volumetricfogcontext.h

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#pragma once
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#include "graphics/graphicscontext.h"
namespace Frame
{
class FrameScript;
};
 
namespace Fog
{
 
class VolumetricFogContext : public Graphics::GraphicsContext
{
    __DeclareContext()
public:

    VolumetricFogContext();
    virtual ~VolumetricFogContext();

    static void Create();
    static void Discard();

    static void SetupBoxVolume(
        const Graphics::GraphicsEntityId id,
        const Math::mat4& transform,
        const float density,
        const Math::vec3& absorption,
        const Graphics::StageMask stageMask = Graphics::PRIMARY_STAGE_MASK
    );
    static void SetBoxTransform(const Graphics::GraphicsEntityId id, const Math::mat4& transform);
 

    static void SetupSphereVolume(
        const Graphics::GraphicsEntityId id,
        const Math::vec3& position,
        float radius,
        const float density,
        const Math::vec3& absorption,
        const Graphics::StageMask stageMask = Graphics::PRIMARY_STAGE_MASK
    );
    static void SetSpherePosition(const Graphics::GraphicsEntityId id, const Math::vec3& position);
    static void SetSphereRadius(const Graphics::GraphicsEntityId id, const float radius);

    static void SetTurbidity(const Graphics::GraphicsEntityId id, const float turbidity);
    static void SetAbsorption(const Graphics::GraphicsEntityId id, const Math::vec3& absorption);

    static const Math::vec3& GetGlobalFogAbsorption();
    static void SetGlobalFogAbsorption(const Math::vec3& color);
    static float GetGlobalFogTurbidity();
    static void SetGlobalFogTurbidity(float turbidity);

    static void UpdateFogVolumes(const Graphics::FrameContext& ctx);
    static void RenderUI(const Graphics::FrameContext& ctx);

    void SetGlobalTurbidity(float f);
    void SetGlobalAbsorption(const Math::vec3& color);

    static Math::mat4 GetTransform(const Graphics::GraphicsEntityId id);
    static void SetTransform(const Graphics::GraphicsEntityId id, const Math::mat4& mat);
 
private:
 
    enum FogVolumeType
    {
        BoxVolume,
        SphereVolume
    };
    enum
    {
        FogVolume_Type,
        FogVolume_TypedId,
        FogVolume_Turbidity,
        FogVolume_Absorption,
        FogVolume_StageMask
    };
    typedef Ids::IdAllocator<
        FogVolumeType,
        Ids::Id32,
        float,
        Math::vec3,
        Graphics::StageMask
    > FogGenericVolumeAllocator;
    static FogGenericVolumeAllocator fogGenericVolumeAllocator;
 
    enum
    {
        FogBoxVolume_Transform,
    };
    typedef Ids::IdAllocator<
        Math::mat4
    > FogBoxVolumeAllocator;
    static FogBoxVolumeAllocator fogBoxVolumeAllocator;
 
    enum
    {
        FogSphereVolume_Position,
        FogSphereVolume_Radius,
    };
    typedef Ids::IdAllocator<
        Math::vec3,
        float
    > FogSphereVolumeAllocator;
    static FogSphereVolumeAllocator fogSphereVolumeAllocator;

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