iDevBlogADay ← Indie Ambitions

Tips for Mobile Devs – Image Magick Command Line 1

Jan

31

2013

When I first began contracting I stumbled on to a tool that I now use all the time, Image Magick. Image Magick is a C library that can be used in all kinds of ways, including inside your iOS app if you want. But, I use it as a command line tool to manipulate image ...

Mixing two Videos with GPUImage 11

Oct

3

2012

There was some discussion on the GPUImage github a little while back about how to mix two video input sources. I have been meaning to investigate this capability for a while. Well, last night I had a burst of productive energy so I was up late playing with it. This morning I can report my ...

Perform a blur using vImage from the Accelerate framework Tutorial 10

Sep

17

2012

Last week I attended 360iDev for the first time. It was tres awesome. One of my favorite sessions was on the accelerate framework from Jeff Biggus (@hyperjeff). One of the biggest barriers to using the framework is a lack of easy to follow documentation/sample code. I went looking for some sample code on how to ...

Perlin Noise on GPU in GPUImage 1

May

16

2012

Perlin noise has all kinds of applications, from realistic looking texutres to fire effects to flow fields. It’s a useful tool to have in the belt. If you’ve never heard of perlin noise here’s the wikipedia article and here’s a great explanation of how it’s calculated. Better than that, here are some examples of its ...

Learning OpenGL with GPUImage 11

May

2

2012

Writing an Image Processing Filter In this post we’re going to cover the basics of how to write an image processing filter using glsl. We’ll be producing a variant of an existing filter. Here’s a look at our final project: We’ll be using the GPUImage framework in order to jump in to writing glsl shaders ...

More Fun With Cocos2d Particles 1

Feb

20

2012

My latest attempt is to extend the Cocos2d particle system to include a variety of things, multiple particle sprites, animated sprites, flow fields, and eventually a boids algorithm implementation. Today I have a work in progress class that’s by no means ready for any kind of production. I though I’d share it anyway. In it’s ...

My Quest to Learn OpenGL 3

Feb

7

2012

This post is going to be all about openGL. I don’t explain it from a beginner’s perspective, so if you are new the the openGL API, it may not be easy to follow. I have listed what I think are the best resources in the bottom paragraph. If you’re new, definitely read those, especially Jeff ...

Cocos2D Particle Engine w/Different Sprites 6

Dec

13

2011

Most of my development work is centered around educational games. I am co-founder of Third Rail Games, LLC. A while back I wanted to modify the particle system in Cocos2D so that it would put out streams of letters in a given sequence instead of the one sprite. Here’s what I ended up with: Here’s ...

Easiest Twitter App Ever (plus NSLinguisticTagger)

Nov

15

2011

My very first idea for an iphone app was something that would allow me to navigate the language used in tweets. I wanted to create an app that pulled twitter data, based on a search phrase, parse the words in that request, pull out represent those words by frequency or importance, and present that visually ...

Conway’s Game of Life Painted with Incoming Video (Core Image Tut) 6

Oct

31

2011

Combining Core Image and Core Graphics A few months ago I heard about this great app called Composite. This app lets you draw to the canvas using the video feed input as paint. It’s really quite cool and when I started learning about what Core Image could do I started to wonder if similar thing ...