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Direct3D Rendering Cookbook

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Direct3D Rendering Cookbook

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Direct3D Rendering Cookbook
Jan, 2014 | 430 pages
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Table of Contents (19 chapters)
Direct3D Rendering Cookbook
Direct3D Rendering Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started with Direct3D
Getting Started with Direct3D
Introduction
Introducing Direct3D 11.1 and 11.2
Building a Direct3D 11 application with C# and SharpDX
Initializing a Direct3D 11.1/11.2 device and swap chain
Debugging your Direct3D application
2
Rendering with Direct3D
Rendering with Direct3D
Introduction
Using the sample rendering framework
Creating device-dependent resources
Creating size-dependent resources
Creating a Direct3D renderer class
Rendering primitives
Applying multisample anti-aliasing
Implementing texture sampling
3
Rendering Meshes
Rendering Meshes
Introduction
Rendering a cube and sphere
Preparing the vertex and constant buffers for materials and lighting
Adding material and lighting
Using a right-handed coordinate system
Loading a static mesh from a file
4
Animating Meshes with Vertex Skinning
Animating Meshes with Vertex Skinning
Introduction
Preparing the vertex shader and buffers for vertex skinning
Loading bones in the mesh renderer
Animating bones
5
Applying Hardware Tessellation
Applying Hardware Tessellation
Introduction
Preparing the vertex shader and buffers for tessellation
Tessellating a triangle and quad
Tessellating bicubic Bezier surfaces
Refining meshes with Phong tessellation
Optimizing tessellation through back-face culling and dynamic Level-of-Detail
6
Adding Surface Detail with Normal and Displacement Mapping
Adding Surface Detail with Normal and Displacement Mapping
Introduction
Referencing multiple textures in a material
Adding surface detail with normal mapping
Adding surface detail with displacement mapping
Implementing displacement decals
Optimizing tessellation based on displacement decal (displacement adaptive tessellation)
7
Performing Image Processing Techniques
Performing Image Processing Techniques
Introduction
Running a compute shader – desaturation (grayscale)
Adjusting the contrast and brightness
Implementing box blur using separable convolution filters
Implementing a Gaussian blur filter
Detecting edges with the Sobel edge-detection filter
Calculating an image's luminance histogram
8
Incorporating Physics and Simulations
Incorporating Physics and Simulations
Introduction
Using a physics engine
Simulating ocean waves
Rendering particles
9
Rendering on Multiple Threads and Deferred Contexts
Rendering on Multiple Threads and Deferred Contexts
Introduction
Benchmarking multithreaded rendering
Implementing multithreaded dynamic cubic environment mapping
Implementing dual paraboloid environment mapping
10
Implementing Deferred Rendering
Implementing Deferred Rendering
Introduction
Filling the G-Buffer
Implementing a screen-aligned quad renderer
Reading the G-Buffer
Adding multiple lights
Incorporating multisample anti-aliasing
11
Integrating Direct3D with XAML and Windows 8.1
Integrating Direct3D with XAML and Windows 8.1
Introduction
Preparing the swap chain for a Windows Store app
Rendering to a CoreWindow
Rendering to an XAML SwapChainPanel
Loading and compiling resources asynchronously
Further Reading
Further Reading
Index
Index

Calculating an image's luminance histogram

In this recipe we will explore using a compute shader to gather characteristics from the source image and output to a buffer. The characteristic that we will be determining is the image's luminance histogram, that is, how many texels are there within the texture for each luminance value (mapped from 0.0-1.0 to 0-255).

We will also cover how to retrieve the data from the GPU and load it into an array that is accessible from the CPU.

How to do it…

We'll begin with the HLSL code necessary to calculate the histogram.

  1. The input continues to be a Texture2D SRV; however, this time our output UAV will be RWByteAddressBuffer.

    Texture2D<float4> input : register(t0);
RWByteAddressBuffer outputByteBuffer : register(u0);
#define THREADSX 32
#define THREADSY 32
// used for RGB/sRGB color models
#define LUMINANCE_RGB float3(0.2125, 0.7154, 0.0721)
#define LUMINANCE(_V) dot(_V.rgb, LUMINANCE_RGB)

  2. Our actual compute shader is quite simple:

    // Calculate the luminance...
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