Book Image

OpenGL Development Cookbook

By : Muhammad Mobeen Movania
Book Image

OpenGL Development Cookbook

By: Muhammad Mobeen Movania

Overview of this book

OpenGL is the leading cross-language, multi-platform API used by masses of modern games and applications in a vast array of different sectors. Developing graphics with OpenGL lets you harness the increasing power of GPUs and really take your visuals to the next level. OpenGL Development Cookbook is your guide to graphical programming techniques to implement 3D mesh formats and skeletal animation to learn and understand OpenGL. OpenGL Development Cookbook introduces you to the modern OpenGL. Beginning with vertex-based deformations, common mesh formats, and skeletal animation with GPU skinning, and going on to demonstrate different shader stages in the graphics pipeline. OpenGL Development Cookbook focuses on providing you with practical examples on complex topics, such as variance shadow mapping, GPU-based paths, and ray tracing. By the end you will be familiar with the latest advanced GPU-based volume rendering techniques.

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OpenGL Development Cookbook
Muhammad Mobeen Movania
Jun, 2013 | 326 pages
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Table of Contents (15 chapters)
OpenGL Development Cookbook
OpenGL Development 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
Introduction to Modern OpenGL
Introduction to Modern OpenGL
Introduction
Setting up the OpenGL v3.3 core profile on Visual Studio 2010 using the GLEW and freeglut libraries
Designing a GLSL shader class
Rendering a simple colored triangle using shaders
Doing a ripple mesh deformer using the vertex shader
Dynamically subdividing a plane using the geometry shader
Dynamically subdividing a plane using the geometry shader with instanced rendering
Drawing a 2D image in a window using the fragment shader and the SOIL image loading library
2
3D Viewing and Object Picking
3D Viewing and Object Picking
Introduction
Implementing a vector-based camera with FPS style input support
Implementing the free camera
Implementing the target camera
Implementing view frustum culling
Implementing object picking using the depth buffer
Implementing object picking using color
Implementing object picking using scene intersection queries
3
Offscreen Rendering and Environment Mapping
Offscreen Rendering and Environment Mapping
Introduction
Implementing the twirl filter using the fragment shader
Rendering a skybox using static cube mapping
Implementing a mirror with render-to-texture using FBO
Rendering a reflective object using dynamic cube mapping
Implementing area filtering (sharpening/blurring/embossing) on an image using convolution
Implementing the glow effect
4
Lights and Shadows
Lights and Shadows
Introduction
Implementing per-vertex and per-fragment point lighting
Implementing per-fragment directional light
Implementing per-fragment point light with attenuation
Implementing per-fragment spot light
Implementing shadow mapping with FBO
Implemeting shadow mapping with percentage closer filtering (PCF)
Implementing variance shadow mapping
5
Mesh Model Formats and Particle Systems
Mesh Model Formats and Particle Systems
Introduction
Implementing terrains using the height map
Implementing 3ds model loading using separate buffers
Implementing OBJ model loading using interleaved buffers
Implementing EZMesh model loading
Implementing simple particle system
6
GPU-based Alpha Blending and Global Illumination
GPU-based Alpha Blending and Global Illumination
Introduction
Implementing order-independent transparency using front-to-back peeling
Implementing order-independent transparency using dual depth peeling
Implementing screen space ambient occlusion (SSAO)
Implementing global illumination using spherical harmonics lighting
Implementing GPU-based ray tracing
Implementing GPU-based path tracing
7
GPU-based Volume Rendering Techniques
GPU-based Volume Rendering Techniques
Introduction
Implementing volume rendering using 3D texture slicing
Implementing volume rendering using single-pass GPU ray casting
Implementing pseudo-isosurface rendering in single-pass GPU ray casting
Implementing volume rendering using splatting
Implementing transfer function for volume classification
Implementing polygonal isosurface extraction using the Marching Tetrahedra algorithm
Implementing volumetric lighting using the half-angle slicing
8
Skeletal and Physically-based Simulation on the GPU
Skeletal and Physically-based Simulation on the GPU
Introduction
Implementing skeletal animation using matrix palette skinning
Implementing skeletal animation using dual quaternion skinning
Modeling cloth using transform feedback
Implementing collision detection and response on a transform feedback-based cloth model
Implementing a particle system using transform feedback
Index
Index

Implemeting shadow mapping with percentage closer filtering (PCF)

The shadow mapping algorithm, though simple to implement, suffers from aliasing artefacts, which are due to the shadowmap resolution. In addition, the shadows produced using this approach are hard. These can be minimized either by increasing the shadowmap resolution or taking more samples. The latter approach is called percentage closer filtering (PCF), where more samples are taken for the shadowmap lookup and the percentage of the samples is used to estimate if a fragment is in shadow. Thus, in PCF, instead of a single lookup, we sample an n×n neighborhood of shadowmap and then average the values.

Getting started

The code for this recipe is contained in the Chapter4/ShadowMappingPCF directory. It builds on top of the previous recipe, Implementing shadow mapping with FBO. We use the same scene but augment it with PCF.

How to do it…

Let us see how to extend the basic shadow mapping with PCF.

  1. Change the shadowmap texture minification...

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