book

OpenGL Game Development By Example

Name: OpenGL Game Development By Example
ISBN: 9781783288199

by Stephen Madsen, Robert Madsen

March 2016

Beginner to intermediate

340 pages

6h 51m

English

Packt Publishing

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OpenGL Game Development By Example
Table of Contents
OpenGL Game Development By Example
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Support files, eBooks, discount offers, and moreWhy subscribe?Free access for Packt account holders
Preface
What this book covers
What you need for this book
Who this book is for

Conventions
Reader feedback
Customer support
Downloading the example codeErrataPiracyQuestions
1. Building the Foundation
Introducing the development environmentA quick look at Visual StudioStart screenThe Solution Explorer panelThe Standard Toolbar panelThe code windowThe output windowStarting your project
The game loop
The game structureInitializationThe game loopShutdownCreating the game structurePort of accessThe Windows message loop
Introducing OpenGL
What is OpenGL?The other GLDownloading OpenGLAdding OpenGL to the projectLinking to the OpenGL library
Summary
2. Your Point of View
Plotting your revengeThe OpenGL coordinate systemMaking your pointUnderstanding the codeHeader filesInitializing OpenGLThe main entry pointThe update functionDrawing the pointsRunning the programStretching your pointGetting primitiveA triangle by any other nameA primitive exampleFrom triangles to models
Introducing textures
Using textures to fill the trianglesA matter of referenceHanging out in the quadCoding the quadRendering a textureLoading the textureTexture wrappingCreating a textured quad
Putting the pieces together
Summary
3. A Matter of Character
Spritely speakingSprites versus non-spritesFlipbook animationFramed animation
Creating sprites
Working with PNGsLinking to the SOIL libraryIncluding the SOIL header fileOpening an image fileCoding a sprite classCreating sprite framesSaving each frameLoading a sprite from individual texturesCreating a sprite sheetLoading a sprite sheetLoading our sprites
Rendering
Adding a render to the game loopImplementing the main Render functionImplementing Render in the Sprite classUV mappingOne more detail
A moving example
Adding update to the game loopImplementing the main Update callImplementing Update in the Sprite classCharacter movementUsing delta timeCalculating delta timeFlippingScrolling the background
Using an atlas
Summary
4. Control Freak
A penny for your inputThe keyboard inputUsing the mouseTouchOther inputs
Someone is listening
The WndProc event listenerHandling the message queueHandling mouse and keyboard inputsCreating the Input classVirtual key codesQuerying for inputImplementing the Input classAdding input to the game loopProcessing our inputChanges to the Sprite class
Graphical User Interface
Creating a buttonEnhancing the Input classAdding UI elements to the listChecking each UI elementPushing your buttonsAdding our pauseButton
State management
Creating a state managerPausing the game
Summary
5. Hit and Run
Out of bounds!Getting anchoredCollision rectanglesEmbeddingFixing the background
Collideables
Ready to scoreA friend indeedTime to spawn
Circular collision detection
The Pythagorean TheoremAdding the circular collision codeWhy use circular collision detection?Wiring in the collision detection
Rectangular collision detection
The enemy withinSpawning the enemyAdding the rectangular collision codeWiring continued
Summary
6. Polishing the Silver
The state of the gameState machinesWhy do we need a state machine?Planning for stateDefining the new stateImplementing the state machine
Making a splash
Creating the splash screenDefining the splash screenLoading our resources
What's on the menu?
Creating the menuDefining the menu buttons
Getting some credit
Creating the credits screenGetting back to the main menu
Working with fonts
Creating the fontDrawing textWiring in the font support
Level up!
Displaying the scoreGame progressionDefining game levelsGame statsThe next level screenContinuing the game
Game over
The game over screenReplaying the game
Summary
7. Audio Adrenaline
Bits and bytesA sound by any other nameMaking noise
Revving up your engine
Accessing the FMOD .dll fileLinking to the libraryPoint to the include files
Initializing FMOD
Virtual channelsChannel priority
Bleeps and bloops
Sound effectsSetting up the soundsPlaying soundsUI feedback
The sound of music
Cleaning up the house
Release spritesRelease inputReleasing fontsReleasing audio
Summary
8. Expanding Your Horizons
Into the third dimension!Simulating 3DReal 3D3D Coordinate Systems
The camera
Remember those home movies?Steady as she goes!The viewport
Entering the matrix
VectorsCombining vectorsIdentity matrix
Coding in 3D
Creating the projectRetrieving OpenGL filesLinking projects to OpenGL libraries
Setting up the OpenGL window
Including header filesDefining global variablesCreating a function to create the OpenGL windowSizing the OpenGL windowInitializing the OpenGL windowCreating a function to remove the OpenGL windowCreating the OpenGL windowCreating the Windows event handlerThe Game loopThe finale
Summary
9. Super Models
New Space
A computer in a computer
Drawing your weapons
Getting primitiveDrawing primitivesMaking your pointGl_PointsGetting in lineGl_LinesGl_Line_StripGl_Line_LoopTriangulationGl_TrianglesGl_Triangle_StripGl_Triangle_FanBeing squareGl_QuadsGl_Quad_StripSaving faceBack to Egypt
A modeling career
Blending inBlender overviewBuilding your spaceshipExporting the objectGetting loaded
Summary
10. Expanding Space
Creation 101Preparing the projectLoading game objectsThe Model class headerImplementing the Model classModifying the game code
Taking control
Implementing input
Asteroid slalom
Setting up collision detectionTurning on collision
Summary
11. Heads Up
Mixing things upThe saving statePush and popTwo state rendering
A matter of state
Adding the state machineGetting ready for a splash
Creating the user interface
Defining the text systemDefining texturesWiring in render, update, and the game loop
Summary
12. Conquer the Universe
A fun frameworkSetting up the Visual Studio projectSetting up the Windows environmentSetting up the OpenGL environmentSetting up the game loop
Texture mapping
Loading the textureRendering the cubeMapping operations
Let there be light!
Defining a light source
The skybox
Advanced topics
Game physicsAI
The future
Summary
Index

Content preview from OpenGL Game Development By Example

Using an atlas

As I have mentioned already, texture memory is one of your core resources. In fact, it is common to run out of memory because of all the textures required to animate a typical 2D game. It is also time-consuming to load individual textures rather than loading on a larger texture. So, we have to come up with methods to use texture memory more efficiently.

One common technique designed to pack more textures into less space is known as atlasing. A texture atlas works much like a sprite sheet described earlier in this chapter. Instead of storing each texture as its own image, we pack all of the textures for the entire game into one or more textures known as atlases.

As the word suggests, an atlas works much like a map. We simply need to ...

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OpenGL Game Development By Example

by Stephen Madsen, Robert Madsen

Using an atlas

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