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// Copyright 2015 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "VideoBackends/D3D12/D3DBase.h"
#include "VideoBackends/D3D12/D3DDescriptorHeapManager.h"
#include "VideoBackends/D3D12/D3DState.h"
namespace DX12
{
bool operator==(const D3DDescriptorHeapManager::SamplerStateSet& lhs, const D3DDescriptorHeapManager::SamplerStateSet& rhs)
{
// D3D12TODO: Do something more efficient than this.
return (!memcmp(&lhs, &rhs, sizeof(D3DDescriptorHeapManager::SamplerStateSet)));
}
D3DDescriptorHeapManager::D3DDescriptorHeapManager(D3D12_DESCRIPTOR_HEAP_DESC* desc, ID3D12Device* device, unsigned int temporarySlots) :
m_device(device)
{
CheckHR(device->CreateDescriptorHeap(desc, IID_PPV_ARGS(&m_descriptor_heap)));
m_descriptor_heap_size = desc->NumDescriptors;
m_descriptor_increment_size = device->GetDescriptorHandleIncrementSize(desc->Type);
m_gpu_visible = (desc->Flags == D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE);
if (m_gpu_visible)
{
D3D12_DESCRIPTOR_HEAP_DESC cpu_shadow_heap_desc = *desc;
cpu_shadow_heap_desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
CheckHR(device->CreateDescriptorHeap(&cpu_shadow_heap_desc, IID_PPV_ARGS(&m_descriptor_heap_cpu_shadow)));
m_heap_base_gpu = m_descriptor_heap->GetGPUDescriptorHandleForHeapStart();
m_heap_base_gpu_cpu_shadow = m_descriptor_heap_cpu_shadow->GetCPUDescriptorHandleForHeapStart();
}
m_heap_base_cpu = m_descriptor_heap->GetCPUDescriptorHandleForHeapStart();
m_first_temporary_slot_in_heap = m_descriptor_heap_size - temporarySlots;
m_current_temporary_offset_in_heap = m_first_temporary_slot_in_heap;
}
bool D3DDescriptorHeapManager::Allocate(D3D12_CPU_DESCRIPTOR_HANDLE* cpu_handle, D3D12_GPU_DESCRIPTOR_HANDLE* gpu_handle, D3D12_CPU_DESCRIPTOR_HANDLE* gpu_handle_cpu_shadow, bool temporary)
{
bool allocated_from_current_heap = true;
if (m_current_permanent_offset_in_heap + 1 >= m_first_temporary_slot_in_heap)
{
// If out of room in the heap, start back at beginning.
allocated_from_current_heap = false;
m_current_permanent_offset_in_heap = 0;
}
CHECK(!gpu_handle || (gpu_handle && m_gpu_visible), "D3D12_GPU_DESCRIPTOR_HANDLE used on non-GPU-visible heap.");
if (temporary && m_current_temporary_offset_in_heap + 1 >= m_descriptor_heap_size)
{
m_current_temporary_offset_in_heap = m_first_temporary_slot_in_heap;
}
unsigned int heapOffsetToUse = temporary ? m_current_temporary_offset_in_heap : m_current_permanent_offset_in_heap;
if (m_gpu_visible)
{
gpu_handle->ptr = m_heap_base_gpu.ptr + heapOffsetToUse * m_descriptor_increment_size;
if (gpu_handle_cpu_shadow)
gpu_handle_cpu_shadow->ptr = m_heap_base_gpu_cpu_shadow.ptr + heapOffsetToUse * m_descriptor_increment_size;
}
cpu_handle->ptr = m_heap_base_cpu.ptr + heapOffsetToUse * m_descriptor_increment_size;
if (!temporary)
{
m_current_permanent_offset_in_heap++;
}
return allocated_from_current_heap;
}
bool D3DDescriptorHeapManager::AllocateGroup(D3D12_CPU_DESCRIPTOR_HANDLE* base_cpu_handle, unsigned int num_handles, D3D12_GPU_DESCRIPTOR_HANDLE* base_gpu_handle, D3D12_CPU_DESCRIPTOR_HANDLE* base_gpu_handle_cpu_shadow, bool temporary)
{
bool allocated_from_current_heap = true;
if (m_current_permanent_offset_in_heap + num_handles >= m_first_temporary_slot_in_heap)
{
// If out of room in the heap, start back at beginning.
allocated_from_current_heap = false;
m_current_permanent_offset_in_heap = 0;
}
CHECK(!base_gpu_handle || (base_gpu_handle && m_gpu_visible), "D3D12_GPU_DESCRIPTOR_HANDLE used on non-GPU-visible heap.");
if (temporary && m_current_temporary_offset_in_heap + num_handles >= m_descriptor_heap_size)
{
m_current_temporary_offset_in_heap = m_first_temporary_slot_in_heap;
}
unsigned int heapOffsetToUse = temporary ? m_current_temporary_offset_in_heap : m_current_permanent_offset_in_heap;
if (m_gpu_visible)
{
base_gpu_handle->ptr = m_heap_base_gpu.ptr + heapOffsetToUse * m_descriptor_increment_size;
if (base_gpu_handle_cpu_shadow)
base_gpu_handle_cpu_shadow->ptr = m_heap_base_gpu_cpu_shadow.ptr + heapOffsetToUse * m_descriptor_increment_size;
}
base_cpu_handle->ptr = m_heap_base_cpu.ptr + heapOffsetToUse * m_descriptor_increment_size;
if (temporary)
{
m_current_temporary_offset_in_heap += num_handles;
}
else
{
m_current_permanent_offset_in_heap += num_handles;
}
return allocated_from_current_heap;
}
D3D12_GPU_DESCRIPTOR_HANDLE D3DDescriptorHeapManager::GetHandleForSamplerGroup(SamplerState* sampler_state, unsigned int num_sampler_samples)
{
auto it = m_sampler_map.find(*reinterpret_cast<SamplerStateSet*>(sampler_state));
if (it == m_sampler_map.end())
{
D3D12_CPU_DESCRIPTOR_HANDLE base_sampler_cpu_handle;
D3D12_GPU_DESCRIPTOR_HANDLE base_sampler_gpu_handle;
bool allocatedFromExistingHeap = AllocateGroup(&base_sampler_cpu_handle, num_sampler_samples, &base_sampler_gpu_handle);
if (!allocatedFromExistingHeap)
{
m_sampler_map.clear();
}
for (unsigned int i = 0; i < num_sampler_samples; i++)
{
D3D12_CPU_DESCRIPTOR_HANDLE destinationDescriptor;
destinationDescriptor.ptr = base_sampler_cpu_handle.ptr + i * D3D::sampler_descriptor_size;
D3D::device12->CreateSampler(&StateCache::GetDesc12(sampler_state[i]), destinationDescriptor);
}
m_sampler_map[*reinterpret_cast<SamplerStateSet*>(sampler_state)] = base_sampler_gpu_handle;
return base_sampler_gpu_handle;
}
else
{
return it->second;
}
}
ID3D12DescriptorHeap* D3DDescriptorHeapManager::GetDescriptorHeap() const
{
return m_descriptor_heap;
}
D3DDescriptorHeapManager::~D3DDescriptorHeapManager()
{
SAFE_RELEASE(m_descriptor_heap);
SAFE_RELEASE(m_descriptor_heap_cpu_shadow);
}
} // namespace DX12
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