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• Drawing bitmaps faster on Android canvas or OpenGL

  - by Ben Mc

  I currently have a game written using the Android canvas. It is completely 2D, and I draw bitmaps as sprites on the canvas, and it technically works, but I have a few features that I need to add that will require drawing many more bitmaps on the screen, and there will be a lot more movement. The app needs more power. What is the best way to go from this method of drawing Bitmaps on a canvas to using OpenGL so I can draw them faster?

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• Opengl: use a texture only to give alpha channel to a colored object

  - by Damian

  I'm new at OpenGL and I can't find out how to do this: I want to render a letter and be able to change it's color, so I have a texture with the letter on a transparent background. I managed to render it using this code: glEnable(GL_BLEND) glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) But that renders the letter in black, as it's on the texture. How can I render it with the color setted with glColor4f?

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• Using GLEW to use OpenGL extensions under Windows

  - by Ashwin

  I've been using OpenGL extensions on Windows the painful way. Is GLEW the easier way to go? How do I get started with it?

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• Stuttering animation in iPhone OpenGL ES although fps is high

  - by guymic

  I am building a 2d OpenGL es application For iPad it displays a background texture and numerous textures on top of it which are always in motion. Every frame their location is recalculated based on time delta and speed and the entire thing is being rendered at 60 fps successfully, but still as the movement speed of the sprites raises, thing look stuttering. Any ideas? Are there inherit problems with what I'm doing? Are there known design patterns for smooth animation?

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• OpenGL ES Highlighting Algorithm for the iPhone

  - by user280556

  Hey Everyone, I am trying to do a highlighting action on the iPhone. I can draw lines an such with the finger but now I want to be able to highlight over that. Any algorithms out there you can point me to that does that? Using OpenGL ES off course. Thanks

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• Gradients for polygons in OpenGL

  - by user146780

  what is the best way to create a gradient for a 2D polygon in OpenGL, (Linear, and Radial)? Thanks How can you generate textures for radial gradients on the fly?

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• iPhone OpenGL ES

  - by Chaoz

  Hello, Since I'm not familiar with iPhone development I'd like to know whether it is possible to use OpenGL ES1.0 on the iPhone 3gs rather than 2.0. I'd like to share a code base across different mobile platforms and not having to deal with the programmable pipeline from OGLES 2.0 could speed up an initial build. Thanks

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• iPhone - OpenGL using C++ tutorial/snippet

  - by ruibm

  Is there any good tutorial or code snippet out there on how to use OpenGL via C/C++ on the iPhone? Thanks!

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• Algorithm to zoom into mouse(OpenGL)

  - by user146780

  I have an OpenGL scene with a top left coordinate system. When I glScale it zooms in from (0,0) the top left. I want it to zoom in from the mouse's coordinate (reletive to the OGL frame). How is this done? Thanks

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• Windowless OpenGL

  - by ext

  Hi, I would like to have a windowless OpenGL context (on both GNU/linux with Xorg and Windows). I'm not going to render anything but only call functions like glGetString, glCompileShader and similar. I've done some goggling but not come up with anything useful, except creating a hidden window; which seems like a hack to me. So does anyone have a better idea (for any platform)?

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• C++ OpenGL Window Kit

  - by m00st

  Besides Qt, GTK, wxWidgets... What are the recommendations for a cross platform, open source GUI framework library that works with OpenGL?

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• To print a 3D string in OpenGL

  - by Nagaraj

  Hello can anyone please let me know a function for 3D printing in OpenGL. I had to print a string and was using glutBitmapCharacter() but this is not printing it. Thankx in advance. :)

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• Hidden features of OpenGL

  - by subSeven

  Hello! What are some of the hidden features of OpenGL and GLSL ? Do you know some cool tricks/tips ?

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• I need a 3ds loader for opengl

  - by Shaza

  Hey, I have an opengl project with C++, and I need to load like 10 3ds objects in my scene with their texture on, but unfortunatly the loader I'm using now is causing memory leakage, I knew that when my scene freezed after running the project by one min, so can you suggest a 3ds loader which can be very effective in loading a big number of 3ds objects??

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• OpenGL - GL_FRONT versus GL_FRONT_AND_BACK

  - by Drew Noakes

  I'm tinkering with an open source project that uses OpenGL for rendering in 3D. In the construction of the materials I see code like this: // set ambient material reflectance glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mAmbient); In other examples, this is used: glMaterialfv(GL_FRONT, GL_AMBIENT, mAmbient); So my question is, what is the difference here? Under what circumstances would it look different and, if my volume is enclosed with all normals pointing outwards, is there any performance difference?

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• c++ opengl: glOrtho() - please explain the usage of this command

  - by ufk

  Hiya. I started learning OpenGL and I can't understand the usage of glOrtho. can someone please explain what is it used for ? thanks

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• Opengl-es android best way to preload images

  - by lacas

  I have a game app, and i have many screens. The first screen will be the SCREEN.LOADING screen. When the app starting, I want to show a picture "loading please wait" while the images, menus, etc loaded succesfull. I tried asynctask to do this, but its not work in GLThread. What is the way to do this in opengl-es? 03-06 12:46:35.282: ERROR/AndroidRuntime(32736): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() Thanks, Leslie

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• OpenGL 2D editor ?

  - by Fevos

  I want to draw different 2D objects in OpenGL for example a path/Road ,is there any program i could draw them using a GUI then transfer them to points so i could use them in my program ?

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• openGL ES gpu thread on android devices

  - by Sponge

  does anyone know what part of the opengl es thread on an android device runs on the gpu (if it has one). just the method calls you make with the GL10 adapter class? or the complete onDraw method in your custom Renderer class?

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• Drawing connected lines with OpenGL

  - by user146780

  I'm drawing convex polygons with OpenGL. I then do the same thing but use GL_LINE_LOOP. The problem I have is the lines are not always connected. How could I ensure that the lines are always connected? In the photo below, Iv highlighted in green, the corners that are connected and in red, those that are not. I would like for them to be all like the green ones. http://img249.imageshack.us/i/notconnected.png/ Thanks

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• OpenGL constant don't exist

  - by subSeven

  Hello! I haven't got GL_GENERATE_MIPMAP_HINT, GL_GENERATE_MIPMAP constatns, why ? I have old version of opengl ? Where can I download new library version ?

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• OpenGL code to render ribbon diagrams for protein

  - by eipxen

  Hey all, I am looking to render ribbon diagrams of proteins using OpenGL and C++. Does anyone know if any open source code for this already exists, or if there are good guides to do this? If not, I'd prefer to figure it out myself ;) but I didn't want to reinvent the wheel, especially if the wheel was free.

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• Using OpenGL in a regular window (Win32)

  - by user146780

  I want to use OpenGL in my WndProc but I'm not sure how. I also don't want GL to occupy the whole screen, just a portion of the screen. In the end I basically want to make a drawing win32 app but use OGL instead of GDI. so how can I tell GL to use my control (a panel) 's hdc for drawing? Thanks

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• Programming language for opengl screenshot software

  - by mandril

  I need to develop a multiplatform software that takes screenshots from opengl games without affecting the game in performance, it will run in the background and will add a watermark to my screenshots. What language should i use? I thought of Perl / Python. Anyone can point me out something to start? Thanks!

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• Use OpenGL in C#

  - by danialtehrani

  How can I use OpenGL in C# , What shoul I do ? what I must download and how can I use it in my project?

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