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GiantsTools/Sdk/External/DirectXTK/Inc/PrimitiveBatch.h
2021-01-23 15:40:09 -08:00

142 lines
4.8 KiB
C++

//--------------------------------------------------------------------------------------
// File: PrimitiveBatch.h
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkId=248929
//--------------------------------------------------------------------------------------
#pragma once
#if defined(_XBOX_ONE) && defined(_TITLE)
#include <d3d11_x.h>
#else
#include <d3d11_1.h>
#endif
#include <cstdint>
#include <memory>
#include <utility>
namespace DirectX
{
namespace Internal
{
// Base class, not to be used directly: clients should access this via the derived PrimitiveBatch<T>.
class PrimitiveBatchBase
{
protected:
PrimitiveBatchBase(_In_ ID3D11DeviceContext* deviceContext, size_t maxIndices, size_t maxVertices, size_t vertexSize);
PrimitiveBatchBase(PrimitiveBatchBase&& moveFrom) noexcept;
PrimitiveBatchBase& operator= (PrimitiveBatchBase&& moveFrom) noexcept;
PrimitiveBatchBase(PrimitiveBatchBase const&) = delete;
PrimitiveBatchBase& operator= (PrimitiveBatchBase const&) = delete;
virtual ~PrimitiveBatchBase();
public:
// Begin/End a batch of primitive drawing operations.
void __cdecl Begin();
void __cdecl End();
protected:
// Internal, untyped drawing method.
void __cdecl Draw(D3D11_PRIMITIVE_TOPOLOGY topology, bool isIndexed, _In_opt_count_(indexCount) uint16_t const* indices, size_t indexCount, size_t vertexCount, _Out_ void** pMappedVertices);
private:
// Private implementation.
class Impl;
std::unique_ptr<Impl> pImpl;
};
}
// Template makes the API typesafe, eg. PrimitiveBatch<VertexPositionColor>.
template<typename TVertex>
class PrimitiveBatch : public Internal::PrimitiveBatchBase
{
static const size_t DefaultBatchSize = 2048;
public:
explicit PrimitiveBatch(_In_ ID3D11DeviceContext* deviceContext, size_t maxIndices = DefaultBatchSize * 3, size_t maxVertices = DefaultBatchSize)
: PrimitiveBatchBase(deviceContext, maxIndices, maxVertices, sizeof(TVertex))
{ }
PrimitiveBatch(PrimitiveBatch&& moveFrom) noexcept
: PrimitiveBatchBase(std::move(moveFrom))
{ }
PrimitiveBatch& operator= (PrimitiveBatch&& moveFrom) noexcept
{
PrimitiveBatchBase::operator=(std::move(moveFrom));
return *this;
}
PrimitiveBatch(PrimitiveBatch const&) = delete;
PrimitiveBatch& operator= (PrimitiveBatch const&) = delete;
// Similar to the D3D9 API DrawPrimitiveUP.
void Draw(D3D11_PRIMITIVE_TOPOLOGY topology, _In_reads_(vertexCount) TVertex const* vertices, size_t vertexCount)
{
void* mappedVertices;
PrimitiveBatchBase::Draw(topology, false, nullptr, 0, vertexCount, &mappedVertices);
memcpy(mappedVertices, vertices, vertexCount * sizeof(TVertex));
}
// Similar to the D3D9 API DrawIndexedPrimitiveUP.
void DrawIndexed(D3D11_PRIMITIVE_TOPOLOGY topology, _In_reads_(indexCount) uint16_t const* indices, size_t indexCount, _In_reads_(vertexCount) TVertex const* vertices, size_t vertexCount)
{
void* mappedVertices;
PrimitiveBatchBase::Draw(topology, true, indices, indexCount, vertexCount, &mappedVertices);
memcpy(mappedVertices, vertices, vertexCount * sizeof(TVertex));
}
void DrawLine(TVertex const& v1, TVertex const& v2)
{
TVertex* mappedVertices;
PrimitiveBatchBase::Draw(D3D11_PRIMITIVE_TOPOLOGY_LINELIST, false, nullptr, 0, 2, reinterpret_cast<void**>(&mappedVertices));
mappedVertices[0] = v1;
mappedVertices[1] = v2;
}
void DrawTriangle(TVertex const& v1, TVertex const& v2, TVertex const& v3)
{
TVertex* mappedVertices;
PrimitiveBatchBase::Draw(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST, false, nullptr, 0, 3, reinterpret_cast<void**>(&mappedVertices));
mappedVertices[0] = v1;
mappedVertices[1] = v2;
mappedVertices[2] = v3;
}
void DrawQuad(TVertex const& v1, TVertex const& v2, TVertex const& v3, TVertex const& v4)
{
static const uint16_t quadIndices[] = { 0, 1, 2, 0, 2, 3 };
TVertex* mappedVertices;
PrimitiveBatchBase::Draw(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST, true, quadIndices, 6, 4, reinterpret_cast<void**>(&mappedVertices));
mappedVertices[0] = v1;
mappedVertices[1] = v2;
mappedVertices[2] = v3;
mappedVertices[3] = v4;
}
};
}