291 lines
11 KiB
C++
291 lines
11 KiB
C++
#include <basalt_export.hpp>
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#include <directx_util.hpp>
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#include <engine.hpp>
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#include <windows.h>
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#include <d3d11.h>
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#include <d3dcompiler.h>
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#include <wrl/client.h>
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#include <vector>
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#include <iostream>
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using Microsoft::WRL::ComPtr;
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#define DXCHK(condition) \
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if (FAILED(condition)) { \
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throw std::runtime_error("bad DirectX calling"); \
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}
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// 立方体顶点（位置）
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struct Vertex {
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float x, y, z;
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};
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// 立方体顶点
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Vertex CubeVertices[] = {
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// 前面
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{-1, -1, -1},
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{1, -1, -1},
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{1, 1, -1},
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{-1, -1, -1},
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{1, 1, -1},
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{-1, 1, -1},
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// 后面
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{-1, -1, 1},
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{-1, 1, 1},
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{1, 1, 1},
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{-1, -1, 1},
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{1, 1, 1},
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{1, -1, 1},
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// 左面
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{-1, -1, -1},
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{-1, -1, 1},
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{-1, 1, 1},
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{-1, -1, -1},
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{-1, 1, 1},
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{-1, 1, -1},
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// 右面
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{1, -1, -1},
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{1, 1, -1},
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{1, 1, 1},
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{1, -1, -1},
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{1, 1, 1},
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{1, -1, 1},
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// 顶面
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{-1, 1, -1},
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{1, 1, -1},
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{1, 1, 1},
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{-1, 1, -1},
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{1, 1, 1},
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{-1, 1, 1},
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// 底面
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{-1, -1, -1},
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{-1, -1, 1},
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{1, -1, 1},
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{-1, -1, -1},
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{1, -1, 1},
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{1, -1, -1}
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};
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// 简单顶点着色器（只传位置）
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const char* g_VS = R"(
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float4 main(float3 pos : POSITION) : SV_POSITION {
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return float4(pos, 1.0f);
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}
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)";
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// 简单像素着色器（返回固定颜色）
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const char* g_PS = R"(
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float4 main() : SV_TARGET {
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return float4(0.2f, 0.4f, 0.8f, 1.0f);
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}
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)";
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using ::Basalt::Shared::Engine::EngineConfig;
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using ::Basalt::Shared::Engine::IEngine;
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namespace DxUtil = ::Basalt::Shared::DirectX;
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class DirectX11Engine : public IEngine {
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public:
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DirectX11Engine() : IEngine() {}
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virtual ~DirectX11Engine() {}
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private:
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ComPtr<ID3D11Device> device; ///< 设备
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ComPtr<ID3D11DeviceContext> context; ///< 上下文
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ComPtr<IDXGISwapChain> swap_chain; ///< 交换链
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ComPtr<ID3D11RenderTargetView> rtv; ///< 渲染目标视图
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ComPtr<ID3D11Texture2D> back_buffer; ///< 后缓冲
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ComPtr<ID3D11Texture2D> depth_buffer; ///< 深度缓冲
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ComPtr<ID3D11DepthStencilView> dsv; ///< 深度模板视图
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ComPtr<ID3D11Texture2D> depth_staging; ///< 用于CPU读取的深度暂存纹理
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ComPtr<ID3D11VertexShader> vs; ///< 顶点着色器
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ComPtr<ID3D11PixelShader> ps; ///< 像素着色器
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ComPtr<ID3DBlob> vs_blob; ///< 顶点着色器字节码
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ComPtr<ID3DBlob> ps_blob; ///< 像素着色器字节码
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ComPtr<ID3D11InputLayout> input_layout; ///< 输入布局
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ComPtr<ID3D11Buffer> vertex_buffer; ///< 顶点缓冲
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ComPtr<ID3D11DepthStencilState> depth_state; ///< 深度状态
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std::vector<BYTE> depth_data; ///< 深度数据
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public:
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virtual void Startup(EngineConfig&& config) override {
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IEngine::Startup(std::move(config));
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// 初始化 COM
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DXCHK(CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED));
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// 创建设备和上下文
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DXCHK(D3D11CreateDevice(nullptr,
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D3D_DRIVER_TYPE_HARDWARE,
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nullptr,
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D3D11_CREATE_DEVICE_DEBUG,
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nullptr,
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0,
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D3D11_SDK_VERSION,
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&device,
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nullptr,
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&context));
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// 创建交换链（窗口可选，这里仅用于渲染上下文）
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DXGI_SWAP_CHAIN_DESC sd = {};
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sd.BufferDesc.Width = this->config.width;
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sd.BufferDesc.Height = this->config.height;
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sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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sd.SampleDesc.Count = 1;
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sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
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sd.BufferCount = 1;
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sd.OutputWindow = DxUtil::CreateRenderWindow(this->config.width, this->config.height, this->config.title); // 创建窗口
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sd.Windowed = TRUE;
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ComPtr<IDXGIDevice> dxgi_device;
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DXCHK(device.As(&dxgi_device));
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ComPtr<IDXGIAdapter> adapter;
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DXCHK(dxgi_device->GetAdapter(&adapter));
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ComPtr<IDXGIFactory> factory;
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DXCHK(adapter->GetParent(IID_PPV_ARGS(&factory)));
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DXCHK(factory->CreateSwapChain(device.Get(), &sd, &swap_chain));
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// 创建渲染目标
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DXCHK(swap_chain->GetBuffer(0, IID_PPV_ARGS(&back_buffer)));
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DXCHK(device->CreateRenderTargetView(back_buffer.Get(), nullptr, &rtv));
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// 创建深度缓冲（D32_FLOAT）
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D3D11_TEXTURE2D_DESC depth_desc = {};
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depth_desc.Width = this->config.width;
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depth_desc.Height = this->config.height;
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depth_desc.MipLevels = 1;
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depth_desc.ArraySize = 1;
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depth_desc.Format = DXGI_FORMAT_D32_FLOAT;
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depth_desc.SampleDesc.Count = 1;
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depth_desc.Usage = D3D11_USAGE_DEFAULT;
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depth_desc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
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DXCHK(device->CreateTexture2D(&depth_desc, nullptr, &depth_buffer));
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DXCHK(device->CreateDepthStencilView(depth_buffer.Get(), nullptr, &dsv));
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// 创建 staging texture 用于 CPU 读取深度（R32_FLOAT）
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D3D11_TEXTURE2D_DESC staging_desc = depth_desc;
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staging_desc.Format = DXGI_FORMAT_R32_FLOAT; // 注意：DSV 用 D32_FLOAT，staging 用 R32_FLOAT
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staging_desc.BindFlags = 0;
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staging_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
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staging_desc.Usage = D3D11_USAGE_STAGING;
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DXCHK(device->CreateTexture2D(&staging_desc, nullptr, &depth_staging));
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// 编译并创建着色器
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DXCHK(D3DCompile(g_VS, static_cast<UINT>(strlen(g_VS)), nullptr, nullptr, nullptr, "main", "vs_4_0", 0, 0, &vs_blob, nullptr));
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DXCHK(D3DCompile(g_PS, static_cast<UINT>(strlen(g_PS)), nullptr, nullptr, nullptr, "main", "ps_4_0", 0, 0, &ps_blob, nullptr));
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DXCHK(device->CreateVertexShader(vs_blob->GetBufferPointer(), vs_blob->GetBufferSize(), nullptr, &vs));
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DXCHK(device->CreatePixelShader(ps_blob->GetBufferPointer(), ps_blob->GetBufferSize(), nullptr, &ps));
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// 输入布局
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D3D11_INPUT_ELEMENT_DESC layout[] = {{"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0}};
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DXCHK(device->CreateInputLayout(layout, 1, vs_blob->GetBufferPointer(), vs_blob->GetBufferSize(), &input_layout));
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// 顶点缓冲
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D3D11_BUFFER_DESC vb_desc = {};
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vb_desc.ByteWidth = sizeof(CubeVertices);
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vb_desc.Usage = D3D11_USAGE_DEFAULT;
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vb_desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
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D3D11_SUBRESOURCE_DATA vb_data = {CubeVertices};
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DXCHK(device->CreateBuffer(&vb_desc, &vb_data, &vertex_buffer));
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// 深度测试启用
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D3D11_DEPTH_STENCIL_DESC ds_desc = {};
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ds_desc.DepthEnable = TRUE;
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ds_desc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
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ds_desc.DepthFunc = D3D11_COMPARISON_LESS;
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DXCHK(device->CreateDepthStencilState(&ds_desc, &depth_state));
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// 视口
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D3D11_VIEWPORT vp;
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ZeroMemory(&vp, sizeof(D3D11_VIEWPORT));
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vp.TopLeftX = 0;
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vp.TopLeftY = 0;
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vp.Width = (float) this->config.width;
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vp.Height = (float) this->config.height;
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vp.MinDepth = 0.0f;
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vp.MaxDepth = 1.0f;
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context->RSSetViewports(1, &vp); // RSSetViewports doesn't return HRESULT, so no need to wrap
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//// 打开命名管道（需另一进程已创建）
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//constexpr const wchar_t* PipeName = L"\\\\.\\pipe\\54da494c-301a-47a9-9d67-4fbebaeda8cf";
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//hPipe = CreateFileW(PipeName, GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, 0, nullptr);
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//if (hPipe == INVALID_HANDLE_VALUE) {
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// std::cerr << "Failed to open named pipe. Ensure another process created it.\n";
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// return;
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//}
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// 缩放深度数据数组到指定大小
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depth_data.resize(this->config.width * this->config.height * sizeof(float));
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// 设置管线
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context->OMSetRenderTargets(1, rtv.GetAddressOf(), dsv.Get());
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context->OMSetDepthStencilState(depth_state.Get(), 1);
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context->VSSetShader(vs.Get(), nullptr, 0);
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context->PSSetShader(ps.Get(), nullptr, 0);
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context->IASetInputLayout(input_layout.Get());
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UINT stride = sizeof(Vertex), offset = 0;
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context->IASetVertexBuffers(0, 1, vertex_buffer.GetAddressOf(), &stride, &offset);
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context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
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//frameCount = 0;
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}
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virtual void Tick() override {
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IEngine::Tick();
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// 清屏
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float clear_color[] = {0.8f, 0.1f, 0.1f, 1.0f};
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context->ClearRenderTargetView(rtv.Get(), clear_color);
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//context->ClearDepthStencilView(dsv.Get(), D3D11_CLEAR_DEPTH, 1.0f, 0);
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//// 设置管线
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//context->OMSetRenderTargets(1, rtv.GetAddressOf(), dsv.Get());
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//context->OMSetDepthStencilState(depth_state.Get(), 1);
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//context->VSSetShader(vs.Get(), nullptr, 0);
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//context->PSSetShader(ps.Get(), nullptr, 0);
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//context->IASetInputLayout(input_layout.Get());
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//UINT stride = sizeof(Vertex), offset = 0;
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//context->IASetVertexBuffers(0, 1, vertex_buffer.GetAddressOf(), &stride, &offset);
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//context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
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// 绘制立方体
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context->Draw(sizeof(CubeVertices) / sizeof(Vertex), 0); // 自动计算顶点数
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//// 复制深度缓冲到 staging texture
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//context->CopyResource(depth_staging.Get(), depth_buffer.Get());
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//// Map 获取数据
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//D3D11_MAPPED_SUBRESOURCE mapped;
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//DXCHK(context->Map(depth_staging.Get(), 0, D3D11_MAP_READ, 0, &mapped));
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//memcpy(depth_data.data(), mapped.pData, this->config.width * this->config.height * sizeof(float));
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//context->Unmap(depth_staging.Get(), 0);
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//// 写入命名管道
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//DWORD written;
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//if (!WriteFile(hPipe, depth_data.data(), static_cast<DWORD>(this->config.width * this->config.height * sizeof(float)), &written, nullptr) || written != this->config.width * this->config.height * sizeof(float)) {
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// std::cerr << "WriteFile failed or incomplete.\n";
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//}
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// 呈现（可选）
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DXCHK(swap_chain->Present(0, 0));
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//frameCount++;
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}
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virtual void Shutdown() override {
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IEngine::Shutdown();
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//if (hPipe != INVALID_HANDLE_VALUE) {
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// CloseHandle(hPipe);
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//}
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CoUninitialize();
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}
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};
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BS_EXPORT void* BSCreateInstance() {
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return new DirectX11Engine();
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}
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BS_EXPORT void BSDestroyInstance(void* instance) {
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delete reinterpret_cast<DirectX11Engine*>(instance);
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} |