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Home > Game Development > Graphics Programming > OpenGL 4 Shading Language Cookbook
OpenGL 4 Shading Language Cookbook
OpenGL 4 Shading Language Cookbook

OpenGL 4 Shading Language Cookbook: Build high-quality, real-time 3D graphics with OpenGL 4.6, GLSL 4.6 and C++17 , Third Edition

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OpenGL 4 Shading Language Cookbook

Working with GLSL Programs

In this chapter, we will cover the following recipes:

  • Sending data to a shader using vertex attributes and vertex buffer objects
  • Getting a list of active vertex input attributes and locations
  • Sending data to a shader using uniform variables
  • Getting a list of active uniform variables
  • Using uniform blocks and uniform buffer objects
  • Using program pipelines
  • Getting debug messages
  • Building a C++ shader program class

Introduction

In Chapter 1, Getting Started with GLSL, we covered the basics of compiling, linking, and exporting shader programs. In this chapter, we'll cover techniques for communication between shader programs and the host OpenGL program. To be more specific, we'll focus primarily on input. The input to shader programs is generally accomplished via attributes and uniform variables. In this chapter, we'll see several examples of the use of these types of variables. We'll also cover a recipe for mixing and matching shader program stages, and a recipe for creating a C++ shader program object.

We won't cover shader output in this chapter. Obviously, shader programs send their output to the default framebuffer, but there are several other techniques for receiving shader output. For example, the use of custom framebuffer objects allow us to store shader...

Sending data to a shader using vertex attributes and vertex buffer objects

The vertex shader is invoked once per vertex. Its main job is to process the data associated with the vertex, and pass it (and possibly other information) along to the next stage of the pipeline. In order to give our vertex shader something to work with, we must have some way of providing (per-vertex) input to the shader. Typically, this includes the vertex position, normal vector, and texture coordinates (among other things). In earlier versions of OpenGL (prior to 3.0), each piece of vertex information had a specific channel in the pipeline. It was provided to the shaders using functions such as glVertex, glTexCoord, and glNormal (or within client vertex arrays using glVertexPointer, glTexCoordPointer, or glNormalPointer). The shader would then access these values via...

Getting a list of active vertex input attributes and locations

As covered in the previous recipe, the input variables within a vertex shader are linked to generic vertex attribute indices at the time the program is linked. If we need to specify the relationship, we can either use layout qualifiers within the shader, or we could call glBindAttribLocation before linking.

However, it may be preferable to let the linker create the mappings automatically and query for them after program linking is complete. In this recipe, we'll see a simple example that prints all the active attributes and their indices.

Getting ready

Start with an OpenGL program that compiles and links a shader pair. You could use the shaders...

Sending data to a shader using uniform variables

Vertex attributes offer one avenue for providing input to shaders; a second technique is uniform variables. Uniform variables are intended to be used for data that may change relatively infrequently compared to per-vertex attributes. In fact, it is simply not possible to set per-vertex attributes with uniform variables. For example, uniform variables are well-suited to the matrices used for modeling, viewing, and projective transformations.

Within a shader, uniform variables are read-only. Their values can only be changed from outside the shader, via the OpenGL API. However, they can be initialized within the shader by assigning them to a constant value along with the declaration.

Uniform variables can appear in any shader within a shader program, and are always used as input variables. They can be declared in one or more shaders...

Getting a list of active uniform variables

While it is a simple process to query for the location of an individual uniform variable, there may be instances where it can be useful to generate a list of all active uniform variables. For example, one might choose to create a set of variables to store the location of each uniform and assign their values after the program is linked. This would avoid the need to query for uniform locations when setting the value of the uniform variables, creating slightly more efficient code.

The process for listing uniform variables is very similar to the process for listing attributes (see the Getting a list of active vertex input attributes and locations recipe), so this recipe will refer the reader back to the previous recipe for a detailed explanation.

...

Using uniform blocks and uniform buffer objects

If your program involves multiple shader programs that use the same uniform variables, one has to manage the variables separately for each program. Uniform locations are generated when a program is linked, so the locations of the uniforms may change from one program to the next. The data for those uniforms may have to be regenerated and applied to the new locations.

Uniform blocks were designed to ease the sharing of uniform data between programs. With uniform blocks, one can create a buffer object for storing the values of all the uniform variables, and bind the buffer to the uniform block. When changing programs, the same buffer object need only be rebound to the corresponding block in the new program.

A uniform block is simply a group of uniform variables defined within a syntactical structure known as a uniform block. For example...

Using program pipelines

Program pipeline objects were introduced as part of the separable shader objects extension, and moved into core OpenGL with version 4.1. They allow programmers to mix and match shader stages from multiple separable shader programs. To understand how this works and why it may be useful, let's go through a hypothetical example. 

Suppose we have one vertex shader and two fragment shaders. Suppose that the code in the vertex shader will function correctly with both fragment shaders. I could simply create two different shader programs, reusing the OpenGL shader object containing the vertex shader. However, if the vertex shader has a lot of uniform variables, then every time that I switch between the two shader programs, I would (potentially) need to reset some or all of those uniform variables. This is because the uniform variables...

Introduction

In Chapter 1, Getting Started with GLSL, we covered the basics of compiling, linking, and exporting shader programs. In this chapter, we'll cover techniques for communication between shader programs and the host OpenGL program. To be more specific, we'll focus primarily on input. The input to shader programs is generally accomplished via attributes and uniform variables. In this chapter, we'll see several examples of the use of these types of variables. We'll also cover a recipe for mixing and matching shader program stages, and a recipe for creating a C++ shader program object.

We won't cover shader output in this chapter. Obviously, shader programs send their output to the default framebuffer, but there are several other techniques for receiving shader output. For example, the use of custom framebuffer objects allow us to store shader output to a texture or other buffer. A technique called transform feedback allows for the storage of vertex shader output into arbitrary buffers...

Sending data to a shader using vertex attributes and vertex buffer objects

The vertex shader is invoked once per vertex. Its main job is to process the data associated with the vertex, and pass it (and possibly other information) along to the next stage of the pipeline. In order to give our vertex shader something to work with, we must have some way of providing (per-vertex) input to the shader. Typically, this includes the vertex position, normal vector, and texture coordinates (among other things). In earlier versions of OpenGL (prior to 3.0), each piece of vertex information had a specific channel in the pipeline. It was provided to the shaders using functions such as glVertex, glTexCoord, and glNormal (or within client vertex arrays using glVertexPointer, glTexCoordPointer, or glNormalPointer). The shader would then access these values via built-in variables such as gl_Vertex and gl_Normal. This functionality was deprecated in OpenGL 3.0 and later removed. Instead, vertex information...

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Description

OpenGL 4 Shading Language Cookbook, Third Edition provides easy-to-follow recipes that first walk you through the theory and background behind each technique, and then proceed to showcase and explain the GLSL and OpenGL code needed to implement them. The book begins by familiarizing you with beginner-level topics such as compiling and linking shader programs, saving and loading shader binaries (including SPIR-V), and using an OpenGL function loader library. We then proceed to cover basic lighting and shading effects. After that, you'll learn to use textures, produce shadows, and use geometry and tessellation shaders. Topics such as particle systems, screen-space ambient occlusion, deferred rendering, depth-based tessellation, and physically based rendering will help you tackle advanced topics. OpenGL 4 Shading Language Cookbook, Third Edition also covers advanced topics such as shadow techniques (including the two of the most common techniques: shadow maps and shadow volumes). You will learn how to use noise in shaders and how to use compute shaders. The book provides examples of modern shading techniques that can be used as a starting point for programmers to expand upon to produce modern, interactive, 3D computer-graphics applications.

Who is this book for?

If you are a graphics programmer looking to learn the GLSL shading language, this book is for you. A basic understanding of 3D graphics and programming experience with C++ are required.

What you will learn

  • Compile, debug, and communicate with shader programs
  • Use compute shaders for physics, animation, and general computing
  • Learn about features such as shader storage buffer objects and image load/store
  • Utilize noise in shaders and learn how to use shaders in animations
  • Use textures for various effects including cube maps for reflection or refraction
  • Understand physically based reflection models and the SPIR-V Shader binary
  • Learn how to create shadows using shadow maps or shadow volumes
  • Create particle systems that simulate smoke, fire, and other effects
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Publication date : Sep 28, 2018
Length: 472 pages
Edition : 3rd
Language : English
ISBN-13 : 9781789342253
Category :
Game Development
Languages :
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Concepts :
Graphics Programming
Tools :
GLSL

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Publication date : Sep 28, 2018
Length: 472 pages
Edition : 3rd
Language : English
ISBN-13 : 9781789342253
Category :
Game Development
Languages :
C++
Concepts :
Graphics Programming
Tools :
GLSL

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Table of Contents

12 Chapters
Getting Started with GLSL Chevron down icon Chevron up icon
Getting Started with GLSL
Introduction
Using a loading library to access the latest OpenGL functionality
Using GLM for mathematics
Determining the GLSL and OpenGL version
Compiling a shader
Linking a shader program
Saving and loading a shader binary
Loading a SPIR-V shader program
Working with GLSL Programs Chevron down icon Chevron up icon
Working with GLSL Programs
Introduction
Sending data to a shader using vertex attributes and vertex buffer objects
Getting a list of active vertex input attributes and locations
Sending data to a shader using uniform variables
Getting a list of active uniform variables
Using uniform blocks and uniform buffer objects
Using program pipelines
Getting debug messages
Building a C++ shader program class
The Basics of GLSL Shaders Chevron down icon Chevron up icon
The Basics of GLSL Shaders
Introduction
Diffuse and per-vertex shading with a single point light source
Implementing the Phong reflection model
Using functions in shaders
Implementing two-sided shading
Implementing flat shading
Using subroutines to select shader functionality
Discarding fragments to create a perforated look
Lighting and Shading Chevron down icon Chevron up icon
Lighting and Shading
Introduction
Shading with multiple positional lights
Shading with a directional light source
Using per-fragment shading for improved realism
The Blinn-Phong reflection model
Simulating a spotlight
Creating a cartoon shading effect
Simulating fog
A physically-based reflection model
Using Textures Chevron down icon Chevron up icon
Using Textures
Introduction
Applying a 2D texture
Applying multiple textures
Using alpha maps to discard pixels
Using normal maps
Parallax mapping
Steep parallax mapping with self shadowing
Simulating reflection with cube maps
Simulating refraction with cube maps
Applying a projected texture
Rendering to a texture
Using sampler objects
Diffuse image-based lighting
Image Processing and Screen Space Techniques Chevron down icon Chevron up icon
Image Processing and Screen Space Techniques
Introduction
Applying an edge detection filter
Applying a Gaussian blur filter
Implementing HDR lighting with tone mapping
Creating a bloom effect
Using gamma correction to improve image quality
Using multisample anti-aliasing
Using deferred shading
Screen space ambient occlusion
Configuring the depth test
Implementing order-independent transparency
Using Geometry and Tessellation Shaders Chevron down icon Chevron up icon
Using Geometry and Tessellation Shaders
Introduction
Point sprites with the geometry shader
Drawing a wireframe on top of a shaded mesh
Drawing silhouette lines using the geometry shader
Tessellating a curve
Tessellating a 2D quad
Tessellating a 3D surface
Tessellating based on depth
Shadows Chevron down icon Chevron up icon
Shadows
Introduction
Rendering shadows with shadow maps
Anti-aliasing shadow edges with PCF
Creating soft shadow edges with random sampling
Creating shadows using shadow volumes and the geometry shader
Using Noise in Shaders Chevron down icon Chevron up icon
Using Noise in Shaders
Introduction
Creating a noise texture using GLM
Creating a seamless noise texture
Creating a cloud-like effect
Creating a wood-grain effect
Creating a disintegration effect
Creating a paint-spatter effect
Creating a rusted metal effect
Creating a night-vision effect
Particle Systems and Animation Chevron down icon Chevron up icon
Particle Systems and Animation
Introduction
Animating a surface with vertex displacement
Creating a particle fountain
Creating a particle system using transform feedback
Creating a particle system using instanced meshes
Simulating fire with particles
Simulating smoke with particles
Using Compute Shaders Chevron down icon Chevron up icon
Using Compute Shaders
Introduction
Implementing a particle simulation with the compute shader
Creating a fractal texture using the compute shader
Using the compute shader for cloth simulation
Implementing an edge detection filter with the compute shader
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Jacqui Jan 02, 2021
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It helped a desperate student
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Mahmoud Zeidan Jan 04, 2020
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We nice book for a lot of advanced topics.
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n.hiroshige Sep 26, 2021
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(追記)2023/01/06githubからダウンロードしたファイルに含まれるREADMEにはmakeの手順が書いてありますが、その通りに実施してもうまくいかなかったので、以下のようにしました。[主な相違点](1)glfwはコンパイル済みのライブラリをダウンロードしました（glfw-3.3.8.bin.WIN64）(2)Visual Studio 2022で、「空のプロジェクト」を作成し、必要なファイルを追加しました。 コンパイルエラー、リンクエラーが多数出ましたが、ヘッダファイルとライブラリのインクルード設定を適切に行い、まめにエラーを取ることで、Windows環境でサンプルプログラムを実行することができました。------------------------GLSLによるライティングや影などのグラフィカルな効果を実現するための「レシピ」が70件ほど記載されています。それぞれの「レシピ」は、理論、コード、コードの解説から構成されています。GLSLにデータを供給する側のOpenGLのコードとともにgithubにUPされているので、動作を確認しながら学習を進めることができます。実用的なテクニックを学ぶのに最適な本だと思います。・入門書ではないので、データ型とか、コメントの書き方などの文法事項の説明はありません。・「レシピ」は、前のレシピのコードを利用したりしていることがあるので、最初から順番に読んだ方が理解し易いと思います。・本文には、OpenGLのコードはあまり記載されていないので、本文とgithubからダウンロードしたコードの両方を見ながら学習しないと理解が難しいと思います。
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pedro torres jim Apr 18, 2021
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GREAT CONTENT BUT BEFORE BUYING KEEP IN MIND THAT PACKPUB ONLY PRINT GRAYSCALE SO CAN'T EXPECT COLOR IMAGES. AS THIS IS A GRAPHICAL BOOK AND WANT TO PRACTICE PROGRAMMING SOME GOOD RECIPES ON SHADERS THE IMAGE IS TOO DIFFICULT TO RECOGNIZE SO JUST DOWNLOAD THE APPENDIX
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Client d'Amazon May 29, 2019
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Très bon contenu pour ce livre, si vous voulez écrire des shaders GLSL performants et réalistes. Le livre est très complet. Toutefois, j'enlève une étoile pour la version Kindle, dont la mise en page laisse un peu à désirer.
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Wolff
David Wolff is a professor in the computer science department at Pacific Lutheran University (PLU). He received a PhD in Physics and an MS in computer science from Oregon State University. He has been teaching computer graphics to undergraduates at PLU for over 17 years, using OpenGL.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela