feat(d3d12): 实现渲染目标纹理和深度缓冲区

核心变更： - 实现 d3d12_render_texture 类，支持多 Mip 级别 RTV - 实现 d3d12_depth_buffer 类，支持 DSV 和 SRV 双视图 - 为所有纹理类添加析构函数，确保资源自动释放 - 深度缓冲区格式转换处理（D32_FLOAT -> R32_TYPELESS）文档完善： - 新增变更记录文档 - 更新 D3D12 学习 Wiki，添加渲染目标纹理和深度缓冲区章节
2026-04-01 17:00:09 +08:00
parent 4d13d8df89
commit 188a8aea2f
4 changed files with 507 additions and 0 deletions
--- a/Engine/Graphics/Direct3D12/D3D12Resource.cpp
+++ b/Engine/Graphics/Direct3D12/D3D12Resource.cpp
@@ -194,6 +194,83 @@ d3d12_texture::release()
 }

 ////////////	D3D12  RENDER TEXTURE     ////////////
+d3d12_render_texture::d3d12_render_texture(d3d12_texture_init_info info)
+    : _texture(info)
+{
+    assert(info.desc);
+    _mip_count = resource()->GetDesc().MipLevels;
+    assert(_mip_count && _mip_count <= d3d12_texture::max_mips);
+
+    descriptor_heap& rtv_heap {core::rtv_heap()};
+    D3D12_RENDER_TARGET_VIEW_DESC desc{};
+    desc.Format = info.desc->Format;
+    desc.ViewDimension = D3D12_RTV_DIMENSION_TEXTURE2D;
+    desc.Texture2D.MipSlice = 0;
+
+    auto *const device {core::device()};
+    assert(device);
+    for(u32 i{0}; i<_mip_count;++i)
+    {
+        _rtv[i] = rtv_heap.allocate();
+        device->CreateRenderTargetView(resource(), &desc, _rtv[i].cpu);
+        ++desc.Texture2D.MipSlice;
+    }
+}
+
+void
+d3d12_render_texture::release()
+{
+    for(u32 i{0}; i<_mip_count;++i) core::srv_heap().free(_rtv[i]);
+    _texture.release();
+    _mip_count = 0;
+}
+
+////////////	D3D12  DEPTH TEXTURE     ////////////
+d3d12_depth_buffer::d3d12_depth_buffer(d3d12_texture_init_info info)
+    : _texture(info)
+{
+    assert(info.desc);
+    const DXGI_FORMAT dsv_format {info.desc->Format};
+
+    D3D12_SHADER_RESOURCE_VIEW_DESC srv_desc{};
+    if(info.desc->Format == DXGI_FORMAT_D32_FLOAT)
+    {
+        info.desc->Format = DXGI_FORMAT_R32_TYPELESS;
+        srv_desc.Format = DXGI_FORMAT_R32_FLOAT;
+    }
+    
+    srv_desc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+    srv_desc.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+    srv_desc.Texture2D.MipLevels = 1;
+    srv_desc.Texture2D.MostDetailedMip = 0;
+    srv_desc.Texture2D.PlaneSlice = 0;
+    srv_desc.Texture2D.ResourceMinLODClamp = 0.f;
+
+    assert(!info.srv_desc && !info.resource);
+    info.srv_desc = &srv_desc;
+    _texture = d3d12_texture(info);
+
+    D3D12_DEPTH_STENCIL_VIEW_DESC dsv_desc{};
+    dsv_desc.ViewDimension = D3D12_DSV_DIMENSION_TEXTURE2D;
+    dsv_desc.Flags = D3D12_DSV_FLAG_NONE;
+    dsv_desc.Format = dsv_format;
+    dsv_desc.Texture2D.MipSlice = 0;
+
+    _dsv = core::dsv_heap().allocate();
+    auto *const device {core::device()};
+    assert(device);
+    device->CreateDepthStencilView(resource(), &dsv_desc, _dsv.cpu);
+
+
+}
+void
+d3d12_depth_buffer::release()
+{
+    core::dsv_heap().free(_dsv);
+    _texture.release();
+    _dsv = {};
+}
+


 } //XEngine::graphics::d3d12