vegetationcontext.h

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#pragma once
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#include "graphics/graphicscontext.h"
#include "resources/resource.h"
#include "ids/idallocator.h"
 
namespace Vegetation
{
 
ID_32_TYPE(VegetationBiomeId);
struct VegetationSetupSettings
{
    float minHeight, maxHeight;
 
    Math::vec2 worldSize;
};
 
struct VegetationGrassSetup
{
    Resources::ResourceName mask;           // expects a 1 channel texture
    Resources::ResourceName albedo;
    Resources::ResourceName normals;
    Resources::ResourceName material;
    float slopeThreshold;                   // slope threshold in percentage
    float heightThreshold;                  // height threshold in percentage
};
 
struct VegetationMeshSetup
{
    Resources::ResourceName mask;           // expects a 1 channel texture
    Resources::ResourceName albedo;
    Resources::ResourceName normals;
    Resources::ResourceName material;
    Resources::ResourceName mesh;
    float slopeThreshold;                   // slope threshold in percentage
    float heightThreshold;                  // height threshold in percentage
};
 
class VegetationContext : public Graphics::GraphicsContext
{
    __DeclareContext();
public:
 
    VegetationContext();
    ~VegetationContext();
 
    static void Create(const VegetationSetupSettings& settings);
    static void Discard();
 
    static void Setup(Resources::ResourceName heightMap, SizeT numGrassPlanesPerTuft, float grassPatchRadius);
 
    static void SetupGrass(const Graphics::GraphicsEntityId id, const VegetationGrassSetup& setup);
    static void SetupMesh(const Graphics::GraphicsEntityId id, const VegetationMeshSetup& setup);
 
    static void UpdateViewResources(const Ptr<Graphics::View>& view, const Graphics::FrameContext& ctx);
private:
 
    static Graphics::ContextEntityId Alloc();
    static void Dealloc(Graphics::ContextEntityId id);
 
    enum class VegetationType : uint8
    {
        GrassType,      // use for grass and undergrowth
        MeshType        // use for rocks or other objects which might need meshes
    };
 
    enum
    {
        Vegetation_Mask,
        Vegetation_Albedos,
        Vegetation_Normals,
        Vegetation_Materials,
        Vegetation_Meshes,
        Vegetation_GPUInfo,
        Vegetation_TextureIndex,
        Vegetation_SlopeThreshold,
        Vegetation_HeightThreshold,
        Vegetation_Type
    };
 
    typedef Ids::IdAllocator<
        CoreGraphics::TextureId,
        CoreGraphics::TextureId,
        CoreGraphics::TextureId,
        CoreGraphics::TextureId,
        CoreGraphics::MeshId,
        uint,
        IndexT,
        float, float,
        VegetationType
    > VegetationAllocator;
    static VegetationAllocator vegetationAllocator;
};
 
} // namespace Vegetation