Tagged Questions

4
votes
1answer
159 views

Android game loop's effect on cpu/battery usage - unexpected results

I will try to keep this question as concise and as readable as I can. I recently came across an odd problem with my Android game that I'm developing. It's an openGL ES 2.0 game and initially I was ...
1
vote
1answer
57 views

Centering GLViewport position within physical screen

I'm developing my app on one device and want it to display at the same ratio on all other devices. Currently what I have is 'image 1' in my image below - the game fits perfectly onto my development ...
1
vote
1answer
102 views

How would one render dynamic vertices in OpenGL ES 2.0 like in a 3D modeling program?

Is there an easy way to re-render dynamic vertices in OpenGL ES 2.0 so that one could, for example, make a modeling program? I understand how to make a dynamic vertex array, but what I don't ...
0
votes
3answers
100 views

Where to run logic update in openGL ES?

Using Canvas with Surfaceview I had a run() method where I would essentially do the following: onDraw(); update(); Where onDraw method would do the rendering and update would update all my game ...
-2
votes
1answer
110 views

Game code structure using openGL / Android [closed]

My game will have 3 activities (splashscreen, options menu and main game). As it stands, each is a separate activity with it's own activity class and GLSurfaceview class. Is this structure the right ...
0
votes
0answers
49 views

Strange problem with rendering quads in OpenGL ES 2.0 with custom classses on Android

I have 2 custom classes, one is for drawing quads (Quad) and the other is for drawing quads using VBO's (VBOQuad). If I create a simple quad and render it like so: Quad sprite = new Quad(); ...
1
vote
1answer
104 views

Separate renderng thread in Android (OpenGL ES 2.0)

I'm used to mainly working with the Canvas SurfaceView API on Android and have recently been learning openGL ES 2.0 With canvas I know that surfaceView gives you the ability to start a new thread to ...
1
vote
1answer
108 views

Powers of 2 textures in Android 2d games?

I've read a lot about the importance of using powers of 2 png's for textures when using OpenGL ES. However, how does this relate to Google's own documentation regarding the resizing of graphics for ...
0
votes
1answer
105 views

Drawing more that one quad with only one glDrawArray call…?

Edit After initially thinking that my sprite batch test was faster than calling each sprite individually, it appears that is not the case!! :-( With a single set of GL calls for a each sprite, I can ...
2
votes
2answers
175 views

Android: Loading bitmaps without premultiplied alpha (OpenGL ES 2.0)

Is this possible? To load textures in non-premultiplied format (Straight alpha?)? My game has 1 or 2 images which have semi-transparent pixels and I need to be able to fade them in and out but this ...
2
votes
0answers
138 views

How can I tell if OpenGL has finished rendering the current frame?

If I make a call to http://developer.android.com/reference/android/opengl/GLSurfaceView.html#requestRender() from my game loop, how can I tell when OpenGL has finished rendering? I don't want to ...
0
votes
1answer
96 views

Get back or delete an existing OpenGL object, then change it and draw at new. How?

With OpenGL i'm drawing for example a circle. Can i take this drawn circle back out of the window and change something and then draw it back on the window? Or can i /have to delete it and then draw ...
7
votes
2answers
309 views

What's the best way to draw lots of trees

I'm writing an app which renders a random island planted with trees. The trees are currently two quads, criss-crossed and drawn with textures. I plan to have more complex meshes that form different ...
1
vote
2answers
94 views

Why doesn't a line draw after instantiating it on a thread other than the renderer thread?

I'm making a 2D game with OpenGL ES 2.0 on Android, as an excuse to learn a bunch of things. I'm drawing many lines to make a grid, but setting everything up takes time and I'd like to render a ...
2
votes
0answers
134 views

Camera - View matrix in Android + openGLES 2

I am trying to use the touch screen on the tablet to control my camera movements and generate the view matrix accordingly. I get the x and y coordinates of the screen and after doing some sanity ...
0
votes
0answers
140 views

Converting motionevent.getx and motionevent.gety to pixel or Object coordinates in the view

I am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and ...
0
votes
1answer
180 views

All of my matrix functions not working? OpenGL ES 2.0

I am trying to make a projection matrix scaling the screen and making a coordination system. For some reason I don't think any of my matrix calling is working... the 3 function I am using are ...
1
vote
1answer
112 views

Horizontal scroll only part of the view

I would like to know the best way on how to implement horizontal scrolling to only part of the view and vertical scrolling to complete view. I was able to achieve horizontal and vertical scrolling to ...
0
votes
0answers
110 views

How to dispose of OpenGL resources cleanly on Android

I am creating a framework for OpenGL ES 2.0 for android and my question is how can I cleanly dispose of my OpenGL resources when my android app is done? I check for isFinished() in the onPause() ...
-1
votes
2answers
188 views

OpenGL 2.0 Android Scrolling Horizontally and Vertically

I am new to OpenGL2.0 in Android. How can I scroll the GLSurfaceView both horizontally and vertically?
0
votes
0answers
51 views

What could cause dispersed triangles instead of integral model?

So the thing is, I get dispersed triangles instead of model that I'm loading, in this case it's just a cube. It seems as those triangles have no points that connect them. Is there anyone who had this ...
5
votes
1answer
342 views

FBO rendering different result between Galaxy S2 and S3

I'm working on a pong game and have recently set up FBO rendering so that I can apply some post-processing shaders. This proceeds as so: Bind texture A to framebuffer Draw balls Bind texture B to ...
0
votes
1answer
151 views

Android, apply a pixelshader on a canvas

Can an opengl pixelshader be applied on a Canvas? I want to render a bitmap on a canvas, then apply a pixelshader to get, for example, a blur effect. Is this possible? I don't want to simulate the ...
1
vote
1answer
269 views

GLES2.0 3D Android game performance and multi threading the update?

I have profiled my mixed Java\C++ Android game and I got the following result: As you can see, the pink think is a C++ functions that updates the game. It does things like updating the logic but it ...
0
votes
1answer
287 views

Why do my 512x512 bitmaps look jaggy on Android OpenGL?

This is sort of driving me nuts, I've googled and googled and tried everything I can think of, but my sprites still look super blurry and super jaggy. Example: Here: ...
2
votes
2answers
150 views

how to render small texture on another texture?

can anybody help me to render small texture on another texture. i.e I have one background image, when user touches on the screen it should draw small(circle or any object) on it. can anybody suggest ...
3
votes
1answer
370 views

how to do sprinkle effect of water in opengl in android?

I want to achieve sprinkling effect of water in android using opengl. so, do i need to achieve it with graphics? is there any other way to do it using opengl? or how can i start working on this,any ...
1
vote
1answer
106 views

How to implement custom texture formats in Android?

What I know: Android can load PNG, BMP, WEBP,... via BitmapFactory. What I want to achive: Load my own 2D file format (e.g. 1-bit texture with a 1-bit alpha channel) and output a RGBA8888 texture. ...
4
votes
1answer
1k views

OpenGL ES 2.0 Best Practices / Architecture Guide

I've recently started working with OpenGL (ES 2.0) on the Android. While there is lots of documentation about the basics, I can't seem to find much about the overall architecture of OpenGL. In ...
0
votes
3answers
851 views

Using multiple sprite sheets for same object AndEnginge

I have multiple sprite sheets for my object(Parrot) like eating, moving left to right, right to left and much more. I am using AndEngine gles2.0. How should I implement it? Every time I have to use ...
2
votes
0answers
1k views

Best practice to use Sprites in a game using AndEngine GLES2

Currently I am having static reference to all my sprites and loading and initializing them in my OnCreateResource mthod of SimpleBaseGameActivity, But now I have to override onAreaTouched listener on ...
0
votes
3answers
3k views

2D Rendering with OpenGL ES 2.0 on Android (matrices not working)

So I'm trying to render two moving quads, each at different locations. My shaders are as simple as possible (vertices are only transformed by the modelview-projection matrix, there's only one color). ...
4
votes
1answer
418 views

OpenGL ES 2.0 texture distortion on large geometry

OpenGL ES 2.0 has serious precision issues with texture sampling - I've seen topics with a similar problem, but I haven't seen a real solution to this "distorted OpenGL ES 2.0 texture" problem yet. ...
1
vote
0answers
750 views

Move a 2D square on y-axis on Android GLES2

I am trying to create a simple game for Android. To start, I am trying to make the square move down the y-axis, but the way I am doing it, it doesn't move the square at all and I can't find any ...
1
vote
0answers
539 views

Touchscreen panning in OpenGL ES 2.0

I'm trying to allow the user to pan a 2D scene by using the touch screen. I have tried several methods including translating the projection matrix, translating the view matrix and haven't found ...
3
votes
1answer
202 views

Why did an Android update disable the textures in my game?

I recently updated my tablet to Android 4.0.3 and now the textures for my game do not show up. I'm using OpenGL-ES 2.0 for my engine. It worked fine when I was running android 3.0. Is there any ...
3
votes
1answer
4k views

OpenGL ES 2 on Android: native window

According to OGLES specification, we have the following definition: EGLSurface eglCreateWindowSurface(EGLDisplay display, EGLConfig config, ...
0
votes
1answer
861 views

Android device - C++ OpenGL 2: eglCreateWindowSurface invalid

I am trying to debug and run OGLES on Native C++ in my Android device in order to implement a native 3D game for mobile smart phones. The point is that I got an error and see no reason for that. Here ...
2
votes
2answers
424 views

In OpenGl ES 2, should I allocate multiple transformation matrices?

In OpenGl ES 2, should I declare just one transformation matrix, and share it across all objects or should I declare a transformation matrix in each object that needs it? for clarification... ...
0
votes
1answer
2k views

OpenGL ES 2.0 gluUnProject

I've spent more time than I should trying to get my ray picking program working. I'm pretty convinced my math is solid with respect to line plane intersection, but I believe the problem lies with the ...
2
votes
2answers
403 views

Horizontal wrapping with AndEngine

How would one implement the effect of a sprite disappearing on one side of the screen and appearing on the other using AndEngine? Like in Kid Icarus, seen here at around 1:22.
1
vote
1answer
515 views

Android opengles 2.0 :different resolutions rendering and input

I'm currently developing a sprite based 2D game for android using opengles 2.0. I've got some basic rendering done that mimics the spritebatch functionality of xna (draw sprite, rotation, color). But ...
3
votes
1answer
482 views

Integration of LibRocket and Android

I am using OpenGL ES 2.0 to create a 2D game for Android 2.2 and was planning on using LibRocket for the GUI. Does anyone have any links or knowledge they would share on how to integrate LibRocket ...
1
vote
1answer
717 views

Z rotation causing skew Android OpenGL ES 2.0

If I rotate about the X, or Y axis there is no skewing however for a pure 2D game that does not help me. When I try to rotate about the Z axis however the quad I am rendering for the sprite starts to ...
1
vote
3answers
790 views

How can I draw crisp per-pixel images with OpenGL ES on Android?

I have made many Android applications and games in Java before, however I am very new to OpenGL ES. Using guides online, I have made simple things in OpenGL ES, including a simple triangle and a cube. ...
0
votes
2answers
1k views

Recreating assets after onResume()

After onPause is called for the GLSurfaceView the rendering surface is destroyed, along with all the textures, shaders and the like. On onResume() should the surface not be recreated and GLRenderer ...
3
votes
2answers
948 views

What is causing these visual artifacts on my OpenGL sprites?

What could be the cause of the defects in my characters sprite? I am using OpenGL ES 2.0. I draw my sprites in a sprite batch that uses UV coordinates from one large texture atlas. If you look around ...
1
vote
1answer
512 views

Open GL ES 2.0 Android Texture,Shader, etc… loading

I have gotten texture's to load along with shader's however it seems that I can only create shaders and textures in onSurfaceCreated in my implementation of the render interface. Is this truly the ...
1
vote
4answers
465 views

How can I support scrolling when using batched rendering for my tiles?

I have tiled map 100*75 and tiles are 32*32 pixel.I want to use batching for performance .I don't figure it out , because of my game needs scrolling and every frame i draw 22*16 tiles (my screen is ...
12
votes
3answers
4k views

Is deferred rendering/shading possible with OpenGL ES 2.0 ?

I asked this on StackOverflow, but it might make more sense here: Has anyone implemented deferred rendering/shading under OpenGL ES 2.0? It doesn't support MRTs, so with only one color buffer, it's ...