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  Opengl es 2.x - Some problems :)  (Read 3344 times)
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Offline Phibedy

Senior Duke


Medals: 9



« Posted 2012-12-24 20:55:11 »

Hi, it's for an android app, but I think it's a general question about shaders.
I wanna use 2.0,
1. therefore I can't use methods like glbegin?
2.In addition there's no drawPolygon function anymore?
3. Should I use a list of triangles or the triangle_fan?
4. How do I attach the api (http://www.khronos.org/opengles/sdk/docs/man/) to my project?
5. Should I use libgdx or the "android version"?
thx for help Smiley
best regards and Merry Christmas  Smiley
Offline davedes
« Reply #1 - Posted 2012-12-24 23:01:57 »

1. Nope.
2. There never was a drawPolygon method. You can still draw convex polygons with GL_TRIANGLES, as per usual, for concave polygons you can either use GLU tessellation or triangulate it in software (the preferred technique).
3. Depends on the situation. For example, making a 2D circle would be better with GL_TRIANGLE_FAN. For a rectangular sprite you may use GL_TRIANGLE_STRIP, or GL_TRIANGLES for a generic sprite renderer.
4. You access OpenGL through the Android APIs: see here
5. LibGDX includes a lot of features (like texture packing, frame buffer, shader program, matrices, etc) which you will inevitably need to work in the programmable pipeline. It makes more sense, especially for a beginner, to use LibGDX instead of reinventing the wheel.

I have more info on shaders, frame buffers, sprite batchers, etc in this series:
https://github.com/mattdesl/lwjgl-basics/wiki

Each shader lesson includes a port to LibGDX code, which should be useful for Android programmers.

Offline Phibedy

Senior Duke


Medals: 9



« Reply #2 - Posted 2012-12-26 16:34:23 »

thx  Smiley
I won't call myself an android programmer, I am just a try and error commander on his way to success  Grin
best regards
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Offline gouessej
« Reply #3 - Posted 2012-12-26 16:36:27 »

Hi, it's for an android app, but I think it's a general question about shaders.
I wanna use 2.0,
1. therefore I can't use methods like glbegin?
You can use com.jogamp.opengl.util.ImmModeSink with JOGL 2.0 under Android but it should be a temporary solution, rather switch to vertex arrays and VBO.

Offline Phibedy

Senior Duke


Medals: 9



« Reply #4 - Posted 2012-12-26 18:47:23 »

Using vertex-arrays etc isn't that hard, it's just a little bit anoying, that there are so much outdated tuts on the web and as a beginner u always notice it on the end   Roll Eyes
I am setting up Libgdx and have got a little problem:
http://code.google.com/p/libgdx/wiki/ProjectSetupNew : step 3.4, there's no "Finish" button there's only "configure buildpath" and "rename"
best regards
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