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HLSL and Pixel Shaders for XAML
Developers

Walt Ritscher

Beijing • Cambridge • Farnham • Kưln • Sebastopol • Tokyo


HLSL and Pixel Shaders for XAML Developers
by Walt Ritscher
Copyright © 2012 Walt Ritscher. All rights reserved.
Printed in the United States of America.
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Editor: Rachel Roumeliotis
Production Editor: Rachel Steely
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Cover Designer: Karen Montgomery
Interior Designer: David Futato
Illustrators: Robert Romano and Rebecca Demarest

Revision History for the First Edition:
2012-07-03

First release
See for release details.

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ISBN: 978-1-449-31984-7
[LSI]
1341330024


Table of Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
1. Shader 101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Why Should XAML Developers Learn HLSL?
The Tale of the Shader
HLSL and DirectX
Understanding the Graphics Pipeline
XAML and Shaders
Summary

1

2
3
5
7
9

2. Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting Up Your Development Computer
Silverlight Development
WPF Development
Expression Blend 4
Choosing a Shader Compiler
DirectX Compiler
WPF Build Task
Shazzam Shader Editor
Other Tools to Consider
FX Composer
NShader
Visual Studio 2012
A First Shader Project
Using Prebuilt Effects
Adding Effects
Debrief
Custom Shader
Create a Shader Algorithm

11
11
12
12

12
12
13
13
13
13
14
14
15
16
19
22
22
23

iii


Compile the HLSL Code
Add to Visual Studio XAML Project
Create a .NET Wrapper Class
Compile the Project
Instantiate the Shader
Summary

24
24
25
26
27

28

3. Commonplace Pixel Shaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
A Word About Pseudocode
Our Sample Image
Color Modification
Common Techniques
Black, White, and Gray
Color Replacement
Color Enhancement and Correction
Distinctive Effects
Distortion and Displacement
Magnify
Embossed
Testing Distortion Effects
Other Displacement Effects
Blurs
Motion Blur
Zoom Blur
Sharpening
Generative Effects
Multiple Inputs
Sampler Transition
Texture Map
Color Combination
Photoshop Blend Modes
Darken Modes
Lighten Modes
Contrast Modes
Comparative Modes

Other Modes
Blend Modes in HLSL
Practical Uses for Shader Effects
Motion Blur in Moving Parts
Blurs to Emphasize UI Focus
Desaturate for Emphasis
Summary

iv | Table of Contents

30
30
30
31
32
34
34
36
37
38
39
40
42
42
43
43
43
43
44
44

46
47
49
49
51
52
52
52
53
53
54
54
55
55


4. How WPF and Silverlight Use Shaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Framework Effects
BlurEffect
DropShadowEffect
Nested Effects
Multiple Effects on One Element
Expression Blend Effects
Using a Blend Effect
Custom Effects
Creating a Custom ShaderEffect
Working with Samplers
Multi-Input Shaders
Understanding Sampler Size
Creating Parameterized Effects

Padding
Effect Mapping
Summary

57
58
59
59
59
60
61
63
63
65
72
73
75
77
78
83

5. Using Expression Blend and Visual Studio with Shaders . . . . . . . . . . . . . . . . . . . . . . 85
Creating a Project
New Project
Adding Assets
Adding Effects
Setting Effect Properties
Visual Studio Editor
Using Custom Effects in Blend
Multi-Input Effects

Transition Effects in Blend
Create a State Group
Add the States
Set the Properties
Adding a Transition Effect
Summary

85
86
87
88
90
90
92
94
98
98
99
99
100
102

6. Using the Shazzam Shader Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
UI Tour
Create a Custom Shader
Exploring the HLSL Code Editor
Compiling and Testing the Shader
Editor Status Bar
Exploring the Generated Code
Changing Options

Working with HLSL Parameters

103
103
105
106
109
109
110
112
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