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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include <vector>
#include <array>
#include "../../../DiligentCore/Graphics/GraphicsEngine/interface/RenderDevice.h"
#include "../../../DiligentCore/Graphics/GraphicsEngine/interface/DeviceContext.h"
#include "../../../DiligentCore/Graphics/GraphicsEngine/interface/Texture.h"
#include "../../../DiligentCore/Graphics/GraphicsEngine/interface/TextureView.h"
#include "../../../DiligentCore/Common/interface/RefCntAutoPtr.hpp"
#include "../../../DiligentCore/Common/interface/BasicMath.hpp"
namespace Diligent
{
#include "Shaders/Common/public/BasicStructures.fxh"
class ShadowMapManager
{
public:
ShadowMapManager();
// clang-format off
/// Shadow map manager initialization info
struct InitInfo
{
/// Shadow map format. This parameter must not be TEX_FORMAT_UNKNOWN.
TEXTURE_FORMAT Format = TEX_FORMAT_UNKNOWN;
/// Shadow map resolution, must not be 0.
Uint32 Resolution = 0;
/// Number of shadow cascades, must not be 0.
Uint32 NumCascades = 0;
/// Shadow mode (see SHADOW_MODE_* defines in BasicStructures.fxh), must not be 0.
int ShadowMode = 0;
/// Whether to use 32-bit or 16-bit filterable textures
bool Is32BitFilterableFmt = false;
/// Optional comparison sampler to be set in the shadow map resource view
ISampler* pComparisonSampler = nullptr;
/// Optional sampler to be set in the filterable shadow map representation
ISampler* pFilterableShadowMapSampler = nullptr;
};
void Initialize(IRenderDevice* pDevice, const InitInfo& initInfo);
ITextureView* GetSRV() { return m_pShadowMapSRV; }
ITextureView* GetCascadeDSV(Uint32 Cascade){ return m_pShadowMapDSVs[Cascade]; }
ITextureView* GetFilterableSRV() { return m_pFilterableShadowMapSRV; }
struct DistributeCascadeInfo
{
/// Pointer to camera view matrix, must not be null.
const float4x4* pCameraView = nullptr;
/// Pointer to camera world matrix.
const float4x4* pCameraWorld = nullptr;
/// Pointer to camera projection matrix, must not be null.
const float4x4* pCameraProj = nullptr;
/// Pointer to light direction, must not be null.
const float3* pLightDir = nullptr;
/// Whether to snap cascades to texels in light view space
bool SnapCascades = true;
/// Whether to stabilize cascade extents in light view space
bool StabilizeExtents = true;
/// Whether to use same extents for X and Y axis. Enabled automatically if StabilizeExtents == true
bool EqualizeExtents = true;
/// Cascade partitioning factor that defines the ratio between fully linear (0.0) and
/// fully logarithmic (1.0) partitioning.
float fPartitioningFactor = 0.95f;
/// Whether to use right-handed or left-handed light view transform matrix
bool UseRightHandedLightViewTransform = true;
/// Callback that allows the application to adjust z range of every cascade.
/// The callback is also called with cascade value -1 to adjust that entire camera range.
std::function<void(int, float&, float&)> AdjustCascadeRange;
};
// clang-format on
struct CascadeTransforms
{
float4x4 Proj;
float4x4 WorldToLightProjSpace;
};
void DistributeCascades(const DistributeCascadeInfo& Info,
ShadowMapAttribs& shadowMapAttribs);
void ConvertToFilterable(IDeviceContext* pCtx, const ShadowMapAttribs& ShadowAttribs);
const CascadeTransforms& GetCascadeTranform(Uint32 Cascade) const { return m_CascadeTransforms[Cascade]; }
private:
void InitializeConversionTechniques(TEXTURE_FORMAT FilterableShadowMapFmt);
void InitializeResourceBindings();
int m_ShadowMode = 0;
RefCntAutoPtr<IRenderDevice> m_pDevice;
RefCntAutoPtr<ITextureView> m_pShadowMapSRV;
std::vector<RefCntAutoPtr<ITextureView>> m_pShadowMapDSVs;
RefCntAutoPtr<ITextureView> m_pFilterableShadowMapSRV;
std::vector<RefCntAutoPtr<ITextureView>> m_pFilterableShadowMapRTVs;
RefCntAutoPtr<ITextureView> m_pIntermediateSRV;
RefCntAutoPtr<ITextureView> m_pIntermediateRTV;
RefCntAutoPtr<IBuffer> m_pConversionAttribsBuffer;
std::vector<CascadeTransforms> m_CascadeTransforms;
struct ShadowConversionTechnique
{
RefCntAutoPtr<IPipelineState> PSO;
RefCntAutoPtr<IShaderResourceBinding> SRB;
};
std::array<ShadowConversionTechnique, SHADOW_MODE_EVSM4 + 1> m_ConversionTech;
ShadowConversionTechnique m_BlurVertTech;
};
} // namespace Diligent
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