetTemporaryRT(ShaderIDs.FXAASourceTex, m_Width, m_Height, 0, FilterMode.Bilinear, RenderTextureFormat.ARGB32);
beforImageEffect.BlitColorWithFullScreenTriangle(cameraColorTarget, ShaderIDs.FXAASourceTex, uberMat, 1);
beforImageEffect.EndSample("Uber");
beforImageEffect.BeginSample("FXAA");
beforImageEffect.BlitColorWithFullScreenTriangle(ShaderIDs.FXAASourceTex, BuiltinRenderTextureType.CameraTarget, fxaaMat, 0);
beforImageEffect.ReleaseTemporaryRT(ShaderIDs.FXAASourceTex);
beforImageEffect.EndSample("FXAA");
}
else
{
uberMat.SetFloat(ShaderIDs.UseFXAA, 0);
beforImageEffect.BlitColorWithFullScreenTriangle(cameraColorTarget, BuiltinRenderTextureType.CameraTarget, uberMat, 0);
beforImageEffect.EndSample("Uber");
}
}
public void Render(MaterialFactory materialFactory, Shader shader, bool bloom, CommandBuffer cmd,
RenderTargetIdentifier source, Material uberMat, int sourceWidth, int sourceHeight, RenderTextureFormat rtFormat)
{
if (intensity <= 0.01f || !bloom)
{
uberMat.DisableKeyword("BLOOM");
return;
}
bloomMat = materialFactory.Get(shader);
cmd.BeginSample("Bloom");
// 从半分辨率RT开始
int tw = sourceWidth >> 1;
int th = sourceHeight >> 1;
// 计算迭代次数
int s = Mathf.Max(tw, th);
float logs = Mathf.Log(s, 2f) + Mathf.Min(diffusion, 10f) - 10f;
int logs_i = Mathf.FloorToInt(logs);
int iterations = Mathf.Clamp(logs_i, 1, k_MaxPyramidSize);
float sampleScale = 0.5f + logs - logs_i;
bloomMat.SetFloat(ShaderIDs.SampleScale, sampleScale);
// 设置预过滤参数, 用于提取画面中高于阈值的亮度
float lthresh = Mathf.GammaToLinearSpace(threshold);
float knee = lthresh * softKnee + 1e-5f;
Vector4 thresholdV = new Vector4(lthresh, lthresh - knee, knee * 2f, 0.25f / knee);
bloomMat.SetVector(ShaderIDs.Threshold, thresholdV);
// 使用连续降采样+升采样的方式进行模糊
// 降采样, 第一次循环为预过滤pass
var lastDown = source;
for (int i = 0; i < iterations; i++)
{
int mipDown = m_Pyramid[i].down;
int mipUp = m_Pyramid[i].up;
int pass = (i == 0) ? 0 : 1;
cmd.GetTemporaryRT(mipDown, tw >> i, th >> i, 0, FilterMode.Bilinear, rtFormat);
cmd.GetTemporaryRT(mipUp, tw >> i, th >> i, 0, FilterMode.Bilinear, rtFormat);
cmd.BlitColorWithFullScreenTriangle(lastDown, mipDown, bloomMat, pass);
lastDown = mipDown;
}
// 升采样
int lastUp = m_Pyramid[iterations - 1].down;
for (int i = iterations - 2; i >= 0; i--)
{
int mipDown = m_Pyramid[i].down;
int mipUp = m_Pyramid[i].up;
cmd.SetGlobalTexture(ShaderIDs.BloomTex, mipDown);
cmd.BlitColorWithFullScreenTriangle(lastUp, mipUp, bloomMat, 2);
lastUp = mipUp;
}
// 给Uber传递bloom结果
uberMat.EnableKeyword("BLOOM");
intensity = RuntimeUtilities.Exp2(intensity / 10f) - 1f;
uberMat.SetFloat(ShaderIDs.BloomIntensity, intensity);
uberMat.SetFloat(ShaderIDs.SampleScale, sampleScale);
cmd.SetGlobalTexture(ShaderIDs.BloomTex, lastUp);
// 释放rt
for (int i = 0; i < iterations; i++)
{
if (m_Pyramid[i].down != lastUp)
{
cmd.ReleaseTemporaryRT(m_Pyramid[i].down);
}
if (m_Pyramid[i].up != lastUp)
{
cmd.ReleaseTemporaryRT(m_Pyramid[i].up);
}
}
cmd.EndSample("Bloom");
}