OpenGL ES with iOS 5 Part 2: Rendering a masterpiece – Swipe Conference 2012

At September's Swipe Conference I gave two talks on OpenGL with iOS. The first talk, "OpenGL ES with iOS 5 Part 1: Learning to draw" was an introduction to OpenGL ES and GLKit. The second talk covered rendering effects in OpenGL using GLKit, looking at the OpenGL debugging and profiling tools that ship with Xcode, and demonstrating how OpenGL can be used for some fancy segue transitions.

In more detail, my talk "OpenGL ES with iOS 5 Part 2: Rendering a masterpiece" covered:

• Rendering textured triangles using GLKTextureLoader and GLKBaseEffect;
• Creating cubemaps using GLKTextureLoader;
• Rendering skyboxes using GLKSkyboxEffect;
• Rendering reflection map effects using GLKReflectionMapEffect;
• Demonstration of the Xcode OpenGL ES frame debugger;
• Demonstration of the OpenGL ES Driver and Analyzer instruments;
• Demonstration of the OpenGL ES Performance Detective;
• Performance recommendations specific to OpenGL ES on iOS devices;
• Demonstration of some fancy custom storyboard segue transitions using OpenGL ES

The slides from the talk are available at https://speakerdeck.com/chrismiles/opengl-es-with-ios-5-part-2-rendering-a-masterpiece or http://chrismiles.info/presentations/SwipeConf-2012-OpenGL-ES-iOS5/Swipe-2012-OpenGL-ES-iOS5-Part2.pdf [PDF]

The demo apps used in the talk are all released open source.

SwipeOpenGLTriangles demonstrates rendering textured triangles  – https://github.com/chrismiles/SwipeOpenGLTriangles

Swipe3D demonstrates GLKSkyboxEffect, GLKReflectionMapEffect, cubemap textures and indexed vertices – https://github.com/chrismiles/Swipe3D

FancySegue shows how to build custom segue transitions using OpenGL – https://github.com/chrismiles/FancySegue

All the sample apps are universal and support all orientations.

Also see my post about the first talk: OpenGL ES with iOS 5 Part 1: Learning to draw – Swipe Conference 2012.

Update: the presentation video is now available online at https://www.youtube.com/watch?v=dkqBjsEpt5g

OpenGL ES with iOS 5 Part 1: Learning to draw – Swipe Conference 2012

In September I presented two talks at Swipe Conference in Sydney. The first talk, "OpenGL ES with iOS 5 Part 1: Learning to draw", was an introduction to OpenGL ES and GLKit, aimed at iOS developers new to OpenGL programming.

In the talk I used a simple demo app, SwipeOpenGLTriangles, to demonstrate OpenGL ES rendering concepts with GLKit, such as:

• Setting up an OpenGL ES scene using GLKViewController + GLKView
• Rendering triangles (GL_TRIANGLES) and meshes made of triangles
• Applying vertex colours, using GLKBaseEffect
• Applying lighting, using GLKBaseEffect
• Applying texturing, using GLKBaseEffect and GLKTextureLoader
• Using Vertex Array Objects (VAO) and Vertex Buffer Objects (VBO)
• Using interleaved vertex arrays (IVA)
• Animating vertex positions (tap screen to animate between flat triangles and 3D open box shape)
• The sample app is universal and supports all orientations.

The full source to the demo app is released open source (MIT licensed) at https://github.com/chrismiles/SwipeOpenGLTriangles


The slides from the talk are available at https://speakerdeck.com/chrismiles/opengl-es-with-ios-5-part-1-learning-to-draw or http://chrismiles.info/presentations/SwipeConf-2012-OpenGL-ES-iOS5/Swipe-2012-OpenGL-ES-iOS5-Part1.pdf [PDF].

Update: The presentation video is now online at https://www.youtube.com/watch?v=s6VCaFQFBtM