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------------------------------------------------------------------------
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San Angeles Observation OpenGL ES version example
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Copyright 2004-2005 Jetro Lauha
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Web: http://iki.fi/jetro/
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See file license.txt for licensing information.
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------------------------------------------------------------------------
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This is an OpenGL ES port of the small self-running demonstration
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called "San Angeles Observation", which was first presented in the
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Assembly'2004 event. It won the first place in the 4 KB intro
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competition category.
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The demonstration features a sightseeing of a futuristic city
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having many different kind of buildings and items. Everything is
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flat shaded with three different lights.
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The original version was made for desktop with OpenGL. It was
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naturally heavily size optimized in order to fit it in the size
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limit. For this OpenGL ES version example much of the code is
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cleaned up and the sound is removed. Also detail level is lowered,
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although it still contains over 60000 faces.
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The Win32 (2000/XP) binary package of original version is
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available from this address: http://jet.ro/files/angeles.zip
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First version of this OpenGL ES port was submitted to the Khronos
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OpenGL ES Coding Challenge held in 2004-2005.
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As a code example, this source shows the following:
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* How to create a minimal and portable ad hoc framework
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for small testing/demonstration programs. This framework
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compiles for both desktop and PocketPC Win32 environment,
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and a separate source is included for Linux with X11.
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* How to dynamically find and use the OpenGL ES DLL or
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shared object, so that the library is not needed at
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the compile/link stage.
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* How to use the basic features of OpenGL ES 1.0/1.1
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Common Lite, such as vertex arrays, color arrays and
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lighting.
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* How to create a self contained small demonstration
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application with objects generated using procedural
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algorithms.
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As the original version was optimized for size instead of
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performance, that holds true for this OpenGL ES version as
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well. Thus the performance could be significantly increased,
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for example by changing the code to use glDrawElements
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instead of glDrawArrays. The code uses only OpenGL ES 1.0
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Common Lite -level function calls without any extensions.
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The reference OpenGL ES implementations used for this application:
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* Hybrid's OpenGL ES API Implementation (Gerbera) version 2.0.4
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Prebuilt Win32 PC executable: SanOGLES-Gerbera.exe
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* PowerVR MBX SDK, OpenGL ES Windows PC Emulation version 1.04.14.0170
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Prebuilt Win32 PC executable: SanOGLES-PVRSDK.exe
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Note that DISABLE_IMPORTGL preprocessor macro can be used
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to specify not to use dynamic runtime binding of the library.
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You also need to define preprocessor macro PVRSDK to compile
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the source with PowerVR OpenGL ES SDK.
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The demo application is briefly tested with a few other OpenGL ES
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implementations as well (e.g. Vincent, GLESonGL on Linux, Dell
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Axim X50v). Most of these other implementations rendered the demo
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erroneously in some aspect. This may indicate that the demo source
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could still have some work to do with compatibility and correct
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API usage, although the non-conforming implementations are most
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probably unfinished as well.
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Thanks and Acknowledgements:
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* Toni L<>nnberg (!Cube) created the music for original version, which
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is not featured in this OpenGL ES port.
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* Sara Kapli (st Rana) for additional camera work.
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* Paul Bourke for information about the supershapes.
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------------------------------------------------------------------------
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