Lastly, I’ll be using the latest version of Xcode in this tutorial, so make sure you’re fully updated to the latest version available through the Mac App Store. You might want to read some our or OpenGL ES tutorials first.
You don’t need to be an OpenGL ES 2.0 expert to go through this tutorial, but it will help to at least know the basics. You’ll want to get familiar with Cocos2D if you aren’t already, perhaps by reading some of the Cocos2D tutorials on this site. If you are a complete beginner, you may wish to check out some of the other tutorials on this site first. To get the most out of this tutorial, you need at least some basic knowledge of: This is an advanced tutorial so has a number of prerequisites.
In this tutorial, you’ll learn how to create and use shaders with the help of Cocos2D. If you aren’t using shaders yet, you will be after reading this tutorial!Ĭocos2D is one of the best iOS game frameworks available at the moment, and fortunately for us, Cocos2D 2.X now supports OpenGL-ES 2.0 and shaders. They allow programmers to create completely new effects and take full control of what’s seen on the screen. Shaders may very well be the biggest step forward in computer graphics since the introduction of 3D into games. So if someone has a simple example of multi-texturing working with point sprites in OpenGL ES 2.Learn how to make cool effects like this with Cocos2D 2.0 shaders! My guess is that you CAN'T do multi-texturing on a point sprite and somehow having two active textures or two calls to gl_PointCoord causes a problem. That is, referring to the shader code above, whether I do However if I am using POINTS mode then I never see the second texture. pass in position and tex_coord attributes. This lets me do multi-texturing when I am in TRIANGLE or TRIANGLE_STRIP mode. Here's how I'm passing in the textures to my shader. If it is possible, a link to an example of working code would super helpful. I'm sure I am passing in the textures properly, as I can do multi-texturing just fine in TRIANGLE_STRIP mode, but I am hoping to speed things up using point sprites. Vec4 blurPixel = texture2D( blur_tex, gl_PointCoord ) Vec4 texPixel = texture2D( tex, gl_PointCoord )
Is there some built-in limitation where gl_PointCoord can't be used on multiple textures when using GL_POINTS mode for point sprites? uniform sampler2D tex I can't find any examples of this on web, and it doesn't seem to be working. I am trying to make a multi-textured point sprite for an iphone application using OpenGL ES 2.0.
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