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Add mesh shader support to rendering context and fix some bugs.

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Misaki
2025-11-05 09:37:54 +00:00
parent 3bcf0ad539
commit b3eeb8d366
8 changed files with 65 additions and 28 deletions
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53
Ghost.Graphics/Core/RenderingContext.cs
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@@ -134,15 +134,17 @@ public unsafe readonly ref struct RenderingContext
_resourceDatabase.SetResourceState(texture.AsResource(), sateBefore);
}
}
#if false
// TODO: Ideally we should queue the draw call to our rendering system, and render it in the full rendering pipeline.
// This is just a place holder for now for testing purpose.
// TODO: Since we are using mesh shader, we should use dispatch mesh instead of draw calls.
public void RenderMesh(Handle<Mesh> mesh, Handle<Material> material, string passName)
{
//_cmd.DrawMesh(mesh, material);
ref var meshRef = ref _resourceDatabase.GetMeshReference(mesh);
ref var materialRef = ref _resourceDatabase.GetMaterialReference(material);
var shader = _resourceDatabase.GetShaderReference(materialRef.Shader);
shader.TryGetPassKey(passName, out var passKey);
shader.TryGetPassKey(passName, out var passIndex, out var passKey);
var hash = new GraphicsPipelineHash
{
id = passKey,
@@ -160,7 +162,7 @@ public unsafe readonly ref struct RenderingContext
// for (int i = 0; i < 4; i++)
{
ref var cache = ref materialRef.GetPassCache((int)passKey.value);
ref var cache = ref materialRef.GetPassCache(passIndex);
_directCmb.SetConstantBufferView(RootSignatureLayout.PER_MATERIAL_BUFFER_SLOT, cache.GpuResource);
}
@@ -177,6 +179,49 @@ public unsafe readonly ref struct RenderingContext
var triangleCount = (uint)meshRef.indices.Count / 3;
_directCmb.Draw(3, triangleCount, 0, 0);
}
#endif
// TODO: Ideally we should queue the draw call to our rendering system, and render it in the full rendering pipeline.
// This is just a place holder for now for testing purpose.
// TODO: Since we are using mesh shader, we should use dispatch mesh instead of draw calls.
public void DispatchMesh(Handle<Mesh> mesh, Handle<Material> material, string passName, uint numThreadsX)
{
ref var meshRef = ref _resourceDatabase.GetMeshReference(mesh);
ref var materialRef = ref _resourceDatabase.GetMaterialReference(material);
var shader = _resourceDatabase.GetShaderReference(materialRef.Shader);
shader.TryGetPassKey(passName, out var passIndex, out var passKey);
var hash = new GraphicsPipelineHash
{
id = passKey,
rtvCount = 1,
dsvFormat = TextureFormat.Unknown,
};
hash.rtvFormats[0] = TextureFormat.B8G8R8A8_UNorm;
var pipelineKey = hash.GetKey();
_directCmb.SetPipelineState(pipelineKey);
// FIX: Get valid root signature. In D3D12, we use fixed root signature layout for bindless rendering.
// However, our code should not assume that blindly. Each pipeline should have contained root signature info even if there are fixed.
// This ensures that future changes to root signature layout can be accommodated.
// for (int i = 0; i < 4; i++)
{
ref var cache = ref materialRef.GetPassCache(passIndex);
_directCmb.SetConstantBufferView(RootSignatureLayout.PER_MATERIAL_BUFFER_SLOT, cache.GpuResource);
}
// NOTE: Since we are using true bindless resources, we only need to set the descriptor heaps, not individual tables.
// TODO: Matbe handle the transitional bindless model?
#if false
var samplerGpuHandle = _descriptorAllocator.GetSamplerHeap()->GetGPUDescriptorHandleForHeapStart();
_commandList.Get()->SetGraphicsRootDescriptorTable(rootParamIndex, samplerGpuHandle);
#endif
var threadGroupCountX = ((uint)meshRef.indices.Count + numThreadsX - 1) / numThreadsX;
_directCmb.DispatchMesh(threadGroupCountX, 1, 1);
}
public void ExecuteCopyCommands()
{