ddgicontext.h

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#pragma once
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#include "gpulang/render/gi/shaders/probe_finalize.h"
#include "gpulang/render/gi/shaders/probe_update.h"
 
#include "graphics/graphicscontext.h"
namespace GI
{
 
union DDGIOptions
{
    struct
    {
        uint scrolling : 1;             // Infinitely scrolls based on camera position
        uint classify : 1;              // Enables/disables probes based on hits
        uint relocate : 1;              // Relocate probes to avoid them being stuck inside geometry
        uint lowPrecisionTextures : 1;  // Use more compact texture formats at the expense of quality
    } flags;
    uint32_t bits = 0x0;
};
 
class DDGIContext : public Graphics::GraphicsContext
{
    __DeclareContext()
public:
    DDGIContext();
    ~DDGIContext();

    static void Create();
    static void Discard();
 
    struct VolumeSetup
    {
        uint numProbesX, numProbesY, numProbesZ;
        uint numRaysPerProbe;
        Math::vec3 size;
        Math::vec3 position;
 
        float normalBias = 0.1f;
        float viewBias = 0.4f;
        float irradianceScale = 1.0f;
        float distanceExponent = 0.5f;
        float encodingGamma = 5.0f;
        float changeThreshold = 0.2f;
        float brightnessThreshold = 2.0f;
        float hysteresis = 0.97f;
        float blendCutoff = 0.0f;
        float blend = 0.0f;
        float updateBudget = 1.0f;
 
        Graphics::StageMask stageMask;
        DDGIOptions options;
    };

    static void SetupVolume(const Graphics::GraphicsEntityId id, const VolumeSetup& setup);
    static void SetPosition(const Graphics::GraphicsEntityId id, const Math::vec3& position);
    static void SetSize(const Graphics::GraphicsEntityId id, const Math::vec3& size);

    static void UpdateActiveVolumes(const Graphics::ViewId view, const Graphics::FrameContext& ctx);
 
#ifndef PUBLIC_BUILD
    static void OnRenderDebug(uint32_t flags);
#endif
 
private:
 
    struct Volume
    {
        uint numProbesX, numProbesY, numProbesZ;
        uint numRaysPerProbe;
        Math::vec3 size;
        Math::vec3 position;
        Math::bbox boundingBox;
        CoreGraphics::TextureId radiance; // Ray tracing output
        CoreGraphics::TextureId irradiance, distance, offsets, states, scrollSpace;
        CoreGraphics::BufferId volumeConstantBuffer;
        CoreGraphics::ResourceTableId updateProbesTable, blendProbesTable, relocateProbesTable;
 
        float normalBias = 0.1f;
        float viewBias = 0.4f;
        float irradianceScale = 1.0f;
        float distanceExponent = 50.0f;
        float encodingGamma = 5.0f;
        float changeThreshold = 0.2f;
        float brightnessThreshold = 2.0f;
        float backfaceThreshold = 0.25f;
        float minFrontfaceDistance = 0.1f;
        float hysteresis = 0.97f;
        float blendCutoff = 0.0f;
        float blend = 0.0f;
        
        ProbeUpdate::VolumeConstants::STRUCT volumeConstants;
        DDGIOptions options;
 
        Graphics::StageMask stageMask;
 
#ifndef PUBLIC_BUILD
        CoreGraphics::ResourceTableId debugResourceTable;
#endif
 
    };
    
    typedef Ids::IdAllocator<
        Volume
    > DDGIVolumeAllocator;
    static DDGIVolumeAllocator ddgiVolumeAllocator;
    

    static Graphics::ContextEntityId Alloc();
    static void Dealloc(Graphics::ContextEntityId id);
};
 
} // namespace GI