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Add support for cascades to DDGI

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This commit is contained in:
Wojciech Figat
2022-06-09 08:55:45 +02:00
parent 73d762cf0c
commit 6a74ebd62e
14 changed files with 395 additions and 234 deletions
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43
Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp
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@@ -383,8 +383,10 @@ bool GlobalSignDistanceFieldPass::Render(RenderContext& renderContext, GPUContex
const int32 resolution = 256;
const int32 resolutionMip = Math::DivideAndRoundUp(resolution, GLOBAL_SDF_RASTERIZE_MIP_FACTOR);
// TODO: configurable via postFx settings
const float distanceExtent = 2000.0f;
const float cascadesDistances[] = { distanceExtent, distanceExtent * 2.0f, distanceExtent * 4.0f, distanceExtent * 8.0f };
const int32 cascadesCount = 4; // in range 1-4
const float distance = true ? 20000.0f : 16000.0f; // TODO: switch based if using GI, then use GI range
const float cascadesDistanceScales[] = { 1.0f, 2.0f, 4.0f, 8.0f };
const float distanceExtent = distance / cascadesDistanceScales[cascadesCount - 1];
// Initialize buffers
auto desc = GPUTextureDescription::New3D(resolution, resolution, resolution, GLOBAL_SDF_FORMAT, GPUTextureFlags::ShaderResource | GPUTextureFlags::UnorderedAccess, 1);
@@ -449,23 +451,22 @@ bool GlobalSignDistanceFieldPass::Render(RenderContext& renderContext, GPUContex
bool anyDraw = false;
const uint64 cascadeFrequencies[] = { 2, 3, 5, 11 };
//const uint64 cascadeFrequencies[] = { 1, 1, 1, 1 };
for (int32 cascade = 0; cascade < 4; cascade++)
for (int32 cascadeIndex = 0; cascadeIndex < 4; cascadeIndex++)
{
// Reduce frequency of the updates
if (useCache && (Engine::FrameCount % cascadeFrequencies[cascadeIndex]) != 0)
continue;
auto& cascade = sdfData.Cascades[cascadeIndex];
const float distance = cascadesDistances[cascadeIndex];
const float maxDistance = distance * 2;
const float voxelSize = maxDistance / resolution;
const float chunkSize = voxelSize * GLOBAL_SDF_RASTERIZE_CHUNK_SIZE;
const float cascadeDistance = distanceExtent * cascadesDistanceScales[cascadeIndex];
const float cascadeMaxDistance = cascadeDistance * 2;
const float cascadeVoxelSize = cascadeMaxDistance / resolution;
const float cascadeChunkSize = cascadeVoxelSize * GLOBAL_SDF_RASTERIZE_CHUNK_SIZE;
static_assert(GLOBAL_SDF_RASTERIZE_CHUNK_SIZE % GLOBAL_SDF_RASTERIZE_MIP_FACTOR == 0, "Adjust chunk size to match the mip factor scale.");
const Vector3 center = Vector3::Floor(renderContext.View.Position / chunkSize) * chunkSize;
const Vector3 center = Vector3::Floor(renderContext.View.Position / cascadeChunkSize) * cascadeChunkSize;
//const Vector3 center = Vector3::Zero;
BoundingBox cascadeBounds(center - distance, center + distance);
BoundingBox cascadeBounds(center - cascadeDistance, center + cascadeDistance);
// TODO: add scene detail scale factor to PostFx settings (eg. to increase or decrease scene details and quality)
const float minObjectRadius = Math::Max(20.0f, voxelSize * 0.5f); // Skip too small objects for this cascade
const float minObjectRadius = Math::Max(20.0f, cascadeVoxelSize * 0.5f); // Skip too small objects for this cascade
GPUTextureView* cascadeView = cascade.Texture->ViewVolume();
GPUTextureView* cascadeMipView = cascade.Mip->ViewVolume();
@@ -478,18 +479,18 @@ bool GlobalSignDistanceFieldPass::Render(RenderContext& renderContext, GPUContex
}
// Check if cascade center has been moved
if (!(useCache && Vector3::NearEqual(cascade.Position, center, voxelSize)))
if (!(useCache && Vector3::NearEqual(cascade.Position, center, cascadeVoxelSize)))
{
// TODO: optimize for moving camera (copy sdf for cached chunks)
cascade.StaticChunks.Clear();
}
cascade.Position = center;
cascade.VoxelSize = voxelSize;
cascade.VoxelSize = cascadeVoxelSize;
cascade.Bounds = cascadeBounds;
// Draw all objects from all scenes into the cascade
_objectsBufferCount = 0;
_voxelSize = voxelSize;
_voxelSize = cascadeVoxelSize;
_cascadeBounds = cascadeBounds;
_cascadeIndex = cascadeIndex;
_sdfData = &sdfData;
@@ -518,12 +519,12 @@ bool GlobalSignDistanceFieldPass::Render(RenderContext& renderContext, GPUContex
}
ModelsRasterizeData data;
data.CascadeCoordToPosMul = cascadeBounds.GetSize() / resolution;
data.CascadeCoordToPosAdd = cascadeBounds.Minimum + voxelSize * 0.5f;
data.MaxDistance = maxDistance;
data.CascadeCoordToPosAdd = cascadeBounds.Minimum + cascadeVoxelSize * 0.5f;
data.MaxDistance = cascadeMaxDistance;
data.CascadeResolution = resolution;
data.CascadeMipResolution = resolutionMip;
data.CascadeMipFactor = GLOBAL_SDF_RASTERIZE_MIP_FACTOR;
data.CascadeVoxelSize = voxelSize;
data.CascadeVoxelSize = cascadeVoxelSize;
context->BindUA(0, cascadeView);
context->BindCB(1, _cb1);
const int32 chunkDispatchGroups = GLOBAL_SDF_RASTERIZE_CHUNK_SIZE / GLOBAL_SDF_RASTERIZE_GROUP_SIZE;
@@ -728,12 +729,12 @@ bool GlobalSignDistanceFieldPass::Render(RenderContext& renderContext, GPUContex
for (int32 cascadeIndex = 0; cascadeIndex < 4; cascadeIndex++)
{
auto& cascade = sdfData.Cascades[cascadeIndex];
const float distance = cascadesDistances[cascadeIndex];
const float maxDistance = distance * 2;
const float voxelSize = maxDistance / resolution;
const float cascadeDistance = distanceExtent * cascadesDistanceScales[cascadeIndex];
const float cascadeMaxDistance = cascadeDistance * 2;
const float cascadeVoxelSize = cascadeMaxDistance / resolution;
const Vector3 center = cascade.Position;
result.Constants.CascadePosDistance[cascadeIndex] = Vector4(center, distance);
result.Constants.CascadeVoxelSize.Raw[cascadeIndex] = voxelSize;
result.Constants.CascadePosDistance[cascadeIndex] = Vector4(center, cascadeDistance);
result.Constants.CascadeVoxelSize.Raw[cascadeIndex] = cascadeVoxelSize;
result.Cascades[cascadeIndex] = cascade.Texture;
result.CascadeMips[cascadeIndex] = cascade.Mip;
}