Can't get antialiased picture from Direct3D

Question

I'm taking my first steps in programming with Direct3D. I have a very basic pipeline setup, and all I want to get from it is an antialiased smooth image. But I get this:

First, I can't get rid of stair effect though I have 4x MSAA enabled already in my pipeline (DXGI_SAMPLE_DESC::Count is 4 and Quality is 0):

And second, I get this noisy texturing though I have mipmaps generated and LINEAR filtering set in the sampler state.

Am I missing something or doing wrong?

Here is my code:

1) Renderer class:

#include "Scene.h" // Custom class that contains vertex and index buffer contents for every rendered mesh.
#include "Camera.h" // Custom class that contains camera position and fov.

#include <wrl/client.h>
using Microsoft::WRL::ComPtr;

#include <DirectXMath.h>
using namespace DirectX;

#include <map>

#include "generated\VertexShader.h"
#include "generated\PixelShader.h"

class Renderer
{
public:
    Renderer(HWND hWnd, int wndWidth, int wndHeight, const Scene& scene, const Camera& camera);

    void Render();

    void SwitchToWireframe();
    void SwitchToSolid();

protected:
    void CreateDeviceAndSwapChain();
    void CreateDepthStencil();
    void CreateInputLayout();
    void CreateVertexShader();
    void CreatePixelShader();
    void CreateRasterizerStates();
    void CreateBlendState();
    void CreateSamplerState();
    void CreateBuffer(ID3D11Buffer** buffer, 
        D3D11_USAGE usage, D3D11_BIND_FLAG bindFlags,
        UINT cpuAccessFlags, UINT miscFlags,
        UINT sizeOfBuffer, UINT sizeOfBufferElement, const void* initialData);
    void CreateTexture2DAndSRV(const Scene::Texture& texture, ID3D11ShaderResourceView** view);
    void CreateTexturesAndViews();
    void GenerateMips();

protected:
    const Scene& m_scene;

    const Camera& m_camera;
    DWORD m_cameraLastUpdateTickCount;

    HWND m_windowHandle;
    int m_windowWidth; 
    int m_windowHeight;

    DXGI_SAMPLE_DESC m_sampleDesc;

    ComPtr<IDXGISwapChain> m_swapChain;
    ComPtr<ID3D11Texture2D> m_swapChainBuffer;
    ComPtr<ID3D11RenderTargetView> m_swapChainBufferRTV;
    ComPtr<ID3D11Device> m_device;
    ComPtr<ID3D11DeviceContext> m_deviceContext;
    ComPtr<ID3D11Debug> m_debugger;
    ComPtr<ID3D11Texture2D> m_depthStencilTexture;
    ComPtr<ID3D11DepthStencilState> m_depthStencilState;
    ComPtr<ID3D11DepthStencilView> m_depthStencilView;
    ComPtr<ID3D11InputLayout> m_inputLayout;
    ComPtr<ID3D11VertexShader> m_vertexShader;
    ComPtr<ID3D11PixelShader> m_pixelShader;
    ComPtr<ID3D11RasterizerState> m_solidRasterizerState;
    ComPtr<ID3D11RasterizerState> m_wireframeRasterizerState;
    ComPtr<ID3D11BlendState> m_blendState;
    ComPtr<ID3D11SamplerState> m_linearSamplerState;

    std::map<std::string, ComPtr<ID3D11ShaderResourceView>> m_diffuseMapViews;
    std::map<std::string, ComPtr<ID3D11ShaderResourceView>> m_normalMapViews;

    XMMATRIX m_worldViewMatrix;

    ID3D11RasterizerState* m_currentRasterizerState;
};

void Renderer::CreateDeviceAndSwapChain()
{
    HRESULT hr;

    DXGI_SWAP_CHAIN_DESC swapChainDesc = {};
    swapChainDesc.BufferDesc.Width = m_windowWidth;
    swapChainDesc.BufferDesc.Height = m_windowHeight;
    swapChainDesc.BufferDesc.RefreshRate.Numerator = 1;
    swapChainDesc.BufferDesc.RefreshRate.Denominator = 60;
    swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
    swapChainDesc.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_PROGRESSIVE;
    swapChainDesc.BufferDesc.Scaling = DXGI_MODE_SCALING_CENTERED;
    swapChainDesc.SampleDesc = m_sampleDesc;
    swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
    swapChainDesc.BufferCount = 1;
    swapChainDesc.OutputWindow = m_windowHandle;
    swapChainDesc.Windowed = TRUE;
    swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
    swapChainDesc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;

    D3D_FEATURE_LEVEL desiredFeatureLevels[] = { D3D_FEATURE_LEVEL_10_1 };
    D3D_FEATURE_LEVEL featureLevel;

    hr = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL,
        D3D11_CREATE_DEVICE_DEBUG | D3D11_CREATE_DEVICE_PREVENT_INTERNAL_THREADING_OPTIMIZATIONS,
        desiredFeatureLevels, 1, D3D11_SDK_VERSION, &swapChainDesc,
        m_swapChain.GetAddressOf(), m_device.GetAddressOf(), &featureLevel, 
        m_deviceContext.GetAddressOf());

    if (FAILED(hr))
    {
        hr = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_WARP, NULL,
            D3D11_CREATE_DEVICE_DEBUG | D3D11_CREATE_DEVICE_PREVENT_INTERNAL_THREADING_OPTIMIZATIONS,
            desiredFeatureLevels, 1, D3D11_SDK_VERSION, &swapChainDesc,
            m_swapChain.GetAddressOf(), m_device.GetAddressOf(), &featureLevel,
            m_deviceContext.GetAddressOf());
    }

    if (FAILED(hr))
        throw std::exception("Failed to create device or swap chain");

    hr = m_device->QueryInterface(m_debugger.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to get debugger interface");

    hr = m_swapChain->GetBuffer(0, __uuidof(m_swapChainBuffer),
        (void**)m_swapChainBuffer.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to get swap chain buffer");

    hr = m_device->CreateRenderTargetView(m_swapChainBuffer.Get(), NULL, 
        m_swapChainBufferRTV.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create RTV for swap chain buffer");
}

void Renderer::CreateDepthStencil()
{
    HRESULT hr;

    D3D11_TEXTURE2D_DESC tdesc;
    tdesc.Width = m_windowWidth;
    tdesc.Height = m_windowHeight;
    tdesc.MipLevels = 1;
    tdesc.ArraySize = 1;
    tdesc.Format = DXGI_FORMAT_D16_UNORM;
    tdesc.SampleDesc = m_sampleDesc;
    tdesc.Usage = D3D11_USAGE_DEFAULT;
    tdesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
    tdesc.CPUAccessFlags = 0;
    tdesc.MiscFlags = 0;

    hr = m_device->CreateTexture2D(&tdesc, NULL, m_depthStencilTexture.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create depth stencil texture");

    D3D11_DEPTH_STENCIL_VIEW_DESC dsvdesc;
    dsvdesc.Format = DXGI_FORMAT_D16_UNORM;
    dsvdesc.ViewDimension = m_sampleDesc.Count > 1 
        ? D3D11_DSV_DIMENSION_TEXTURE2DMS 
        : D3D11_DSV_DIMENSION_TEXTURE2D;
    dsvdesc.Flags = 0;
    dsvdesc.Texture2D.MipSlice = 0;

    hr = m_device->CreateDepthStencilView(m_depthStencilTexture.Get(), &dsvdesc, 
        m_depthStencilView.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create depth stencil view");

    D3D11_DEPTH_STENCIL_DESC dsdesc;
    dsdesc.DepthEnable = TRUE;
    dsdesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
    dsdesc.DepthFunc = D3D11_COMPARISON_LESS;
    dsdesc.StencilEnable = FALSE;
    dsdesc.StencilReadMask = 0;
    dsdesc.StencilWriteMask = 0;
    dsdesc.FrontFace = {};
    dsdesc.BackFace = {};

    hr = m_device->CreateDepthStencilState(&dsdesc, m_depthStencilState.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create depth stencil state");
}

void Renderer::CreateInputLayout()
{
    HRESULT hr;

    D3D11_INPUT_ELEMENT_DESC iedescs[] = {
        { "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
    { "NORMAL", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
    { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
    };

    hr = m_device->CreateInputLayout(iedescs, 3,
        g_vertexShader, sizeof(g_vertexShader),
        m_inputLayout.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create input layout");
}

void Renderer::CreateVertexShader()
{
    HRESULT hr;

    hr = m_device->CreateVertexShader(g_vertexShader, sizeof(g_vertexShader), 
        NULL, m_vertexShader.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create vertex shader");
}

void Renderer::CreatePixelShader()
{
    HRESULT hr;

    hr = m_device->CreatePixelShader(g_pixelShader, sizeof(g_pixelShader), 
        NULL, m_pixelShader.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create pixel shader");
}

void Renderer::CreateRasterizerStates()
{
    HRESULT hr;

    D3D11_RASTERIZER_DESC rdesc;
    rdesc.FillMode = D3D11_FILL_SOLID;
    rdesc.CullMode = D3D11_CULL_FRONT;
    rdesc.FrontCounterClockwise = FALSE;
    rdesc.DepthBias = 0;
    rdesc.DepthBiasClamp = 0.0f;
    rdesc.SlopeScaledDepthBias = 0.0f;
    rdesc.DepthClipEnable = TRUE;
    rdesc.ScissorEnable = FALSE;
    rdesc.MultisampleEnable = m_sampleDesc.Count > 1 ? TRUE : FALSE;
    rdesc.AntialiasedLineEnable = m_sampleDesc.Count > 1 ? TRUE : FALSE;

    hr = m_device->CreateRasterizerState(&rdesc, m_solidRasterizerState.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create rasterizer state");

    rdesc.FillMode = D3D11_FILL_WIREFRAME;

    hr = m_device->CreateRasterizerState(&rdesc, m_wireframeRasterizerState.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create rasterizer state");

    m_currentRasterizerState = m_solidRasterizerState.Get();
}

void Renderer::CreateSamplerState()
{
    HRESULT hr;

    D3D11_SAMPLER_DESC smdesc;
    smdesc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
    smdesc.AddressU = D3D11_TEXTURE_ADDRESS_WRAP;
    smdesc.AddressV = D3D11_TEXTURE_ADDRESS_WRAP;
    smdesc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;
    smdesc.MipLODBias = 0.0f;
    smdesc.MaxAnisotropy = 0;
    smdesc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
    smdesc.BorderColor[4] = {};
    FLOAT MinLOD = 0.0;
    FLOAT MaxLOD = 0.0;

    hr = m_device->CreateSamplerState(&smdesc, m_linearSamplerState.GetAddressOf());

    if (FAILED(hr))
        throw new std::exception("Failed to create sampler state");
}

void Renderer::CreateBlendState()
{
    HRESULT hr;

    D3D11_BLEND_DESC bdesc;
    bdesc.AlphaToCoverageEnable = FALSE;
    bdesc.IndependentBlendEnable = FALSE;
    bdesc.RenderTarget[0].BlendEnable = FALSE;
    bdesc.RenderTarget[0].SrcBlend = D3D11_BLEND_ONE;
    bdesc.RenderTarget[0].DestBlend = D3D11_BLEND_ZERO;
    bdesc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
    bdesc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
    bdesc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
    bdesc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
    bdesc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;

    hr = m_device->CreateBlendState(&bdesc, m_blendState.GetAddressOf());

    if (FAILED(hr))
        throw std::exception("Failed to create blend state");
}

 void Renderer::CreateBuffer(ID3D11Buffer** buffer, 
     D3D11_USAGE usage, D3D11_BIND_FLAG bindFlags,
    UINT cpuAccessFlags, UINT miscFlags, 
    UINT sizeOfBuffer, UINT sizeOfBufferElement, const void* initialData)
{
    HRESULT hr;

    D3D11_BUFFER_DESC bdesc;
    bdesc.ByteWidth = sizeOfBuffer;
    bdesc.Usage = usage;
    bdesc.BindFlags = bindFlags;
    bdesc.CPUAccessFlags = cpuAccessFlags;
    bdesc.MiscFlags = miscFlags;
    bdesc.StructureByteStride = sizeOfBufferElement;

    D3D11_SUBRESOURCE_DATA bdata;
    bdata.pSysMem = initialData;
    bdata.SysMemPitch = 0;
    bdata.SysMemSlicePitch = 0;

    hr = m_device->CreateBuffer(&bdesc, &bdata, buffer);

    if (FAILED(hr))
        throw std::exception("Failed to create buffer");
}

 void Renderer::CreateTexture2DAndSRV(const Scene::Texture& sceneTexture, ID3D11ShaderResourceView** view)
 {
     HRESULT hr;

     constexpr DXGI_FORMAT texformat = DXGI_FORMAT_R32G32B32A32_FLOAT;

     D3D11_TEXTURE2D_DESC tdesc;
     tdesc.Width = sceneTexture.width;
     tdesc.Height = sceneTexture.height;
     tdesc.MipLevels = 0;
     tdesc.ArraySize = 1;
     tdesc.Format = texformat;
     tdesc.SampleDesc.Count = 1;
     tdesc.SampleDesc.Quality = 0;
     tdesc.Usage = D3D11_USAGE_DEFAULT;
     tdesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
     tdesc.CPUAccessFlags = 0;
     tdesc.MiscFlags = D3D11_RESOURCE_MISC_GENERATE_MIPS;

     ComPtr<ID3D11Texture2D> texture2d;

     hr = m_device->CreateTexture2D(&tdesc, NULL, texture2d.GetAddressOf());

     if (FAILED(hr))
         throw std::exception("Failed to create texture");


     D3D11_SUBRESOURCE_DATA srdata;
     srdata.pSysMem = sceneTexture.data;
     srdata.SysMemPitch = sceneTexture.width * sizeof(float) * 4;
     srdata.SysMemSlicePitch = 0;

     m_deviceContext->UpdateSubresource(texture2d.Get(), 0, NULL, 
         srdata.pSysMem, srdata.SysMemPitch, srdata.SysMemSlicePitch);


     D3D11_SHADER_RESOURCE_VIEW_DESC srvdesc;
     srvdesc.Format = texformat;
     srvdesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
     srvdesc.Texture2D.MostDetailedMip = 0;
     srvdesc.Texture2D.MipLevels = -1;

     ComPtr<ID3D11ShaderResourceView> shaderResourceView;

     hr = m_device->CreateShaderResourceView(texture2d.Get(), &srvdesc, view);

     if (FAILED(hr))
         throw std::exception("Failed to create shader resource view");
 }

 void Renderer::CreateTexturesAndViews()
 {
     for (auto it = m_scene.materials.cbegin(); it != m_scene.materials.cend(); it++)
     {
         //don't know what's the problem but if I don't place initialized ComPtr<...> instance into a map
         //then further .GetAddessOf() fails.
         m_diffuseMapViews.emplace(it->first, ComPtr<ID3D11ShaderResourceView>());
         m_normalMapViews.emplace(it->first, ComPtr<ID3D11ShaderResourceView>()); 

         CreateTexture2DAndSRV(it->second.diffuseMap, m_diffuseMapViews[it->first].GetAddressOf());
         CreateTexture2DAndSRV(it->second.normalMap, m_normalMapViews[it->first].GetAddressOf());
     }
 }

 void Renderer::GenerateMips()
 {
     for (auto it = m_diffuseMapViews.begin(); it != m_diffuseMapViews.end(); it++)
         m_deviceContext->GenerateMips(it->second.Get());
     for (auto it = m_normalMapViews.begin(); it != m_normalMapViews.end(); it++)
         m_deviceContext->GenerateMips(it->second.Get());
 }

Renderer::Renderer(HWND hWnd, int windowWidth, int windowHeight, 
    const Scene& scene, const Camera& camera)
    : m_scene(scene)
    , m_camera(camera)
    , m_cameraLastUpdateTickCount(0)
    , m_windowHandle(hWnd)
    , m_windowWidth(windowWidth)
    , m_windowHeight(windowHeight)
{
    m_sampleDesc.Count = 4;
    m_sampleDesc.Quality = 0;

    CreateDeviceAndSwapChain();
    CreateDepthStencil();
    CreateInputLayout();
    CreateVertexShader();
    CreatePixelShader();
    CreateRasterizerStates();
    CreateBlendState();
    CreateSamplerState();
    CreateTexturesAndViews();
    GenerateMips();

    // Setting up IA stage

    m_deviceContext->IASetPrimitiveTopology(
        D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

    m_deviceContext->IASetInputLayout(m_inputLayout.Get());

    // Setting up VS stage

    m_deviceContext->VSSetShader(m_vertexShader.Get(), 0, 0);

    // Setting up RS stage

    D3D11_VIEWPORT viewport;
    viewport.TopLeftX = 0.0f;
    viewport.TopLeftY = 0.0f;
    viewport.Width = static_cast<FLOAT>(m_windowWidth);
    viewport.Height = static_cast<FLOAT>(m_windowHeight);
    viewport.MinDepth = 0.0f;
    viewport.MaxDepth = 1.0f;

    m_deviceContext->RSSetViewports(1, &viewport);

    // Setting up PS stage

    m_deviceContext->PSSetSamplers(0, 1, m_linearSamplerState.GetAddressOf());
    m_deviceContext->PSSetShader(m_pixelShader.Get(), 0, 0);

    // Setting up OM stage

    m_deviceContext->OMSetBlendState(m_blendState.Get(), NULL, 0xffffffff);
    m_deviceContext->OMSetDepthStencilState(m_depthStencilState.Get(), 0);
    m_deviceContext->OMSetRenderTargets(1, m_swapChainBufferRTV.GetAddressOf(), m_depthStencilView.Get());
}

void Renderer::Render()
{
    constexpr float background[4] = { 0.047f, 0.0487f, 0.066f, 1.0f };

    // Setting up view matix

    if (m_cameraLastUpdateTickCount
        != m_camera.GetLastUpdateTickCount())
    {
        const Float3& camFrom = m_camera.GetFrom();
        const Float3& camAt = m_camera.GetAt();
        const Float3& camUp = m_camera.GetUp();

        m_cameraLastUpdateTickCount = m_camera.GetLastUpdateTickCount();

        FXMVECTOR from = XMVectorSet(camFrom.x, camFrom.y, camFrom.z, 1.0f);
        FXMVECTOR at = XMVectorSet(camAt.x, camAt.y, camAt.z, 1.0f);
        FXMVECTOR up = XMVectorSet(camUp.x, camUp.y, camUp.z, 0.0f);

        FXMVECTOR dir = XMVectorSubtract(at, from);

        FXMVECTOR x = XMVector3Cross(dir, up);
        FXMVECTOR up2 = XMVector3Cross(x, dir);

        XMMATRIX lookTo = XMMatrixLookToRH(from, dir, up2);

        float scalef = 1.0f / XMVectorGetByIndex(XMVector3Length(dir), 0);

        XMMATRIX scale = XMMatrixScaling(scalef, scalef, scalef);

        float aspect = float(m_windowWidth) / m_windowHeight;
        float fov = m_camera.GetFov() / 180.0f * 3.14f;

        XMMATRIX persp = XMMatrixPerspectiveFovRH(fov, aspect, 0.1f, 1000.0f);

        m_worldViewMatrix = XMMatrixMultiply(XMMatrixMultiply(lookTo, scale), persp);
    }
    else
    {
        return;
    }

    m_deviceContext->ClearDepthStencilView(m_depthStencilView.Get(), D3D11_CLEAR_DEPTH, 1.0f, 0);
    m_deviceContext->ClearRenderTargetView(m_swapChainBufferRTV.Get(), background);

    for (auto imesh = m_scene.meshes.cbegin(); imesh != m_scene.meshes.cend(); imesh++)
    {
        // Creating vertex buffer

        ComPtr<ID3D11Buffer> vertexBuffer;

        CreateBuffer(vertexBuffer.GetAddressOf(), 
            D3D11_USAGE_DEFAULT, D3D11_BIND_VERTEX_BUFFER, 0, 0,
            sizeof(Scene::Vertex) * imesh->vertices.size(), sizeof(Scene::Vertex),
            imesh->vertices.data());

        // Creating index buffer

        ComPtr<ID3D11Buffer> indexBuffer;

        CreateBuffer(indexBuffer.GetAddressOf(),
            D3D11_USAGE_DEFAULT, D3D11_BIND_INDEX_BUFFER, 0, 0,
            sizeof(unsigned int) * imesh->indices.size(), sizeof(unsigned int),
            imesh->indices.data());

        // Creating constant buffer

        ComPtr<ID3D11Buffer> constantBuffer;

        CreateBuffer(constantBuffer.GetAddressOf(),
            D3D11_USAGE_IMMUTABLE, D3D11_BIND_CONSTANT_BUFFER, 0, 0,
            sizeof(XMMATRIX), sizeof(XMMATRIX),
            &m_worldViewMatrix);

        // Setting up IA stage

        ID3D11Buffer* vertexBuffers[8] = { vertexBuffer.Get() };
        unsigned int vertexBufferStrides[8] = { sizeof(Scene::Vertex) };
        unsigned int vertexBufferOffsets[8] = { 0 };

        m_deviceContext->IASetVertexBuffers(0, 8,
            vertexBuffers, vertexBufferStrides, vertexBufferOffsets);

        m_deviceContext->IASetIndexBuffer(indexBuffer.Get(), DXGI_FORMAT_R32_UINT, 0);

        // Setting up VS stage

        m_deviceContext->VSSetConstantBuffers(0, 1, constantBuffer.GetAddressOf());

        // Setting up RS stage

        m_deviceContext->RSSetState(m_currentRasterizerState);

        // Setting up PS stage

        ID3D11ShaderResourceView* srvs[2] = { };
        srvs[0] = m_diffuseMapViews.at(imesh->material).Get();
        srvs[1] = m_normalMapViews.at(imesh->material).Get();

        m_deviceContext->PSSetShaderResources(0, 2, srvs);

        // Drawing

        m_deviceContext->DrawIndexed(imesh->indices.size(), 0, 0);
    }

    m_swapChain->Present(0, 0);
}

void Renderer::SwitchToWireframe()
{
    m_currentRasterizerState = m_wireframeRasterizerState.Get();
    m_camera.UpdateLastUpdateTickCount();
}

void Renderer::SwitchToSolid()
{
    m_currentRasterizerState = m_solidRasterizerState.Get();
    m_camera.UpdateLastUpdateTickCount();
}

2) Vertex shader

struct VS_INPUT
{
    float3 position : POSITION;
    float3 normal : NORMAL;
    float2 texcoord : TEXCOORD;
};

struct VS_OUTPUT
{
    float4 position : SV_POSITION;
    float3 normal : NORMAL;
    float2 texcoord : TEXCOORD;
};

cbuffer Matrices
{
    matrix worldViewMatrix;
}

VS_OUTPUT main(VS_INPUT input)
{
    VS_OUTPUT output;

    output.position = mul(worldViewMatrix, float4(input.position.xyz, 1.0));
    output.normal = input.normal;
    output.texcoord = input.texcoord;

    return output;
}

3) Pixel shader

Texture2D DiffuseMap : register(t0);
Texture2D NormalMap: register(t1);

SamplerState LinearSampler : register(s0);

float4 main(VS_OUTPUT input) : SV_TARGET
{
    float3 light = normalize(float3(2.87, -0.36, 1.68));

    float3 diffuseColor = DiffuseMap.Sample(LinearSampler, input.texcoord);
    float3 normalDisplace = float3(0.0, 0.0, 1.0) - NormalMap.Sample(LinearSampler, input.texcoord);

    float illumination = clamp(dot(light, input.normal + normalDisplace), 0.2, 1.0);

    return float4(mul(diffuseColor, illumination), 1.0);
}

Answer 1

Okay, I've just figured out the reason of this stairs effect:

The reason is that I passed the same width and height values for CreateWindow WinApi function, and for DXGI_SWAP_CHAIN_DESC::BufferDesc. Meanwhile, these should be different because CreateWindow takes outer width and height of a window to create (window rectangle), while BufferDesc should receive inner values (window client area rectangle). Because of that actual area on screen was smaller than swap chain buffer and the result of rendering was presumably resampled to fit the rectangle, which was introducing the aliasing after MSAA was already applied.

Fixing the issue gave a much cleaner result (4x MSAA is applied here):

But the question with texture aliasing is still open: