accelerationstructure.h

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#pragma once
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
#include "mesh.h"
namespace CoreGraphics
{
 
enum class AccelerationStructureBuildFlags
{
    FastBuild = 0x1, // Create and recreate structure swiftly but suffer worse trace performance
    FastTrace = 0x2, // Vice versa of FastBuild, and is exclusive of it
    Dynamic = 0x4,   // Allow updates
    Compact = 0x8,   // Hint to make the structure compact, which can make copys faster
    Small = 0x10,    // Hint to minimize memory spent
};
__ImplementEnumBitOperators(AccelerationStructureBuildFlags);
__ImplementEnumComparisonOperators(AccelerationStructureBuildFlags);
 
struct BlasCreateInfo
{
    CoreGraphics::BufferId vbo, ibo;
    CoreGraphics::IndexType::Code indexType;
    CoreGraphics::VertexComponent::Format positionsFormat;
    IndexT stride;
    IndexT vertexOffset, indexOffset;
    Util::Array<CoreGraphics::PrimitiveGroup> primitiveGroups;
    AccelerationStructureBuildFlags flags;
};
 
ID_24_8_TYPE(BlasId);
_DECL_ACQUIRE_RELEASE(BlasId);
 
BlasId CreateBlas(const BlasCreateInfo& info);
void DestroyBlas(const BlasId blac);
 
enum BlasInstanceFlags
{
    NoFlags = 0x0,
    FaceCullingDisabled = 0x1,
    InvertFace = 0x2,
    ForceOpaque = 0x4,
    NoOpaque = 0x8
};
__ImplementEnumBitOperators(BlasInstanceFlags);
 
ID_24_8_TYPE(BlasInstanceId);
_DECL_ACQUIRE_RELEASE(BlasInstanceId);
struct BlasInstanceCreateInfo
{
    CoreGraphics::BlasId blas;
    Math::mat4 transform;
    uint instanceIndex;         // Readable in the shader as gl_InstanceCustomIndexKHR
    uchar mask;                  // 8 bit visibility mask
    uint shaderOffset;          // Offset into the shader binding table
    BlasInstanceFlags flags;
};
 
BlasInstanceId CreateBlasInstance(const BlasInstanceCreateInfo& info);
void DestroyBlasInstance(const BlasInstanceId id);
void BlasInstanceUpdate(const BlasInstanceId id, const Math::mat4& transform, CoreGraphics::BufferId buf, uint offset);
void BlasInstanceUpdate(const BlasInstanceId id, CoreGraphics::BufferId buf, uint offset);
void BlasInstanceSetMask(const BlasInstanceId id, uint mask);
const SizeT BlasInstanceGetSize();
 
struct TlasCreateInfo
{
    SizeT numInstances;
    CoreGraphics::BufferId instanceBuffer;
    AccelerationStructureBuildFlags flags;
};
 
ID_24_8_TYPE(TlasId);
 
TlasId CreateTlas(const TlasCreateInfo& info);
void DestroyTlas(const TlasId tlas);
 
void TlasInitBuild(const TlasId tlas);
void TlasInitUpdate(const TlasId tlas);
 
} // namespace CoreGraphics