Beginning GLSL - Quick Question

David McGrane · 2014-06-08T23:45:33

Hi, I have begun delving into the latest OpenGL, and am hoping someone can just answer some basic questions for me. I'm currently working on a 2d game, I have set up my shaders, and all is well. I have my map loading and rendering correctly to the screen, and even have the view matrix set up to scroll the map. All is good :) My map is currently loaded from a basic text file, the coords and colours are calculated, and are stored in a 1D array contiguously. What I now want to do is add a basic character, this is where I got confused. I add the the tile for this character - But am unsure of how I should go about moving him independently to the rest of the map. Should I just update the positions on the array, and then send the whole array to be drawn again? - Or do I set up a second shader program, and run them independently ? Or maybe is there a way to just update certain index of the array loaded in the GPU? I use uniforms to update the matrices and such in the shaders, but really don't know how id update just one tile out of 4000/whatever. I have not added any code, as I dont think its really relevant - but easily can if needed. Im sure there is any easy answer for this, im just hoping someone can point me in the right direction - to save me wondering around google aimlessly :) Thanks for your time! David.

For Beginners

Started by McGrane June 05, 2014 09:39 PM

10 comments, last by Arjan B 9 years, 10 months ago

McGrane

1,745

Author

June 08, 2014 08:57 PM

All right, I understand enough now, and have taken up enough time ;) I had assumed to send them to the GPU was the way to go for speed, and had avoided doing any calculations on the CPU, I see now that it should not be solely done by either. And that most my problems are stemming from assumptions :P

I have enough information now, and have a working example, that I can now further my reading into everything matrix related, and modern opengl related. Its just demotivating if you cant get something simple to go correctly

Thanks for the help, its greatly appreciated

Regards

David

Arjan B

1,137

June 08, 2014 11:45 PM

Good luck! This online book helped me greatly: http://www.arcsynthesis.org/gltut/index.html

Beginning GLSL - Quick Question

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