SimpleTriangle.cpp

//--------------------------------------------------------------------------------------
// SimpleTriangle.cpp
//
// Advanced Technology Group (ATG)
// Copyright (C) Microsoft Corporation. All rights reserved.
//--------------------------------------------------------------------------------------

#include "pch.h"
#include "SimpleTriangle.h"

#include "ATGColors.h"
#include "ReadData.h"

extern void ExitSample();

using namespace DirectX;

using Microsoft::WRL::ComPtr;

namespace
{
    struct Vertex
    {
        XMFLOAT4 position;
        XMFLOAT4 color;
    };
}

Sample::Sample() :
    m_frame(0)
{
    // Use gamma-correct rendering.
    m_deviceResources = std::make_unique<DX::DeviceResources>(DXGI_FORMAT_B8G8R8A8_UNORM_SRGB, DXGI_FORMAT_D32_FLOAT, 2,
        DX::DeviceResources::c_Enable4K_UHD);
}

// Initialize the Direct3D resources required to run.
void Sample::Initialize(IUnknown* window)
{
    m_gamePad = std::make_unique<GamePad>();

    m_deviceResources->SetWindow(window);

    m_deviceResources->CreateDeviceResources();  
    CreateDeviceDependentResources();

    m_deviceResources->CreateWindowSizeDependentResources();
    CreateWindowSizeDependentResources();
}

#pragma region Frame Update
// Executes basic render loop.
void Sample::Tick()
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Frame %I64u", m_frame);

    m_timer.Tick([&]()
    {
        Update(m_timer);
    });

    Render();

    PIXEndEvent();
    m_frame++;
}

// Updates the world.
void Sample::Update(DX::StepTimer const&)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        if (pad.IsViewPressed())
        {
            ExitSample();
        }
    }

    PIXEndEvent();
}
#pragma endregion

#pragma region Frame Render
// Draws the scene.
void Sample::Render()
{
    // Don't try to render anything before the first Update.
    if (m_timer.GetFrameCount() == 0)
    {
        return;
    }

    // Prepare the render target to render a new frame.
    m_deviceResources->Prepare();
    Clear();

    auto context = m_deviceResources->GetD3DDeviceContext();
    PIXBeginEvent(context, PIX_COLOR_DEFAULT, L"Render");

    // Set input assembler state
    context->IASetInputLayout(m_spInputLayout.Get());

    UINT strides = sizeof(Vertex);
    UINT offsets = 0;
    context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
    context->IASetVertexBuffers(0, 1, m_spVertexBuffer.GetAddressOf(), &strides, &offsets);

    // Set shaders
    context->VSSetShader(m_spVertexShader.Get(), nullptr, 0);
    context->GSSetShader(nullptr, nullptr, 0);
    context->PSSetShader(m_spPixelShader.Get(), nullptr, 0);

    // Draw triangle
    context->Draw(3, 0);

    PIXEndEvent(context);

    // Show the new frame.
    PIXBeginEvent(context, PIX_COLOR_DEFAULT, L"Present");
    m_deviceResources->Present();
    m_graphicsMemory->Commit();
    PIXEndEvent(context);
}

// Helper method to clear the back buffers.
void Sample::Clear()
{
    auto context = m_deviceResources->GetD3DDeviceContext();
    PIXBeginEvent(context, PIX_COLOR_DEFAULT, L"Clear");

    // Clear the views
    auto renderTarget = m_deviceResources->GetRenderTargetView();
    auto depthStencil = m_deviceResources->GetDepthStencilView();

    // Use linear clear color for gamma-correct rendering.
    context->ClearRenderTargetView(renderTarget, ATG::ColorsLinear::Background);

    context->ClearDepthStencilView(depthStencil, D3D11_CLEAR_DEPTH | D3D11_CLEAR_STENCIL, 1.0f, 0);

    context->OMSetRenderTargets(1, &renderTarget, depthStencil);

    // Set the viewport.
    auto viewport = m_deviceResources->GetScreenViewport();
    context->RSSetViewports(1, &viewport);

    PIXEndEvent(context);
}
#pragma endregion

#pragma region Message Handlers
// Message handlers
void Sample::OnSuspending()
{
    auto context = m_deviceResources->GetD3DDeviceContext();
    context->Suspend(0);
}

void Sample::OnResuming()
{
    auto context = m_deviceResources->GetD3DDeviceContext();
    context->Resume();
    m_timer.ResetElapsedTime();
}
#pragma endregion

#pragma region Direct3D Resources
// These are the resources that depend on the device.
void Sample::CreateDeviceDependentResources()
{
    auto device = m_deviceResources->GetD3DDevice();

    m_graphicsMemory = std::make_unique<GraphicsMemory>(device, m_deviceResources->GetBackBufferCount());

    // Load and create shaders
    auto vertexShaderBlob = DX::ReadData(L"VertexShader.cso");

    DX::ThrowIfFailed(
        device->CreateVertexShader(vertexShaderBlob.data(), vertexShaderBlob.size(),
            nullptr, m_spVertexShader.ReleaseAndGetAddressOf()));

    auto pixelShaderBlob = DX::ReadData(L"PixelShader.cso");

    DX::ThrowIfFailed(
        device->CreatePixelShader(pixelShaderBlob.data(), pixelShaderBlob.size(),
            nullptr, m_spPixelShader.ReleaseAndGetAddressOf()));

    // Create input layout
    static const D3D11_INPUT_ELEMENT_DESC s_inputElementDesc[2] =
    {
        { "SV_Position", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 0,  D3D11_INPUT_PER_VERTEX_DATA,  0 },
        { "COLOR",       0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 16, D3D11_INPUT_PER_VERTEX_DATA , 0 },
    };

    DX::ThrowIfFailed(
        device->CreateInputLayout(s_inputElementDesc, _countof(s_inputElementDesc),
            vertexShaderBlob.data(), vertexShaderBlob.size(),
            m_spInputLayout.ReleaseAndGetAddressOf()));

    // Create vertex buffer
    static const Vertex s_vertexData[3] =
    {
        { { 0.0f,   0.5f,  0.5f, 1.0f },{ 1.0f, 0.0f, 0.0f, 1.0f } },  // Top / Red
        { { 0.5f,  -0.5f,  0.5f, 1.0f },{ 0.0f, 1.0f, 0.0f, 1.0f } },  // Right / Green
        { { -0.5f, -0.5f,  0.5f, 1.0f },{ 0.0f, 0.0f, 1.0f, 1.0f } }   // Left / Blue
    };

    D3D11_SUBRESOURCE_DATA initialData = {};
    initialData.pSysMem = s_vertexData;

    D3D11_BUFFER_DESC bufferDesc = {};
    bufferDesc.ByteWidth = sizeof(s_vertexData);
    bufferDesc.Usage = D3D11_USAGE_IMMUTABLE;
    bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
    bufferDesc.StructureByteStride = sizeof(Vertex);

    DX::ThrowIfFailed(
        device->CreateBuffer(&bufferDesc, &initialData,
            m_spVertexBuffer.ReleaseAndGetAddressOf()));
}

// Allocate all memory resources that change on a window SizeChanged event.
void Sample::CreateWindowSizeDependentResources()
{
}
#pragma endregion