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135 lines
4.2 KiB
135 lines
4.2 KiB
//============ Copyright (c) Valve Corporation, All rights reserved. ============
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#ifndef CSM_PARALLEL_SPLIT_H
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#define CSM_PARALLEL_SPLIT_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "mathlib/volumeculler.h"
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#include "mathlib/camera.h"
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namespace CCSMFrustumDefinition
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{
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enum { NUM_FRUSTUM_VERTS = 8 };
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enum { NUM_FRUSTUM_QUADS = 6 };
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enum { NUM_FRUSTUM_PLANES = NUM_FRUSTUM_QUADS };
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enum { NUM_FRUSTUM_EDGES = 12 };
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enum { NUM_FRUSTUM_LINES = 12 };
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extern Vector4D g_vProjFrustumVerts[NUM_FRUSTUM_VERTS];
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extern const uint8 g_nFrustumLineVertIndices[24];
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// The vertices of each frustum quad
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extern const uint8 g_nQuadVertIndices[NUM_FRUSTUM_QUADS][4];
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// The vertices of each frustum edge
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extern const uint8 g_nEdgeVertIndices[NUM_FRUSTUM_EDGES][2];
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// The quads sharing each frustum edge
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extern const uint8 g_nEdgeQuadIndices[NUM_FRUSTUM_EDGES][2];
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} // namespace CCSMFrustumDefinition
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enum
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{
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// Use caution changing this constant. There are a number of assumptions made about the max # of cascades being 4 (such as the manually laid out shader constants).
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MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE = 4
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};
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struct ShadowFrustaDebugInfo_t
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{
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uint m_nNumWorldFocusVerts;
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enum { MAX_WORLD_FOCUS_POINTS = 9 };
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Vector m_WorldFocusVerts[MAX_WORLD_FOCUS_POINTS];
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float m_flSplitPlaneDistance;
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float m_flLeft, m_flRight;
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float m_flTop, m_flBottom;
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float m_flZNear, m_flZFar;
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};
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struct SunLightState_t
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{
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uint m_nShadowCascadeSize;
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CFrustum m_CascadeFrustums[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ];
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CVolumeCuller m_CascadeVolumeCullers[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ];
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VMatrix m_CascadeProjToTexMatrices[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ];
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Rect_t m_CascadeViewports[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ];
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VPlane m_CascadeFrustumPlanes[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ][6];
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CascadedShadowMappingState_t m_SunLightShaderParams;
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ShadowFrustaDebugInfo_t m_DebugInfo[ MAX_SUN_LIGHT_SHADOW_CASCADE_SIZE ];
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float m_flActualMaxShadowDist;
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float m_flZLerpStartDist;
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float m_flZLerpEndDist;
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};
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struct SunLightViewState_t
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{
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Vector m_Direction;
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color32 m_LightColor;
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int m_LightColorScale;
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CFrustum m_frustum;
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int m_nMaxCascadeSize;
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int m_nAtlasFirstCascadeIndex;
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bool m_bSetAllCascadesToFirst;
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float m_flMaxVisibleDist;
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float m_flMaxShadowDist;
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int m_nCSMQualityLevel;
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};
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class CCSMParallelSplit : public CAlignedNewDelete<>
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{
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public:
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CCSMParallelSplit();
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~CCSMParallelSplit();
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CCSMParallelSplit( const CCSMParallelSplit &other );
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const CCSMParallelSplit &operator==( const CCSMParallelSplit &rhs );
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void Init( uint nMaxShadowBufferSize, uint nMaxCascadeSize );
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void Clear();
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bool Update( const SunLightViewState_t &viewState );
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bool IsValid() const { return m_bValid; }
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inline void Reset() { m_bValid = false; }
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const SunLightViewState_t& GetViewState() const { return m_viewState; }
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SunLightViewState_t& GetViewState() { return m_viewState; }
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const SunLightState_t &GetLightState() const { return m_lightState; }
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SunLightState_t &GetLightState() { return m_lightState; }
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private:
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void CalculateShadowFrustaParallelSplits( const CFrustum &sceneFrustum, uint &nOutCascadeSize, CFrustum *pOutFrustums, CVolumeCuller *pOutVolumeCullers, float &flOutActualMaxShadowDist, int nMaxCascadeSize, Vector vLightDir, float flMaxShadowDistance, float flMaxVisibleDistance, int nCSMQualityLevel, ShadowFrustaDebugInfo_t* pDebugInfo );
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uint ComputeCullingVolumePlanes( VPlane *pOutPlanes, Vector vDirToLight, const CFrustum &sceneFrustum, float flMaxDistBetweenAnyCasterAndReceiver );
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void ComputeCascadeProjToTexMatrices( SunLightState_t &lightState );
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static float CalculateSplitPlaneDistance( int nSplit, int nShadowSplits, float flMaxShadowDistance, float flZNear, float flZFar );
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float ComputeFarPlaneCameraRelativePoints( Vector *pPoints, float flZNear, float flZFar, const CFrustum &frustum );
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bool m_bValid;
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uint m_nShadowBufferSize; // resolution of a single shadow map
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uint m_nShadowCascadeMaxSize; // cascade size (number of shadow maps)
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uint m_nShadowAtlasWidth; // actual shadow texture resolution
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uint m_nShadowAtlasHeight;
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SunLightViewState_t m_viewState;
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SunLightState_t m_lightState;
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};
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#endif //CSM_PARALLEL_SPLIT_H
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