bool DoBloom(int sourceId)
{
//buffer.BeginSample("Bloom");
PostFXSettings.BloomSettings bloom = settings.Bloom;
int width = camera.pixelWidth / 2, height = camera.pixelHeight / 2;
if (bloom.maxIterations == 0 || bloom.intensity <= 0f || height < bloom.downscaleLimit || width < bloom.downscaleLimit)
{
//Draw(sourceId,BuiltinRenderTextureType.CameraTarget,Pass.Copy);
//buffer.EndSample("Bloom");
return(false);
}
buffer.BeginSample("Bloom");
//阀值超过阀值的像素部分才会Bloom
Vector4 threshold;
threshold.x = Mathf.GammaToLinearSpace(bloom.threshold);
threshold.y = threshold.x * bloom.thresholdKnee;
threshold.z = 2f * threshold.y;
threshold.w = 0.25f / (threshold.y + 0.00001f);
threshold.y -= threshold.x;
buffer.SetGlobalVector(bloomThresholdId, threshold);
//看是否支持HDR格式纹理
RenderTextureFormat format = useHDR?RenderTextureFormat.DefaultHDR:RenderTextureFormat.Default;
//降采样
buffer.GetTemporaryRT(bloomPrefilterId, width, height, 0, FilterMode.Bilinear, format);
Draw(sourceId, bloomPrefilterId, bloom.fadeFireflies ? Pass.BloomPrefilterFireflies: Pass.BloomPrefilter);
width /= 2;
height /= 2;
int fromId = bloomPrefilterId, toId = bloomPyramidId + 1;
int i;
for (i = 0; i < bloom.maxIterations; i++)
{
if (height < bloom.downscaleLimit * 2 || width < bloom.downscaleLimit * 2) //划分到最小像素 降分辨率
{
break;
}
int midId = toId - 1;
buffer.GetTemporaryRT(midId, width, height, 0, FilterMode.Bilinear, format);
buffer.GetTemporaryRT(toId, width, height, 0, FilterMode.Bilinear, format);
Draw(fromId, midId, Pass.BloomHorizontal);
Draw(midId, toId, Pass.BloomVertical);
fromId = toId;
toId += 2;
width /= 2;
height /= 2;
}
buffer.ReleaseTemporaryRT(bloomPrefilterId);
buffer.SetGlobalFloat(bloomBucibicUpsamplingId, bloom.bicubicUpsampling?1f:0f);
//Draw(fromId,BuiltinRenderTextureType.CameraTarget,Pass.Copy);
Pass combinePass, finalPass;
float finalIntensity;
if (bloom.mode == PostFXSettings.BloomSettings.Mode.Additive)
{
combinePass = finalPass = Pass.BloomAdd;
buffer.SetGlobalFloat(bloomIntensityId, 1f);
finalIntensity = bloom.intensity;
}
else
{
combinePass = Pass.BloomScatter;
finalPass = Pass.BloomScatterFinal;
buffer.SetGlobalFloat(bloomIntensityId, bloom.scatter);
finalIntensity = Mathf.Min(bloom.intensity, 0.95f);
}
//升采样
if (i > 1) //迭代次数大于1次
{
buffer.ReleaseTemporaryRT(fromId - 1);
toId -= 5;
for (i -= 1; i > 0; i--)
{
buffer.SetGlobalTexture(fxSource2Id, toId + 1); //上去5次？
Draw(fromId, toId, combinePass);
buffer.ReleaseTemporaryRT(fromId);
buffer.ReleaseTemporaryRT(toId + 1);
fromId = toId;
toId -= 2;
}
}
else
{
buffer.ReleaseTemporaryRT(bloomPyramidId);
}
buffer.SetGlobalFloat(bloomIntensityId, finalIntensity);
buffer.SetGlobalTexture(fxSource2Id, sourceId);
//如果有Bloom 渲染到Result RT 上面
buffer.GetTemporaryRT(bloomResultId, camera.pixelWidth, camera.pixelHeight, 0, FilterMode.Bilinear, format);
Draw(fromId, bloomResultId, finalPass);
buffer.ReleaseTemporaryRT(fromId);
buffer.EndSample("Bloom");
return(true);
}
bool DoBloom(int SourceId)
{
PostFXSettings.BloomSettings bloomSettings = settings.Bloom;
//if the blomm should based on scaled render buffer size
int width, height;
if (bloomSettings.ignoreRenderScale)
{
width = camera.pixelWidth / 2;
height = camera.pixelHeight / 2;
}
else
{
width = bufferSize.x / 2;
height = bufferSize.y / 2;
}
if (bloomSettings.maxIterations == 0 || bloomSettings.intensity <= 0f ||
height < bloomSettings.downscaleLimit || width < bloomSettings.downscaleLimit)
{
//Draw(SourceId, BuiltinRenderTextureType.CameraTarget, Pass.Copy);
//buffer.EndSample("Bloom");
return(false);
}
buffer.BeginSample("Bloom");
//compute the constant part of bloom threshold knee
Vector4 threshold;
threshold.x = Mathf.GammaToLinearSpace(bloomSettings.threshold);
threshold.y = threshold.x * bloomSettings.thresholdKnee;
threshold.z = 2f * threshold.y;
threshold.w = 0.25f / (threshold.y + 0.00001f);
threshold.y -= threshold.x;
buffer.SetGlobalVector(bloomThreshold, threshold);
//unform format for easier switch HDR
RenderTextureFormat format = useHDR ? RenderTextureFormat.DefaultHDR : RenderTextureFormat.Default;
//We start bloom at half resolution
buffer.GetTemporaryRT(bloomPrefilterId, width, height, 0, FilterMode.Bilinear, format);
Draw(SourceId, bloomPrefilterId,
settings.Bloom.Fade_FireFlies? Pass.BloomPrefilterFireFlies : Pass.BloomPrefilter);
width /= 2;
height /= 2;
//We are using 2 pass per bloom level
int fromId = bloomPrefilterId, toId = bloomPyramidId + 1;
int i;
for (i = 0; i < bloomSettings.maxIterations; i++)
{
if (width < bloomSettings.downscaleLimit * 2 || height < bloomSettings.downscaleLimit * 2)
{
break;
}
int midId = toId - 1;
buffer.GetTemporaryRT(midId, width, height, 0, FilterMode.Bilinear, format);
buffer.GetTemporaryRT(toId, width, height, 0, FilterMode.Bilinear, format);
Draw(fromId, midId, Pass.BloomHorizontal);
Draw(midId, toId, Pass.BloomVertical);
fromId = toId;
toId += 2;
width /= 2;
height /= 2;
}
buffer.ReleaseTemporaryRT(bloomPrefilterId);
//Draw(fromId, BuiltinRenderTextureType.CameraTarget, Pass.Copy);
//release the mid for last level
buffer.ReleaseTemporaryRT(fromId - 1);
//set toId to the mid of one level higher
toId -= 5;
// combine bloom
Pass combinePass, finalPass;
float finalIntensity;
if (bloomSettings.mode == PostFXSettings.BloomSettings.Mode.Additive)
{
combinePass = finalPass = Pass.BloomAdd;
buffer.SetGlobalFloat(bloomIntensityId, 1f);
finalIntensity = bloomSettings.intensity;
}
else
{
combinePass = Pass.BloomScatter;
finalPass = Pass.BloomScatterFinal;
buffer.SetGlobalFloat(bloomIntensityId, bloomSettings.intensity);
finalIntensity = Mathf.Min(bloomSettings.intensity, 0.95f);
}
buffer.SetGlobalFloat(bloomBicubicUpsamplingId, bloomSettings.bicubicUpsampling ? 1f : 0f);
if (i > 1)
{
//stop at the 1st level, special case for level before last level
//just in-order to reuse RTs
for (i -= 1; i > 0; i--)
{
buffer.SetGlobalTexture(fxSource2Id, toId + 1);
Draw(fromId, toId, combinePass);
buffer.ReleaseTemporaryRT(fromId);
buffer.ReleaseTemporaryRT(toId + 1);
fromId = toId;
toId -= 2;
}
}
else
{
buffer.ReleaseTemporaryRT(bloomPyramidId);
}
buffer.SetGlobalFloat(bloomIntensityId, finalIntensity);
buffer.SetGlobalTexture(fxSource2Id, SourceId);
buffer.GetTemporaryRT(bloomResultId, bufferSize.x, bufferSize.y, 0,
FilterMode.Bilinear, format);
//Draw the bloom result on a RT for tone mapping
Draw(fromId, bloomResultId, finalPass);
buffer.ReleaseTemporaryRT(fromId);
buffer.EndSample("Bloom");
return(true);
}