ReadMe.txt
GLTextureAtlas |
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DESCRIPTION: |
This sample demonstrates how to use a texture atlas to draw multiple objects with different textures simultaneously using OpenGL ES. |
It shows how to: |
* create PVR textures in an Xcode project build phase using texturetool; |
* load a PVR texture and display it using OpenGL ES; |
* create interleaved (tightly packed) vertex array; |
* join triangle strips together by adding in degenerated triangles; |
* compute 3D transformations using matrices and homogeneous coordinates (x,y,z,1). |
This sample also uses some unrelated techniques, including random number generators, and depth-sorted blended particle system. |
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BUILD REQUIREMENTS: |
iOS 5.0 SDK |
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RUNTIME REQUIREMENTS: |
iOS 5.0 or later |
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PACKAGING LIST: |
PVRTexture.h |
PVRTexture.m |
The PVRTexture class is responsible for loading .pvr files generated by texturetool. |
GLTextureAtlasViewController.h |
GLTextureAtlasViewController.m |
The GLTextureAtlasViewController class is a GLKViewController subclass that renders OpenGL scene. It demonstrates how to bind a texture atlas once, and draw multiple objects with different textures using one draw call. |
GLTextureAtlasAppDelegate.h |
GLTextureAtlasAppDelegate.m |
The GLTextureAtlasAppDelegate class is the app delegate that ties everything together. |
butterfly_2.pvr |
butterfly_4.pvr |
These are the pvr files generated from the butterfly.png image by the "Run Script" build phase. |
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CHANGES FROM PREVIOUS VERSIONS: |
Version 1.6 |
Updated with GLKViewController and GLKMatrix. Updated for 64 bit. |
Version 1.5 |
Changed deployment target back to iPhone OS 3.2 and added CFBundleIconFiles in Info.plist. |
Version 1.4 |
Upgraded project to build with the iOS 4 SDK. |
Version 1.3 |
Fixed a bug when running in the simulator. |
Version 1.2 |
Modified the script so that it works regardless where texturetool is installed. |
Version 1.1 |
Updated for iPhone OS 3.1. Use CADisplayLink as the preferred method for controlling animation timing, and fall back to NSTimer when running on a pre 3.1 device where CADisplayLink is not available. |
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