Real-time 3d Rendering With Directx And Hlsl

[Ena Marklund]

Iam reading a book on directx and wish to run the books sample applications. The instructions to do this are found here: -time-3d-rendering-with-directx-and-hlsl/src/master/I am unsure as to what to do for the 'Library Dependencies' sections. Any help?

Per the notes, these projects use vcpkg now for the dependencies, specifically the ports for directxtk, ms-gsl, assimp, and imgui. The NuGet package manager is still used for the C++/WinRT headers--I've got a personal project to create a vcpkg port for that as well.

The Quick Start (latest) instructions tell you how to clone and install each of these vcpkg packages. This will build those libraries and place them in a central location for the samples to consume them. The vcpkg integrate install instruction makes them available to Visual Studio.

To begin, launch NVIDIA FX Composer and create a new project. Open the Assets panel, right-click on the Materials icon, and choose Add Material from New Effect. Then choose HLSL FX from the Add Effect dialog box (see Figure 4.1).

Direct3D pipeline stages can be programmed through separately compiled shaders. For instance, you can house a vertex shader in one file (commonly with the extension .hlsl) and a pixel shader in a different file. Under this configuration, each file must contain exactly one shader. By contrast, HLSL Effect files enable you to combine multiple shaders, support functions, and render states into a single file. This is the file format we use throughout this text, and Listing 4.1 uses it.

Note the text WORLDVIEWPROJECTION following the colon in the variable declaration. This is known as a semantic and is a hint to the CPU-side application about the intended use of the variable. Semantics relieve the application developer from a priori knowledge of the names of shader constants. In this example, you could have named your float44 variable WVP or WorldViewProj without any impact to the CPU side because it can access the variable through the WORLDVIEWPROJECTION semantic instead of through its name. A variety of common semantics exist, all of which are optional for shader constants. However, in the context of NVIDIA FX Composer, the WORLDVIEWPROJECTION semantic is not optional; it must be associated with a shader constant for your effect to receive updates to the concatenated WVP matrix each frame.

In contrast, a cbuffer named CBufferPerFrame implies that the data within the buffer can be updated just once per frame, allowing multiple objects to be rendered with the same shared shader constants.

The culling issue is present within NVIDIA FX Composer because it supports both DirectX and OpenGL rendering APIs. These libraries disagree on the default winding order for front-facing triangles, and NVIDIA FX Composer opted for the OpenGL default.

This code resembles a C-style function, but with some key differences. First, note the work the vertex shader is accomplishing. Each vertex comes into the shader in object space, and the WorldViewProjection matrix transforms it into homogeneous clip space. In general, this is the least amount of work a vertex shader performs.

Semantics with the prefix SV_ are system-value semantics and were introduced in Direct3D 10. These semantics designate a specific meaning to the pipeline. For example, SV_Position indicates that the associated output will contain a transformed vertex position for use in the rasterizer stage.

Also notice the arguments vs_4_0 and ps_4_0 within the SetVertexShader and SetPixelShader statements. These values identify the shader profiles to use when compiling the shaders specified in the second arguments of the CompileShader calls. Shader profiles are analogous to shader models, which define the capabilities of the graphics system that are required to support the corresponding shaders. As of this writing, there have been five major (and several minor) shader model revisions; the latest is shader model 5. Each shader model has extended the functionality of the previous revision in a variety of ways. Generally, however, the potential sophistication of shaders has increased with each new shader model. Direct3D 10 introduced shader model 4, which we use for all Direct3D 10 techniques. Shader model 5 was introduced with Direct3D 11, and we use that shader model for all Direct3D 11 techniques.

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